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Pulse Width Modulation patents


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new patent Image processing method and image processing system assigning different gains to different sections
The present invention discloses an image processing method and an image processing system adopting the same. The method includes the steps of: (a) obtaining a pixel array representing an image; (b) segmenting the pixel array into two or more non-overlapping regions; (c) identifying a capacitor discharging rate of each of the regions; (d) generating a pulse width modulation (pwm) signal when a voltage level dropping of a capacitor exceeds a predetermined threshold; and (e) applying exposure parameters to the regions according to the capacitor discharging rate of the regions, respectively, wherein the exposure parameter applied to one of the regions is different from the exposure parameter applied to at least another one of the regions..
Pixart Imaging (penang) Sdn. Bhd.

Flyback-based power conversion apparatus
A power conversion apparatus including a flyback power conversion circuit, a control chip and a detection auxiliary circuit is provided. The flyback power conversion circuit converts an input voltage into a direct current (dc) output voltage.
Power Forest Technology Corporation

Output current monitor circuit for switching regulator
A circuit and method for providing an improved current monitoring circuit for a switching regulator. A circuit providing switching regulation with an improved current monitor, comprising a pulse width modulation (pwm) controller configured to provide p- and n-drive signals, an output stage connected to said pwm controller and configured to provide switching, comprising a high-side and low-side transistor, driven by said p- and n-drive signals, respectively, a sense circuit configured to provide output current sensing from the output stage during a sampling period when the n-drive signal is active, and a sampling timing generator configured to provide a an n-sampling signal, nsample, to the sense circuit, wherein a start of the n-sampling signal is delayed by a first delay after the sampling period and the n-sampling signal is ended prior to an end of the sampling period by a second delay..
Dialog Semiconductor (uk) Limited

Lighting device, vehicle illumination device, and vehicle
The lighting device includes a control circuit performing dimming control of dimming a light source device according to a desired dimming level. In the dimming control, the control circuit sets a desired current value of amplitude control to a value corresponding to the desired dimming level, and set a desired duty cycle of pulse width modulation control to a predetermined value associated with a dimming subrange containing the desired dimming level, of multiple different dimming subranges of a total dimming range of the light source device.
Panasonic Intellectual Property Management Co., Ltd.

Programmable led driver, monitor and setting devices
Led driver apparatus and methods may include a sensing circuit for adjusting an output based on either a pulse width modulation dimming control or an analog dimming control. An led driver apparatus and methods may also include a sensor for a parameter such as temperature and for recording such parameter, for example as a function of time.
Fulham Company Limited, An Exempted Co. Inc'd W/ Limited Liability Under The Laws Of The Cayman Isl

Modular multilevel converter leg with flat-top pwm modulation, converter and hybrid converter topologies
A voltage source converter for interconnecting first and second electrical networks, including first and second terminals for connection to the first electrical network, and a primary converter limb extending between the first and second terminals including first and second primary limb portions separated by a third terminal connectable to the second electrical network. The converter further including a second chain-link converter connected to the third terminal and a control unit configured to selectively operate one or more chain-link modules to generate a discontinuous pulse width modulation voltage waveform.
General Electric Technology Gmbh

Control of a startup circuit using a feedback pin of a pwm controller integrated circuit chip
A power supply includes a control transistor that controls a primary winding of a transformer to induce current on a secondary winding of the transformer to generate an output voltage. A pulse width modulation (pwm) controller integrated circuit (ic) chip drives the control transistor through a gate pin.
Fairchild Semiconductor Corporation

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

Power supply avoiding audio noise and power supply avoiding audio noise
A power supply apparatus (10) includes a voltage input side (102), a power switch circuit (104), a voltage output side (106), a pulse width modulation signal generating circuit (108) and a burst frequency detection circuit (110). According to a pulse width modulation signal (114), the pulse width modulation signal generating circuit (108) controls the power switch circuit (104), so that the power supply apparatus (10) enters a burst mode.
Chicony Power Technology Co., Ltd.

A pixel circuit, display panel and driving method thereof
The present disclosure provides a pixel circuit, a display panel and a driving method thereof. The pixel circuit comprises a charging module, a light-emitting device and a capacitor.
Boe Technology Group Co., Ltd.

