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Pulse Width Modulation patents



      

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




Date/App# patent app List of recent Pulse Width Modulation-related patents
02/04/16
20160036328 
 Voltage converter and a voltage conversion  the voltage converter patent thumbnailVoltage converter and a voltage conversion the voltage converter
A voltage converter includes first and second charging elements, first and second switches, and first and second switch controllers. The first switch controller adjusts a first activation timing of a first control signal in response to a pulse width modulation signal, a switch signal, and a first control signal.

02/04/16
20160036237 
 Method and  multi channel current driving patent thumbnailMethod and multi channel current driving
A multi-channel current control circuit and method are disclosed herein. The multi-channel current control includes an operational amplifier provided for a channel; a low pass filter provided for the channel connected to an input terminal of the operational amplifier; a mode control circuit configured to control the low pass filter to have one of predetermined time constants in accordance with predetermined current control mode; and a pulse width modulation circuit configured to generate a pulse width modulation signal provided for the channel; and transfer the pulse width modulation signal to the input terminal of the operational amplifier via the low pass filter.
Abov Semiconductor Co., Ltd.


01/28/16
20160023561 
 Power module printed circuit board patent thumbnailPower module printed circuit board
An analog control system configured to operate a converter in an electric vehicle battery charging system is provided. The analog control system includes a pulse width modulation (pwm) output unit that is configured to output a pwm signal to the converter and an integrated control unit that is configured to sense an input voltage and an output voltage of the converter.
Kia Motors Corporation


01/21/16
20160021715 
 Light emitting device driver circuit and control circuit and control method thereof patent thumbnailLight emitting device driver circuit and control circuit and control method thereof
The present invention provides a light emitting device driver circuit and a control circuit and a control method thereof. The light emitting device driver circuit is used for driving a light emitting device circuit according to a rectified dimming signal.
Richtek Technology Corporation


01/21/16
20160017940 
 System and  electrically controllable transmissions patent thumbnailSystem and electrically controllable transmissions
Systems and methods are shown for electrically controllably transmitting power from a motor involving electrically controllably coupling the first input hub to a shuttle so that power is transmitted from the first input hub to the shuttle, providing for one-way rotation between the shuttle and a stationary chassis, and coupling the shuttle to an output hub with a spring such that energy is stored and released from the spring as the output hub rotates. Examples are shown that include controlling engaged and disengaged time intervals of the first input hub and shuttle to maintain a torque level at the output hub, such as by utilizing pulse width modulation or pulse frequency modulation.
Sri International


01/14/16
20160013957 
 Pulse width modulation data recovery device and driving method thereof patent thumbnailPulse width modulation data recovery device and driving method thereof
A pulse width modulation (pwm) data recovery device includes a differential-to-single (dts) circuit configured to generate a pwm bit using a differential data signal including a differential positive data signal and a differential negative data signal, and an alignment buffer configured to activate a bit lock signal by detecting a synch pattern, recover symbol data by receiving the pwm bit in synchronization with one of the differential positive data signal and the differential negative data signal, and transmit the symbol data in synchronization with a reference clock.. .
Samsung Electronics Co., Ltd.


01/14/16
20160013748 
 Voltage control apparatus, motor unit, image forming apparatus and voltage control method patent thumbnailVoltage control apparatus, motor unit, image forming apparatus and voltage control method
In accordance with one embodiment, a voltage control apparatus comprises a pulse width control section, a pulse width modulation wave generation section, a variable amplifier control section and a variable amplifier. The pulse width control section specifies the pulse width of the pulse width modulation wave.
Toshiba Tec Kabushiki Kaisha


01/14/16
20160011611 
 Fast response pulse width modulation control for switching regulator patent thumbnailFast response pulse width modulation control for switching regulator
A switching rectifier circuit includes a pulse width modulation controller, a voltage switching circuit, a pulse width modulation comparator, an error amplifier, a voltage reference, a high threshold voltage comparator and a low threshold voltage comparator. A varying output voltage of the voltage regulator is sampled and compared to a high threshold voltage reference and a low threshold voltage reference.
Sandisk Technologies Inc.


