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Pulse Width Modulation patents



      

This page is updated frequently with new Pulse Width Modulation-related patent applications.




Date/App# patent app List of recent Pulse Width Modulation-related patents
06/23/16
20160181957 
 Brushless direct current motor and driving apparatus thereof patent thumbnailnew patent Brushless direct current motor and driving apparatus thereof
The present invention relates to driving apparatus for a brushless direct current motor, comprising: at least three half-bridge circuits, each having two switches connected in series and being configured to supply a voltage to a terminal of a rotor coil; a zero crossing detection module configured to detect whether the rotor coils experience bemf zero crossing and provide a control module with an indication signal that indicates whether the rotor coils experience bemf zero crossing, based on a type of the brushless direct current motor; and a control module configured to transmit to the zero crossing detection module information regarding the type of the brushless direct current motor, and generate and output, based on the indication signal, pulse width modulation signals to control the switches of the half-bridge circuits. The driving apparatus may drive a plurality of types of brushless direct current motors..

06/23/16
20160181798 
 Bidirectional electrical signal converter patent thumbnailnew patent Bidirectional electrical signal converter
A bidirectional ac-to-dc and dc-to-ac circuit includes a first inductor-capacitor (lc) circuit connected to an ac power source, a transistor synchronized with the ac power source signal, a second lc circuit electrically connected to the synchronized transistor and the first inductor-capacitor circuit, a high-frequency switching transistor electrically connected to the second inductor-capacitor circuit and a direct current (dc) load, and a controller connected to the high-frequency switching transistor. The controller identifies an error between a measured dc output signal and a predetermined dc output signal that is applied to the dc load, and adjusts a duty cycle of a pulse width modulation (pwm) switching signal for the high-frequency transistor to reduce the identified error..

06/23/16
20160181795 
 Driving circuit and driving method applied to display system and associated display system patent thumbnailnew patent Driving circuit and driving method applied to display system and associated display system
A driving circuit applied in a display system includes a node, a current control circuit, a protecting circuit and a timing controller, wherein the node is arranged to connect to a lighting element; the current control circuit is coupled to the node and arranged to selectively provide a current to the lighting element according to a pulse width modulation (pwm) signal; the protecting circuit is coupled to the node and arranged to be selectively enabled to limit the voltage of the node according to a control signal to make the voltage of the node maintain a predetermined voltage, wherein the lighting element does not have any current passed through when the voltage of the node maintains the predetermined voltage; and the timing controller is arranged to generate the pwm signal and the control signal.. .

06/23/16
20160180202 
 Image forming apparatus patent thumbnailnew patent Image forming apparatus
Disclosed is an image forming apparatus, including: n laser elements arranged in the sub-scanning direction and configured to simultaneously scan an image; a pixel selection unit configured to execute a thinning process in which the pixels are thinned by selecting m pixels among n pixels arranged in the sub-scanning direction, by changing positions of the pixels to be selected according to positions in the main scanning direction; a pulse width modulation processing unit configured to sequentially convert image data corresponding to the m pixels into m pulse width modulation signals; a transmission unit configured to transmit the m pulse width modulation signals in parallel; an assignment unit configured to assign the m pulse width modulation signals to m laser elements corresponding to the positions of the m pixels; and a driving unit configured to drive the laser elements in accordance with the assigned pulse width modulation signals.. .

06/16/16
20160173839 
 Projector patent thumbnailProjector
A projector includes a light source unit that supplies light, and a spatial light modulator that modulates light supplied from the light source unit according to an image signal. The spatial light modulator is driven by an applied voltage whose polarity is reversed according to a polarity-reversing frequency which is specific to the spatial light modulator.
Seiko Epson Corporation


06/16/16
20160173004 
 Space vector pulse modulation based motor driver patent thumbnailSpace vector pulse modulation based motor driver
A motor driver may include a controller, a space vector modulator, a converter and a detector. The space vector modulator may generate driving signals under control of the controller according to a space vector pulse width modulation (“svpwm”) scheme.
Analog Devices, Inc.


06/16/16
20160172978 
 Switching power source apparatus patent thumbnailSwitching power source apparatus
A switching power source apparatus includes: a switching output circuit that generates an output voltage from an input voltage; an error amplifier that generates an error voltage in accordance with a difference between a predetermined reference voltage and the output voltage or a feedback voltage corresponding to the output voltage; a clock signal generation circuit that generates a clock signal; a slope voltage generation circuit that receives the clock signal to generate a slope voltage; a delay circuit that delays the clock signal to generate an on-signal; a pwm comparator that compares the error voltage and the slope voltage with each other to generate an off-signal; a logic circuit that receives the on-signal and off-signal to generate a pulse width modulation signal; and a switch drive circuit that receives the pulse width modulation signal to generate a drive signal for the switching output circuit.. .
Rohm Co., Ltd.


06/16/16
20160172972 
 Voltage adjusting apparatus patent thumbnailVoltage adjusting apparatus
A voltage adjusting apparatus includes a pulse width modulation (pwm) controller, a switch module, and a feedback module. The pwm controller outputs control signals.
Hon Hai Precision Industry Co., Ltd.


06/16/16
20160172971 
 Circuitry and  regulating a current for an electromechanical load patent thumbnailCircuitry and regulating a current for an electromechanical load
A circuitry for regulating a current for an electromechanical load comprises a first connection and a second connection for the electromechanical load. The first connection can be coupled to a first supply potential thereby, and a potential of the second connection can be modified by means of a pulse width modulation.
Zf Friedrichshafen Ag


06/16/16
20160172877 
 Optimal battery current waveform for bidirectional phev battery charger patent thumbnailOptimal battery current waveform for bidirectional phev battery charger
The present invention provides a battery charger and battery charging method controlled with a charging waveform input of an ac-dc switching circuit to a dc link and a dc-dc stage converter for outputting a regulated dc voltage. The method determining the charging waveform comprising the steps of selecting a pulse width modulation (pwm) zero-off charging waveform signal input to the ac-dc switching circuit and calculating a ripple power at the dc link based on the signal input power and output power of the regulated dc voltage output..

