|| List of recent Pulse Width Modulation-related patents
| Apparatus for providing transient thermal profile processing on a moving substrate|
A method and apparatus for thermally processing material on a low-temperature substrate using pulsed light from a flash lamp is disclosed. Material is conveyed past the flash lamp.
Ncc Nano, Llc
| Communication system|
A communication system performs communication using a pulse width modulation code as a transmission code. The communication system includes a plurality of nodes that are connected via a transmission line to be capable of communicating with each other.
| Driving circuit and driving light emitting diode and display apparatus using the same|
The present invention provides a driving circuit and a driving method for light-emitting diodes (leds), and a display apparatus using the same. The driving circuit comprises a power switch and a dimmer circuit.
Shenzhen China Star Optoelectronics Technology Co., Ltd.
| Pulse width modulation circuit and voltage-feedback class-d amplifier circuit|
The frequency characteristic of a voltage-feedback class-d amplifier circuit for driving an output load is improved. A triangular-wave correction circuit which compensates a gradient of a triangular wave is provided to a triangular-wave signal generator which supplies a triangular wave signal used as a pwm carrier to a comparison circuit for performing pwm modulation of an input signal.
Renesas Electronics Corporation
| Method and circuit arrangement for limiting peak currents and the slope of the current edges|
A method for limiting peak currents, particularly depending on a charge quantity provided by a voltage source, and the maximum pitch of the current flanks of an electric motor for an electrohydraulic motor vehicle brake system, particularly a pump motor, controlled by pulse width modulation, wherein a change to an actual duty cycle of the pwm is made by a first duty cycle of the pwm on a second duty cycle at runtime, wherein the change takes place according to a positive or negative pitch value calculated and/or changeable at runtime. The invention further describes an electronic circuit arrangement for the implementation of a method for limiting peak currents and the maximum pitch of current flanks..
Continental Teves Ag & Co. Ohg
| Torque optimization for surgical instruments|
A control system having speed management control. The control system can be in signal communication with a battery, and the battery can be coupled to a motor.
Ethicon Endo-surgery, Inc.
| Pulse width modulation for control of late lean liquid injection velocity|
Systems and methods for pulse-width modulation of late lean liquid injection velocity can be provided by certain embodiments of the disclosure. In one embodiment, a gas turbine combustor utilizing a late lean injection scheme can be provided, wherein the combustor can include a combustor liner and a transition piece.
General Electric Company
|Single switch infinite-level power inverters|
An electrical power converter includes a circuit with a single switching transistor that is electrically connected to a direct current power source, a first inductor-capacitor (lc) circuit electrically connected to the single switching transistor, a second lc circuit electrically connected to the first lc circuit and configured to provide an output signal to a load. A controller is operatively connected to the single switching transistor.
Indiana University Research & Technology Corporation
|Power conversion apparatus and control method thereof|
An ac/dc conversion circuit of a power conversion apparatus receives an ac signal and has a switching element. A voltage sensing circuit generates a voltage reference signal according to an ac voltage signal.
National Cheng Kung University
|Method and device for controlling a motor vehicle windscreen wiper motor|
Method of controlling a motor vehicle windscreen wiper motor, powered and controlled by pulse width modulation (pwm) with duty ratio (t) of determined value, in which the instantaneous fundamental period of the modulated pulses is switched successively between at least two discrete period values (t1, t2), the duty ratio (t) of the pulses (pwm) being substantially established at a determined value for at least one determined duration (tc) of switching of the modulated pulses. Application to the reduction of the emc noise level in the radio frequency bands to be protected..
Valeo Systèmes D'essuyage
Motor control system and method
A motor control system is disclosed. The motor control system includes a level-shifting unit, a motor unit and a control unit.
Delta Electronics, Inc.
Apparatus of controlling vehicle provided with motor and control method thereof
An apparatus for controlling a vehicle provided with a motor includes a current command generator that determines first and second axes currents according to driving conditions, and a current controller that generates first and second axes voltages by using the first and second axes currents and feedback currents. An axis converter converts the first and second axes voltages into 3-phase voltages, 3-phase feedback currents into first and second axes feedback currents, and transmits the same to the current controller.
