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Pulse Width Modulation patents



      
           
This page is updated frequently with new Pulse Width Modulation-related patent applications. Subscribe to the Pulse Width Modulation RSS feed to automatically get the update: related Pulse RSS feeds. RSS updates for this page: Pulse Width Modulation RSS RSS


Sensing a back electromotive force of a motor

Sensing a back electromotive force of a motor

Amplitude normalization circuit, power supply and electronic apparatus

Amplitude normalization circuit, power supply and electronic apparatus

Date/App# patent app List of recent Pulse Width Modulation-related patents
07/02/15
20150188469
 Method and system for controlling the progressive charging of an alternator of a motor vehicle, and motor vehicle alternator comprising such a system patent thumbnailnew patent Method and system for controlling the progressive charging of an alternator of a motor vehicle, and motor vehicle alternator comprising such a system
A method carried out in an alternator supplying a supply voltage slaved to a nominal value by means of a control loop controlling an excitation current of the alternator via a pulse width modulation of the current. The method limits the power draw by the alternator from the heat engine of the vehicle in a progressive response phase (lrc_ph) with a higher supply voltage drop to a pre-determined triggering threshold by only authorizing progressive increases of a current cyclic ratio (dc_exc) of the excitation current from an initial cyclic ratio (dc_i) to an expected cyclic ratio calculated by the control loop.
07/02/15
20150188465
 Sensing a back electromotive force of a motor patent thumbnailnew patent Sensing a back electromotive force of a motor
An apparatus includes a controller and a comparator. The controller generates pulse width modulation (pwm) signals to drive stator windings of a brushless direct current (bldc) motor in a commutation sequence such that one of the stator windings at a given time is open; and generates a tracking signal synchronized to the pwm signals and indicative of times when a leakage current is present in the open stator winding.
07/02/15
20150188453
 Method and device for actuating an inverter patent thumbnailnew patent Method and device for actuating an inverter
The invention relates to a method for actuating an inverter (10) by means of space vector pulse width modulation, in particular for actuating an electrical machine (14), wherein the inverter (10) has a plurality of controllable switches (s) and is configured to provide a multi-phase electrical voltage (u, v, w) in the form of a voltage space vector (v*), wherein the controllable switches (s) are actuated in such a manner that different duty cycles of the switches (s) are set and a plurality of successive different switching states (v0-v7) of the switches (s) are set up to provide the voltage space vector (v*), wherein the duty cycles of the switches (s) are extended during a pulse width modulation period (t) if a duty cycle of one of the switches (s) falls below a predefined threshold (44) during the pulse width modulation period (t).. .
07/02/15
20150188424
 Pulse width modulation controller architectures patent thumbnailnew patent Pulse width modulation controller architectures
Systems, apparatuses, and techniques for pulse width modulation (pwm) are described. A described system includes a circuit that contains an inductor and a transistor that controls current through the inductor based on a pwm signal to produce an output; and a controller to provide the pwm signal, which includes pwm cycles that include on-durations and off-durations.
07/02/15
20150188412
 Amplitude normalization circuit, power supply and electronic apparatus patent thumbnailnew patent Amplitude normalization circuit, power supply and electronic apparatus
An amplitude normalization circuit includes: a peak detector that detects a peak value of a full-wave rectified voltage of an ac voltage; a triangular wave oscillator connected to the peak detector generates a triangular wave voltage having the peak value; a comparator connected to the triangular oscillator compares the triangular wave voltage with the full-wave rectified voltage and outputs a pulse width modulation signal; and a waveform converter connected to the comparator converts a waveform of the pulse width modulation signal and outputs an output voltage with constant amplitude.. .
07/02/15
20150188362
 Transformerless multi-level medium-voltage uninterruptable power supply (ups) system patent thumbnailnew patent Transformerless multi-level medium-voltage uninterruptable power supply (ups) system
Systems and methods for supplying power at a medium voltage from an uninterruptible power supply (ups) to a load without using a transformer are disclosed. The ups includes an energy storage device, a single stage dc-dc converter or a two-stage dc-dc converter, and a multi-level inverter, each of which are electrically coupled to a common negative bus.
06/25/15
20150180391
 Motor control circuit and method patent thumbnailMotor control circuit and method
In accordance with an embodiment, a drive circuit is provided for driving for a motor wherein the drive circuit includes a rotational state generation circuit connected to a state controller. The state controller is connected to a pulse width modulation detection circuit, a timer, and a duty control controller.
Semiconductor Components Industries, Llc
06/25/15
20150180389
 Motor control circuit and method patent thumbnailMotor control circuit and method
In accordance with an embodiment, a method for driving a motor includes decreasing a duty of an input signal to a motor and decreasing a duty of a duty control signal in response to decreasing the duty of the input signal the duty of the duty control signal is maintained at a first level in response to a reverse current signal and decreased from the first level in the absence of the reverse current signal. In accordance with another embodiment a driver circuit includes a state controller having an input coupled to a pulse width modulation detection circuit and an output connected to a reverse current detection circuit..
Semiconductor Components Industries, Llc
06/25/15
20150180387
 Motor controller patent thumbnailMotor controller
A motor controller includes a variable controller, a current controller and an electric power module. The variable controller is configured to receive a torque command, a position of a rotor of a motor, and a motor rotation speed, change a first axis current command and a second axis current command according to variation of the position of the rotor of the motor, and output the first axis current command and the second axis current command.
Kia Motors Corporation
06/25/15
20150180378
 Motor control circuit and method patent thumbnailMotor control circuit and method
In accordance with an embodiment, a stopping circuit includes a detection circuit connected to a subtraction amount determination circuit. A subtraction circuit is connected to the subtraction circuit and the subtraction circuit is coupled for receiving an output signal from the subtraction amount determination circuit.
Semiconductor Components Industries, Llc
06/25/15
20150180369