06/16/16
20160167538 

Method and charging system for selecting charging mode of electric vehicle


A method and charging system for effectively performing measurement of a pulse width modulation (pwm) signal for selection of a charging mode between an electric vehicle and a charger are disclosed. The method for determining a charging mode of an electric vehicle includes measuring a duty ratio of a control signal applied to a communication line of a charger connector by a first controller for controlling slow charging and a second controller for controlling quick charging, transmitting measurement results obtained from each of the first and second controllers to a third controller in charge of a battery, determining a final duty ratio using the measurement results by the third controller, transmitting the determined final duty ratio to the first controller and the second controller, and starting charging in a mode corresponding to the final duty ratio..
Yura Corporation Co., Ltd.


05/26/16
20160150620 

Visible and nonvisible light bulb driver and system


An electronic lighting system with a driver for providing light from visible light bulbs and non-visible light bulbs, including from infrared, ultraviolet, led and fluorescent lamps of multiple sizes and wattages, having power factor correction, surge protection, current sensing, current adjustment feedback, and dimming system. There are transformers dedicated to particular lamp receptacles that include interloper diodes and resistor sets that fine tune the functioning of the driver sensing loads.

05/26/16
20160149733 

Control architecture for devices in an rf environment


A system includes a processing device to generate a command, the command having a first format that is transmissible over a conductive communication link. The system further includes a first converter, coupled to the processing device, to receive the command and convert the command into a second format that is transmissible over a non-conductive communication link.
Applied Materials, Inc.


05/26/16
20160149561 

Super high voltage device and operating a super high voltage device


A super high voltage device includes a first gate, a second gate, a drain, a first source, a second source, and a third source. The first gate is used for receiving a first control signal generated from a pulse width modulation controller.
Leadtrend Technology Corp.


05/26/16
20160149533 

Detection of a wire-break fault during the operation of a brushless d.c. motor


A method recognizes a wire-break fault during operation of a brushless dc motor. A switch-on delay duration of a transition of an electrical phase potential that rests on the stator winding phase from a switch-off potential to a switch-on potential and a switch-off delay duration of the transition of the phase potential from the switch-on potential to the switch-off potential are detected for a stator winding phase of the stator winding of the motor during each pulse width modulation cycle period.
Conti Temic Microelectronic Gmbh


05/26/16
20160149529 

Generator excitation regulation using pulse width modulation


A system may be configured to provide a regulated generator field current to a generator to acquire a regulated output voltage of the generator. In one example, the system comprises a controller configured to provide an actuator control signal on the basis of an error signal, an actuator configured to provide on the basis of the actuator control signal a pulse-width modulated output voltage that is configured to drive the regulated generator field current into the generator, the pulse-width modulated output signal having a duty cycle controlled by the actuator control signal, and an error evaluator configured to provide the error signal based on a combination of a first deviation signal and a second deviation signal..
Infineon Technologies Ag


05/19/16
20160142007 

Photovoltaic inverter


The present invention relates to a photovoltaic inverter capable of reducing a leakage current and a switching loss by changing a pulse width modulation (pwm) method and a configuration of an output filter. To this end, the photovoltaic inverter includes a direct-current (dc) link capacitor connected in parallel to a photovoltaic module, a switch unit including first to fourth switches and operating by a half unipolar switching method, and a reactor having one end connected to another end of the first switch and one end of the second switch, and another end connected to a grid, the reactor having a predetermined inductance..
Lsis Co., Ltd.


05/19/16
20160141977 

Seven-level inverter apparatus


It is composed of a three-phase three-level inverter 1, three single-phase five-level inverters 2, each of which is connected in series with an output of each phase of the three-phase three-level inverter 1, and pulse width modulation control means 8 provided for each phase which supplies gate pulses to the three-level inverter 1 and the single-phase five-level inverter 2 of the relevant phase. State transition means 84 which determines an output of a switching leg of the three-level inverter 1, and outputs of outside and inside switching legs of the single-phase five-level inverter based on transition of a voltage level created by the pulse width modulation control means 8, makes all of the three outputs of the three-level inverter 1, and the outside and inside switching legs of the single-phase five-level inverter 20 or positive, when the voltage level is positive, makes all of the outputs of these three legs 0 or negative, when the voltage level is negative, and makes all of the outputs of these three legs 0, when the voltage level is 0..
Toshiba Mitsubishi-electric Industrial Systems Cor Poration


05/19/16
20160141957 

Output current monitor circuit for switching regulator


A circuit and method for providing switching regulation with an improved current monitor comprising a pulse width modulation (pwm) controller configured to provide an output signal voltage, an output stage configured to provide switching comprising a first and second transistor, and first inverter, a sense circuit configured to provide signal sensing from said output stage, a sampling switch circuit configured to provide sample signals from said sense circuit, a differential integrator circuit configured to provide sample signals from said sampling switch circuit, a comparator configured to provide signals from said integrator circuit, a control logic circuit configured to provide signals from said comparator, a current digital-to-analog converter (dac) configured to provide feedback signal from said control logic circuit, and, a digital filter configured to provide output current information.. .
Dialog Semiconductor (uk) Limited


05/12/16
20160134269 

I/o module


An input/output (i/o) module is configured to connect a controller and a field device. The i/o module includes a pwm (pulse width modulation) demodulator configured to demodulate a pwm signal that is input from the controller, a current source configured to output a current based on an output signal of the pwm demodulator to the field device, a resistance connected in line with the current source, and a feedback circuit configured to feed back an output current of the current source to the pwm demodulator via the controller..
Yokogawa Electric Corporation


05/12/16
20160134239 

Class d power driver peripheral


A class d peripheral is integrated with a microcontroller as a general purpose driver for providing many different class d power applications such as motor and solenoid control, audio amplification, etc. Use of a simple triangle waveform (saw tooth) oscillator normally used for detecting changes in capacitance values in combination with a voltage comparator provides inexpensive generation of pulse width modulation (pwm) suitable for a wide range of class d power applications.
Microchip Technology Incorporated


05/12/16
20160131248 

Control unit of automatic transmission


An electronic control unit that is used in an automatic transmission to regulate oil circulation. The electronic control unit includes a switcher that supplies an electric current to a linear solenoid, a current detector that detects an actual electric current value of the solenoid, a target current calculator that calculates a target electric current value, a feedback controller that sets a duty ratio to match the actual electric current value to the target electric current value and to generate a pulse width modulation (pwm) signal having the set duty ratio, and a corrector that determines whether a coupled oscillation has occurred by obtaining oil pressure information of the hydraulic circuit and to correct the pwm signal when determining that the vibration has occurred..
Denso Corporation


05/12/16
20160129446 

Microfluidic devices with integrated resistive heater electrodes including controlling and measuring the temperatures of such heater electrodes


The invention relates to methods and devices for control of an integrated thin-film device with a plurality of microfluidic channels. In one aspect, the present invention provides a method for controlling the temperature of a heater electrode associated with a microfluidic channel of a microfluidic device, wherein power applied to the heater electrode is regulated by varying the duty cycle of a pulse width modulation (pwm).
Canon U.s. Life Sciences, Inc.


