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Pulse Width Modulation patents

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




 Light source driving circuit and method patent thumbnailnew patent Light source driving circuit and method
The present invention provides a light source driving circuit and method. The light source driving circuit is used to provide light source driving signals to a light source.
Shenzhen China Star Optoelectronics Technology Co., Ltd.


 Time signal generating circuit and time signal generating method patent thumbnailnew patent Time signal generating circuit and time signal generating method
A time signal generating circuit and a time signal generating method are provided. The time signal generating method includes following steps: receiving a feedback voltage and a reference voltage to provide a first control signal, wherein the feedback voltage is related to an output voltage of a power converter; receiving an input voltage and a default voltage to provide a second control signal; and adjusting an on-time of a pulse width modulation signal according to the first control signal and the second control signal..
Upi Semiconductor Corp.


 Method and system for control of contactor patent thumbnailnew patent Method and system for control of contactor
A method and system for controlling one or more contactors of a rechargeable energy storage system (ress) includes adjusting, via a controller, the respective actuating power provided to a respective one or more of the contactors, where adjusting of the actuating power is defined by the energized or non-energized condition of the vehicle and at least one parameter affecting holding and opening forces exerted on the respective contactor. In an example, the controller is configured to use feed forward factors defined by the at least one parameter and to adjust the dynamic actuating current by modulating the dynamic actuating current at a pulse width modulation (pwm) frequency defined by a feed forward window.
Gm Global Technology Operations Llc


 Method and system for providing pulsed power and data on a bus patent thumbnailMethod and system for providing pulsed power and data on a bus
A method and system for providing pulsed power and data from a main control unit to slave units via a first bus. The main control unit has an ac signal generator for providing a plurality of first pulses (p1) on the bus for providing the power to the slave units.
Vlaamse Instelling Voor Technologisch Onderzoek (vito) Nv


 Combinatorial/sequential pulse width modulation patent thumbnailCombinatorial/sequential pulse width modulation
A number of standard pwm generators produce pwm signals that may be used to drive the power stages for full-bridge, feed-forward, push-pull, phase-shift zero voltage transition (zvt), and other switched mode power supply (smps) conversion topologies. These pwm signals may be fed to logic functions of a combinatorial logic block.
Microchip Technology Incorporated


 Three input comparator patent thumbnailThree input comparator
A three input voltage comparator provides termination of a pulse width modulation (pwm) output in a switched mode power supply. Shutdown of the pwm signal occurs when a sense current from the switching transistors exceeds either or both of the limit and error current references.
Microchip Technology Incorporated


 Switched power converter with dual mode pwm / cot control patent thumbnailSwitched power converter with dual mode pwm / cot control
A power converter includes a switched power stage configured to generate an output voltage from an input voltage and a controller configured to generate a pulsed control signal for switching the switched power stage in dependence upon a voltage error signal. The voltage error signal is a difference between a reference voltage and an output voltage.
Zentrum Mikroelektronik Dresden Ag


 Buck power stage with multiple mosfet types patent thumbnailBuck power stage with multiple mosfet types
A buck voltage converter is disclosed. The buck voltage generator includes a controller configured to generate one or more pulse width modulation (pwm) signals, and a plurality of serially connected switches configured to receive the pwm signals and to generate an output voltage signal at an output terminal based on the received pwm signals.
Empower Semiconductor


 Pulse width modulation (pwm) driving scheme and bezel reduction patent thumbnailPulse width modulation (pwm) driving scheme and bezel reduction
This application sets forth a circuit configuration for a light emitting diode (led) or organic light emitting diode (oled) display. The circuit configuration allows for the pulse-width modulation (pwm) of each emission signal sent to each line of the display.
Apple Inc.


 Engine start and battery support module patent thumbnailEngine start and battery support module
An engine start and battery support module (or a vehicle is provided that utilizes a bank of ultra capacitors (ucs) charged with or without running the vehicle's alternator to levels that support both engine starting assistance and hotel load support. The ucs' per-cell charge can be adjured and raided during periods of low temperatures and even higher during ultralow temperatures.
Ioxus, Inc.