Hyundai Motor Company
Converter controller with half bridge adaptive dead time circuit and method
The present disclosure relates to a controller, a circuit and method for controlling a power converter using pulse width modulation (pwm). At least one logic block (13, 15, 16) of the controller is configured to remove a command (4) which is configured to control the other power semiconductor switch (2) in a half-bridge (1,2) so that the other power semiconductor switch (2) remains in a non-conductive state while an antiparallel diode (6) allows an electric current (5) to pass in one direction, called the diode's forward direction, while blocking current in the opposite direction.
American Power Conversion Corporation
Low power switching mode regulator having automatic pfm and pwm operation
A circuit and method for operating a switching mode power supply. A clock is driven by a current source to generate pulses at a fixed frequency using pulse width modulation for normal load demands.
Texas Instruments Incorporated
Control circuit and dc-dc converter
To provide a control circuit in a dc-dc converter, which includes transistors with the same conductivity type. The control circuit generates a pulse signal (gs), and includes a hysteresis comparator, a logic unit, a digital-analog converter circuit, and a comparator.
Semiconductor Energy Laboratory Co., Ltd.
Performance and isolation improvements for digitally controlled ac attenuation and protection circuits
A protection and attenuation circuit for sensitive ac loads is described. The circuit provides ac power protection and attenuation utilizing high-efficiency switch-mode techniques to attenuate an ac power signal by incorporating a bidirectional, transistorized switch driven from a pulse width modulation signal, pwm.
Butler Engineering Llc
Power supply circuit for central processing unit
A power supply circuit applied to a central processing unit (cpu) of a computer includes a pulse width modulation (pwm) controller, a control circuit, a first switch circuit, a second switch circuit, a first compensation circuit, a second compensation circuit, a first power circuit, and a second power circuit. When the computer is turned on, the pwm controller regulates duty cycles of pulse signals and outputs the regulated pulse signals to the first and second power circuits according to a first compensation signal, to provide a stable voltage to the cpu.
Hon Hai Precision Industry Co., Ltd.
Power supply circuit for central processing unit
A power supply circuit for supplying power to a central processing unit (cpu) of a computer includes a pulse width modulation (pwm) controller, a control circuit, a switch circuit, a first current protection circuit, a second current protection circuit, a first power circuit, and a second power circuit. When the computer is turned on, a first current protection threshold is set by the pwm controller through the first current protection circuit.
Hon Hai Precision Industry Co., Ltd.
Systems and methods for generating electrosurgical energy using a multistage power converter
The electrosurgical systems and methods according to the present disclosure use a multi-stage power converter for generating electrosurgical energy. The electrosurgical systems include an electrosurgical generator having a power converter coupled to an electrical energy source and configured to generate electrosurgical energy.
Control of an inductive load by pulse width modulation
Method and device for controlling an inductive load by pulse width modulation, on the basis of a periodic set point control signal having a given set point duty cycle. The set point control signal is, in each period of the set point control signal, in a first logic state determined from the high and low logic states for at least a first duration, and is in the other logic state during the rest of the period.
Continental Automotive France
Current-mode buck converter and electronic system using the same
A current-mode buck converter is disclosed, wherein the current-mode buck converter operates in a pulse width modulation (pwm) mode or a pulse frequency modulation (pfm) mode. When the current-mode buck converter enters into the pfm mode, the voltage level of the parking voltage is maintained at the voltage level of compensation voltage, so as to decrease switch loss of the current-mode buck converter operating between pwm mode and pfm mode, and stabilize the output voltage of the current-mode buck converter..
Anpec Electronics Corporation
A conveyance cart includes: a body frame; a deck provided liftably against the body frame to load a burden; an electric actuator electrically driven to expand or contract to lift or lower the deck; a current detection element that detects an electric current value supplied to the electric actuator; and a pwm control element that drives the electric actuator in a pulse width modulation (pwm) control manner. The pwm control element increases an on-duty ratio input to the electric actuator if the electric current value detected by the current detection element exceeds a setting value when the deck is lifted..