Sensor device and sensing method using the same

Provided are a sensor device and a sensing method using the same. The sensor device according to the present invention includes: a sensing voltage generating unit outputting different voltage values depending on an external environment; a pulse generating unit generating a pulse having a period which is proportional to an input voltage; a divider dividing an output of the pulse generating unit; and a counter unit measuring a length of an output pulse of the divider in a clock unit.

Motor speed curve control circuit and moter thereof

The present disclosure illustrates a motor speed curve control circuit. The motor speed curve control circuit is configured for adjusting a speed of a motor according to a motor speed curve.
Anpec Electronics Corporation

Electric motor and motor control

Various embodiments of an electric motor and electronic control for an electric motor are disclosed. An exemplary electric motor comprises a single-phase brushless permanent magnet electric motor.
Nidec Motor Corporation

Motor driver of motor for valve timing control of internal combustion engine

A motor driver for driving a motor in a valve timing controller of an internal combustion engine, including an electronic driver unit (edu) that, upon receiving a target rotation cycle as the instructed rotation cycle, instructs a rotation controller to (i) calculate a duty value of a pulse width modulation (pwm) signal for driving the motor based on an instructed rotation cycle and an actual rotation cycle and (ii) output a calculation result of the duty value to a motor drive unit, with the rotation controller outputting, to the motor drive unit, an instruction signal that rotates the motor forward along an actual rotation direction, when the calculation result takes a positive value as a duty ratio of the pwm signal, establishing an accurate motor rotation speed control together with an improved responsiveness.. .
Denso Corporation

Voltage regulator current load sensing

A dc-dc converter including digital circuitry for determining load current supplied to a load. In some embodiments the digital circuitry determines the load current differently based on whether the dc-dc converter is operating in pulse frequency modulation mode or pulse width modulation mode.
Endura Ip Holdings Ltd.

Dc-dc converter having digital control and reference pwm generators

A dc-dc converter operating in pulse frequency modulation (pfm) and pulse width modulation (pwm) modes includes a plurality of pwm signal generators. The pwm signal generators generate pwm signals with different duty cycles.
Endura Ip Holdings Ltd.

Liquid crystal display

A liquid crystal display includes: a liquid-crystal-display device; a display control circuit; a backlight device; and a light-emitting-diode control circuit that adjusts luminance of the backlight device using a pulse width modulation signal as an output to the white light emitting diode. Gradation correction data corresponding to a chromaticity variation due to a duty ratio of the pulse width modulation signal is stored in the display control circuit in advance, the display control circuit determines the gradation correction data corresponding to input image data input to the liquid crystal display, based on the input image data and the duty ratio, and the display control circuit outputs output image data, which is calculated so as to correct the chromaticity variation based on the gradation correction data and the input image data, as the image signal to the liquid-crystal-display device..
Mitsubishi Electric Corporation

Data transmission method

Described are, among other things, a method and a receiver for receiving a management data signal in an optical transmission system where a traffic data signal is transmitted as a nrz modulated signal. The traffic data signal has a management data signal superimposed thereon as a pulse width modulation of the symbols of the nrz modulated signal.
Transmode Systems Ab

Digital pulse width modulation control for load switch circuits

Example implementations relate to controlling a field-effect transistor (fet) switch in a load switch circuit. A digital pulse width modulated (pwm) voltage signal may be applied to a gate of a fet switch.
Hewlett-packard Development Company, L.p.

Control circuit for buck-boost power converter with seamless mode transition control

A buck-boost power converter and a control circuit for the buck-boost converter. The control circuit includes a buck cycle pulse width modulation module and a boost cycle pulse width modulation module respectively having a first controllable hysteresis and a second controllable hysteresis.
Monolithic Power Systems, Inc.

Green power converter

A green power converter which omits the pulse width modulation (pwm) technique in the traditional power converter, does not have high-frequency power device, does not generate emi interference, simultaneously adopts the symmetry basic primitive (sbp) technique, the amplitude high modulate (ahm) technique and the dynamic rectification (dr) technique, and only needs to perform traditional power conversion on a small part of the input power so as to acquire the whole output power, namely that a large part of the output power neither need traditional power conversion nor need to pass through a magnetic core transformer. The input ac voltage neither needs to be rectified and filtered nor has large inductance and large capacitance, thus the power factor is 1, and the total harmonic distortion (thd) is 0.