05/05/16
20160126907 

Amplifier control apparatus


An apparatus for controlling a pulse width modulation (pwm) amplifier is disclosed. In one aspect, the apparatus includes a delay circuit configured to delay an input signal and provide the delayed input signal to the pwm amplifier.
Ksc Industries Incorporated


05/05/16
20160126842 

Switching power supply


A switching power supply includes: a switching output circuit generating an output voltage from an input voltage according to on/off control of an output transistor by a pulse width modulation (pwm) signal; a first voltage generating circuit generating a first voltage based on a difference between the output voltage and a predetermined reference voltage; a second voltage generating circuit generating a triangular second voltage; a comparing circuit generating a comparison signal by comparing the first voltage and the second voltage; a clock oscillating circuit generating a clock signal; and a logic circuit generating a pwm signal in response to the clock signal and the comparison signal, wherein the second voltage generating circuit generates the second voltage by adding a first slope voltage having a first slope and a second slope voltage having a second slope according to current flown through the switching output circuit.. .
Rohm Co., Ltd.


05/05/16
20160126836 

Multi-mode controlled power converter


A switched power converter includes a switchable power stage for generating an output voltage according to a switching signal and an input voltage via a switching element. The switching signal is generated by a multi-mode controller.
Zentrum Mikroelektronik Dresden Ag


04/28/16
20160119994 

Solid state light source device and dimming circuit thereof


A solid state light source device and a dimming circuit are provided. The dimming circuit includes a rectifier circuit, a switch unit, and a control unit.
Lextar Electronics Corporation


04/28/16
20160119168 

Communicating through physical vibration


A data transmitter includes a vibration motor and a switch to regulate voltage from a direct-current (dc) power supply to the vibration motor. A microcontroller generates a pulse width modulation signal with which to drive the switch and regulate the voltage to the vibration motor in a sinusoidal manner, to generate data as symbols from vibrations that form a series of bits from the vibration motor.
The Board Of Trustees Of The University Of Illinois


04/28/16
20160118967 

Pulse width modulator for high speed digitally controlled voltage regulator


Described is a pulse width modulation architecture for high speed digitally controlled voltage regulator. Described is an apparatus which comprises: a first phase interpolator (pi) for coupling an input to a delay element of a delay line, wherein the coupling is via a selection unit; a second pi for coupling an output of the delay element of the delay line, wherein the coupling is via the selection unit; and a third pi for providing an output, the third pi calibrated according to delay settings of the first and second pis..
Intel Corporation


04/28/16
20160118949 

Amplifier with adjustable ramp up/down gain for minimizing or eliminating pop noise


A variable ramp up/down gain in a pre-power stage block of an audio amplifier may be used to reduce audible pops and clicks output by the audio amplifier. A controller may adjust the variable ramp up/down gain during operation of the audio amplifier.
Cirrus Logic, Inc.


04/28/16
20160118925 

Driving system for hybrid electric vehicles and controlling phase of pulse width modulation carrier signal in the same


Provided is a driving system for hybrid electric vehicles. The driving system includes a dc/dc converter configured to convert low-voltage dc power of a vehicle battery into high-voltage dc power according to a first pwm signal generated based on a first pwm carrier signal, a first inverter configured to convert the high-voltage dc power into first ac power according to a second pwm signal generated based on a second pwm carrier signal, and drive a first driving motor, which operates in one mode of a motoring mode for driving a vehicle and a regenerative mode for collecting kinetic energy of the vehicle as electric energy, according to the first ac power, a second inverter configured to convert the high-voltage dc power into second ac power according to a third pwm signal generated based on a third pwm carrier signal, and drive a second driving motor, which operates in one mode of the motoring mode and the regenerative mode, according to the second ac power, and a pwm phase controller configured to separately control phases of the first to third pwm carrier signals according to an operation mode of each of the first and second driving motors..
Hyundai Mobis Co., Ltd.


04/28/16
20160118917 

Control for pulse width modulated driven motors


A method for assisting in operating a pwm driven motor comprising for at least one phase of the pwm driven motor: generating a pulse width modulated phase voltage scheme according to a desired phase profile with a base scaling factor, by time multiplexing a first pulse and at least a further pulse within a pulse width modulation period of the phase the first pulse having a pulse width according to a first profile, for that rotor position, multiplied with a first scaling factor, the first profile being in phase with the desired phase profile, and the at least a further pulse having a pulse width corresponds with a further profile, for that rotor position, multiplied with a further scaling factor, the further profile being not in phase with the desired phase profile, whereby the first pulse and the at least one further pulse are positioned within the pulse width modulation period of the phase in at least partially non-overlapping way.. .
Melexis Technologies Nv


04/28/16
20160118898 

Power supply apparatus with auxiliary winding switching circuit


A power supply apparatus includes a main converter, an auxiliary winding switching circuit and a pulse width modulation controller. The main converter includes a transformer.
Chicony Power Technology Co., Ltd.


04/21/16
20160113084 

Digital control low output dimming of light emitting diode (led) drivers


A method for mitigating visual fluctuation of light output at low pulse width modulation levels is disclosed. The method comprises at least the step of comparing the percent change of a previously applied input voltage value to the pulse width modulation output..

