This page is updated frequently with new Pulse Width Modulation-related patent applications.
|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
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.
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.
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.. .
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.
Light source driving circuit and method
The present invention provides a light source driving circuit and method. The light source driving circuit is used to provide light source driving signals to a light source.
Shenzhen China Star Optoelectronics Technology Co., Ltd.
Time signal generating circuit and time signal generating method
A time signal generating circuit and a time signal generating method are provided. The time signal generating method includes following steps: receiving a feedback voltage and a reference voltage to provide a first control signal, wherein the feedback voltage is related to an output voltage of a power converter; receiving an input voltage and a default voltage to provide a second control signal; and adjusting an on-time of a pulse width modulation signal according to the first control signal and the second control signal..
Upi Semiconductor Corp.
Method and system for control of contactor
A method and system for controlling one or more contactors of a rechargeable energy storage system (ress) includes adjusting, via a controller, the respective actuating power provided to a respective one or more of the contactors, where adjusting of the actuating power is defined by the energized or non-energized condition of the vehicle and at least one parameter affecting holding and opening forces exerted on the respective contactor. In an example, the controller is configured to use feed forward factors defined by the at least one parameter and to adjust the dynamic actuating current by modulating the dynamic actuating current at a pulse width modulation (pwm) frequency defined by a feed forward window.
Gm Global Technology Operations Llc
Method and system for providing pulsed power and data on a bus
A method and system for providing pulsed power and data from a main control unit to slave units via a first bus. The main control unit has an ac signal generator for providing a plurality of first pulses (p1) on the bus for providing the power to the slave units.
Vlaamse Instelling Voor Technologisch Onderzoek (vito) Nv
Combinatorial/sequential pulse width modulation
A number of standard pwm generators produce pwm signals that may be used to drive the power stages for full-bridge, feed-forward, push-pull, phase-shift zero voltage transition (zvt), and other switched mode power supply (smps) conversion topologies. These pwm signals may be fed to logic functions of a combinatorial logic block.
Microchip Technology Incorporated
Three input comparator
A three input voltage comparator provides termination of a pulse width modulation (pwm) output in a switched mode power supply. Shutdown of the pwm signal occurs when a sense current from the switching transistors exceeds either or both of the limit and error current references.
Microchip Technology Incorporated
Switched power converter with dual mode pwm / cot control
A power converter includes a switched power stage configured to generate an output voltage from an input voltage and a controller configured to generate a pulsed control signal for switching the switched power stage in dependence upon a voltage error signal. The voltage error signal is a difference between a reference voltage and an output voltage.
Zentrum Mikroelektronik Dresden Ag
Buck power stage with multiple mosfet types
A buck voltage converter is disclosed. The buck voltage generator includes a controller configured to generate one or more pulse width modulation (pwm) signals, and a plurality of serially connected switches configured to receive the pwm signals and to generate an output voltage signal at an output terminal based on the received pwm signals.
Pulse width modulation (pwm) driving scheme and bezel reduction
This application sets forth a circuit configuration for a light emitting diode (led) or organic light emitting diode (oled) display. The circuit configuration allows for the pulse-width modulation (pwm) of each emission signal sent to each line of the display.
Engine start and battery support module
An engine start and battery support module (or a vehicle is provided that utilizes a bank of ultra capacitors (ucs) charged with or without running the vehicle's alternator to levels that support both engine starting assistance and hotel load support. The ucs' per-cell charge can be adjured and raided during periods of low temperatures and even higher during ultralow temperatures.
Amplifiers for parametric loudspeakers
Systems and methods of audio processing and control for improved audibility and performance in a parametric loudspeaker system. The parametric loudspeaker system includes a parametric loudspeaker providing a capacitive load, an output stage having a plurality of switches interconnected in a bridge configuration and connected to the capacitive load of the parametric loudspeaker, and a controller operative to generate a series of pulse width modulation (pwm) pulses, and to generate a plurality of control signals synchronized with the series of pwm pulses for switchingly controlling the plurality of switches in the bridge configuration, thereby driving the capacitive load of the parametric loudspeaker..
System and controlling forward/reverse rotation of fan
A control system includes a motor, an interface circuit, a motor controller and a detection control circuit. The interface circuit receives and converts a pulse width modulation signal.
Delta Electronics, Inc.