01/07/16
20160006367 
 Methods and power conversion system control apparatus to control igbt junction temperature at low speed patent thumbnailMethods and power conversion system control apparatus to control igbt junction temperature at low speed
Methods, apparatus and computer readable mediums are presented for controlling a multiphase inverter in which third harmonic injection pulse width modulation (thipwm) is used for generating inverter switching control signals at or above a non-zero threshold inverter output frequency, and high frequency injection discontinuous pulse width modulation (hfidpwm) is used for inverter output frequencies below the threshold, where the threshold frequency corresponds to a threshold period less than or equal to the thermal impedance time constant of the inverter switching devices, and the injected high frequency component for hfidpwm corresponds to a common mode period less than the thermal impedance time constant to mitigate thermal stress on the inverter switches and low speed inverter output derating.. .
Rockwell Automation Technologies, Inc.


01/07/16
20160001665 
 Pulse width modulation resonance converter and charger for vehicle using the same patent thumbnailPulse width modulation resonance converter and charger for vehicle using the same
A pulse width modulation resonance converter is provided that includes a transformer and a switching unit including first to fourth switches electrically connected to a primary coil of the transformer and configured to convert a dc voltage into an ac voltage by a switching operation of the first to fourth switches in which each switch is switched from an off state to an on state when a voltage difference between both ends is about 0. Additionally, a rectifying unit includes an output capacitor, first to fourth diodes electrically connected to a secondary coil of the transformer, and a resonance tank having a resonance capacitor and a resonance inductor which are electrically connected to the secondary coil of the transformer.
Kia Motors Corporation


12/31/15
20150381067 

Multiple output converter and controlling the same


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


12/31/15
20150381039 

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


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


12/31/15
20150377933 

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


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


12/24/15
20150372513 

Multiple battery charger and controlling the same


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


12/17/15
20150365101 

Method and device for producing a digital signal


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


12/17/15
20150362545 

Fluorescent lamp testing device


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


12/10/15
20150359057 

Controller and dimming light-emitting diodes


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


12/10/15
20150357934 

Method and device for controlling an inverter


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


12/10/15
20150357915 

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


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


12/10/15
20150357902 

Voltage converter and voltage converting method


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


12/03/15
20150351190 

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


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


12/03/15
20150349767 

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


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


12/03/15
20150349654 

Voltage-adjusting device and method in power conversion system


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


11/26/15
20150340982 

Method and device for controlling an inverter


The invention relates to a method (40) 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 a corresponding plurality of freewheeling diodes (d) and being designed to provide a polyphase electric current (iu, iv, iw) and a polyphase voltage in the form of current space vectors (i*, u*), in particular to supply polyphase electric current (iu, iv, iw) to the electric machine (14). In said method, the inverter (10) is controlled to establish a plurality of different successive switching states (v0-v7) for the switches (s), and the inverter (10) is switched to an off-load switching state (v0, v7) by means of two switching states (v0, v7), a switch-on time (t0-t7) of the switching states (v0-v7) being varied according to a desired load value (m) for the switches (s) and/or for the freewheeling diodes (d), the desired load value (m) being set according to a temperature (ts, td) of at least one of the switches (s) and/or one of the freewheeling diodes (d)..
Robert Bosch Gmbh


11/26/15
20150340952 

Circuits and methods to linearize conversion gain in a dc-dc converter


Described examples include dc-dc power conversion systems, apparatus and methods for linearizing a dc-dc circuit conversion gain, including a gain circuit providing an output signal according to a gain value and the difference between a first compensation signal and a threshold signal, and a switching circuit selectively operative when the first compensation signal exceeds the threshold signal to linearize the conversion gain by providing a second compensation signal for pulse width modulation of at least one dc-dc converter switch according to the threshold signal and the gain circuit output signal.. .
Texas Instruments Incorporated


11/26/15
20150340942 

Switching mode power supply


A switching mode power supply, including a drive circuit, a low-pass filter, a feedback circuit, an operational amplifier, a reference voltage signal generation circuit, a comparator, a pulse width modulation (pwm) signal generation circuit, and a duty cycle detection circuit, where the duty cycle detection circuit is configured to convert a pwm signal that is output by the pwm signal generation circuit or a pulse output voltage signal that is output by the drive circuit into a triangular wave signal, and input the triangular wave signal to a negative input end of the comparator. The present invention is used to avoid using a complex collection circuit to collect a signal from an inductor, thereby reducing complexity of the switching mode power supply, decreasing a current collection time, and improving an operating frequency..
Huawei Technologies Co., Ltd.


