107 results about "Pwm controller" patented technology

The invention relates to the technical field of power supplies, and discloses a synchronous rectification control circuit and a synchronous rectification power supply device, and the circuit comprises a power conversion module, an output current sampling module, and a PWM controller. The power conversion module comprises a follow current switch tube which is connected in parallel with two ends of a load. The output current sampling module is connected in series in a secondary winding loop and is used for collecting output current flowing through the secondary winding loop and generating an output current signal; the PWM controller is connected with the output current sampling module and is used for driving the follow current switch tube, the PWM controller is configured to compare the output current signal with a preset threshold value, and when the output current signal is greater than or equal to the preset threshold value, a first group of PWM control signals is generated to drive the follow current switch tube; and when the output current signal is smaller than the preset threshold value, stopping driving the follow current switch tube. According to the invention, no-load loss can be reduced, and the requirements of electronic products for high power density and low loss can be met.

The application relates to the technical field of power supply, and discloses a synchronous rectification control circuit and a synchronous rectification power supply device, which comprise a power conversion module, an output current sampling module and a PWM controller; the power conversion module comprises a freewheeling switch tube and is connected in parallel at two ends of a load; the output current sampling module is connected in series in a secondary winding loop, is used for collecting an output current flowing through the secondary winding loop, and generates an output current signal; the PWM controller is connected with the output current sampling module and is used for driving the freewheeling switch tube; the PWM controller is configured to compare the output current signal with a preset threshold value, generate a first group of PWM control signals when the output current signal is greater than or equal to the preset threshold value, and drive the freewheeling switch tube; and stop driving the freewheeling switch tube when the output current signal is less than the preset threshold value. The application can reduce no-load loss and adapt to the demand of electronic products for high power density and low loss.

An input signal may be converted to a first PWM signal and a second PWM signal at a PWM controller circuit. The first PWM signal and the second signal output may drive a driver circuit. The driver circuit may receive a high voltage power supply from a boost converter or other power supply circuit. The driver circuit may include a high side device and a low side device. The output of the driver circuit may drive a filter circuit that includes a filter capacitor, an inductor, and a haptic actuator. The haptic actuator may generate a desired haptic response at the haptic actuator.

The application discloses a bidirectional direct current conversion device and a control method thereof. The bidirectional direct current conversion device comprises a cascaded LLC resonant converter and a half-bridge Buck-Boost converter. The control method comprises the following steps: an LLC current loop obtains an error feedback item through a first controller based on the error between a battery current instruction and a battery current sampling value; the LLC current loop obtains a feedforward quantity by multiplying the battery current instruction by a proportional coefficient; the LLC current loop superimposes the feedforward quantity and the error feedback item to obtain a half-bridge current instruction; a half-bridge current loop generates a duty cycle signal of the half-bridge Buck-Boost converter through a second controller based on the error between the half-bridge current instruction and a half-bridge current sampling value; and a PWM controller drives a switch tube of the half-bridge Buck-Boost converter according to the duty cycle signal. The method can realize fast and high-precision control of the battery current.

The invention discloses an adjustable high-voltage output low-ripple switching power supply which comprises an input filter circuit, a VCC power supply circuit, a PWM controller, a main power circuit, a high-frequency transformer, a linear voltage regulation circuit, an output rectification filter, an output voltage regulation circuit and an output auxiliary source reference circuit. The method for realizing low-ripple high-voltage adjustable output and controlling the voltage and current slew rate of an external N-channel MOSFET switch comprises the steps of independently setting the voltage slew rate and the current slew rate, setting the voltage slew rate through an external capacitor and setting the current slew rate through an external resistor. The high-voltage adjustable output is realized, the output ripple is reduced, the voltage regulation rate is improved, the EMI (Electro-Magnetic Interference) performance is optimized, the high-frequency harmonic power is reduced, the efficiency loss is reduced, and the problem that the traditional switching power supply cannot realize high-voltage, adjustable and low-ripple output at the same time is solved.