Cascaded h-bridge (chb) inverter level shift pwm with rotation


Cascade h-bridge inverters and carrier-based level shift pulse width modulation techniques are presented for generating inverter stage switching control signals, in which carrier waveform levels are selectively shifted to control thd and to mitigate power distribution imbalances within multilevel inverter elements using either complementary carrier or complementary reference modulation techniques.. .
Rockwell Automation Technologies, Inc.
06/25/15
20150179123

Display driving method


An electrowetting display device has at least one display element. The method of driving the display device comprises receiving data representing a display effect for display by the element.
Amazon Technologies, Inc.
06/25/15
20150177603

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
06/25/15
20150176709

Method of controlling parking control device of transmission


A method of controlling a parking control device of a transmission may include a) inputting data about a state of a vehicle, b) determining, based on the data input at a step of the a), whether a current situation is a first situation in which an actuator of the parking control device of the transmission is to be promptly controlled, a second situation in which noise is controlled to be minimized, or a third situation which is a normal situation, and c) controlling a pulse width modulation (pwm) duty cycle required to control the actuator to different values depending on the first, second, and situations determined at a step of the b), thus driving the actuator.. .
Kia Motors Corp.
06/18/15
20150171886

System and cascaded pwm digital-to-analog converter with hybrid dac interface


A system and method is disclosed for a digital to analog converter which includes an interpolation filter to up-sample a digital signal, a cascaded digital pulse width modulation noise shaper having multiple stages to suppress in-band quantization errors due to digital pulse width modulation and truncation errors, and a hybrid finite impulse response filter/digital to analog converter coupled to a reconstruction filter which outputs the analog signal. The cascaded noise shaper stages each operate using the same quantization error signal..
Taiwan Semiconductor Manufacturing Co., Ltd.
06/18/15
20150171843

High-resolution pulse width modulation signal generation circuit and method


A pulse width modulation (pwm) signal generation circuit and method are disclosed herein. The pwm signal generation circuit includes an integer part pulse generation circuit, and a fractional part pulse generation circuit.
Abov Semiconductor Co., Ltd.
06/18/15
20150171732

Dc-dc converter and display device including the same


A dc-dc converter includes: a converter including a first transistor, a second transistor and an inductor; a first gate driver and a second gate driver configured to respectively control the first and second transistors; a pulse width modulation (pwm) control circuit configured to output a pwm signal to the first gate driver and a first logic circuit, the first logic circuit configured to receive the pwm signal and a second logic signal, and to output a first logic signal to the second gate driver; and a second logic circuit configured to receive a first control signal and a second control signal, and to output the second logic signal to the first logic circuit.. .
Samsung Display Co., Ltd.
06/18/15
20150170601