11/26/15
20150336469 

System comprising a battery formed by battery modules, and corresponding connecting or disconnecting a battery module


A system and corresponding method, including a battery including a plurality of battery modules arranged in series, each module including a switch and a diode arranged in series and connected in parallel to the module. The system further includes a capacitor connected directly by an electrical connection to a point situated between the diode and the switch of each module, and directly to the negative terminal of the battery, and a load connected in parallel to the capacitor, a mechanism controlling each module switch using a pulse width modulation signal having a duty cycle that varies between 0% and 100%..
Renault S.a.s.


11/19/15
20150334796 

Method and system for improving led lifetime and color quality in dimming apparatus


In a pulse width modulation light emitting diode (led) controller an error amplifier and output load switch are synchronously controlled to prevent service life shortening current overshoot through the leds and slowing discharging currents causing color temperature shifting in the light output from the leds. A plurality of switching arrangements for the error amplifier and the compensation network may be provided in a single integrated circuit led dimming controller, and outputs for controlling a variety of differently configured output power switch combinations for disconnecting or shorting the leds, or disconnecting the output capacitor during off times of the modulated dimming control signal..
Microchip Technology Incorporated


11/19/15
20150333675 

Methods and systems to improve dc motor cooling fan efficiency with pulse width modulation frequency variation


Methods, systems and a vehicle are provided for. The method provides for controlling pulse width modulation by a transistor based on the speed of a motor and a transfer function.
Gm Global Technology Operations Llc


11/19/15
20150333669 

Hvac actuator with soft stall control


A actuator in a hvac system includes a motor and a drive device driven by the motor. The drive device is coupled to a movable hvac component for driving the movable hvac component between multiple positions.
Johnson Controls Technology Company


11/05/15
20150318803 

Hybrid pulse width modulation variable speed drive


A system or method controlling a variable speed drive based on pwm techniques, wherein a first pwm method is used when the input current is less than a predetermined threshold value, for higher efficiency and lower total harmonic distortion (thd); and a second pwm method comprising a discontinuous modulation signal is used when the input current is greater than the predetermined threshold value for higher efficiency. By doing so, the maximum efficiency of vsd within the whole operation range can be achieved..
Johnson Controls Technology Company


11/05/15
20150315040 

Apparatus with flow-through capacitors for the purification of a liquid and process for the purification of said liquid


Apparatus with flow-through capacitors for the purification of a liquid, which comprises: at least one cell (2) provided with at least one flow-through capacitor (4) provided with two or more electrodes facing each other, between which a liquid to be treated is susceptible to flow; electrical power supply means (13) adapted to supply a direct supply voltage (va); a modulation circuit (14) connected in input to the electrical power supply means (13) in order to receive the supply voltage (va) and provided with switches (22′, 22″; 23′, 23″) actuatable to apply at least one operating voltage between the facing electrodes of each capacitor (4). In addition, the present apparatus comprises a control circuit (24) which is connected to the switches (22′, 22″; 23′, 23″) of the modulation circuit (14), and is provided with a control module with pulse width modulation (pwm), which drives the switching of the switches (22′, 22″; 23′, 23″) by power supplying the facing electrodes of each capacitor (4) by means of a pulsed voltage having average value proportional to the aforesaid operating voltage..
Idropan Dell'orto Depuratori S.r.l.


10/29/15
20150311801 

Converter and method


In accordance with an embodiment, a dc-dc converter is provided comprising a single regulation loop that drives a control circuit, wherein the control circuit selects between operation in a pulse width modulation operating mode and a pulse frequency modulation operating mode, the single regulation loop including a compensation loop, and wherein biasing of the compensation loop is maintained in response to selecting between the pulse width modulation and the pulse frequency modulation operating modes.. .
Semiconductor Components Industries, Llc


10/29/15
20150311778 

Flyback power converter and control circuit and control method thereof


The present invention provides a flyback power converter and a control circuit and a control method thereof. The flyback power converter includes: a power stage circuit, a voltage sense circuit, a current sense circuit, and a control circuit.
Richtek Technology Corporation


10/29/15
20150309497 

Methods for consolidating module types for industrial control systems


A programmable discrete input module is described. In one or more implementations, the programmable discrete input module comprises a pulse width modulation module configured to generate a pulse width modulated signal based upon an input signal and a pulse width demodulation module configured to generate a demodulated pulse width signal.
Bedrock Automation Platforms Inc.