A class D amplifier including a pulse width modulation (PWM) control loop, an H-bridge driver, a PWM controller having a PWM pulse generator to generate PWM pulses supplied to the H-bridge driver in response to an ADC value output by an analog-to-digital converter of the PWM control loop, and a comparator. The comparator is configured to trigger a cutoff of a PWM pulse generated by the PWM pulse generator during a respective loop cycle of the PWM control loop and to trigger generation of at least one counter PWM pulse with an opposite polarity in the respective loop cycle such that a net pulse energy of the cutoff PWM pulse and of the at least one generated counter PWM pulse corresponds to a pulse energy representing the ADC value provided by the analog-to-digital converter of the PWM control loop during the respective loop cycle.

This invention relates to a safety protection method and circuit for preventing electron backflow in an ion electric thruster, applicable to spacecraft ion electric propulsion systems. The ion electric thruster's grid gate is connected to the positive output terminal of the grid power module, the acceleration grid gate is connected to the negative output terminal of the acceleration power module, and the common ground is connected to the common power ground of both the grid power module and the acceleration power module. The safety protection method involves detecting the output current of the acceleration power module to determine if an overcurrent has occurred. If an overcurrent has occurred, a synchronous shutdown signal is generated and transmitted to the PWM controllers of 1 to N grid power modules and acceleration power modules. Upon receiving the synchronous shutdown signal, the PWM controllers of the 1 to N grid power modules and acceleration power modules synchronously shut down their voltage output terminals, thereby achieving synchronous 0V voltage signal output from the positive high-voltage output terminals of the 1 to N grid power modules and the negative high-voltage output terminal of the acceleration power module, preventing electron backflow caused by any grid module failing to shut down its high-voltage output.

The embodiment of the invention relates to the technical field of direct-current power transmission, and discloses a flexible chopping type direct-current energy consumption device and an online energy taking power supply, method and system thereof, and the online energy taking power supply comprises an input end, a starting circuit, a PWM controller, a switching tube Q, a transformer T and a photoelectric coupler OC; the first end of the input end is connected to a direct current capacitor C of the power module; the second end of the input end is connected to the input end of the starting circuit; the output end of the starting circuit is connected to the first input end of the PWM controller; the output end of the PWM controller is connected to the first pole of the switching tube Q; the second pole of the switching tube Q is connected to the primary side of the transformer T; the secondary side of the transformer T is connected to the input end of the photoelectric coupler OC; and the output end of the photoelectric coupler OC is connected to the second input end of the PWM controller. According to the embodiment of the invention, the energy required by the control circuit can be conveniently obtained, and an industrial frequency transformer is not needed.

The utility model relates to the technical field of heating plates, and discloses a high-efficiency electricity-saving heating plate which comprises an operation controller, a control key is fixedly installed at the top end of the operation controller, a digital display screen is fixedly installed at the top end of the operation controller, a control circuit board is fixedly installed in an inner cavity of the operation controller, and the digital display screen is fixedly installed in an outer cavity of the operation controller. The top end of the control circuit board is fixedly connected with a PWM controller chip, a timer IC chip, a temperature monitoring chip and an analog temperature control chip, and the top end of the control circuit board is fixedly connected with a power supply chip, a power supply chip and a power supply chip. The intelligent chip is arranged to control the heating plate, the intelligent chip can intelligently adjust the current by monitoring parameters such as current and temperature of the heating plate in real time, energy is saved to the maximum extent while the heating effect is ensured, and when the heating plate reaches the set temperature, the intelligent chip can automatically adjust the current, so that the heating effect is improved. And unnecessary energy waste is avoided.

The invention discloses an output voltage synchronous acquisition circuit, which comprises a sampling circuit, an MCU (Microprogrammed Control Unit) and a PWM (Pulse Width Modulation) controller, the sampling circuit is connected with the output end of the welding power source and used for outputting a sampling voltage signal matched with the input range of the MCU. The control input end of the PWM controller is connected with the MCU, the PWM controller is used for generating a PWM signal according to an instruction of the MCU so as to control the output of the welding power supply, and the PWM controller is provided with a synchronous signal output end and is used for outputting a synchronous pulse signal when each PWM period starts; wherein the trigger input end of the MCU is connected with the synchronous signal output end of the PWM controller, and the MCU is configured to respond to a received synchronous pulse signal and trigger the ADC in the MCU to sample a sampling voltage signal. Compared with the prior art, the method has the advantages that the synchronous signal of the PWM controller serves as an ADC sampling hardware trigger source of the MCU, the sampling starting point and the power output period starting point are strictly aligned, the problem of time sequence randomness caused by traditional software triggering is solved, and the sampling precision is improved to the microsecond level.