Converter and display apparatus having the same


A converter includes a feedback part, a pulse width modulation (pwm) controller and a pwm generator. The feedback part is configured to output a feedback signal based on a driving voltage.
Samsung Display Co., Ltd.
06/18/15
20150168983

Power conversion device, isolated driving circuit, and isolated driving method


A power conversion device, an isolated driving circuit, and an isolated driving method are disclosed herein. The isolated driving circuit includes a control module, a transformer, a rectifying circuit, and a driving auxiliary circuit.
Delta Electronics (shanghai) Co., Ltd.
06/18/15
20150167589

Method and controlling high pressure shut-off valve


Disclosed are an apparatus and a method for controlling an automotive high-pressure shut-off valve. The apparatus may include a high-pressure shut-off valve that is disposed in a high-pressure fuel line and passes or stops fuel flowing through the fuel line depending on whether or not a current is supplied, a switching device that is disposed in a circuit line for allowing the current to flow to the high-pressure shut-off valve and is switchable, and a control unit that variably controls the current flowing through the high-pressure shut-off valve to reduce the current by changing an average voltage applied to the high-pressure shut-off valve through a pulse width modulation (pwm) control on the switching device..
Hyundai Motor Company
06/11/15
20150163880

Dimmable led lamp and dimming method


A dimmable light emitting diode (led) lamp is provided. The dimmable led lamp includes an alternating current (ac) input unit and at least one ac detection unit connected to the ac input unit.
Sengled Optoelectronics Co., Ltd
06/11/15
20150162856

Method and electronic device for improving the availability of an electromechanical actuator


A method for improving the availability of an electromechanical actuator of an electromechanical or electrohydraulic brake system in a motor vehicle, including electronic motor regulation functioning in a non-restricted operating mode (normal operation) for a field-commutated electric motor actuated by pulse width modulation. An electronic device having a setpoint value interface (1) for presetting setpoint variables and parameters, a module for calculating pulse width modulation switching times (4), a module for dead time compensation (5), a power electronics module (6) for actuating an electric motor (7) actuated on three phases, including a module for setpoint current determination (2) which is electrically connected to the field-oriented current controller (3) and receives, via this connection, setpoint current values (id_set, iq_set) calculated using various state and/or estimated variables and stored parameters from the module for setpoint current determination..
Continental Teves Ag & Co. Ohg
06/11/15
20150162839

Flyback switching power supply circuit and backlight driving device using the same


The present invention provides a flyback switching power supply circuit and a backlight driving device using the same, the circuit includes: a transformer, including a primary winding, a secondary winding and an auxiliary winding arranged on one side of the primary winding; an output rectifier, connected to the output end of the flyback switching power supply circuit from the secondary winding of the transformer; a switching transistor, configured to control the voltage on the primary winding; a controller, configured to provide a pulse width modulation signal for driving the gate of the switching transistor; and a clamping delay circuit, configured to clamp the potential of the gate of the switching transistor to a low potential, so that the switching transistor is turned on at the wave trough of drain potential damped vibration. In the present invention, the mos transistor may be turned on at the wave trough of potential damped vibration of the drain thereof and the switching loss of the mos transistor thereby may be reduced by arranging the clamping delay circuit in the flyback switching power supply circuit and adding the auxiliary winding into the transformer..
Shenzhen China Star Optoelectronics Technology Co., Ltd.
06/11/15
20150161950

Backlight driving circuit, liquid crystal display device and drive method


The present invention provides a backlight drive circuit, and a liquid crystal display and a drive method for the same, wherein the backlight drive circuit includes: an error amplification unit configured to receive a feedback voltage from the backlight, and used for comparing the feedback voltage with a basis voltage, adjusting the amplification coefficient and the amplification speed for a comparison result based on the magnitude of the comparison result, and outputting an amplification result as a control signal; and a drive control unit configured to receive the control signal from the error amplification unit, and used for outputting, according to the control signal, a pulse width modulation dimming signal with a corresponding duty cycle to modulate a voltage signal output to the backlight from a power supply. The backlight drive circuit may be applied to driving operation for various display devises and capable of automatically adjusting response rate under different loading modes.
Shenzhen China Star Optoelectronics Technology Co., Ltd.
06/11/15
20150161949