Control circuit for fan and electronic system utilizing same

A control circuit for a fan of an electronic system includes a temperature sensor detecting temperature in the electronic system, a connector electrically coupled to the fan, and a control chip electrically coupled to the temperature sensor and the connector to obtain instant temperature and rotational speed. Through the connector, the control chip outputs a first pulse width modulation (pwm) signal configured to adjust duty ratio of the first pwm signal.
Hon Hai Precision Industry Co., Ltd.

Power supply management circuit utilizing multistage activation and related management method

A management circuit for a power supply is provided. The power supply includes a power factor correction circuit and a power conversion circuit.
Fsp Technology Inc.

Phase controller apparatus and methods

A phase controller includes a plurality of pulse width modulation (pwm) circuits, a plurality of switching devices, a computing unit, and a latency generator. The plurality of pwm circuits output pulse signals.
Cypress Semiconductor Corporation

Circuit and pulse width modulation

A delta-sigma modulator circuit comprising: an integrator circuit configured to produce an integrator output signal that represents an integration of an analog input signal, a comparator output signal and a periodic signal; a comparator circuit configured to produce the comparator output signal in response to a comparison of the integrator output signal with a first reference signal; and a periodic signal generation circuit configured to produce the periodic signal.. .

Switched power converter with improved synchronization of a pulse width modulation switching frequency

Power converter includes a switched power stage to generate an output voltage from an input voltage, and a controller to generate a pulse width modulation (pwm) signal for switching the switched power stage in dependence upon a voltage error signal. The voltage error signal is a difference between a reference voltage and the output voltage.
Zentrum Mikroelektronik Dresden Ag

Power switching circuit and controlling same

A power switching circuit and a method for controlling the same are disclosed herein. The power switching circuit includes a frequency control circuit, a pulse modulation circuit, and a switching convertor.
Silicon Works Co., Ltd.

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

An electronic device disclosed herein includes a current comparator to generate an output current based upon a difference between a current flowing in an output branch and a current flowing in an input branch. A pair of transistors is coupled to an output of the current comparator.
Stmicroelectronics (shenzhen) R&d Co. Ltd

Communication devices

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

Power conversion device

A power conversion device includes: a plurality of 3-level converters (31 to 35) that are multiple-connected in series to an ac power supply; and a control device (10) controlling operations of the plurality of 3-level converters (31 to 35). The control device (10) includes: a calculation unit calculating an output voltage command for the plurality of 3-level converters (31 to 35); a carrier signal generation unit generating a carrier signal; a correction unit correcting a phase of the carrier signal based on a potential variation on a dc neutral point bus (7); and a pulse width modulation control.
Toshiba Mitsubishi-electric Industrial Systems Corporation

Wireless power transfer device and wireless power transfer system

A wireless power transfer system according to an embodiment of the present invention is a wireless power transfer system having a receiving part for receiving power from a transmitting part, wherein the transmitting part comprises: a power conversion part comprising a full bridge inverter; and a control part for controlling the power conversion part using a pulse width modulation (pwm) control signal, the duty ratio of the pwm control signal being determined by a duty ratio in which the ratio of the magnitude of harmonics to the magnitude of a fundamental frequency among frequency components of the output signal of the power conversion part is a minimum.. .
Lg Innotek Co., Ltd.

Driving circuit of light source and control circuit thereof, driving light source, lighting apparatus, and electronic device

A control circuit of a driving circuit for supplying a driving current to a light source includes: a pulse width modulation (pwm) input terminal configured to receive an input dimming pulse having an input duty ratio corresponding to a target light quantity of the light source, the input dimming pulse being pulse-width modulated; and a dimming controller configured to convert a period and a pulse width of the input dimming pulse into digital values, reconvert the digital values into an output dimming pulse having an output duty ratio which is the same as or different from the input duty ratio, and control the driving current to be on and off based on the output dimming pulse.. .
Rohm Co., Ltd.