The half-bridge LLC circuit comprises an LC filter circuit, an MOS tube bridge arm, a capacitor bridge arm, a resonant inductor Lr, a transformer, a diode D1, a diode D2, a diode D3, a diode D4, a filter capacitor Co, a resistor RL, a compensator, an amplitude limiter, a voltage-controlled oscillator, a PWM controller, an isolation driver, a comparator and a PI controller. According to the invention, the problems of loss, electromagnetic interference and the like caused by improvement of the switching frequency of the existing hard switching circuits such as forward and half-bridge circuits in the space navigation secondary power supply system are solved.

The utility model discloses an intelligent control system for a shipborne water pump. The intelligent control system comprises a temperature sensor, a microprocessor, a PWM (Pulse Width Modulation) controller, an IoT chip and a remote monitoring platform, the output end of the temperature sensor is connected to the microprocessor; the microprocessor controls the working rotating speed of a water pump of the cooling system according to the temperature data, and the output end of the microprocessor is connected to the PWM controller; the PWM controller outputs a corresponding PWM signal to a water pump of the cooling system based on a control signal of the microprocessor so as to control the rotating speed of the water pump; and the microprocessor is connected with the IoT chip, is connected with a remote monitoring platform through the IoT chip, and is used for uploading the monitored working state data of the shipborne water pump to the remote monitoring platform. The water pump control system has the advantages that the water pump is adjusted and controlled in a PWM mode according to monitoring data of the water pump, so that the rotating speed of the water pump is accurately controlled, the purpose of controlling the rotating speed according to needs is achieved, noise is reduced, and energy consumption caused by mismatching of the rotating speed and the needs is reduced.

The control system comprises a valve, an actuator, a PWM controller and a power source, the actuator is installed on the valve, a valve element of the actuator is connected with an output shaft of the actuator, the PWM controller is connected with the actuator, and the power source is connected with the power source end of the PWM controller. The invention relates to the technical field of valves, in particular to a control system of a PWM regulating valve.

The invention discloses a synchronous rectification driving circuit and a flyback converter, and realizes synchronous rectification control with efficient conversion and current backflow prevention. The circuit comprises a primary driving circuit, an isolating circuit, a secondary driving circuit and a duty ratio limiting circuit, the primary driving circuit is connected with the output end of the PWM controller and the control end of the primary switching tube; the isolating circuit is connected with the output end of the PWM controller, the first input end of the duty ratio limiting circuit and the first input end of the secondary driving circuit; the output end of the secondary driving circuit is connected with the second input end of the duty ratio limiting circuit and the control end of the secondary synchronous rectification switch tube, and the output end of the duty ratio limiting circuit is connected with the second input end of the secondary driving circuit; the duty ratio limiting circuit samples the secondary driving signal through an internal voltage sampling circuit, resets the voltage sampling circuit cycle by cycle according to a first input end signal of the duty ratio limiting circuit, and turns off the secondary driving circuit when the duty ratio of the secondary driving signal exceeds a preset threshold value.

The utility model relates to the technical field of solar storage battery temperature control, in particular to a solar storage battery sensing temperature control self-heating system which comprises a protection box, a heating load module is arranged in the protection box, a storage battery is placed in the heating load module, and the storage battery is arranged in the protection box. A pulse generation and control module electrically connected with the heating load module is arranged at one end of the outer side wall of the protection box, and a temperature collection and feedback module is arranged in the middle of the side wall of the heating load module. The pulse generation and control module is combined with the PWM controller, so that the dynamic adjustment of the pulse frequency and the duty ratio is realized, the heating power can be accurately controlled according to the real-time temperature feedback, the energy consumption is obviously reduced, and the system adaptability is improved; a grid frame structure consisting of transverse and longitudinal PTC heating sheets is adopted, and a silica gel heat diffusion layer (the heat conductivity coefficient is greater than or equal to 3W / m.K) is combined, so that rapid and uniform transfer of heat is ensured.