04/21/16
20160111973 

Method and device for controlling an inverter


The invention relates to a method for controlling an inverter (10) using space-vector pulse width modulation, in particular to control an electric machine, the inverter being equipped with a plurality of controllable switches (s) and being designed to provide a polyphase electric current (iu, iv, iv), in particular to supply polyphase electric current (iu, iv, iv) to the electric machine (14). In said method, a desired current space vector (i1*) having a desired phase angle (alpha1) and a desired amplitude (i1) is predefined, and the inverter (10) is controlled in such a way that a plurality of different successive switching states (v1-v7) is established for the switches (s) in order to provide the electric current (iu, iv, iv) in the form of a current space vector (i2*), the inverter (10) being controlled in such a way that the current space vector (i2*) is provided at a phase angle (alpha2) which differs from the desired phase angle (alpha1), the difference (delta_beta) of the phase angle (alpha2) from the desired phase angle (alpha1) being limited according to a rotational speed (f) of the desired current space-vector (i1*)..

04/21/16
20160111881 

Power supply system


A power supply system includes: a first battery; a second battery; a voltage converter including a plurality of switching elements; and a controller configured to turn on or off the plurality of switching elements in accordance with pulse width modulation control. The controller is configured to control phases of the pulse width modulation control signals such that the first high-level period of the first pulse width modulation control signal and the second high-level period of the second pulse width modulation control signal do not overlap with each other at a predetermined condition..

04/21/16
20160111144 

Pulse width modulation device


A pulse width modulation device for use in an n-ports random access memory having a plurality of word line sets, wherein a specified word line set comprises n port word lines. The pulse width modulation device comprises a status detecting device and a clock signal generator.

04/21/16
20160109532 

Set/reset circuit and magnetic sensing device using the same


A set/reset circuit used with a magnetoresistive sensor includes a coil, four switch units, a capacitor and a control unit. The four switch units are electrically coupled between a power supply voltage (or a reference voltage) and the coil and have variable resistances.

04/21/16
20160109488 

Measuring output current in a buck smps


A sample and hold circuit takes a sample of the current flowing through an inductor of a buck switched-mode power supply (smps) at substantially the middle of the low side portion (50 percent point during low side switch on) of the pulse width modulation (pwm) period. This sample of the current through the smps inductor during the low side on 50% point may be considered as the “average” or “dc output” current of the smps, and taken every time at precisely the same low side on 50%.

04/14/16
20160105939 

Dimmable led lighting apparatus


A dimmable led lighting apparatus including a power input unit generating drive voltage through rectification of received ac power and outputting the generated drive voltage to the drive controller, an insulation type signal transceiver receiving a pulse width modulation (pwm) signal output from a pwm dimmer and outputting the pwm signal to the drive controller, while electrically insulating the pwm dimmer from the drive controller, a first led group to an nth led group, n being a positive integer of 2 or greater, receiving the drive voltage and sequentially operating under control of the drive controller, and a drive controller controlling sequential operation of the first led group to the nth led group according to a voltage level of the drive voltage, determining a dimming level based on the received pwm dimming signal, and controlling dimming of the first led group to the nth led group based on the determined dimming level.. .

04/14/16
20160105108 

Method and a buck converter with pulse width modulation and pulse frequency modulation mode


A buck converter device with minimum off-time operation, the device comprising a comparator providing an output signal of a minimum off time, a first amplifier, a p-channel mosfet whose gate is connected to the output of a first amplifier providing a signal threshold voltage to a positive terminal of a comparator, a second amplifier; and, a second p-channel mosfet whose gate is connected to the output of a second amplifier providing a signal to a negative terminal of a comparator, and a capacitor element. A capacitor establishes a voltage whose rate of change is proportional to power supply vdd, establishing a time to charge the capacitor to a threshold voltage proportional to (vdd-vref)/vdd, and establishing a minimum off time on the output of a comparator..

04/14/16
20160105107 

Apparatus and pulse width modulation with feedback control


According to one embodiment an apparatus of pulse width modulation with feedback control, adapted to drive an external load, the apparatus comprising a pulse width modulator, an adjustment encoder, a power driver, and a controller, wherein the pulse width modulator transfers a pulse code modulation code into a pulse width modulation code, the adjustment encoder transfers the pulse width modulation code into an upper-driven signal and a lower-driven signal, the power driver receives the upper-driven signal and the lower-driven signal to drive the external load, the controller measures the voltage of the external load to generate a control signal according to the upper-driven signal and the lower-driven signal, and transmits the control signal to the adjustment encoder to adjust the upper-driven signal and the lower-driven signal.. .

04/14/16
20160105102 

Method and operating a switchmode power supply


A method and apparatus operate a switchmode power supply. The apparatus can include a pulse width modulation controller that can produce a first pulse width modulation signal at a first frequency.

04/14/16
20160103463 

Switching converter to operate in pulse width modulation mode or pulse skipping mode


An electronic device may include a switching converter configured to convert an input voltage to an output voltage, and being selectively operable in a pulse skipping mode based upon a control signal. The switching converter may include a comparator having a first input configured to receive an error signal, a second input configured to receive a skipping mode reference signal, and an output configured to generate the control signal.

04/14/16
20160101702 

Power supply system


A power supply system includes: a first voltage converter configured to bidirectionally convert voltage between a first battery and an output line in accordance with first pulse width modulation control; a second voltage converter connected to the output line in parallel with the first voltage converter, the second voltage converter being configured to bidirectionally convert voltage between a second battery and the output line in accordance with second pulse width modulation control; and a controller configured to control the first and second voltage converters by generating first and second pulse width modulation control signals, the controller being configured to, when one or both of temperatures of the first and second batteries are lower than a predetermined temperature, change phases of the pulse width modulation control signals such that the first second pulse width modulation control signals change from a synchronous state to an asynchronous state.. .

04/14/16
20160101278 

Medical treatment system and methods using a plurality of fluid lines


Improvements in fluid volume measurement systems are disclosed for a pneumatically actuated diaphragm pump in general, and a peritoneal dialysis cycler using a pump cassette in particular. Pump fluid volume measurements are based on pressure measurements in a pump control chamber and a reference chamber in a two-chamber model, with different sections of the apparatus being modeled using a combination of adiabatic, isothermal and polytropic processes.

04/14/16
20160101227 

Medical treatment system and methods using a plurality of fluid lines


Improvements in fluid volume measurement systems are disclosed for a pneumatically actuated diaphragm pump in general, and a peritoneal dialysis cycler using a pump cassette in particular. Pump fluid volume measurements are based on pressure measurements in a pump control chamber and a reference chamber in a two-chamber model, with different sections of the apparatus being modeled using a combination of adiabatic, isothermal and polytropic processes.