10/22/15
20150303885 

Class-d amplifier having mixed signal feedback control


A class-d amplifier includes an analog-to-digital converter (adc), a digital filter, a digital pulse width modulation (pwm) unit, a pre-driver unit, and an output driver. The adc is configured to receive an input signal and one or more feedback signals, and to generate a first digital signal.
Taiwan Semiconductor Manufacturing Company, Ltd.


10/22/15
20150303840 

Position corrected pulse width modulation for brushless direct current motors


A method of operating a brushless direct current motor is provided that generates a rotor position dependent pulse width modulation waveform. The waveform can improve motor efficiency and reduce torque variation..
Agave Semiconductor, Llc


10/22/15
20150303805 

An inductive load control circuit, a braking system for a vehicle and a measuring current in an inductive load control circuit


A method and circuit for controlling current through an inductive load such as an electromagnetic valve of a vehicle anti-lock braking system includes first and second driver stages, controlled by pwm (pulse width modulation) signals, for providing, respectively, an actuation path for valve current in an “on” phase and a recirculation path for valve current in an “off” phase. A peak value of current flowing in the actuation path at the end of an “on” phase is compared with a peak value of current flowing in the recirculation path at the start of the “off” phase in order to detect any malfunction of the circuit.
Freescale Semiconductor, Inc.


10/22/15
20150300944 

Pulse width modulation of continuum sources for determination of chemical composition


A light source and a method for its use in an optical sensor are provided, the light source including a resistively heated element. The light source includes a power circuit configured to provide a pulse width modulated voltage to the resistively heated element, the pulse width modulated voltage including: a duty cycle with a first voltage; and a pulse period including a period with a second voltage, wherein: the duty cycle, the first voltage, and the pulse period are selected so that the resistively heated element is heated to a first temperature; and the first temperature is selected to emit black body radiation in a continuum spectral range.
Halliburton Energy Services Inc.


10/15/15
20150296581 

Light emitting diode driving apparatus with variable output current and the same


A pulse width modulation control unit multiplies a value of a user side setting signal by a value of a dimming signal to obtain a pulse width modulation output current control signal. The pulse width modulation control unit sends the pulse width modulation output current control signal to a light emitting diode driving unit.

10/15/15
20150296577 

Ceiling fan device with led lamp


A ceiling fan device includes a ceiling fan provided with a light emitting diode (led) lamp, and an actuating and dimming integrator including an actuating and dimming integration circuit which includes an actuating circuit module, a regulating constant current circuit module, and a main control chip. The regulating constant current circuit module includes a first photovoltaic coupler, a digital/analogue (d/a) converter circuit, a comparator chip, and a sampling resistor.

10/01/15
20150280633 

System and controlling modulation of an inverter


A current measurement module is adapted to measure an observed current level for the inverter. A data processor or mode controller accesses a stored representation of first current level versus rotor speed output at which a total harmonic distortion level is less than threshold total harmonic distortion level.
Deere & Company


10/01/15
20150280622 

Method and device for operating an electronically commutated electric machine


The invention relates to a method for operating an electronically commutated electric machine (2), having the following steps: activating a driver circuit (3) in accordance with a commutation schema by switching power semiconductor switches (32, 33); applying a pulse width modulation to the switching of the power semiconductor switches (32, 33); and limiting a pulse control factor of the pulse width modulation to a pulse control factor threshold value.. .
Robert Bosch Gmbh


10/01/15
20150280619 

System and controlling modulation of an inverter


A current measurement module is adapted to measure an observed current level for the inverter. A data processor or mode controller accesses a stored representation of first current level versus rotor speed output at which a total harmonic distortion level is less than threshold total harmonic distortion level.
Deere & Company


10/01/15
20150280559 

Unified control scheme for non-inverting high-efficiency buck-boost power converters


Methods and apparatus relating to a unified control scheme for non-inverting high-efficiency buck-boost power converters are described. In an embodiment, compensator logic causes a buck-boost power converter to provide an output voltage with a higher voltage level than an input voltage in a boost operational mode of the buck-boost power converter and to provide the output voltage with a lower voltage level than the input voltage in a buck operational mode of the buck-boost power converter.