An aerosol delivery device includes a substrate (610) configured to carry an aerosol precursor composition, and a resonant transformer (1202) including a transmitter coupling device (302) and a resonant receiver coupling device (602) proximate the substrate. The aerosol delivery device also includes a pulse width modulation (PWM) inverter (1204) configured to drive the resonant transformer. The PWM inverter includes a bridge circuit (1206) coupled to the transmitter coupling device, and a PWM controller (1208) embodied as an integrated circuit and configured to output a PWM signal to the bridge circuit configured to drive the transmitter coupling device to generate an oscillating magnetic field and induce an alternating voltage when the resonant receiver coupling device is exposed to the oscillating magnetic field. The alternating voltage induces the resonant receiver coupling device to generate heat and thereby vaporize components of the aerosol precursor composition.

The application discloses a wind heat environment simulation device and a control method thereof. The method is characterized in that a heating array composed of a flexible electric heating film and a one-to-one corresponding temperature sensor array are arranged on the surface of a heated object, and a wind speed sensor is arranged. A controller calculates the basic heating power of each heating unit according to a preset wind speed-power mapping relationship and a real-time wind speed value. Meanwhile, the power of each heating unit is independently closed-loop corrected according to the deviation between the actual temperature and the target temperature fed back by each point temperature sensor. After the feedforward value and the feedback correction value are superimposed, each heating unit is driven by a multi-loop PWM controller. The application realizes the instant response of the heating array to the change of the wind speed and the accurate control of the non-uniform temperature field on the surface, has the advantages of small thermal inertia, high control precision, low system complexity and easy expansion, and provides a reliable experimental platform for the research on the urban wind heat environment.

The utility model relates to a kind of igniters, comprising: the connector for taking electricity from USB device, with the connector voltage-boosting oscillation circuit, with the output end of the voltage-boosting oscillation circuit is connected for producing electric arc electrode;Wherein, the voltage-boosting oscillation circuit includes high-frequency transformer, MOS switch and PWM controller;The high-frequency transformer includes primary winding and secondary winding, the primary winding is powered by the connector;The MOS switch is connected with the primary winding in series;The PWM controller is by control the MOS switch to make the circuit of the primary winding controlled opening and closing, and make the secondary winding produce high-voltage oscillation current.The igniter of the utility model uses electric arc to ignite, warm up fast, safer to use.

A kind of DC-DC converter based on anti-radiation PWM controller chip C42603RHC, including main power circuit and control circuit, main power circuit is composed of input filter, primary side full bridge, secondary side current doubling rectification, current sampling and output filter circuit, control circuit with anti-radiation chip C42603RHC as core, equipped with two consistent primary side drive circuit, and the drive signal is isolated by transformer.The control chip used in the application is anti-radiation, supports primary and secondary side control and overvoltage, overcurrent protection and other functions;Discard the traditional drive chip, reduce volume and cost, power density reaches 6W / cm³;Conversion efficiency is as high as 91.91%, and simple structure, high reliability, good output performance.

A circuit includes an amplifier having a first input, a reference input, and an output. A pulse width modulator (PWM) controller has an input coupled to the output of the amplifier. A first switch has a control terminal coupled to an output of the PWM controller. A second switch has a second terminal coupled to the second terminal of the first switch, and has a control terminal coupled to the output of the PWM controller. An input of a current sensor is coupled to the second terminal of the first switch and is coupled to a second terminal of the second switch. An output of the current sensor is coupled to the first input of the amplifier. A duty cycle monitoring and reference signal adjustment circuit has an input coupled to the output of the PWM controller and has an output coupled to the reference input of the amplifier.