Flyback converter, control circuit and control method therefor

The disclosure relates to a flyback converter, a control circuit and a control method therefor. In the control method, a power stage circuit is controlled at a light load to operate alternatively in a pulse width modulation mode (i.e.
Silergy Semiconductor Technology (hangzhou) Ltd.

Power supply apparatus and power processing method

Determine the duty cycle of the pulse width modulation signal to derive the voltage value of the alternating current voltage when the power supply is in the peak power working status. The voltage value of the alternating current voltage is determined as high if the duty cycle of the pulse width modulation signal is lower than the predetermined duty cycle.
Power Forest Technology Corporation

Localized power point optimizer for solar cell installations

In one embodiment, a solar cell installation includes several groups of solar cells. Each group of solar cells has a local power point optimizer configured to control power generation of the group.
Sunpower Corporation

Motor drive circuit and method

In accordance with an embodiment, a method for driving a motor includes determining a position of a first pole of a rotor of the motor relative to a position of a hall sensor. A drive signal is generated in response to the position of the first pole of the rotor of the motor, the drive signal having a duty in accordance with the duty control signal or a second duty control signal.
Semiconductor Components Industries, Llc

Power supply circuit for reducing standby power and control method thereof

A power supply circuit and method for driving an electronic device that operates in a first mode or a second mode is provided. The power supply circuit includes a pulse width modulation (pwm) controller configured to convert an input voltage to an output voltage, and a driving circuit that includes a switching element whose switching state is controlled in accordance with a mode change signal corresponding to the first and second modes.
Samsung Electronics Co., Ltd.

High voltage protection system for adjusting duty cycle by using pulse width modulation signal

A high voltage protection system includes a high voltage processing circuit, a pulse width modulation signal outputting circuit, a driving circuit, and a coil module. The high voltage processing circuit is used for receiving and processing a high voltage.
Prolific Technology Inc.

Distributed feeding device and control system of model vehicle

To suppress unintended rapid acceleration of a vehicle and the like while suppressing a wire length of a feeding system in the entire layout in section-divided feed using pulse width modulation. A clock generation unit included in a feeding device generates an internal clock having a phase aligned based on a reset signal supplied from a higher-level device that controls a vehicle speed of the vehicle, the reset signal being commonly supplied to another feeding device.
Tomy Tec Co., Ltd.

Light-emitting diode driving apparatus

Provided is a light-emitting diode driving apparatus, including: a switching transistor which becomes an on-state or an off-state in response to a pulse width modulation signal; a light-emitting diode electrically connected with a second terminal of the switching transistor; a first comparison circuit which outputs a first voltage depending on a comparison result between a first input voltage corresponding to a voltage applied to the light-emitting diode and a first threshold voltage; a second comparison circuit which outputs a second voltage depending on a comparison result between a second input voltage corresponding to a voltage applied to the light-emitting diode and a second threshold voltage; and a signal processing circuit which detects a failure in the light-emitting diode on the basis of an output state of the pulse width modulation signal, the first voltage, the second voltage and a third voltage on the second terminal side of the switching transistor.. .
Kabushiki Kaisha Tokai Rika Denki Seisakusho

Differentiated control the cascaded active power filter

The present invention relates to a differentiated control method of the cascaded active power filter, wherein the cascaded links are divided into low frequency links and high frequency links; wherein low frequency links are used to generate the fundamental voltage generated by the cascaded multilevel converter; wherein high frequency links are used to produce different, separate voltage from the aforementioned fundamental voltage generated by the cascaded multilevel converter; wherein according to the given cycle, some links are selected circularly from cascaded links as the high frequency links; wherein in the control cycle, each phase links with the maximum and minimum dc capacitor voltage, as well as those links that the pulse width modulation (pwm) combination discharge and charge most to dc capacitor are found out.. .