Kayaba Industry Co., Ltd.
Method and measuring chemical ion concentration using a feedback- controlled titrator
There is provided a method and device for measuring an ion concentration of a sample. The method comprises exposing a chemical sensor to the sample to provide an electrical output signal 5 representing said ion concentration and controlling a titrator exposed to the sample to release or absorb a quantity of ions to the sample.
Dna Electronics Ltd.
Switching power supply device and pulse width modulation circuit used therein
A problem of the present invention is to provide a switching power supply device and a pulse width modulation circuit capable of operating stably in synchronization with a clock signal. To solve the problem, a pulse width modulation circuit 3a in a switching power supply device 1a includes square-wave voltage output means 8a for, when an integrated voltage vn rises to an upper threshold voltage or more, shifting a square-wave voltage vpwm to l level, or when the voltage vn drops to a lower threshold voltage or less, shifting the voltage vpwm to h level, and clock means 6a for outputting a first clock signal vcl1 and a second clock signal vcl2, which are 180° out of phase from each other.
Power supply circuit for central processing unit
A power supply circuit for a central processing unit (cpu) includes a comparing circuit, first to third switch circuits, first and second compensation circuits, a pulse width modulation (pwm) controller, a first power circuit connected to a first output pin of the pwm controller, and a second power circuit connected to a second output pin of the pwm controller. When a motherboard operates normally, the comparing circuit outputs a first control signal to control the first and third switch circuits to be turned on.
Hong Fu Jin Precision Industry (shenzhen) Co., Ltd.
Method for controlling a multiphase converter
A method for controlling a polyphase inverter that includes a number of half bridges connected into an intermediate voltage circuit and center taps between switching elements. By cyclically switching the switching elements, the respective center taps of the half bridges are connected to an upper intermediate circuit rail or to a lower intermediate circuit rail of the intermediate voltage circuit according to the principle of pulse width modulation.
Diehl Ako Stiftung & Co. Kg
Photovoltaic inverter with swinging line filter inductors
The invention is a high efficiency single-phase or poly-phase dc-to-ac power converter apparatus and power conversion method which includes a line filter inductor or line filter inductors to integrate or filter pulse modulated waveforms into substantially sinusoidal waveforms wherein (i) the line filter inductor or inductors have inductance values that swing substantially from zero current to peak rated current and (ii) a pulse width modulation technique is used that varies both pulse width modulation duty cycles and periods as a function of the predicted instantaneous line filter inductance and the predicted di/dt across the line filter inductor or inductors in order to minimize power converter switching losses while maintaining ac power quality. With the invention, substantial cec power conversion efficiency enhancements should be achievable and with an overall reduction in power converter parts cost..
Renewable Power Conversion, Inc.
Over-current protection circuit
A circuit protecting the components of a power circuit against passing an over-current is connected to an enable terminal of a pulse width modulation (pwm) controller of a power supply circuit on a motherboard, protecting the field effect transistors (fets) of a first power circuit of the power supply circuit. The protecting circuit includes a first protection circuit.
Hon Hai Precision Industry Co., Ltd.
Signal conversion system and method
A signal conversion system and method for converting an input signal to a pulse width modulated signal is disclosed. The signal conversion system includes a sample rate converter coupled with an associated pulse width modulation (pwm) module.
Control for switching between pwm and pfm operation in a buck converter
Mode control circuitry is disclosed for use in a buck switching voltage regulator capable of operating in a pulse width modulation (pwm) mode and a pulse frequency modulation (pfm) mode, with the regulator including an inductor having first and second opposite inductor terminals, a first transistor switch connected between the first inductor terminal and a power input terminal and a second transistor switch connected between the first inductor terminal and a circuit common. Current sensing circuitry is provided to sense inductor current through the second switching transistor when the second switching transistor is switched to an on state and to produce a current sense signal which is integrated over time starting when the second switching transistor is switched to an on state and to produce a sense signal.