Utilization of different loudness encoding schemes in cochlear implant systems
An exemplary sound processor included in a cochlear implant system associated with a patient may 1) identify a loudness level of an audio signal presented to the patient, 2) determine that a stimulation pulse amplitude corresponding to the loudness level is greater than a maximum stimulation pulse amplitude allowed by a compliance voltage associated with a cochlear implant implanted within the patient, and 3) direct, in response to the determination that the stimulation pulse amplitude is greater than a maximum stimulation pulse amplitude allowed by the compliance voltage, the cochlear implant to represent the loudness level to the patient by directing the cochlear implant to generate and apply one or more stimulation pulses to the patient in accordance with at least one of a first encoding scheme that includes pulse density modulation and a second encoding scheme that includes a combination of pulse amplitude modulation and pulse width modulation.. .
Advanced Bionics Ag
Pulse width modulation
A device includes a combining circuitry that receives an incoming signal, and one or more delayed signals from a delay circuitry. The combining circuitry combines the incoming signal and the one or more delayed signals to generate a combined signal.
Marvell World Trade Ltd.
Increasing pwm resolution for digitally controlled motor control applications
Systems and methods for increasing pulse width modulation (pwm) resolution for digitally controlled motor control applications are described. For example, in some embodiments, a method may include receiving a clock signal having a given period; identifying a target duty cycle; calculating a comparison point based upon the given period and the target duty cycle; generating a pwm signal based upon the clock signal using the comparison point; and varying the comparison point to increase a resolution of an effective duty cycle of the pwm signal..
Texas Instruments Incorporated
Bidirectional electrical signal converter
A bidirectional ac-to-dc and dc-to-ac circuit includes a first inductor-capacitor (lc) circuit connected to an ac power source, a transistor synchronized with the ac power source signal, a second lc circuit electrically connected to the synchronized transistor and the first inductor-capacitor circuit, a high-frequency switching transistor electrically connected to the second inductor-capacitor circuit and a direct current (dc) load, and a controller connected to the high-frequency switching transistor. The controller identifies an error between a measured dc output signal and a predetermined dc output signal that is applied to the dc load, and adjusts a duty cycle of a pulse width modulation (pwm) switching signal for the high-frequency transistor to reduce the identified error..
Indiana University Research And Technology Corporation
Power converter with adaptive zero-crossing current detection
A power converter with adaptive zero-crossing current detection is provided. The power converter includes a first transistor, a second transistor, a pwm (pulse width modulation) controller, a low-pass filter, and a delay controller.
Power conversion device and driving the same
A power conversion device includes: a first dc-dc converter configured to receive a first power from a first dc power source and to convert at least one of a voltage level and a current level to generate a first converted power; a dc-ac inverter electrically coupled to the first dc-dc converter and configured to convert the first converted power into a first ac power and to provide the first ac power to an external device; and a control unit configured to control the first dc-dc converter and the dc-ac inverter, wherein the first dc-dc converter and the dc-ac inverter are configured to be driven according to pulse width modulation (pwm) scheme using a first carrier frequency and a dc-ac carrier frequency, respectively, wherein a level of the first carrier frequency and a level of the dc-ac carrier frequency are determined according to predetermined time periods.. .
Samsung Sdi Co., Ltd.
Display device and driving backlight thereof
A display device and a method for driving a backlight thereof are provided. The display device includes a signal generator configured to generate a first pwm (pulse width modulation) signal and a second pwm signal, a low current driver configured to generate first output current using the first pwm signal, a high current driver configured to generate second output current using the second pwm signal, and a backlight configured to be driven by at least one of the first output current generated by the low current driver and the second output current generated by the high current driver.
Samsung Electronics Co., Ltd.
Configurable serial and pulse width modulation interface
A reconfigurable register device includes an arrangement of storage elements arranged sequentially in a chain structure. Each storage element stores a state of a binary signal.
Freescale Semiconductor, Inc.
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 .
Wireless controlling voltage supplied to amplifier unit
Provided is a technique for effectively implementing dc removal during switching of transmission scheme or transmission data in a wireless apparatus equipped with a function for supplying a voltage to a power amplifier by et control. When the et control is not carried out in a power supply unit, more specifically, when an iq signal is not present, a control unit outputs a pulse width modulation (pwm) signal for a fixed voltage via a switch unit.
Hitachi Kokusai Electric Inc.
Demodulation circuit and wireless charging device having the same
The present disclosure illustrates a demodulation circuit disposed in a wireless charging device. The demodulation circuit comprises a detection unit, a delay unit and a demodulation unit.
Anpec Electronics Corporation