10/01/15
20150280485 

Fast charging apparatus


A fast charging apparatus includes a power conversion unit, a feedback module, a feedback adjustment module and a voltage mode fast charging signal processing module. The power conversion unit includes a pulse width modulation controller.
Chicony Power Technology Co., Ltd.


09/24/15
20150270777 

Master-slave digital voltage regulators


Described is an apparatus which comprises: a first bridge to be coupled to a first load; a first pulse width modulation (pwm) circuit to drive the first bridge; a second bridge to be coupled to a second load; and a second pwm circuit to drive the second bridge, wherein the first pwm circuit is controlled by a first digital word separate from a second digital word, wherein the second pwm circuit is controlled by the second digital, and wherein the second digital word is derived from the first digital word.. .

09/24/15
20150270770 

Systems and methods for mitigation of resistor nonlinearity errors in single or multiphase switching voltage regulators employing inductor dcr current sensing


Systems and methods for mitigation of resistor nonlinearity errors in a power converter are provided. In at least one embodiment, the power converter comprises at least one power switch coupled to an input voltage, a pulse width modulation (pwm) circuit for generating control pulses for the at least one power switch, at least one output inductor coupled to a respective one of the at least one power switches, a current sensor coupled in parallel with the at least one output inductor, and at least one circuit element.
Intersil Americas Llc


09/17/15
20150263645 

Pulse width modulation control for a multilevel converter


A method for controlling a switching device of a multilevel converter includes dynamically selecting a carrier and generating a switching signal to effect a switching event of the switching device based on a comparison of the dynamically selected carrier with a reference signal. The carrier is dynamically selected from a plurality of carriers, each corresponding to one of a plurality of contiguous bands into which range of a waveform of the reference signal is divided.
Siemens Industry, Inc.


09/17/15
20150263642 

Variable switching frequency power supply apparatus


A variable switching frequency power supply apparatus includes a main transformer, a voltage detection unit, a pulse width modulation control unit and a switch unit. The voltage detection unit is electrically connected to the main transformer.
Chicony Power Technology Co., Ltd.


09/17/15
20150263626 

Power converter package structure and method


An embodiment power converter package comprises a semiconductor die, an output inductor, a plurality of input capacitors and output capacitors. The semiconductor die, the output inductor and the plurality of capacitors are mounted on a lead frame and connected one to another through various pads on the lead frame.
Futurewei Technologies, Inc.


09/17/15
20150260671 

Electrical conductivity module


A driving circuit for a fluid conductivity sensor includes a pulse width modulation unit, an h-bridge, first and second differential amplifiers, and an analog-to-digital converter (adc). The pulse width modulation unit generates two opposing driving signals.
Atlas Scientific Llc


09/10/15
20150256159 

Load transient asynchronous boost for pulse width modulation modulator


A pulse width modulation controller (pwm) is disclosed which has a mosfet (15) responsive to the error voltage (verror) signal from the pwm amplifier (17) to detect a transient condition without delay Δtd. The mosfet drain generates and applies a detection signal (s) to a delaying circuit (d).
St-ericsson Sa


09/03/15
20150249446 

System, method and apparatus having improved pulse width modulation frequency resolution


Using a combination of frequency dithering of a pwm counter and a variable time delay circuit yields improved pwm frequency resolution with realizable circuit components and clock operating frequencies. A controllable time delay circuit lengthens a pwm signal during the first pwm cycle.
Microchip Technology Incorporated


09/03/15
20150249436 

Multi-stage amplifier with pulse width modulation (pwm) noise shaping


A pulse width modulation (pwm) amplifier includes a first amplifier stage, a second amplifier stage, and a gain module. The first amplifier stage is configured to amplify an analog input signal in the analog and digital domains using a first pulse width modulation (pwm) generator, to provide a first stage output for coupling to a load.
Taiwan Semiconductor Manufacturing Co., Ltd.


09/03/15
20150247755 

Pulse width modulation of continuum sources for determination of chemical composition


A light source and a method for its use in an optical sensor are provided, the light source including a resistively heated element. The light source includes a power circuit configured to provide a pulse width modulated voltage to the resistively heated element, the pulse width modulated voltage including: a duty cycle with a first voltage; and a pulse period including a period with a second voltage, wherein: the duty cycle, the first voltage, and the pulse period are selected so that the resistively heated element is heated to a first temperature; and the first temperature is selected to emit black body radiation in a continuum spectral range.
Halliburton Energy Services, Inc.