Amplifiers for parametric loudspeakers


Systems and methods of audio processing and control for improved audibility and performance in a parametric loudspeaker system. The parametric loudspeaker system includes a parametric loudspeaker providing a capacitive load, an output stage having a plurality of switches interconnected in a bridge configuration and connected to the capacitive load of the parametric loudspeaker, and a controller operative to generate a series of pulse width modulation (pwm) pulses, and to generate a plurality of control signals synchronized with the series of pwm pulses for switchingly controlling the plurality of switches in the bridge configuration, thereby driving the capacitive load of the parametric loudspeaker..

System and controlling forward/reverse rotation of fan


A control system includes a motor, an interface circuit, a motor controller and a detection control circuit. The interface circuit receives and converts a pulse width modulation signal.
Delta Electronics, Inc.


Utilization of different loudness encoding schemes in cochlear implant systems


An exemplary sound processor included in a cochlear implant system associated with a patient may 1) identify a loudness level of an audio signal presented to the patient, 2) determine that a stimulation pulse amplitude corresponding to the loudness level is greater than a maximum stimulation pulse amplitude allowed by a compliance voltage associated with a cochlear implant implanted within the patient, and 3) direct, in response to the determination that the stimulation pulse amplitude is greater than a maximum stimulation pulse amplitude allowed by the compliance voltage, the cochlear implant to represent the loudness level to the patient by directing the cochlear implant to generate and apply one or more stimulation pulses to the patient in accordance with at least one of a first encoding scheme that includes pulse density modulation and a second encoding scheme that includes a combination of pulse amplitude modulation and pulse width modulation.. .
Advanced Bionics Ag


Pulse width modulation


A device includes a combining circuitry that receives an incoming signal, and one or more delayed signals from a delay circuitry. The combining circuitry combines the incoming signal and the one or more delayed signals to generate a combined signal.
Marvell World Trade Ltd.


Increasing pwm resolution for digitally controlled motor control applications


Systems and methods for increasing pulse width modulation (pwm) resolution for digitally controlled motor control applications are described. For example, in some embodiments, a method may include receiving a clock signal having a given period; identifying a target duty cycle; calculating a comparison point based upon the given period and the target duty cycle; generating a pwm signal based upon the clock signal using the comparison point; and varying the comparison point to increase a resolution of an effective duty cycle of the pwm signal..
Texas Instruments Incorporated


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..
Indiana University Research And Technology Corporation


Power converter with adaptive zero-crossing current detection


A power converter with adaptive zero-crossing current detection is provided. The power converter includes a first transistor, a second transistor, a pwm (pulse width modulation) controller, a low-pass filter, and a delay controller.
Mediatek Inc.


Power conversion device and driving the same


A power conversion device includes: a first dc-dc converter configured to receive a first power from a first dc power source and to convert at least one of a voltage level and a current level to generate a first converted power; a dc-ac inverter electrically coupled to the first dc-dc converter and configured to convert the first converted power into a first ac power and to provide the first ac power to an external device; and a control unit configured to control the first dc-dc converter and the dc-ac inverter, wherein the first dc-dc converter and the dc-ac inverter are configured to be driven according to pulse width modulation (pwm) scheme using a first carrier frequency and a dc-ac carrier frequency, respectively, wherein a level of the first carrier frequency and a level of the dc-ac carrier frequency are determined according to predetermined time periods.. .
Samsung Sdi Co., Ltd.


Display device and driving backlight thereof


A display device and a method for driving a backlight thereof are provided. The display device includes a signal generator configured to generate a first pwm (pulse width modulation) signal and a second pwm signal, a low current driver configured to generate first output current using the first pwm signal, a high current driver configured to generate second output current using the second pwm signal, and a backlight configured to be driven by at least one of the first output current generated by the low current driver and the second output current generated by the high current driver.
Samsung Electronics Co., Ltd.


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Configurable serial and pulse width modulation interface


A reconfigurable register device includes an arrangement of storage elements arranged sequentially in a chain structure. Each storage element stores a state of a binary signal.
Freescale Semiconductor, Inc.