Led boost converter and backlight led driver device using the same


The present disclosure discloses an led boost converter and an led backlight driver using the same. The led boost converter comprises an inductive boost circuit used in different display modes for boosting an input voltage to a working voltage necessary for the operation of led in a current display mode; a detecting circuit used in different display modes for selecting different detecting resistors for the different display modes so as to provide different detecting currents in the inductive boost circuit; and a controller used for providing a pulse width modulation signal so as to drive the inductive boost circuit, and for detecting whether a detecting voltage corresponding to the detecting current exceeds a reference voltage.
Shenzhen China Star Optoelectronics Technology Co. Ltd.
06/11/15
20150160077

Apparatus and monitoring component breakdown of battery system


An apparatus and a method for monitoring a breakdown of a battery system component are provided to more accurately determine whether a cooling fan for cooling a battery of an environment-friendly vehicle or a part related to the cooling fan fails. The method for monitoring a breakdown of a battery system component compulsorily driving, by a controller, the cooling fan and measuring the current temperature of the battery when the battery management system fails to receive a pulse width modulation pwm signal that represents an operation state of the cooling fan and a feedback signal (pfm) of the cooling fan from a cooling fan controller..
Kia Motors Corporation
06/11/15
20150158366

System and controlling heater of environmentally-friendly vehicle


A system for controlling a heater of an environmentally-friendly vehicle includes a signal input configured to input a heating demand. A positive temperature coefficient (ptc) heater is a heat source for heating.
Hyundai Motor Company
06/04/15
20150155795

Method and device for controlling an inverter


The invention relates to a method (60) for controlling an inverter (10) using space-vector pulse width modulation, in particular to control an electric machine (14), said 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 multiphase electric current to an electric machine (14). In said method, a reference phase angle (alpha_r) 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*).
Robert Bosch Gmbh
06/04/15
20150155712

Multi-level medium voltage data center static synchronous compensator (dcstatcom) for active and reactive power control of data centers connected with grid energy storage and smart green distributed energy sources


Systems and methods for supplying power (both active and reactive) at a medium voltage from a dcstatcom to an it load without using a transformer are disclosed. The dcstatcom includes an energy storage device, a two-stage dc-dc converter, and a multi-level inverter, each of which are electrically coupled to a common negative bus.
Inertech Ip Llc
05/28/15
20150145498

Pwm generation for dc/dc converters with frequency switching


A method for generating a pulse width modulation (pwm) control signal includes generating a sawtooth ramp signal at a first frequency under standard operating conditions using a ramp generator, generating a pwm square wave having a rising edge at a falling edge of the sawtooth ramp signal and a falling edge when the sawtooth ramp signal exceeds an error threshold, adjusting the frequency of the sawtooth ramp in response to a changed operating parameter of the ramp generator, and adjusting a peak input voltage of the ramp generator simultaneous with adjusting the frequency of the sawtooth ramp, thereby preventing one of a voltage overshoot and a voltage undershoot.. .
Continental Automotive Systems, Us, Inc.
05/28/15
20150145337

Power sharing device and method thereof


A power sharing device and method thereof are disclosed herein. The power sharing device includes a control unit, multiple regulators and multiple feedback circuits.
Accton Technology Corporation
05/28/15
20150144609

Welding or cutting power supply using phase shift double forward converter circuit (psdf)


A technique for dynamically adjusting an output voltage for a welding or cutting operation is provided. The technique allows for varying output voltage at the welding or cutting torch by manipulating the duty cycles of two forward converter circuits.
Illinois Tool Works Inc.
05/21/15
20150137764

Attenuation circuit for an energy storage device and attenuating oscillations of the output current of an energy storage device


The invention relates to an attenuation circuit for an energy storage device having one or more energy storage modules which are connected in series in one or more energy supply lines and have at least one energy storage cell and a coupling device which has a multiplicity of coupling elements and is designed to selectively switch or bridge the energy storage cell in the respective energy supply line. The attenuation circuit comprises a current detection device which is designed to detect an output current of the energy supply lines or of the energy storage device and to generate an output current signal dependent on the output current, a control circuit which is coupled to the current detection device and is designed to control the output current signal to a desired current signal and to output a corresponding current control signal, and a pulse width modulation device which is coupled to the control circuit and is designed to control the coupling device of at least one of the energy storage modules in a clocked manner on the basis of the current control signal..
Robert Bosch Gmbh
05/14/15
20150131332