08/27/15
20150245438 

Pdm modulation of led current


A modulated current of an led device provides a capability to dim of the light produced by a string of led device. The current modulation takes the form of pulse width modulation (pwm) or pulse density modulation (pdm).
Dialog Semiconductor Gmbh


08/27/15
20150245038 

Methods and reduced bandwidth pulse width modulation


Methods and apparatus for reduced bandwidth pulse width modulation are disclosed. A system includes a digital controller circuit coupled to a data interface, the digital controller circuit configured to receive image data for display and further configured to encode line data for transmission to a spatial light modulator using a data compression scheme; and the spatial light modulator coupled to the data interface and configured to receive encoded data and to decode the encoded data to produce unencoded data corresponding to pixel data for display on an array of pixel elements in the spatial light modulator; wherein data transmitted from the digital controller circuit to the spatial light modulator further comprises encoded data that is formed from bit planes using a data compression scheme to form partial lines of data.
Texas Instruments Incorporated


08/27/15
20150244267 

Dc-dc converter and organic light emitting display device including the same


A dc-dc converter, including a conversion unit configured to convert a battery voltage input to an input terminal of the dc-dc converter into a first voltage, and to output the first voltage to an output terminal of the dc-dc converter, a feedback voltage generation unit configured to generate a feedback voltage by dividing the first voltage, an error amplifier (amp) configured to supply, to a pulse width modulation (pwm) control circuit, an error signal indicating a voltage difference between the feedback voltage and a reference voltage, the pwm control circuit being configured to control the conversion unit, corresponding to the error signal, thereby changing the first voltage, and a reference voltage supply unit configured to supply the reference voltage to the error amp, and to change the reference voltage.. .
Samsung Display Co., Ltd.


08/27/15
20150244249 

Inverter device and power converting method thereof


The invention is directed to an inverter device and a power converting method thereof. A control unit adjusts a pulse width modulation (pwm) signal serving to control power conversion of an inverter circuit according to a current harmonic component detected by a detection unit to generate an offset current to be superposed to an ac current output by the inverter circuit..
Fsp Technology Inc.


08/27/15
20150244161 

Fault detection circuit and fault detection method


A fault detection circuit includes a micro processing unit configured to output a first pulse width modulation (pwm) signal, a driver electrically coupled to the micro processing unit, and a comparator configured to electrically connect the micro processing unit and the driver. The first pwm signal is configured to drive the driver to output a second pwm signal configured to drive the electrical device.
Advanced Optoelectronic Technology, Inc.


08/20/15
20150237700 

Systems and methods to control color and brightness of lighting devices


Systems and methods are provided to control the color and brightness of led lighting. A control signal generator generates a hybrid control signal using pulse width modulation and analog control to drive an led driver with increased resolution to maintain color mixing while adjusting brightness of the led lighting..
Hunter Industries, Inc.


08/20/15
20150236628 

Discontinuous pulse width modulation


A discontinuous pulse width modulation technique is used in a controller to control an inverter that converts dc battery power to ac power to operate an electric motor, e.g., in a hybrid electric vehicle. The discontinuous pulse width modulation technique uses only one of the two zero state voltage vectors in its calculations whereas traditional pulse width modulation uses both zero state voltage vectors.
Ford Global Technologies, Llc


08/20/15
20150236618 

Systems and methods for space vector pulse width modulation switching using boot-strap charging circuits


Embodiments relate to systems and methods for space vector pulse width modulation switching using bootstrap charging circuits. Platforms and techniques are provided for controlling a power inverter using space vector pulse width modulation (pwm) operation.
Carrier Corporation


08/20/15
20150236581 

Total harmonic current distortion control circuit and method thereof


A total harmonic current distortion (thdi) control circuit includes a power factor correction circuit and a control circuit. The power factor correction circuit includes a boost unit, an inverter unit, and a feedback unit.
Voltronic Power Technology Corp.