System and controlling ldc of hybrid vehicle

A system and a method for controlling a low voltage dc/dc converter (ldc) of a hybrid vehicle is provided in which a fuel efficiency mode for artificially turning off pulse width modulation (pwm) control of the ldc is added, thereby improving fuel efficiency. Accordingly, the fuel efficiency mode for artificially turning off the pwm control of the ldc is added, so that when the fuel efficiency mode is performed, power of an auxiliary battery is temporarily supplied to an electric field load, thereby reducing power consumption of a main battery and improving fuel efficiency.
Hyundai Motor Company

Electro-hydraulic servo valve control system

A control system includes an electro-hydraulic servo valve configured to move about a plurality of positions in response to receiving an analog bi-polar current signal. An electronic field programmable gate array (fpga) generates first and second digital pulse width modulation (pwm) signals according to an adjustable duty cycle.
Goodrich Corporation

Method and calculating an average value of an inaccessible current from an acessible current

In a power converter, a circuit determines an average value of an inaccessible current from an average value of an accessible current and a value of the operating duty cycle of the converter. A method of measuring an average value of an inaccessible current from a measured value of a current in a power converter by a duty cycle of a pulse width modulation (pwm) signal representing a duty cycle of the power converter.
Texas Instruments Incorporated

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

Universal system structure for low power adapters

A two-stage power converter architecture including an isolation transformer and rectification of the isolation transformer output by an llc resonant circuit and methodology for operating the same feeds an output voltage back to a circuit for generating waveforms for controlling a totem pole circuit to provide output voltage regulation as well as rectification of ac input voltage. The circuit for controlling the totem pole circuit may also be responsive to the ac input power waveform to provide power factor correction (pfc), in which case, the feedback signal provides additional pulse width modulation of the pfc signals.
Virginia Tech Intellectual Properties, Inc.

Enhanced variable control, current sensing drivers

An electronic lighting system with a driver includes transformers that are dedicated to particular lamp receptacles that include interloper diode and resistor sets that fine tune the functioning of the driver. A buck converter and power factor correction, and a zeta scan are included.
Green Clean Scientific, Inc.

Artificial ripple modulation control circuitry

In one embodiment the present disclosure provides a power supply system that includes power switch circuitry configured to switch an input voltage to generate a switched input voltage; output circuitry including an inductor to generate an output voltage from the switched input voltage; and pulse width modulation (pwm) controller circuitry configured to generate a pwm signal to control the power switch circuitry; wherein the pwm controller circuitry is further configured to turn off the pwm signal based on a ramp signal that emulates, at least in part, current of the inductor and a feedback signal indicative of an error between the output voltage and a reference voltage.. .
Fairchild Semiconductor Corporation

Multiple evaporator control using pwm valve/compressor

A refrigeration system including a condenser; a (single) linear compressor that is activated and deactivated by a pulse width modulation switching device; a pulse width modulation refrigerant flow switch; at least two evaporators operably connected in parallel with one another with at least one evaporator associated with the refrigerator compartment that operates at a first refrigerant fluid pressure and with at least one other evaporator associated with the freezer compartment that operates at a second refrigerant fluid pressure; and a plurality of refrigerant fluid conduits operably connecting the condenser, the linear compressor and the evaporators into a refrigerant fluid flow circuit and such that the evaporators are capable of running simultaneously at different pressure levels and refrigerant flows from the evaporators, to the pulse width modulation refrigerant flow switch and through the pulse width modulation refrigerant flow switch.. .
Whirlpool Corporation

Voltage control at low temperature to avoid undervoltage switch-offs in battery-powered, hand-operated electric tools

An electric tool is disclosed. The tool includes an electric motor, a battery, a monitoring device for monitoring a monitoring operation-value limit, where the monitoring operation-value limit lies above an operation-value limit of the battery, an adjustable resistor component, and an operation-value controller for setting at least one operation-value of the electric motor by a pulse width modulation (pwm) duty cycle.
Hilti Aktiengesellschaft

Light source driving circuit and method

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

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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    This listing is a sample listing of patent applications related to Pulse Width Modulation for is only meant as a recent sample of applications filed, not a comprehensive history. There may be associated servicemarks and trademarks related to these patents. Please check with patent attorney if you need further assistance or plan to use for business purposes. This patent data is also published to the public by the USPTO and available for free on their website. Note that there may be alternative spellings for Pulse Width Modulation with additional patents listed. Browse our RSS directory or Search for other possible listings.


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