208 results about "Pwm controller" patented technology

The invention provides a high-efficiency flexible photovoltaic module installer and an installation method, a support is of a V-shaped structure, side pressure modules are installed at the two ends of the top of the support, a telescopic module is installed in the center of the support, and the telescopic module is used for adjusting the position of an extrusion driving module so as to adjust the pressure of the extrusion driving module on a cable; the extrusion driving module is installed at the tail end of a telescopic rod of the telescopic module, the electric box is fixed to the support, a battery, a circuit module and a key are arranged in the electric box, and the circuit module is electrically connected with the battery, the key, the telescopic module and a driver. The device can quickly and stably move a batch of photovoltaic panels from a starting point to a preset position, so that the installation efficiency is greatly improved, the construction period is shortened, and manpower and material resources are reduced; the MPPT / PWM controller is arranged, so that power generated by the photovoltaic panel can be directly utilized to charge the battery, and long-time continuous operation is ensured; the installation process is remotely controlled by a remote controller or intelligent equipment, personnel do not need to participate in high-altitude and carrying operation, the construction risk is effectively reduced, and the safety of operators is guaranteed.

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 invention belongs to the technical field of electronic circuits, and particularly relates to an oscillator circuit for a PWM controller. Comprising an oscillator module which comprises a feedback loop and a current detection circuit; the hiccup module is used for gating and outputting an input signal by a data selector according to the level of the input PWM logic control signal so as to control the on-off of a transmission gate, establishing a charging and discharging process and providing a delay starting function for the oscillator module; and the jittering frequency module outputs current sources Iref0 of different sizes by performing combined gating on a current source I'ref and current sources I1-I4, outputs four paths of current sources Iref1-Iref4 of different sizes through a current mirror array mirror image, and provides charging and discharging current for the oscillator module and the hiccup module. By dynamically adjusting the PWM frequency, the switching frequency is matched with the load requirement, the invalid switching frequency is reduced, and the power consumption is greatly reduced.

The invention discloses a heat dissipation control system of a server and the server, and relates to the technical field of server heat dissipation, and the heat dissipation control system comprises a main processing core, a co-processing core, a temperature sensor, a fan, a PWM controller and a target memory. When the main processing core is in a fault state, the co-processing core obtains a target duty ratio of a next period and writes the target duty ratio into the PWM controller based on a target operation mode of the current period of the server and temperature data of the current period read from the temperature sensor, and can also obtain a rotating speed of the current period based on a preset proportion and the PWM controller. According to the method, the problem that large noise and mechanical stress are generated due to the fact that a CPLD controls a fan at the maximum rotating speed under the condition that a main processing core breaks down in the prior art can be solved, on one hand, a multi-stage fault-tolerant mechanism can be achieved, and the heat dissipation reliability of a server is improved; and on the other hand, the rotating speed of the fan is intelligently and relatively smoothly adjusted, and relatively low noise and mechanical stress are generated.

The invention discloses an asymmetric six-phase hybrid excitation synchronous motor, a control algorithm and a two-gear transmission thereof, a stator winding of the motor is composed of two sets of three-phase symmetric windings in star connection, the first set of windings and the second set of windings are respectively connected to two three-phase PWM (Pulse Width Modulation) controllers, namely a main controller and an auxiliary controller, and the main controller and the auxiliary controller are respectively connected with the three-phase PWM controllers. And the two controllers are jointly powered by a vehicle-mounted battery. According to the asymmetric six-phase hybrid excitation synchronous motor, the control algorithm and the two-gear transmission thereof, under the condition that the battery voltage is limited, the output power of the motor can be further improved, in addition, the motor rotor is powered by the excitation winding, the excitation winding of the rotor is directly regulated and controlled in real time, and the efficiency of the motor is improved. And the high speed, miniaturization and high efficiency of the vehicle-mounted synchronous motor are greatly improved.

The invention discloses a partition temperature control method for a vehicle cabin, and the method is characterized in that the method comprises the following steps: S1, obtaining the temperature distribution data in the cabin; s2, fusing the temperature distribution data and preset environment temperature and humidity data to generate a dynamic partition thermodynamic diagram; s3, identifying the posture of the passenger through a convolutional neural network unit, and predicting future temperature and thermal comfort requirements based on the dynamic partition thermodynamic diagram through an LSTM model; s4, after an air conditioner controller receives the predicted thermal comfort degree demand signal, the working state of a semiconductor chilling plate of an independent execution mechanism of each air outlet is controlled and adjusted, and the air supply temperature is adjusted; the air conditioner controller transmits a PWM signal to the PWM air volume controller, the PWM controller adjusts the duty ratio of the PWM air valve after receiving the PWM signal, the micro stepping motor adjusts the opening degree of the air outlet blades of the independent air outlets according to the PWM signal transmitted by the PWM air valve to adjust the air supply volume, and temperature regulation and control required by different individuals are adapted.

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.