The application discloses a small-caliber ammunition full-electronic fuse, and relates to the technical field of full-electronic fuses; the small-caliber ammunition full-electronic fuse comprises an EMI module, an isolation power module, a voltage conversion module, a sensor module, a safety control module, a high-voltage conversion module, a detonation module and a detonator assembly; the isolation power module comprises a PWM controller, the PWM controller is powered by V1, an energy storage inductor, a first isolation capacitor and a second isolation capacitor; the energy storage inductor is connected with the PWM controller output end; the energy storage inductor is connected with the first isolation capacitor; the second isolation capacitor is connected with the PWM generator ground end. Compared with the isolation power module in the prior art, the application has the advantages that the capacitor isolation does not generate heat, the energy transmission efficiency is high, the power supply manufacturing efficiency is high, the power of the isolation power module reaches 3W, the volume is reduced to 1cm 3 , and the volume is reduced to 10% of the volume of the product in the prior art.

The utility model discloses a kind of double PWM controllers for isolating power supply, it is related to power management technical field, the input end of LDO1 and LDO2 of the utility model is simultaneously connected power supply VIN, LDO1 converts power supply VIN into driving power supply VCC and gives external power drive circuit power supply, and LDO2 converts power supply VIN into internal power supply VREF and gives internal analog circuit power supply, that is, the driving power supply and analog power supply are separated by LDO1 and LDO2 in the application, to adapt to the power supply of wide input voltage range;Meanwhile, the output end OUTA of first PWM controller is connected the gate of main switch tube Q1, the output end OUTB of second PWM controller is connected the gate of clamping switch tube Q2, when Q1 is turned on, input voltage is applied in transformer primary side, energy is stored in transformer, when Q1 is turned off, stored energy is released to load through secondary side, clamping switch tube Q2 in this time main switch tube Q1 during turn-off, absorb the energy stored in transformer, to limit the rate of primary voltage rise to carry out high efficiency control.

The invention discloses a generator set torque control method and system based on multi-dimensional perception, and relates to the technical field of torque control, and the method comprises the following steps: judging whether a torque monitoring result is accurate or not, based on a dp coordinate system and a switching function model of a PWM controller, judging a fault reason according to a first timestamp, and judging a fault reason according to a second timestamp; and selecting compensation regulation or calculating a first voltage based on a fault reason, converting the first voltage into a first rotor speed and a first rotor flux linkage, converting the first rotor speed and the first rotor flux linkage into disturbance parameters by combining monitoring data, fusing load characteristics, and performing first regulation on torque. According to the method, a double-path strategy of compensation regulation or calculation of the first voltage is automatically selected through fault reasons, then monitoring data are fused to generate disturbance parameters, robustness is improved, a torque calculation result is fused with load characteristics to predict an output torque sequence, regulation actions are preposed, and the control accuracy is improved. And rotation speed drop or power overshoot caused by traditional feedback lag is avoided.

This invention discloses an anti-shading solar power supply system for outdoor electronic bus stop signs and shelters. It includes multiple sets of photovoltaic power generation units, each consisting of at least two solar photovoltaic panels connected independently in parallel with positive terminals connected to each other and negative terminals connected to each other, with no series connection between the power generation units. It also includes multiple independent PWM solar controllers, each with its input terminal electrically connected to only one set of power generation units, and each PWM controller is electrically independent. This invention employs multiple independent PWM solar controllers, each corresponding to a set of power generation units with multiple independently connected photovoltaic panels. The power generation units are not connected in series and generate electricity independently. When any photovoltaic panel is shaded by a building or tree, or its surface is partially covered by leaves, dust, bird droppings, or other substances, only the power generation power of the unit containing that photovoltaic panel is affected; other power generation units continue to operate normally.

The switching converter equipped with negative current tracking control includes a switching transistor whose drain is connected to an input power supply, a rectifying transistor whose drain is connected to a source of the switching transistor and whose source is connected to a ground, an inductor having one end connected to the source of the switching transistor and the drain of the rectifying transistor, an output capacitor having a first end connected to the other end of the inductor and a second end connected to a ground, a PWM controller that outputs a PWM control signal to a gate of the switching transistor and a gate of the rectifying transistor, a zero current detector that detects zero crossing of an inductor current flowing through the inductor, and a negative current tracking controller that variably adjusts an offset of the zero current detector.