Texas Instruments Incorporated
Signal transmission method and related device
A method of operating an electrical power supply device having a primary side and a secondary side is provided. The method includes transmitting with an optocoupler arranged between the primary side and the secondary side a wide band control signal and a numerical information signal.
A display device includes a backlight module, a backlight control module and a flicker removing module. The backlight module electrically connected between an input pin and an output pin which belong to the backlight control module, provides a backlight source to a display panel.
Micro-star Int'l Co., Ltd.
Apparatus and recovering burst-mode pulse width modulation (pwm) and non-return-to-zero (nrz) data
A gated voltage controlled oscillator has four identically structured delay cells, each of the delay cells having the same output load by connecting to the same number of inputs of other ones of the delay cells. Optionally a four phase sampling clock selects from the delay cell output and samples, at a four phase sampler, an input signal.
Power supply conversion apparatus
Embodiments of the present invention disclose a power supply conversion apparatus, where a control unit generates a corresponding control signal according to a received high level pulse width modulation signal, to control a first pmos transistor q3, a second pmos transistor q4, and a second nmos transistor q2 to be turned off successively, and then to make a first nmos transistor q1 conducted, which makes a voltage at a second end of a bootstrap capacitor to rise from ground potential to a pvdd, so that a voltage at a first end of the bootstrap capacitor rises to a pvdd+avdd as the voltage at the second end rises, and a gate turn-on voltage of the first nmos transistor q1 reaches the pvdd+avdd.. .
Huawei Technologies Co., Ltd.
Power supply device sensing ac-off state
There is provided a power supply device sensing an ac-off state. The power supply device includes a rectifier configured to rectify ac power into dc power, a transformer configured to supply output voltage by converting voltage of the dc power rectified by the rectifier, and a pulse width modulation (pwm) control module configured to output voltage by switching a power switching device connected to the transformer, configured to drive the power supply device by connecting power of an hv pin to a vcc pin, and configured to determine an ac-off state by sensing voltage rectified by the rectifier..
Magnachip Semiconductor, Ltd.
Voltage regulator device and control method thereof
A voltage regulator device includes at least one output unit, a current sensing unit, a control unit, at least one transistor driving unit and a pulse width modulation unit. The output unit outputs an output signal.
Asustek Computer Inc.
Induction charging device
An induction charging device has: at least one charging electronics unit which includes at least one frequency unit situated between at least two dc voltage paths; at least one charging coil connected to a voltage tap of the at least one frequency unit; and at least one control unit provided to operate the at least one frequency unit at one frequency in at least one first operating state. The at least one control unit controls a power output via a pulse width modulation of a pulse duration of the first operating state relative to an operating period..
Robert Bosch Gmbh
Position signal compensation unit of motor, and motor including the same
Provided is a motor including a motor driving unit outputting a plurality of switching signals and any one of estimated three-phase voltages, in response to a control signal and a compensated position signal; a pulse width modulation (pwm) inverter outputting three-phase voltages and any one of estimated three-phase currents corresponding to the one estimated phase voltage, in response to the plurality switching signals; a motor unit operating based on the three-phase voltages and outputting a position signal according to the operation; and a position signal compensation unit receiving the position signal, the estimated phase voltage and the estimated phase current, detecting a phase difference between the estimated phase voltage and the estimated phase current and compensating for the position signal in response to the detected phase difference.. .
Electronics And Telecommunications Research Institute
High voltage controller with improved monitoring and diagnostics
A high voltage controller configured to drive a high voltage generator. The high voltage controller includes a voltage select input and a current select input, an actual voltage input and an actual current input.
Durr Systems Gmbh
System and methods to wirelessly control distributed renewable energy on the grid or microgrid
Systems and methods dynamically measure, ascertain, and compare a local facility load with local renewable energy generation in substantially real time and determine whether excess energy exists from the local distributed renewable energy resource. Further, systems and methods forecast the available excess energy from the local distributed renewable energy resources for acquisition to third parties and control a pulse width modulation (pwm) controller to deliver increments of the available excess renewable energy..