04/07/16
20160099661 

Method to generate multilevel inverter modulation control signals


A method generates space vector modulation signals for a multi-level power inverter using space vector pulse width modulation (svpwm). A reference voltage and a triangle region for the reference voltage are determined.
Mitsubishi Electric Research Laboratories, Inc.


03/31/16
20160094370 

Communication devices


Devices, systems and methods are provided where a request may be transmitted based on a first encoding scheme, and a response to the request may be transmitted based on a second encoding scheme different from the first encoding scheme. The second encoding scheme may comprise an edge-based pulse width modulation encoding scheme..
Infineon Technologies Ag


03/31/16
20160094166 

Method for estimating the angular position of the rotor of a polyphase rotary electrical machine, and application to the control of a polyphase inverter for such a machine


According to the method of the invention, the estimation of the angular position is obtained by calculating at least one first estimator as solution of a differential algebraic equation whose coefficients depend on electric parameters of the rotating electric machine comprising first and second inductances of a stator respectively along a direct axis and a quadrature axis with respect to a magnetic flux produced by the rotor of the machine, a resistance of a phase winding and the magnetic flux produced by the rotor. The coefficients also depend on a reference voltage of a vector pulse width modulation (10) applied to the stator of the machine, on phase currents and on first derivatives with respect to time of these phase currents.
Valeo Equipements Electriques Moteur


03/24/16
20160082662 

Device and a 3d printing and manufacturing of materials using quantum cascade lasers


A 3d printer device utilizing at least one quantum cascade laser (qcl) image head having at least one beam focused in a focal plane of the device for building on a surface of the device a 3d model of a target object from a digital image. The inventive 3d printer is more compact in size due to the use of qcl image heads, which provides focused wavelengths of qcls matching the absorption properties in plastics for more efficient absorption of the radiant energy.

03/17/16
20160079731 

Blue laser aiming device


A laser aiming device includes a laser generator and a module activating the laser generator to generate a non-continuous laser beam in order to form a bright spot of light in a flickering manner that a flickering interval of the bright spot of light is short enough not to be noticed by a human eye. A pulse width modulation (pwm) of the control module modulates the laser beam in form of rectangular pulse wave to control an output power of the non-continuous laser beam being not exceed 5 mw continuous wave..
Ncstar, Inc.


03/10/16
20160073473 

Led driver


Dimming or illumination control of an led-based lighting fixture can utilize a combination of pulse width modulation and constant current reduction. A light emitting diode driver can implement pulse width modulation to control light over a first light intensity range and constant current reduction over a second light intensity range.

03/10/16
20160073072 

Projection image display apparatus


A projection image display apparatus of the present disclosure is provided with a plurality of light sources, a light combiner combining light rays emitted from the light sources, a light modulation element modulating light emitted from the light combiner, and a projection optical system projecting an image emitted from the light modulation element. The light sources are each controlled by pulse width modulation signals, and duty ratios of the pulse width modulation signals to the light sources differ from each other at least in a part of a set range of an amount of light combined by the light combiner..
Panasonic Intellectual Property Management Co., Ltd.


03/03/16
20160065087 

Current detecting circuit for power element


A current detecting circuit includes a current detecting unit and a signal production and transmission unit, and detects a current value through a power element, in response to a pulse width modulation signal inputted from a control circuit. The current detection unit detects the current value through the power element, at the timing when a carrier of the pulse width modulation signal determined based on a signal inputted from the control circuit takes on a minimal value and/or a maximal value.
Denso Corporation


03/03/16
20160065063 

Methods of generating output variable voltage and systems thereof


At least one example embodiment discloses a method of generating an output variable voltage. The method includes obtaining a selected mode of operation, the selected mode of operation being one of an voltage control mode and a frequency mode, determining an input voltage command based on the selected mode of operation, determining an input frequency command based on the selected mode of operation, adjusting at least one of the input frequency command and the input voltage command based on the selected mode of operation, generating a pulse width modulation reference based on the adjusted at least one of the input frequency command and the input voltage command and generating the output variable voltage based on the pulse width modulation reference..
Deere & Company


03/03/16
20160065055 

Circuit and correcting a power factor for ac direct lighting apparatus


A circuit for correcting a power factor for an ac direct lighting apparatus that includes a valley signal generating unit configured to receive a full-wave rectified ac input voltage signal and configured to compare an internal reference voltage signal and the ac input voltage signal to generate a valley signal, a reference voltage control unit configured to receive the generated valley signal and count clock cycles of an internal clock to detect a frequency of the ac input voltage signal and configured to determine a frequency of a drive current to control a reference voltage signal based on the determined frequency of the drive current and a reference voltage control clock generating unit configured to generate a pulse width modulation signal associated with a pulse width of the reference voltage signal and configured to generate the reference voltage control clock signal based on the generated pulse width modulation signal and the controlled reference signal. Thus, the circuit may control a phase of a drive current and adjust a variation of the reference voltage signal to improve the power factor of the circuit..
Magnachip Semiconductor,ltd.


03/03/16
20160064935 

Global synchronous pulse width modulation distributed grid-connected inverter system


The global synchronous pulse width modulation system includes main control unit and plurality of grid-connected inverters located at different geographical locations, wherein each grid-connected inverter is connected with a distributed power supply; each grid-connected inverter is connected with a grid through a point of common coupling; main control unit communicates with all grid-connected inverters through communication channels; main control unit receives information of grid-connected inverters and respectively sends a global synchronous signal containing global synchronous strategy to grid-connected inverters after determining global synchronous strategy; grid-connected inverters regulate the phases of their own pulse width modulation waves through global synchronous signal to enable pulse width modulation waves of grid-connected inverters to satisfy a phase difference of harmonic counteraction, so as to counteract harmonic current injected by grid-connected inverters into grid. Advantages include eliminating the disordered superimposition problem of harmonic current of the inverters and mutually counteracting harmonic current between distributed inverters..
Shandong University


03/03/16
20160062427 

Pulse width modulation based real-time clock system and associated method


A pulse width modulation (pwm) based real-time clock (rtc) system includes a voltage regulator circuit, a capacitor, an rtc circuit and an on-off logic. The voltage regulator circuit is arranged to generate a regulated voltage to a connection node when enabled; the capacitor is coupled to the connection node; the rtc circuit is coupled to the connection node; and the on-off logic is coupled to the voltage regulator circuit and arranged to alternately enable and disable the voltage regulator circuit..
Mediatek Inc.