Electronic apparatus and power controlling method thereof


Disclosed are an electronic apparatus and a power controlling method thereof, the electronic apparatus including a system portion configured to operate with a received voltage, and a power supply including a pulse width modulation (pwm) generator to generate a pwm signal, a converter to transfer voltage from a primary side to a secondary side in accordance with an output voltage of the pwm generator, and an output portion to supply voltage at the secondary side as standby voltage to the system portion, the pwm generator receives feedback on the standby voltage at the secondary side of the converter, the pwm signal is turned on/off in accordance with levels of the standby voltage at the secondary side, and voltage being supplied to components, except, when the pwm signal is turned off, voltage at the secondary side is only supplied to a component that monitors the feedback of the standby voltage.. .
05/14/15
20150131331

Apparatus and supplying power


Disclosed is an apparatus for supplying power to a device. The apparatus includes a transformer configured to output a predetermined voltage to a device varying in load; a switch configured to switch on and off the voltage output from the transformer in accordance with pulse width modulation (pwm) signals; a pwm signal supplier configured to supply the pwm signal to the switch; a feedback circuit which detects the output from the transformer and applies a control signal to the pwm signal supplier; and an output voltage controller which detects a load current of the device, and adjusts the control signal of the feedback circuit by adjusting the output detected by the feedback circuit in accordance with the detected load current..
05/14/15
20150130861

Driving apparatus, display apparatus, light source driving apparatus and driving method thereof


A display apparatus including: a display; a driver including an amplifier configured to detect a current of the display and to generate a constant current control signal, and a transistor configured to adjust the current supplied to the display in accordance an output voltage of the amplifier; and a controller configured to monitor the current of the display and a dropout voltage of the transistor, and control the amplifier so that a pulse width modulation (pwm) duty ratio is decreased in response to the dropout voltage being equal to or higher than a reference voltage.. .
05/14/15
20150130776

Analog data transmitter applied in lcd apparatus and operating method thereof


An analog data transmitter applied in a lcd apparatus includes an output pad, a channel operational amplifier, an initial switch, an auxiliary switch module, and a detection unit. The detection unit selectively starts a first switch unit or a second switch unit of the auxiliary switch module according to a pulse width modulation corresponding to a data conversion amplitude of an output data signal outputted from the output pad.
05/14/15
20150130431

Matrix converter and compensating for output voltage error


A matrix converter includes a power converter, a command generator, and a commutation controller. The power converter includes bidirectional switches each having a conducting direction controllable by switching elements.
05/14/15
20150130371

Backlight unit and a display device having the same


A backlight unit includes a dimming signal generator configured to generate first and second pulse width modulation signals, first and second driving blocks configured to receive a driving voltage to emit a light, a controller configured to receive the first and second pulse width modulation signals and an output signal from one of the first and second driving blocks to generate a voltage control signal, and a voltage converter configured to control a level of an input voltage in response to the voltage control signal to generate the driving voltage.. .
05/14/15
20150128662

Motor driving apparatus and laundry treatment machine including the same


The laundry treatment machine, absent a position sensor to sense the rotor position of a motor, includes a driving unit having an dc/ac inverter, an voltage detection unit to detect output voltage, and an inverter controller to control the inverter. The output voltage detection unit includes a plurality of resistors connected between the inverter and the motor and a comparator to compare voltage detected by some of the resistors with reference voltage and to detect pulse width modulation (pwm)-based output voltage.
05/14/15
20150128661

Motor driving apparatus and laundry treatment machine including the same


The laundry treatment machine; absent a position sensor to sense a rotor position, includes a driving unit having a dc/ac inverter, an output voltage detection unit to detect output voltage applied to the motor, and an inverter controller to control the inverter to drive the motor based on the output voltage. The output voltage detection unit includes a plurality of resistors electrically connected between the inverter and the motor and a comparator to compare voltage detected by some of the resistors with reference voltage and to detect pulse width modulation (pwm)-based output voltage.
05/07/15
20150123555