Projector


A projector can prevent a flicker from being caused by rotation of a rotating phosphor plate. The projector includes a solid-state light source that emits excitation light, a rotating phosphor plate that converts the excitation light into phosphor light, a liquid-crystal light modulating device that modulates the light from the rotating phosphor plate, a projection optical system that projects the modulated light onto a screen, and a control device that controls the solid-state light source and the rotating phosphor plate so as to satisfy any one of a conditional expression a=b, a conditional expression a=2b, and a conditional expression .
a−b


Wireless controlling voltage supplied to amplifier unit


Provided is a technique for effectively implementing dc removal during switching of transmission scheme or transmission data in a wireless apparatus equipped with a function for supplying a voltage to a power amplifier by et control. When the et control is not carried out in a power supply unit, more specifically, when an iq signal is not present, a control unit outputs a pulse width modulation (pwm) signal for a fixed voltage via a switch unit.
Hitachi Kokusai Electric Inc.


Demodulation circuit and wireless charging device having the same


The present disclosure illustrates a demodulation circuit disposed in a wireless charging device. The demodulation circuit comprises a detection unit, a delay unit and a demodulation unit.
Anpec Electronics Corporation


Systems and methods for efficient provision of arc welding power source


Methods and systems for creating and controlling an ac output for welding, plasma cutting or heating are provided. One embodiment of the present disclosure achieves a desired square wave ac output and reduces the number of circuit components needed by combining components of a buck converter and a full bridge inverter.
Illinois Tool Works Inc.


Integrated single body compact welder


An integrated single body compact welder comprises a single unit constructed as one body in a centralized arrangement, a body portion mounting the single unit therein, an handle portion integrated to the body portion and a welding rod holder mounted on a support portion which is fixed to the body portion, in which the body portion comprises a heat sink, a power input/output circuit portion including a rectifying portion and an inverter circuit constituted by mounting parts on a first print circuit board positioned on the lower surface of the heat sink; and a system operating control portion including a system direct current supply portion and a control portion including a pulse width modulation circuit for controlling a system output power, which are constituted by mounting parts on a second print circuit board positioned on the upper surface of the heat sink.. .
Rexwel Co., Ltd.


Power factor correction controlling circuit and driving method thereof


A power factor correction controlling circuit includes a control signal providing circuit configured to provide a control signal associated with a feedback signal, the feedback signal being controlled based on a bias signal, a pulse width modulation signal controlling circuit configured to control a pulse width modulation signal based on one of first and second bias signals and a power factor controlling circuit configured to provide a power factor control signal when an amplitude of the pulse width modulation signal reaches that of the power factor control signal. Such a circuit is able to operate stably, regardless of a load condition and an input voltage condition..
Magnachip Semiconductor, Ltd.


Method of signal generation for neuromodulation


The frequency spectrum of the signal may be shaped by pulse width modulation, frequency modulation, and one or more filters may be applied to the signal.. .

Electronic smoking device


An electronic smoking device comprises a housing accommodating a battery (10) as an electric power source powering an electrically heatable atomizer comprising an electric heater (22) and adapted to atomize a liquid supplied from a reservoir to provide an aerosol exiting from the atomizer. The heater (22) of the atomizer is controlled by means of control electronics (14).
Fontem Holdings 2 B.v.


Method on digital deep dimming through combined pwm and pfm


Techniques and systems for deep dimming in an led lighting system using any general microcontroller with a 16-bit timer/pwm module are provided. The techniques combines pwm (pulse width modulation) and pfm (pulse frequency modulation), and makes use of standard features of general microcontroller to reach a deep dimming level (such as 0.1% of the maximum output) without special hardware between microcontroller outputs to led array.
Bridgelux, Inc.