Dead-time optimization of resonant inverters
The present disclosure is directed to an electrosurgical generator including a resonant inverter having an h-bridge and a tank. A sensor array measures at least one property of the tank.
Field sequential color encoding for displays
The optical performance is enhanced of display systems that use field sequential color and pulse width modulation to generate color and color gray scale values. Such enhancement may be achieved by various data encoding methods disclosed herein that may include temporal redistribution of bit values to mitigate color motional artifacts associated with field sequential color-based display systems, selective combination of intensity modulation, pulse width modulation, and/or the noncontiguous sequencing of primary colors.
Rambus Delaware Llc
Method of valley inductance current polarity detection in a pulse width modulated circuit with an inductive charge
A valley inductance current polarity change in a pulse width modulated circuit charged with an inductive charge is detected by comparing respective times that a first output of the circuit charged with an inductive charge and a second output of a pulse width modulated reference circuit with no inductive charge reach an output level. Responsive thereto, control over operation of the pulse width modulated circuit charged with an inductive charge is made with respect to switching to a pulse skipping mode of operation or keeping the pulse width modulation mode of operation..
Stmicroelectronics International N.v.
Motor control environmentally-friendly vehicle
A motor control system and method are provided for a vehicle that reduces torque ripples due to motor system characteristics while the vehicle is running at ultra-low speed in an electric vehicle running mode. The system includes a current command generator that generates a current command based on a torque command, a motor speed, and a reference voltage.
Hyundai Motor Company
System and methods to aggregate instant and forecasted excess renewable energy
Systems and methods dynamically measure, ascertain, and compare a local facility load with local renewable energy generation in substantially real time and determine whether excess energy exists from the local distributed renewable energy resource. Further, systems and methods forecast the available excess energy from the local distributed renewable energy resources for acquisition to third parties.
Method of deriving switch current signals in a rectifier
A method of deriving synchronous switch currents for a three-phase vienna-type active rectifier that includes the step of generating gate driver signals for each phase of the rectifier by pulse width modulation, wherein the gate driver signals include a top gate driver signal, a clamp gate driver signal and a bottom gate driver signal, and the step of deriving synchronous switch current signals from the gate driver signal, wherein the synchronous switch current signals include a top gate switch current signal, a clamp gate switch current signal and a bottom gate switch current signal.. .
Hamilton Sundstrand Corporation
System and controlling dc - dc converter
A system and a method for controlling a dc-dc converter include a microcomputer for deriving an input limiting current value by dividing an input limiting power value by an input voltage value. A conversion circuit scales the input limiting current value to a limiting voltage value.
Hyundai Motor Company
Actuator driving device, control same, and imaging apparatus
An actuator driving device drives an actuator connected to an output terminal. The control unit of the actuator driving device includes a pwm delay time setting unit, a first duty ratio setting unit, and a second duty ratio setting unit.
Canon Kabushiki Kaisha
Backlight driving module and liquid crystal display using the same
A liquid crystal display (lcd) includes a backlight driving module. The backlight driving module includes a boost circuit, a control chip, and a ferrite bead.
Hong Fu Jin Precision Industry (shenzhen) Co., Ltd.
Igbt/fet-based energy savings device for reducing a predetermined amount of voltage using pulse width modulation
An igbt/fet-based energy savings device, system and method wherein a predetermined amount of voltage below a nominal line voltage and/or below a nominal appliance voltage is saved, thereby conserving energy. Phase input connections are provided for inputting analog signals into the device and system.
The Powerwise Group, Inc.
Sensor network using pulse width modulated signals
A device includes a bus interface to couple to a shared bus of a sensor network. The device also includes a sensor interface to couple to a sensor of the sensor network.