Led display systems


An led display system comprises an led array and an led driver circuit. An led driver circuit comprises components including a phase lock loop, a pulse width modulation engine, a configuration register, a series of gain adjustable fast charge current sources, and a serial input/output interface.
Sct Technology, Ltd.
04/30/15
20150117126

Pulse width modulation circuit


In order to reduce occurrence of a fetching error of a digital signal, caused by a power-source noise, there is provided a semiconductor device provided with a switching circuit for executing a switching operation according to a pulse control signal and a digital signal hold circuit for fetching a digital signal. The digital signal hold circuit includes a mask signal generation circuit for generating a mask signal from the pulse control signal, the mask signal being for use in keeping the digital signal from being fetched during a time period of power-source noise occurrence caused by the switching operation, and the digital signal is not fetched during the time period of power-source noise occurrence while the digital signal is fetched during a time period of power-source noise nonoccurrence..
Renesas Electronics Corporation
04/30/15
20150116380

Backlight driver chip incorporating a phase lock loop (pll) with programmable offset/delay and seamless operation


The embodiments discussed herein relate to systems, methods, and apparatus for synchronizing a pulse width modulation (pwm) dimming clock signal with a frame rate signal, line sync signal, and/or a horizontal sync signal of a display device. The pwm dimming clock signal can be generated by a synchronization block having a programmable offset/delay.
Apple Inc.
04/30/15
20150115856

Motor drive controller and motor drive control method


An motor drive controller may include: a mode control unit calculating a pulse frequency of a pulse width modulation (pwm) signal provided from an outside and generating an operating signal according to the calculated pulse frequency of the pwm signal, a regulator receiving the operating signal, transitioning to an enable state based on the operating signal, and generating a driving voltage and a motor control module receiving the driving voltage from the regulator and controlling an operation of a motor. The mode control unit is configured to set up a sleep mask time using a clock signal provided from the outside and control the regulator to maintain the enable state during the sleep mask time..
Samsung Electro-mechanics Co., Ltd.
04/23/15
20150110299

Method and device for driving digital speaker based on code conversion


A method and device for driving a digital speaker based on code conversion are provided in the invention. The method comprises the steps of: (1) converting input format; (2) performing multi-bit Σ-Δ modulation; (3) thermometer code conversion; (4) dynamic mismatch-shaping processing; (5) pulse width modulation code conversion; and (6) controlling on/off status switching of the mosfet of a full-bridge power amplification network to drive a digital speaker load sound.
Suzhou Sonavox Electronics Co., Ltd.
04/23/15
20150109044

Variable amplitude signal generators for generating a sinusoidal signal having limited direct current (dc) offset variation, and related devices, systems, and methods


Embodiments disclosed include variable amplitude signal generators for generating a sinusoidal signal having limited direct current (dc) offset variation and related devices and methods. Instead of employing a single pulse width modulation (pwm) signal to generate a sinusoidal signal, in one embodiment, a circuit is provided that generates two pwm signals.
Corning Mobileaccess Ltd.
04/23/15
20150108919

Light source circuitry


Light source circuitry comprises a first group of one or more light emitting diodes operable to emit light of a first color, a second group of one or more light emitting diodes operable to emit light of a second color, and a third group of one or more light emitting diodes operable to emit light of a third color, wherein the first, second and third groups of light emitting diodes are arranged such that, when a fixed current arrives at the light source circuitry, the fixed current is shared between the first, second and third groups, and wherein the circuitry is configured such that a proportion of the fixed current that flows through each of the first and second groups is controllable in dependence on a received control signal and such that the remainder of the fixed current flows through the third group. The light source circuitry allows the chromaticity of the combined light emissions of the light source circuitry to be varied gradually across a range using a single control signal and also without requiring the use of pulse width modulation (pwm).
Koninklijke Philips N.v.
04/16/15
20150105766

Radiofrequency amplifier impedance optimization


The present disclosure is directed to an electrosurgical generator including a resonant inverter having an h-bridge and a tank. The generator also includes a pulse width modulation (pwm) controller configured to output pwm timing signals to the h-bridge.
Covidien Lp
04/16/15
20150103877