03/03/16
20160059724 

Vehicle charging device and method


A vehicle charging device is provided. The vehicle charging device includes a power input unit receiving power supplied from an external power supply source, a relay unit delivering the power received through the power input unit to a vehicle, a pilot circuit controlling an operation of the relay unit and generating a pilot signal for controlling vehicle charging, wherein the pilot circuit sequentially performs a first operation for leading a stop of the vehicle charging by changing a duty ratio of a pulse width modulation (pwm) signal corresponding to the pilot signal and a second operation for allowing the power not to be delivered to the vehicle by opening the relay unit when the stop of the vehicle charging is not performed by the first operation..
Lsis Co., Ltd.


02/25/16
20160056741 

Device for determining a position of a rotor of an electric motor


A device for determining a rotor position in a polyphase electric motor has a power control unit for applying drive voltages according to a pulse width modulation scheme so as to synchronously drive the motor. A measurement unit is arranged for measuring a voltage value on a respective phase by determining a zero-crossing interval where the phase current is around zero, disconnecting the phase from the respective drive voltage during the zero-crossing interval, and measuring the voltage value when the drive voltage of a first other phase is the supply voltage and the drive voltage of a second other phase is the zero voltage.
Freescale Semiconductor, Inc.


02/25/16
20160054744 

Digitally controlled ac protection and attenuation circuit


A protection and attenuation circuit for sensitive ac loads is described. The circuit provides ac power protection and attenuation utilizing high-efficiency switch-mode techniques to attenuate an ac power signal by incorporating a bidirectional, transistorized switch driven from a pulse width modulation signal, pwm.
Dolby Laboratories Licensing Corporation


02/25/16
20160054371 

Apparatus and checking whether sub unit is connected to main controller


Provided is an electronic device capable of checking whether a sub unit is connected to a main controller. The electronic device includes a main controller including a pulse width modulation (pwm) port, and at least one sub unit configured to receive a pwm signal from the main controller and to operate according to the pwm signal.
Samsung Electronics Co., Ltd.


02/25/16
20160053755 

Control valve and variable capacity compressor provided with said control valve


A control valve is disclosed that drives a valve body in a valve closing direction against urging forces of a bellows assembly and an open spring by an electromagnetic force generated in an electromagnetic coil portion by a drive current subjected to pulse width modulation. The control valve is provided with a notch portion formed in an inner peripheral wall of a through hole portion disposed in an end wall of a solenoid housing, so that a magnetic resistance between a peripheral wall of a movable iron core housed in a housing member and the inner peripheral wall of the through hole portion in a region of the notch portion differs from that in the other region around the movable iron core.
Sanden Holdings Corporation


02/25/16
20160052209 

Heating control apparatus and control method thereof


A heating control apparatus and a control method thereof are provided. The heating control apparatus includes a heating module, a temperature sensing module, a pulse width modulation circuit, and a comparator.
Cal-comp Electronics & Communications Company Limited


02/18/16
20160050733 

Power supply, power control method thereof, and display apparatus having the same


A power supply and method of controlling power supplied to a light source are disclosed. The power supply includes a dimming-control voltage generator configured to generate a dimming-control voltage based on first and second adjustment values; a dimming controller configured to output a dimming control signal for controlling analog dimming and pulse width modulation (pwm) dimming of a light source based on the dimming-control voltage; and a driver configured to control the analog dimming and the pwm dimming of the light source based on the dimming control signal..
Samsung Electronics Co., Ltd.


02/18/16
20160050089 

Edge-based communication with a plurality of slave devices


Methods, systems and devices related to bidirectional edge-based pulse width modulation communication systems are disclosed. In some implementations, upon receipt of a predetermined trigger pulse at least two slave devices perform an action..
Infineon Technologies Ag


02/18/16
20160049892 

Systems and methods for variable speed drives


Systems and methods for driving downhole equipment using a variable speed drive that has a switching mechanism between a first, constant-voltage capacitor bank and a second capacitor bank to control the voltage on the second capacitor bank, thereby enabling generation of a six-step output waveform while maintaining low input harmonics. In one embodiment, a variable speed drive has a converter section, an inverter section, two capacitor banks and a chopper.
Baker Hughes Incorporated


02/18/16
20160049874 

Apparatus and current sharing in a multi-phase switching regulator


An apparatus and method for a multi-phase switch regulator with improved efficiency is disclosed. The device has parallel implementations for the different phases comprising a driver, a current sense variable gain amplifier, a current share circuit, a pulse width modulation (pwm) control circuit, a trim network, and an inductor.
Dialog Semiconductor Gmbh


02/18/16
20160049869 

Pwm generation for dc/dc converters with frequency switching


A method and apparatus for generating a pulse width modulation (pwm) control signal generates a sawtooth ramp signal at a first frequency under standard operating conditions using a ramp generator, and generates a sawtooth ramp at a second frequency under alternative operating conditions. The sawtooth ramp is combined with an error threshold by a pwm controller to generate a square wave pwm control signal.
Continental Automotive Systems, Inc.


02/18/16
20160047579 

Increased efficiency of crank case heating using pulsed stator heat


A compressor heating system may include a compressor drive controller electrically coupled to an outdoor controller configured to selectively implement a pulse width modulation algorithm to deliver a pulsed dc current from the compressor drive controller to at least one stator winding of a motor of a variable speed compressor to provide more efficient auxiliary heating to the compressor to prevent refrigerant migration to the compressor when the compressor remains idle with respect to operating in a cooling or heating mode. The compressor heating system may consume less off-cycle power than traditional compressor auxiliary heating systems, thus complying with regulatory requirements where off-cycle power must average below specific thresholds..
Trane International Inc.