Display device and driving method thereof
A display device including a display panel which displays a video signal is disclosed. The display device includes a panel driver configured to drives the display panel; a light source configured to provide light to the display panel; a light source driver configured to control the brightness of the light source in accordance with a pulse width modulation dimming signal in synchronization with a vertical sync signal; and a controller configured to receive the vertical sync signal, determine whether the frequency of the vertical sync signal is normal or abnormal, and provide the dimming signal (pwm pulses) to the light source driver in non-synchronization with the vertical sync signal during at least one frame, in response to the frequency of the vertical sync signal being abnormal..
System and pulse width modulation
A circuit for use with pwm signal having first pulse and a second pulse, wherein the first pulse has a period and a first duty cycle, and the second pulse has the period and a second duty cycle. The period has clock information therein, the first duty cycle has first data information therein, and the second duty cycle has second data information therein.
Dc to dc converters, pwm controllers, and inductor current emulation circuits therefor
Dc to dc converters and pulse width modulation controllers are presented with compensation circuitry to mitigate discontinuous conduction mode (dcm) undershoot and continuous conduction mode offsets in inductor current emulation information by providing compensation signals proportional to the output voltage and the converter off time (toff) when the low side converter switch is actuated.. .
On-board battery charger for electric vehicles and control method thereof
An on-board battery charger is provided that senses a voltage value of power input from a charging facility when the charging facility is connected to charge the batteries and receives a pulse width modulation (pwm) signal of a current value of the power from the charging facility. In addition, the charger calculates an output voltage value to be output to the batteries using the sensed voltage value of the input power and an output current value to be output to the batteries using a duty value of the received pwm signal.
Charger and charging system
A charger and a charging system are provided. The charger includes: a rectifier, a transformer, a first diode, a capacitor, a voltage sampling feedback unit, a pulse width modulation (pwm) controller, a battery voltage feedback unit and a semiconductor switching component, where the battery voltage feedback unit is added in the charger to detect battery voltage of a terminal, and the detected battery voltage of the terminal is fed back to a voltage sampling feedback unit inside the charger, so that the voltage sampling feedback unit can adjust an output voltage of the charger in real time according to an actual battery voltage of the terminal, and therefore, the output voltage of the charger gradually rises along with an increase of the battery voltage of the terminal, thereby effectively reducing energy consumption of the charger and achieving a purpose of energy saving..
Pulse width modulation control of solenoid motor
A drive mechanism configured to drive a thermally isolated actuator between two positions. The drive mechanism includes a rotary actuated motor configured to rotatably drive a motor member, and a drive member coupled to the motor member and having a drive arm configured to responsively move from a first position to a second position upon rotation of the motor member.
Gain compensation for a full bridge inverter
An electrosurgical generator and related systems and methods using a gain-compensated full bridge topology. Gain nonlinearity is corrected by applying impedance and phase correction factors to a control loop to achieve a linear gain structure.
Wireless power transmitter and wireless power transfer method thereof
A wireless power transmitter including a power supply unit configured to supply an input voltage; a power conversion unit configured to generate wireless power based on a driving signal, generated by the supplied input voltage and a first pulse width modulation (pwm) signal, and transfer the wireless power to a wireless power receiver; and a power transmission control unit configured to receive a voltage value of a battery charged with the wireless power through a wireless network, and generate the first pwm signal based on the voltage value of the battery.. .
Predictive pulse width modulation for an open delta h-bridge driven high efficiency ironless permanent magnet machine
Embodiments of the present method and system permit an effective method for determining the optimum selection of pulse width modulation polarity and type including determining machine parameters, inputting the machine parameters into a predicted duty cycle module, determining the optimum polarity of the pulse width modulation for a predicted duty cycle based on a pulse width modulation generation algorithm, and determining the optimum type of the pulse width modulation for a predicted duty cycle based on the pulse width modulation generation algorithm.. .
Compositions, devices, and methods for nicotine aerosol delivery
The present disclosure generally relates to compositions, and related devices and methods, useful in vaporizing devices such as electronic cigarettes. The composition may comprise nicotine, at least one solvent, and at least one ion pairing agent, and may be vaporized to form a condensation aerosol, wherein inhalation of the aerosol allows for deposition of nicotine with the respiratory system, including deep lung deposition.
