295 results about "Pwm controller" patented technology

Some examples relate to a circuit including a plurality of input pins, a plurality of output pins, a pulse width modulated (PWM) controller, and an inductor-open detection circuit. The PWM controller has a plurality of inputs and a plurality of outputs. The plurality of inputs of the PWM controller are coupled to the plurality of input pins, and the plurality of outputs of the PWM controller are coupled to the plurality of output pins. The inductor-open detection circuit has an input coupled to a pin of the plurality of input pins, and has an output coupled to the PWM controller.

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 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 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.

A direct current to direct current (DC-DC) converter can include a chip embedded integrated circuit (IC), one or more switches, and an inductor. The IC can be embedded in a PCB. The IC can include driver, switches, and PWM controller. The IC and / or switches can include eGaN. The inductor can be stacked above the IC and / or switches, reducing an overall footprint. One or more capacitors can also be stacked above the IC and / or switches. Vias can couple the inductor and / or capacitors to the IC (e.g., to the switches). The DC-DC converter can offer better transient performance, have lower ripples, or use fewer capacitors. Parasitic effects that prevent efficient, higher switching speeds are reduced. The inductor size and overall footprint can be reduced. Multiple inductor arrangements can improve performance. Various feedback systems can be used, such as a ripple generator in a constant on or off time modulation circuit.

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 discloses an LED plant lamp illumination system and method, and relates to the technical field of planting industry, and the LED plant lamp illumination system comprises a central processor which is connected with an intelligent identification module used for carrying out plant classification on data collected by a visual collection module. The shape extraction module, the color extraction module and the image preprocessing module are used in cooperation to extract effective information in image information, and then the classification identification module and the CNN deep learning network unit are used in cooperation to facilitate intelligent identification of plants. The central processing unit can intelligently control the operation of the brightness adjusting unit according to the calculation result of the intelligent identification module, and the brightness of the LED lamp can be adjusted through the power-on operation of the PWM controller and the LED controller, so that the irradiation light source of the LED lamp meets the subsequent planting and growth requirements, the function of intelligently adjusting the brightness of the LED lamp is realized, and the LED lamp is more intelligent. And the automation effect of the using device is improved.

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 invention provides an industrial smoke filtering control system which comprises an air inlet pressure sensor, an air quality sensor, a temperature sensor, a fan PWM controller, a control unit, a man-machine interaction unit and a storage unit, the control unit serves as a core component, and the other components are electrically connected to the control unit. The control unit converts the air inlet pressure into real-time air inlet amount, compares the real-time air inlet amount with preset air inlet amount, adjusts the rotating speed of the fan to enable the real-time air inlet amount to tend to the preset air inlet amount, judges the overload state according to the rotating speed of the fan and the real-time air inlet amount, obtains an alarm state in combination with factors such as filter element working duration, air quality detection and filter element temperature, and gives an alarm. By adjusting the air inlet amount and monitoring and recording the abnormal running state, the technical effects of maintaining the continuous and stable waste gas treatment efficiency of the system and improving the running reliability and safety of the whole machine are achieved, and the stability of the system is obviously improved.

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 present invention relates to a control system and method for a low-voltage DC-DC converter, and the control system may include a low-voltage DC-DC converter unit, which includes a power semiconductor element and converts power supplied by a high-voltage battery of a vehicle into low-voltage power. A switching frequency changing unit changes the switching frequency of the power semiconductor element, and a microcomputer generates a final PWM signal based on an input voltage value input from the high-voltage battery and an output voltage value of the switching frequency changing unit to apply a maximum duty cycle command voltage to a PWM controller. The PWM controller applies a PWM voltage to the power semiconductor element to operate the power semiconductor element to work in a manner less than a maximum duty cycle based on the maximum duty cycle command voltage applied from the microcomputer.

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.