02/11/16
20160043709 

Signal conversion system and method


A signal conversion system and method for converting an input signal to a pulse width modulated signal is disclosed. The signal conversion system includes a sample rate converter coupled with an associated pulse width modulation (pwm) module.
Actiwave Ab


02/11/16
20160043628 

Power conversion apparatus and protection method thereof while feedback current signal being abnormal


A power conversion apparatus and a protection method of the power conversion apparatus while a feedback current signal of the power conversion apparatus is abnormal are provided. The protection method includes a step of stopping switching a power switch if a duty cycle of a pulse width modulation signal is continuously greater than a preset duty cycle for at least one signal cycle and a voltage of a current sensing signal is smaller than a preset voltage level during the at least one signal cycle..
Power Forest Technology Corporation


02/11/16
20160041566 

Apparatus and controlling temperature


A temperature control apparatus is provided. The temperature control apparatus includes an analog to digital (ad) converter digital-converting a measurement value transmitted from a plurality of temperature sensors; a control means comparing the measurement value transmitted from the ad converter with a preset desired value to perform pid calculation; and an output unit transmitting, to outside, a pulse width modulation (pwm) control signal transmitted form the control means, wherein an input-side isolator for isolation for each temperature sensor is provided between the ad converter and the temperature sensor, the input-side isolator is connected to each of the temperature sensors, and the control means sequentially operates the input-side isolators..
Lsis Co., Ltd.


02/04/16
20160036328 

Voltage converter and a voltage conversion the voltage converter


A voltage converter includes first and second charging elements, first and second switches, and first and second switch controllers. The first switch controller adjusts a first activation timing of a first control signal in response to a pulse width modulation signal, a switch signal, and a first control signal.

02/04/16
20160036237 

Method and multi channel current driving


A multi-channel current control circuit and method are disclosed herein. The multi-channel current control includes an operational amplifier provided for a channel; a low pass filter provided for the channel connected to an input terminal of the operational amplifier; a mode control circuit configured to control the low pass filter to have one of predetermined time constants in accordance with predetermined current control mode; and a pulse width modulation circuit configured to generate a pulse width modulation signal provided for the channel; and transfer the pulse width modulation signal to the input terminal of the operational amplifier via the low pass filter.
Abov Semiconductor Co., Ltd.


01/28/16
20160023561 

Power module printed circuit board


An analog control system configured to operate a converter in an electric vehicle battery charging system is provided. The analog control system includes a pulse width modulation (pwm) output unit that is configured to output a pwm signal to the converter and an integrated control unit that is configured to sense an input voltage and an output voltage of the converter.
Kia Motors Corporation


01/21/16
20160021715 

Light emitting device driver circuit and control circuit and control method thereof


The present invention provides a light emitting device driver circuit and a control circuit and a control method thereof. The light emitting device driver circuit is used for driving a light emitting device circuit according to a rectified dimming signal.
Richtek Technology Corporation


01/21/16
20160017940 

System and electrically controllable transmissions


Systems and methods are shown for electrically controllably transmitting power from a motor involving electrically controllably coupling the first input hub to a shuttle so that power is transmitted from the first input hub to the shuttle, providing for one-way rotation between the shuttle and a stationary chassis, and coupling the shuttle to an output hub with a spring such that energy is stored and released from the spring as the output hub rotates. Examples are shown that include controlling engaged and disengaged time intervals of the first input hub and shuttle to maintain a torque level at the output hub, such as by utilizing pulse width modulation or pulse frequency modulation.
Sri International


01/14/16
20160013957 

Pulse width modulation data recovery device and driving method thereof


A pulse width modulation (pwm) data recovery device includes a differential-to-single (dts) circuit configured to generate a pwm bit using a differential data signal including a differential positive data signal and a differential negative data signal, and an alignment buffer configured to activate a bit lock signal by detecting a synch pattern, recover symbol data by receiving the pwm bit in synchronization with one of the differential positive data signal and the differential negative data signal, and transmit the symbol data in synchronization with a reference clock.. .
Samsung Electronics Co., Ltd.


01/14/16
20160013748 

Voltage control apparatus, motor unit, image forming apparatus and voltage control method


In accordance with one embodiment, a voltage control apparatus comprises a pulse width control section, a pulse width modulation wave generation section, a variable amplifier control section and a variable amplifier. The pulse width control section specifies the pulse width of the pulse width modulation wave.
Toshiba Tec Kabushiki Kaisha


01/14/16
20160011611 

Fast response pulse width modulation control for switching regulator


A switching rectifier circuit includes a pulse width modulation controller, a voltage switching circuit, a pulse width modulation comparator, an error amplifier, a voltage reference, a high threshold voltage comparator and a low threshold voltage comparator. A varying output voltage of the voltage regulator is sampled and compared to a high threshold voltage reference and a low threshold voltage reference.
Sandisk Technologies Inc.


01/07/16
20160006367 

Methods and power conversion system control apparatus to control igbt junction temperature at low speed


Methods, apparatus and computer readable mediums are presented for controlling a multiphase inverter in which third harmonic injection pulse width modulation (thipwm) is used for generating inverter switching control signals at or above a non-zero threshold inverter output frequency, and high frequency injection discontinuous pulse width modulation (hfidpwm) is used for inverter output frequencies below the threshold, where the threshold frequency corresponds to a threshold period less than or equal to the thermal impedance time constant of the inverter switching devices, and the injected high frequency component for hfidpwm corresponds to a common mode period less than the thermal impedance time constant to mitigate thermal stress on the inverter switches and low speed inverter output derating.. .
Rockwell Automation Technologies, Inc.


01/07/16
20160001665 

Pulse width modulation resonance converter and charger for vehicle using the same


A pulse width modulation resonance converter is provided that includes a transformer and a switching unit including first to fourth switches electrically connected to a primary coil of the transformer and configured to convert a dc voltage into an ac voltage by a switching operation of the first to fourth switches in which each switch is switched from an off state to an on state when a voltage difference between both ends is about 0. Additionally, a rectifying unit includes an output capacitor, first to fourth diodes electrically connected to a secondary coil of the transformer, and a resonance tank having a resonance capacitor and a resonance inductor which are electrically connected to the secondary coil of the transformer.
Kia Motors Corporation


12/31/15
20150381067 

Multiple output converter and controlling the same


A multiple output converter is provided. The multiple output converter includes a power conversion circuit and a switching control unit.
Foundation Of Soongsil University-industry Cooperation


12/31/15
20150381039 

Cascaded buck boost dc to dc converter and controller for smooth transition between buck mode and boost mode


Cascaded buck boost dc to dc conversion systems, controllers and methods are presented, in which a buck converter stage is pulse width modulated in a first mode and a boost converter stage is pulse width modulated in a second mode, with the pulse width modulation using a first one of peak current control in valley current control in the first mode, and using the other of peak current control in valley current control in the second mode, and operation is switched between the first and second modes based on an on-time of a low side driver switch of the buck converter stage or the boost converter stage.. .
Texas Instruments Incorporated


12/31/15
20150377933 

Integrated circuit, current sense circuit for a pulse width modulation driver and method therefor


A current sense circuit for a pwm driver comprises: a pwm control circuit comprising: a first switching device arranged to receive a pwm signal from the pwm driver whose current is to be sensed; and a second switching device whose supply current is arranged to track the sensed current of the pwm driver. An adc is operably coupled to the first and second switching device.
Freescale Semiconductor, Inc.