A control system for a burst mode of a switching power supply, and a PWM controller, which relate to the technical field of power supplies. The control system comprises: a feedback signal detection circuit (10), which is used for detecting and generating a feedback signal that is related to an output voltage of a switching power supply; a primary winding sampling circuit (20), which is coupled to a primary winding of the switching power supply and is used for sampling a sampling voltage of the primary winding; a burst mode soft control circuit (30), which is used for receiving the feedback signal and outputting an electrical signal; and a comparison circuit (40), which is used for obtaining a threshold value of the sampling voltage on the basis of the electrical signal and the sampling voltage, such that a burst mode is started when the feedback signal is higher than a soft start threshold voltage, and the burst mode is pre-exited when the feedback signal is lower than a preset threshold voltage and higher than a soft exit threshold voltage. The control system can effectively eliminate audio noise when a burst mode is entered and exited.

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 utility model discloses a power supply management chip and a power supply management circuit. The power supply management chip comprises a PWM controller, an MOS device and a gallium nitride device. The PWM controller is used for generating a high-frequency PWM signal, the output end of the PWM controller is connected with the input end of the MOS device, and the generated PWM signal is sent to the MOS device; the output end of the MOS device is connected with the input end of the gallium nitride device, and a corresponding signal is formed according to a received PWM signal and sent to the gallium nitride device; and the gallium nitride device performs on-off action according to the received signal. According to the power supply management chip and the power supply management circuit provided by the utility model, the anti-interference performance, the reliability and the power supply producibility of a gallium nitride device in power supply application can be improved.

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.

Provided is a hybrid buck converter including a first PMOS transistor and a second PMOS transistor electrically connecting a power supply voltage node with a first switching node, a first NMOS transistor and a second NMOS transistor electrically connecting a ground node with the first switching node, an inductor electrically connecting the first switching node with a second switching node, a third NMOS transistor electrically connecting the second switching node with a first output node, a third PMOS transistor electrically connecting the second switching node with a second output node, a shunt regulator that is driven based on a second output voltage of the second output node, a first PWM controller adjusting, based on a pulse width control of first PMOS transistor and first NMOS transistor, a magnitude of an inductor current, and a second PWM controller adjusting, based on a pulse width control of first PMOS transistor and first NMOS transistor, a magnitude of the second output voltage.

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 invention provides a motor control device which randomly selects a plurality of carrier frequency candidates to disperse harmonic components, suppresses the heat generation of switching elements of an inverter, and expands the dispersion of the harmonic components to suppress electromagnetic noise. A motor control device for controlling an inverter that supplies AC power to an AC motor, the motor control device being characterized by being provided with: a carrier frequency generation unit that selects each of a plurality of carrier frequency candidates at a predetermined ratio on the basis of a random number and outputs the selected carrier frequency candidates as a carrier frequency; a carrier generation unit for generating a carrier on the basis of the selected carrier frequency; and a PWM controller that outputs a PWM signal based on the carrier to an inverter, the predetermined ratio being determined based on frequencies of the plurality of carrier frequency candidates and a predetermined maximum average switching frequency.

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.

A split-phase current differential protection method based on inverter control strategy optimization comprises an inverter and a filter which are arranged between photovoltaic power generation equipment and a power grid, an inner loop controller, an outer loop controller, an abc / dq module, a PWM controller, a power calculator, a dq / abc module and a phase-locked loop. The non-fault phase protection sensitivity is reduced while the protection action sensitivity in each phase differential current protection area is improved, maloperation can still be avoided when an external fault occurs, and high reliability is achieved. The method has better anti-transition resistance capability, has better performance when a grid-connected system is a strong power grid or a weak power grid, and has a wider application range compared with the situation that the grid-connected system is connected into the strong power grid only in the past.

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.

The invention discloses a direct-current switching power supply series circuit, which realizes direct-current conversion of input high voltage by connecting direct-current switching power supply modules in series, and realizes synchronous control of working states of a plurality of direct-current switching power supply modules through cooperation of a PWM (Pulse Width Modulation) controller, a synchronous driving controller and an output sampling loop. The circuit is suitable for the application scene of ultrahigh voltage input, and can be widely applied to the technical field of electronic circuits.

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 present application relates to the field of building environment regulation technology, and specifically to an energy-saving regulation method, device and system for building environment, the method comprising: obtaining outdoor wind speed, outdoor temperature, indoor temperature, CO2 concentration and VOCs concentration at each time in each area inside the building; dividing all time into multiple time periods; determining the potential impact coefficient of each time period in each area; determining the regional difference of each time period in each area; determining the short-term impact index of each time period in each area; determining the air conditioning intensity of each area; obtaining the duty cycle of the PWM controller in the air conditioning equipment of each area, and regulating the air of the building environment. The present application can use different regulation strengths for air conditioning in different areas to reduce energy consumption, achieve energy-saving regulation of the building environment, and improve the efficiency of air conditioning in the building environment.