The application relates to the technical field of pump laser driving, and particularly discloses a large-current pump laser constant-current driving circuit, which comprises a single-chip microcomputer, a current detection resistor, a differential amplifier, a comparator, a PWM controller and a MOS tube; the comparator is connected with the PWM controller, the differential amplifier and the single-chip microcomputer respectively; the PWM controller, the MOS tube and the current detection resistor are sequentially connected; the current detection resistor is connected with the differential amplifier and the pump laser respectively; the single-chip microcomputer provides a set current; the current detection resistor detects the working current of the pump laser; the differential amplifier is used for amplifying the working current; the comparator is used for comparing the amplified working current with the set current and then outputting a feedback voltage to the PWM controller; and the PWM controller adjusts the on-duty ratio of the MOS tube according to the feedback voltage, so as to adjust the working current of the pump laser. The application can realize the automatic constant-current working of the pump laser, the hardware circuit can automatically keep the constant current, and the control is simple and efficient.

The present application discloses a DC converter and a control method of a PWM controller, including a PWM controller. The PWM controller alternately outputs two state signals, a first state signal is configured to control a first switch SW1 and a second switch SW2 to turn on; a second state signal is configured to control a third switch SW3 and a fourth switch SW4 to turn on. The PWM controller is configured to output a fourth state signal for controlling the first switch SW1 and the third switch SW3 to turn off when it is determined that the first terminal voltage VOP of the positive voltage output capacitor COP is greater than the first target voltage VM1, the PWM controller.

The invention provides a Pockels cell high-voltage power supply with double transformers connected in parallel, and the power supply comprises a DC input power supply which provides DC voltage power supply for the power supply; the half-bridge driving circuit is used for driving the MOS tube, so that the transformer works; the LLC resonant network realizes soft switching of the circuit under resonant frequency, and reduces electromagnetic interference and heat loss; the double transformers are used for boosting, and voltage boosting is achieved through the turns ratio of the transformers and resonance amplification; a rectifying circuit that rectifies the high-frequency AC to a DC high voltage; and the feedback circuit adopts closed-loop control, monitors the output voltage and current, and feeds back the output voltage and current to the PWM controller at the input side to adjust the duty ratio or the frequency. Through the parallel connection of the double power supplies, the output power is increased, and larger power is provided for the Pockels cell modulator so as to realize higher repetition frequency requirements.

The utility model provides a testing device of a train traction controller. The testing device can simulate various signal interfaces such as 14-path digital output, 26-path digital input, 4-path train speed signal, 6-path analog signal input, IGBT feedback signal and the like. The test device accurately simulates the working environment of the traction controller through the square wave signal output circuit, the first voltage conversion circuit, the second voltage conversion circuit and other modules, and realizes comprehensive detection of the controller. The method specifically comprises the steps that train speed signals are simulated through a PWM controller, stable voltage signals are provided through a voltage stabilizer, analog input signals are adjusted through a switch and a resistor, and it is ensured that various input and output signals of a traction controller can be accurately responded. According to the device, various functions of the traction controller are verified by simulating input signals under different working conditions, the mode of relying on field loading in the traditional testing process is avoided, and the testing time and cost are reduced.

The invention relates to the technical field of battery maintenance, and discloses a method for maintaining a lithium battery on line by utilizing energy transfer, which comprises an external power supply input port J1, a load and a diode D1, and is characterized in that the external power supply input port J1 is communicated with the diode D1, the external power supply input port J1 is communicated with a triode Q2, the input end of the triode Q2 is communicated with a PWM (Pulse Width Modulation) controller U3, and the output end of the PWM controller U3 is communicated with the load. The output end of the triode Q2 is communicated with a farad capacitor C1, the output end of the farad capacitor C1 is communicated with a current sampling resistor R8, and the output end of the sampling resistor R8 is connected with an energy interaction loop and a current-voltage conversion chip U1. The SEI film is punctured by the electric pulse, so that the voltage and current of the charged and discharged electric pulse are detected, the capacity is represented to a processor, and particularly, the voltage is sustainable in combination with the maximum electricity utilization current of the machine.