Electro-magnetic interference reduction for switched signal systems


In one embodiment, a method receives a pulse width modulation signal. A value that is a function of the pulse width modulation signal is determined.
Marvell World Trade Ltd.
04/16/15
20150102753

Method and system for controlling motor of environmentally-friendly vehicle


A method and system for controlling a vehicle motor are provided. The system includes an inverter that controls the motor to receive a torque command from an external system and output a torque based on the torque command.
Hyundai Motor Company
04/16/15
20150102736

Controlling device for led decorative lights, a led light and a controlling led decorative lights


The present invention discloses a controlling device for led decorative lights, a led decorative light and a controlling method for led decorative lights. A controlling device for led decorative lights includes a power inverting module, a multi-mode controlling signal emitting module being coupled with the said power inverting module.
04/09/15
20150100173

Method and device for wifi controller electric switch


Disclosed is a wifi connected power outlet, or devices controlled by wifi devices. A relay, solid state switch, or other is used to reversibly connect devices to the mains power, optionally implementing pulse width modulation, voltage modulation, or other means for continuously varying power delivered to a load.
04/02/15
20150091493

Using pulse width modulation in a single phase drive system


Embodiments herein disclose a method for enabling operation of a single phase induction motor, the method comprising applying space vector pulse width modulation (pwm) to the single phase induction motor; determining pulse width using location of the space vector associated with space vector pwm; and enhancing voltage levels of the single phase induction motor for a particular dc bus voltage using the determined pulse width and the location of the space vector.. .
Tribi Systems Private Limited, Company
03/26/15
20150086185

Pulse width modulated multiple heater control


A system includes, in one example, a first heater device, a second heater device, and a temperature sensor, each disposed within a fluid flow. The system further includes a controller communicatively coupled to the first heater device, the second heater device, and the temperature sensor.
Hamilton Sundstrand Corporation
03/26/15
20150085541

Multi-level inverter and power supply system


A multi-level inverter includes two n-level inverter units with pulse width modulation waves staggered by a phase of 180 degrees, and n is an integer greater than or equal to 3; a direct current power source module, where an output end thereof is connected to input ends of the two n-level inverter units; a transformer, where the transformer includes a primary side and a secondary side, an inductor of the primary side and an inductor of the secondary side are coupled, and one end of the inductor of the primary side and one end of the inductor of the secondary side are connected to output ends of the two n-level inverter units respectively. The two n-level inverter units are reversely coupled, and the other end of the inductor of the primary side and the other end of the inductor of the secondary side are connected..
Huawei Technologies Co., Ltd.
03/26/15
20150084556

Motor driving method and operating method thereof


Provided is a motor driving circuit which transmits a driving signal to a motor, including a gate driver generating the driving signal corresponding to a pulse width modulation signal, a pulse width modulation signal generator generating the pulse width modulation signal according to hall sensor signals received from hall sensors mounted in the motor, a current sensor measuring a link current provided to the gate driver, a low pass filter outputting a filter current that high frequency components are removed from the measured link current, and a minimum power consumption estimating unit generating a lead angle according to a start signal with reference to the filter current, wherein the pulse with modulating signal is changed according to the lead angle.. .
Electronics And Telecommunications Research Institute
03/26/15
20150084554

Electric power tool


An electric power tool includes a rechargeable battery, a motor, a detector that detects a parameter that affects a voltage drop of the rechargeable battery and outputs a detection signal corresponding to the detected parameter, a controller that receives the detection signal and generates a control signal in accordance with the detection signal, and a power switching unit operated in accordance with the control signal from the controller to switch between a situation in which the rechargeable battery supplies electric power to the motor and a situation in which the rechargeable battery stops supplying electric power to the motor. The controller controls the power switching unit using a pulse width modulation (pwm) control signal when the electric power tool is activated.
Panasonic Corporation
03/19/15
20150079533

Software to control vibration


A processor containing software allowing for measuring the speed of a motor, and adjusting that speed by pulse width modulation is provided. A dedicated voltage limiter prevents excess speed, and a battery charge management controller to charge the battery and monitor the battery charge status, ensures battery voltage is regulated to 3.3 v.
Orthoaccel Technologies Inc.
03/19/15
20150078036

Power converters for wide input or output voltage range and control methods thereof