12/24/15
20150372513 

Multiple battery charger and controlling the same


A multiple battery charger is provided. The multiple battery charger includes an input unit configured to receive or block power from a power supply unit, an output unit including a plurality of output terminals, wherein the plurality of output terminals are commonly connected to the input unit and charge a plurality of batteries, and wherein each of the plurality of output terminals includes at least one of a plurality of second switches for a selective receipt of the power from the input unit and the plurality of output terminals are controlled in a time division multiple control manner, and a switching control unit configured to transmit a pulse width modulation signal to the input unit and the output unit so as to independently control the power applied to the plurality of batteries.
Foundation Of Soongsil University-industry Cooperation


12/17/15
20150365101 

Method and device for producing a digital signal


A method is provided for generating a digital signal from an analog signal generated using a frequency converter on the basis of pulse width modulation with a variable period duration, values of the digital signal corresponding to an average value of the analog signal over an associated period duration of the pulse width modulation. The method includes the acts of: generating a bit stream on the basis of the analog signal using a sigma-delta modulator, the bit stream being generated with a constant modulator clock; generating temporally successive digital samples during an associated period duration by filtering the bit stream using a number of digital filters, intervals of time between the temporally successive digital samples being multiples of the modulator clock, the digital filters being started with a time delay with respect to one another in the intervals of time of the multiples of the modulator clock, and a respective digital filter outputting an associated digital sample, and forming an average value of the digital samples generated during the associated period duration, the average value forming the value of the digital signal (ds) for the associated period duration..
Lenze Automation Gmbh


12/17/15
20150362545 

Fluorescent lamp testing device


A fluorescent lamp testing device 10 has a microcontroller 100 that controls tests for ballast discrimination as well as gas integrity, ballast operation, filament continuity and line voltage. The ballast discrimination test is performed by the microcontroller 100 in combination with a photodiode 30 and high/low pass filter 32.
Fluke Corporation


12/10/15
20150359057 

Controller and dimming light-emitting diodes


A controller for dimming light-emitting diodes includes a pulse width modulation pin, a low-pass filter, a frequency detection unit, and a control signal generation module. The low-pass filter generates a direct current signal according to a pulse width modulation signal generated by a micro-controller.
Leadtrend Technology Corp.


12/10/15
20150357934 

Method and device for controlling an inverter


The invention relates to a method for controlling an inverter (10) using space-vector pulse width modulation, in particular to control an electric machine (14), the inverter (10) being equipped with a plurality of controllable switches (s) and being designed to provide a polyphase electric current (iu, iv, iw), in particular to supply polyphase electric current (iu, iv, iw) to the electric machine (14). In said method, a desired current space vector (i1*) having a desired phase angle (alpha1) and a desired amplitude (i1) is predefined, and the inverter (10) is controlled in such a way that a plurality of different successive switching states (v0-v7) is established for the switches (s) in order to provide the electric current (iu, iv, iw) in the form of a current space vector (i*), the inverter (10) being controlled in such a way that the current space vector (i2*) is provided at a phase angle (alpha2) which differs from the desired phase angle (alpha1) in order to load the switches (s) according to a desired load value (m) for the switches (s)..
Robert Bosch Gmbh


12/10/15
20150357915 

Driving circuit, voltage converter having adaptive dead time control function and controlling dead time


A voltage converter includes a switching driver, a controller, a low-pass filter and a pulse width modulation signal generator. The switching driver includes a pull-up switching circuit connecting an input voltage to a switching node in response to a pull-up signal and a pull-down switching circuit connecting a ground voltage to the switching node in response to a pull-down signal.
Samsung Electronics Co., Ltd.


12/10/15
20150357902 

Voltage converter and voltage converting method


A voltage converter includes a voltage conversion circuit, a pulse width modulation (pwm) signal generating module, a feedback controlling module, and a subtractor. The voltage conversion circuit is configured to convert an input voltage to an output voltage according to a pwm signal.
Delta Electronics, Inc.


12/03/15
20150351190 

Solid state lighting apparatuses, circuits, methods, and computer program products providing targeted spectral power distribution output using pulse width modulation control


A solid state lighting apparatus can include a variable color input signal configured to indicate a target color of light output from the apparatus. A string current pulse width modulation (pwm) controller circuit can be coupled to the variable color input signal, where the string current pwm controller circuit can be configured to generate a plurality of pwm signals having respective variable duty cycles to enable/disable respective particular string currents for respective variable times as the variable color input signal changes..
Cree, Inc.


12/03/15
20150349767 

Pulse width modulation control unit, voltage regulator and control method thereof


A pwm control unit is provided. A comparison unit compares an output voltage with a reference voltage to generate a first compared result, and controls a voltage of a first node.
Nuvoton Technology Corporation


12/03/15
20150349654 

Voltage-adjusting device and method in power conversion system


The present disclosure provides a voltage-adjusting device applied in a power conversion system including a vienna rectifier, a direct current (dc) bus, and an inverter. The voltage-adjusting device includes a grid voltage sampling module for sampling a grid voltage, a given bus voltage calculation module, a voltage-adjusting module, a current control module and a pulse width modulation module.
Delta Electronics (shanghai) Co., Ltd.




Pulse Width Modulation topics: Pulse Width Modulation, Modulation, Bridge Inverter, Duty Cycle, Control Unit, Ion Source, Illumination Source, Constant Current Source, Level Shift, Motor Control, Buck Boost, Capacitive Touch Sensor, Transmitter, Capacitive Touch, Reference Voltage

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