Sensing physiology measurements
A sensing system for physiology measurements comprises a transmission end including a measuring signal generating module having at least one overshoot and undershoot wave generating circuits and a transmitting antenna module having at least one transmitting antenna; a receiving end having a plurality of receiving antennae with each receiving antenna receiving a reflected signal reflected by a target object; and a plurality of signal analyzing modules to generate a plurality of object active state signals by analyzing the reflected signal from each receiving antenna and transmit the plurality of object active state signals to a digital signal processor. Wherein each overshoot and undershoot wave generating circuit generates a measuring signal with overshoot and undershoot waves according to an inputted pulse width modulation signal, and each transmitting antenna emits the measuring signal to the target object..
Power converter and operating method thereof
A power converter is disclosed. The power converter includes a comparator and a timing generator.
Current source inverter and operation method thereof
A current source inverter includes a controller, an input unit, a buffer unit, a modulating unit, and a commutator. The controller generates a switch control signal, an inverse switch control signal, a first pulse width modulation control signal, and a second pulse width modulation control signal.
Backlight driving board and lcd device
The present invention discloses a backlight driving board for driving a backlight source, comprising a microprocessor and a constant current driver chip. The microprocessor receives a display mode switching signal and a synchronization signal from a liquid crystal driving board, and generating a first pulse width modulation signal corresponding to the backlight source according to the display mode switching signal and the synchronization signal.
Conditionally variable strobe notification appliance
A strobe notification device that operates based on a sensed environmental condition is disclosed. The strobe notification device includes a programmed candela setting, programmed locally at the strobe notification device or programmed remotely and sent to the strobe notification device.
Thermal balance conversion circuit
A thermal balance conversion circuit includes a voltage conversion circuit, a temperature detection circuit, a pwm controller, and a signal integration controller. The voltage conversion circuit includes a plurality of voltage conversion units, and each of the voltage conversion units converts the dc voltage of a external power to a driving voltage.
Systems and methods for adaptive motor speed control
A system including memory to store a plurality of sets of values, where each set is used to control speed of a different type of motor. A pulse width modulation (pwm) module receives an input indicating a type of motor sensed in the system, selects a set corresponding to the type of the sensed motor, and generates, based on the selected set, a pulse width modulation signal to control speed of the sensed motor.
Control circuit for power converter and method thereof
A control circuit for a power converter includes a pulse width modulation signal generating circuit, a power estimation circuit, and a current limiting signal generating circuit. The pulse width modulation signal generating circuit generates pulse width modulation signals according to a current sense signal and a current limiting signal for configuring the conduction status of a switch circuit of the power converter.
Activation activating a direct voltage converter
The invention relates to an activation apparatus (20) for a galvanically decoupled direct voltage converter having a synchronous rectifier, comprising a signal generating device (22), which is designed to generate control signals (22c, 22d) for switch devices of the synchronous rectifier and a reference current signal (22b), a first comparator device (23), which is coupled to the signal generating device (22), and which is designed to detect the secondary-side output current (jo) of the synchronous rectifier, compare it to the reference current signal (22b) and generate a current control signal in dependence on the comparison, and a pulse width modulation device (25), which is coupled to the signal generating device (22) and the first comparator device (23) and which is designed to generate pulse width modulated activation signals (25a) for the switch devices of the synchronous rectifier on the basis of the control signals (22c, 22d) and the current control signal, wherein the signal generating device (22) is furthermore designed to reduce the reference current signal (22b) within a first predetermined timespan to a predetermined reference current threshold.. .
Power converter having reduced switching transients
A power converter having reduced switching transients includes a conversion inductance, a pulse width modulation (pwm) controller, a conversion inductance, and a switch transistor. A low pass filter is connected between the pwm controller and the switch transistor to filter a pwm signal produced by the pwm controller and produce a filtered pwm signal.
Electronic device with led
An electronic device comprises a control unit, a power supply, a switch unit, a driving unit, and an illumination unit. The control unit generates a pulse width modulation (pwm) signal with a first level signal and a second level signal.