08/13/15
20150229458 

Electric vehicle and service equipment on a pilot wire


Electric vehicle service equipment (evse) and electric vehicle (ev) are disclosed n. In an example embodiment, a modem is coupled to the pilot wire that couples the evse and the ev.
Texas Instruments Incorporated


08/13/15
20150229324 

Noise shaping for digital pulse-width modulators


A circuit includes an analog-to-digital converter (adc). The adc is configured to receive an analog feedback signal and an analog input signal and generate a digital output.
Taiwan Semiconductor Manufacturing Company, Ltd.


08/13/15
20150224332 

Laser therapy device


A laser therapy device that uses temperature sensing to provide clinical feedback and optical elements to produce a projection pattern for a given therapeutic application. Integrated thermal imaging provides the operator with visual representation of the tissue being treated.
Avant Wellness Systems


08/06/15
20150223307 

Theatrical effects controller with ultrasonic output


Provided is a system for controlling theatrical effects. The system comprises a console and one or more wireless controller devices.

08/06/15
20150222230 

Output power tuning using pulse position and pulse width control in a pulse position, pulse width modulation amplifier


An outphasing amplifier apparatus and method is disclosed that controls pulse width modulation and/or pulse height modulation to improve power-added-efficiency performance and/or compensate for errors caused by quantized pulse position settings is provided herein.. .
Auriga Measurement Systems, Llc


08/06/15
20150222217 

Travelling wave motor pre-driver using high resolution pwm generators


A motor driver combination for controlling a travelling wave motor includes a pre-driver including a microcontroller unit (mcu) chip including a plurality of high-resolution pulse width modulation (hrpwm) generators providing a frequency resolution better than ten hz. A digital bus is for transferring digital words received from a controller in a servo and velocity control block to the hrpwm generators, where the digital words provide travelling wave motor operating performance information from the motor during its operation.
Texas Instruments Incorporated


08/06/15
20150222190 

Power supply device and image forming apparatus having the same


A power supply device includes a transformer including primary winding and secondary winding, a sensor configured to sense at least one of output voltage and output current in the power supply device, a pulse width modulation (pwm) controller configured to perform pwm switching so that voltage is selectively provided to the primary winding based on one of the sensed output voltage and output current, and a regulator configured to stop pwm switching of the pwm controller and keep the pwm switching in stopped state when at least one of the sensed output voltage and output current exceeds a preset value.. .
Samsung Electronics Co., Ltd.


08/06/15
20150222186 

Adaptive critical-duty-cycle clamp for power converters


Devices and methods provide a duty cycle clamping device for preventing an output voltage of a power converter from decreasing as the duty cycle of a pulse width modulation (pwm) signal driving the power converter increases, the clamping device including duty cycle clamping circuitry configured to determine a critical duty cycle for the pwm signal based on an input voltage, a top voltage of a flying capacitor and a bottom voltage of the flying capacitor, and configured to clamp an actual duty cycle of the pwm signal at the critical duty cycle if a desired duty cycle exceeds the critical duty cycle.. .
Fairchild Semiconductor Corporation


07/30/15
20150215534 

Driver circuit for a camera voice coil motor


A driver circuit for a camera voice coil motor (vcm) is described. A first power switch selectively conducts current from a vcm node to a power supply node, and a second power switch selectively conducts current from the vcm node to a power return node.
Apple Inc.


07/30/15
20150214878 

Motor control device and detecting out-of-step


There is provided a motor control device for controlling a stepping motor having at least two coils. The motor control device includes a controller applies a pulse voltage being subjected to pulse width modulation to each of the coils and provides a stop period to a target coil being subjected to switching of a direction of the coil current, during which the application of the pulse voltage to the target coil is temporarily stopped.
Minebea Co., Ltd.


07/30/15
20150214873 

Method for diagnosing a frequency converter


A method for diagnosing a frequency converter is used for a frequency converter having a positive and negative dc link voltage which is applied via bridges of switching elements in an alternating sequence to phases of a motor. pulse width modulation (pwm) signals drive the switching elements for a respective one of the phases and current sensors capture phase currents.
Dr. Johannes Heidenhain Gmbh


07/30/15
20150211925 

Recording illumination


Systems and methods permit use of efficient solid state emitters for broad spectrum continuous spectrum lighting defined by illumination data. The illumination data, which can be sold as a commercial product, can be recorded or authored and include spectral, temporal, and spatial information.
Telelumen, Llc


07/23/15
20150208491 

Accent lighting system


Apparatus for illuminating an object with light that is controlled for intensity and color temperature. A ceiling mounted luminaire contains a circuit that controls the intensity and color temperature of light emitting diodes (leds).
Method Lights, Llc


07/23/15
20150207498 

Pwm modulator


A method is for reducing pulse skipping from a characteristic affecting a modulating signal input to an integrator of a pulse width modulation (pwm) modulator, together with a square wave carrier signal for generating a triangular waveform of the pwm modulator. The method may include creating a broad synchronous peak at vertexes of the triangular waveform output by the integrator..
Stmicroelectronics S.r.i.