Method of generating a pulse width modulation (pwm) signal for an analog amplifier, and a related pulse width modulator


A method (300) of generating a pulse width modulation (pwm) signal for an analog amplifier, the amplifier arranged to receive an amplifier input signal having a magnitude, is disclosed. The method comprises receiving (302) a modulator input signal, which is associated with the amplifier input signal; and using (304) the modulator input signal to modulate a carrier to produce the pwm signal, wherein the carrier's frequency varies in dependence on the magnitude of the amplifier input signal.
Nanyang Technological University


Cooling fan module


A cooling fan module for a heat exchanger or the like, has a motor, a fan driven by the motor and a speed controller connected between the motor and a power supply. The speed controller is configured to operate the motor in a high speed mode and a low speed mode.
Johnson Electric S.a.


Pulse width modulation signal generation circuit and method


A pulse width modulation signal generation circuit and a pulse width modulation signal generation method are provided. A clock generator is configured for generating a clock signal including a plurality of pulses.
Nuvoton Technology Corporation


Precharging apparatus and power converter


Precharging systems and methods are presented for precharging a dc bus circuit in a power conversion system, in which precharging current is connected through a precharging resistance coupled between only a single ac input line and the dc bus circuit when the dc bus voltage is less than a non-zero threshold, and a controller individually activates controllable rectifier switching devices when the dc bus voltages greater than or equal to the threshold using dc gating or pulse width modulation to selectively provide a bypass path around the precharging resistance for normal load currents in the power conversion system.. .
Rockwell Automation Technologies, Inc.


Noise eliminating method and adapter


A noise eliminating method adapted to be used with an adapter and a touch device electrically connected with each other is provided. The adapter includes a voltage transformer, a switch and a control circuit.
Au Optronics Corp.


Electronic device and controlling electronic device


Provided an electronic device capable of suppressing the effects of noise caused by driving of a backlight, and preventing an erroneous detection of an operation on a touch panel. The electronic device includes a display, a touch panel, which is arranged on a display surface side of the display and is capable of detecting a touch operation, a backlight of the display, a backlight control unit configured to drive and control a current of the backlight based on pulse width modulation, and a cpu.
Canon Kabushiki Kaisha


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, and to output selected pixel information for specifying the selected pixels; 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 in accordance with the selected pixel information; and a driving unit configured to drive the laser elements in accordance with the assigned pulse width modulation signals.. .
Konica Minolta, Inc.


Type-c retimer state machine and a protocol for inband control and configuration


An apparatus for retimer configuration and control is described herein. The apparatus includes at least one retimer.

Variable displacement vane pump with integrated fail safe function


A variable displacement vane pump has a pressure controlled valve moveable between first and at least second valve positions based on an output pressure of the pressurized lubricant delivered through the outlet. The pressure controlled valve provides an integrated fail safe function to the pump when an electrical valve fails.

Control valve for variable displacement compressor


A control valve includes: a body having a port communicating with a discharge chamber, a port communicating with a control chamber, and a main valve hole formed in a passage connecting the ports; a main valve element configured to close and open a valve section by moving toward and away from the main valve hole; a solenoid configured to generate a force for driving the main valve element in valve opening and closing directions of the valve section, power supply to the solenoid being controlled according to pulse width modulation (pwm); and a vibration absorbing structure including a spring connected with a plunger configured to be displaced integrally with the main valve element, and a weight connected with the plunger with the spring therebetween in a relatively displaceable manner, and configured to suppress vibration of the main valve element caused by the pwm control.. .

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Variable displacement vane pump with integrated fail safe function


A variable displacement vane pump has a pressure controlled valve moveable between first and at least second valve positions based on an output pressure of the pressurized lubricant delivered through the outlet. The pressure controlled valve provides an integrated fail safe function to the pump when an electrical valve fails.

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..

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..

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.. .

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.. .

Projector


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


Space 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.


Switching 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.


Voltage 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.


Circuitry 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


Optimal 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..

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.


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.

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.


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.


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


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


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.


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


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


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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


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


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


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.


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


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.


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


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


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


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


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.


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.


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


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.


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..

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*)..

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..

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.

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.

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%.

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.. .

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..

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.. .

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.

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.

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.. .

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.

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.

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.


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


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


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.

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.


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.

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.


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


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


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.




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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