A power converter topology is adapted for efficiency according to input voltage, output voltage or output current conditions. Topology adaptation is achieved by control responsive to the input and output operating conditions, or to one or more external control signals.
Delta Electronics, Inc.
03/19/15
20150077083

Ramp signal generating method and generator thereof, and pulse width modulation signal generator


A ramp signal generating method and a generator thereof, and a pulse width modulation signal generator are provided. The ramp signal generating method includes following steps: receiving an error signal, wherein the error signal relates to an output voltage of a power converter; generating an error delayed signal according to the error signal; and providing a ramp signal according to the error signal and the error delayed signal.
Upi Semiconductor Corp.
03/19/15
20150077082

Apparatus and a boost converter with improved electrical overstress (eos) tolerance


An apparatus and method for a boost power converter with improved electrical overstress (eos) tolerance is disclosed. A boost power converter provides a providing a pulse width modulation (pwm) boost power converter with an electrical overstress (eos) boost over-voltage comparator/switch network comprises a boost power converter, a boost overvoltage comparator, a boost overvoltage comparator feedback network, and a boost overvoltage switch.
Dialog Semiconductor Gmbh
03/19/15
20150076999

Modifying duty cycles of pwm drive signals to compensate for led driver mismatches in a multi-channel led system


An led (light emitting diode) controller comprises a first led driver to generate a first pwm (pulse width modulation) drive signal to turn on or turn off, respectively, a first current through a first led string. Additionally, the led controller comprises a compensation circuit to generate the first pwm drive signal responsive to a first duty set signals.
Dialog Semiconductor Inc.
03/19/15
20150076210

Torque optimization for surgical instruments


A control system having speed management control. The control system can be in signal communication with a battery, and the battery can be coupled to a motor.
Ethicon Endo-surgery, Inc.
03/19/15
20150076209

Torque optimization for surgical instruments


A control system having speed management control. The control system can be in signal communication with a battery, and the battery can be coupled to a motor.
Ethicon Endo-surgery, Inc.
03/19/15
20150076002

Apparatus and treating aqueous solutions and contaminants therein


The present disclosure is generally directed to devices and methods of treating aqueous solutions to help remove or otherwise reduce levels, concentrations or amounts of one or more contaminants. The present disclosure relates to a method of which includes the application of a constant current or a pulse width modulation duty cycle to at least one counterelectrode (e.g.
Aquamost, Inc.
03/12/15
20150071338

Switched-mode high-linearity transmitter using pulse width modulation


A qam transmitter is disclosed that may reduce the frequency of local clock signals and/or reduce the switching frequency of driver circuits when generating a qam output signal for transmission. The qam transmitter may generate a number of pwm signals indicative of in-phase (i) and quadrature (q) signal components, and then use one or more selected even-order harmonics of the pwm signals to generate the qam output signal.
Qualcomm Incorporated
03/12/15
20150070943

High efficiency zero-voltage switching (zvs) assistance circuit for power converter


A system includes a power converter configured to convert input power into output power. The power converter includes first and second converter bridges, where each converter bridge includes multiple transistors.
Raytheon Company
03/12/15
20150069984

Buck converter with overshoot protection


A buck converter includes a pulse width modulation unit, a first switch, a second switch, an inductance, and a sensor near the inductance. The pulse width modulation unit controls the first switch and the second switch power to allow or disallow electrical conduction.
Hon Hai Precision Industry Co., Ltd.
03/12/15
20150069951

Multimode battery charger


A multimode battery charger circuit supporting switch mode and linear mode charging operations. In various embodiments, the multimode battery charging circuit includes mode control circuitry, a linear gate driver, a pulse width modulation (pwm) control circuit, a programmable constant current control loop circuit, and a programmable constant voltage control loop circuit.
Broadcom Corporation
03/12/15
20150069942

Tri-stating brushless dc motor phase for direct detection of back emf zero cross


A back electromotive force (bemf) zero cross may be detected in a brushless direct current (bldc) motor that is controlled by pulse width modulation (pwm). A phase input of the bldc motor is tri-stated during pwm periods in which the phase input conducts motor drive current, and the tri-stating of the phase input is used to determine whether a bemf zero cross has occurred in the bldc motor..
Texas Instruments Incorporated


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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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