07/23/15
20150207395 

Method for controlling the current intensity of the electric current flowing through an inductive consumer and a corresponding circuit configuration


A method is provided for controlling the current intensity of the electric current flowing through an inductive consumer, the consumer being connected in series to a switching device and a current measuring unit, and in parallel to a free-wheeling element, and the switching device being activated for adjusting the current intensity during a pulse width modulation period. It is provided that a mean load voltage to be set during the pulse width modulation period is determined from an input current intensity with the aid of a first controller, the mean load voltage being set in the pulse width modulation period with the aid of the switching device at the consumer, the mean load voltage or a setpoint load voltage determined with the aid of a second controller from a predefined setpoint current intensity being fed to a model adapted to the consumer, and the input current intensity being ascertained from the difference between the predefined setpoint current intensity and a difference variable between an actual current intensity through the consumer and a model current intensity determined with the aid of the model.
Robert Bosch Gmbh


07/23/15
20150205239 

Induction heating fusing device and image forming apparatus


An induction heating fusing device and an image forming apparatuses that may control even a very small current region by tracking a resonance frequency to perform pwm control and phase control without considering a deviation of a part constant or a temperature change are provided. The induction heating fusing device includes: a serial resonance circuit having an induction coil and a condenser; a phase comparator, a phase controller, a resonance frequency tracking oscillator, and a pwm (pulse width modulation) signal generator.
Samsung Electronics Co., Ltd.


07/16/15
20150200602 

Multilevel converter systems and methods with reduced common mode voltage


Sinusoidal pulse width modulation (spwm) control techniques, computer readable mediums, and apparatus are presented for operating a multilevel converter, in which a desired ac node voltage level is determined through comparison of a plurality of carrier signals or values to at least one reference signal or value, and a switching state is selected from a plurality of redundant switching states corresponding to the desired ac node voltage level for generating switching control signals based at least partially on a switched capacitor voltage balancing goal or other control objective.. .
Rockwell Automation Technologies, Inc.


07/09/15
20150194920 

Motor controller maximizing energy savings


A motor controller and method for maximizing the energy savings in an ac induction motor at every load wherein the motor is calibrated at two or more load points to establish a control line, which is then programmed into a non-volatile memory (30) of the motor controller. A dsp-based closed-loop motor controller observes the motor parameters of the motor such as firing angle/duty cycles, voltage, current and phase angles to arrive at a minimum voltage necessary to operate the motor at any load along the control line.
The Powerwise Group, Inc.


07/09/15
20150194916 

Apparatus for driving motor and controlling method thereof


Embodiments of the invention provide an apparatus for driving a motor, in which the apparatus includes a rectifier configured to rectify an input voltage to generate a driving voltage, and a motor driver configured to apply the driving voltage to the respective phases of the motor through a switching operation. The apparatus further includes a controller configured to control a pulse width modulation signal for controlling the switching operation of the motor driver, to decide whether or not driving of the motor is stopped depending on whether or not an over-voltage is generated in the input voltage based on an output voltage sensed by the rectifier and to decide whether or not the motor is again driven or whether or not the driving of the motor is completely stopped by deciding whether or not the input voltage returns to a normal voltage or whether or not the over-voltage is again generated within a predetermined time according to the number of generated over-voltages..
Samsung Electro-mechanics Co., Ltd.


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


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.
Valeo Equipements Electriques Moteur


07/02/15
20150188465 

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.
Silicon Laboratories Inc.


07/02/15
20150188453 

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).. .
Robert Bosch Gmbh


07/02/15
20150188424 

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.
Atmel Corporation


07/02/15
20150188412 

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.. .
Rohm Co., Ltd.


07/02/15
20150188362 

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.
Inertech Ip Llc


06/25/15
20150180391 

Motor 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


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


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


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.




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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