21 results about "Pwm controller" patented technology

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.

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 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.

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.

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.

This invention discloses a converter protection control method, device, and storage medium based on steady-state current prediction. The method includes the following steps: real-time acquisition of the output voltage / current of the controlled converter; inputting the control parameter information of the PWM controller in the controlled converter and the real-time acquired output voltage / current of the controlled converter into the load impedance calculation model, and determining whether the change value of the load impedance of the controlled converter exceeds a preset threshold; if the change value of the load impedance of the controlled converter exceeds the preset threshold, updating the steady-state model of the converter arm current using the current load impedance value to perform steady-state current prediction, and obtaining the predicted steady-state current value of the converter arm; and performing protection control based on the predicted steady-state current value of the converter arm. This invention has the advantages of simple implementation, high efficiency and accuracy of control and protection, fast response speed, and the ability to predict protection in advance.

The present application belongs to the field of integrated circuits, and particularly relates to a control circuit and a control method for preventing reverse of inductive current; the circuit is applied to a synchronous rectification PWM controller on-chip integrated chip, and comprises a comparator circuit, a charge-discharge circuit and a constant current source circuit; the circuits are all analog circuits, and the present application is realized in the mode of analog circuits, and has the characteristics of less components and easy integration; the control circuit of the present application has simple structure and low design complexity; the process compatibility is good, and the on-chip integration is facilitated; the light load comparison reference threshold can be arbitrarily adjusted outside the chip, and has a hysteresis function; the control method of the present application is simple, can avoid frequently enabling the synchronous rectification MOSFET in the process of switching between heavy load and light load, and simplifies the synchronous rectification control method of the PWM controller on-chip integration.

The present application relates to the field of power electronics, in particular to a three-level ANPC topology energy storage converter dead zone implementation system, the system comprises: three-level ANPC topology power circuit, core controller and PWM controller;Three-level ANPC topology power circuit includes twelve semiconductor devices;The PWM controller comprises: 4 signal edge delay module and power device drive signal module;In the present application, the influence of the dead zone on the output positive / negative level width when the rectification, inversion, reactive output operating condition switching and after switching is compensated, the consistency of the level width and delay before and after the switching of various conditions is ensured, and the power quality of the grid-connected current is optimized;And the opening and closing sequence of all switching tubes and the dead zone time always remain consistent, and do not change with the change of PWM modulation signal or power direction signal, which has the advantages of simple control algorithm implementation and good signal path delay consistency.

This utility model relates to the field of circuit design technology, and in particular to a slope compensation circuit for a DC-DC full-bridge converter in peak current mode, including a current transformer T1; the secondary output terminal of the current transformer T1 is connected to the anode of diode D1, and the cathode of diode D1 is connected to one end of resistor R3, one end of resistor R4, and one end of resistor R1 respectively; the other end of resistor R1 is connected to one end of capacitor C1, forming signal point A; the other end of capacitor C1 is connected to signal point B; one end of capacitor C2 is connected to signal point B, and the other end is grounded; one end of resistor R5 is connected to a PWM signal source, and the other end is connected to signal point B. This solution does not require a dedicated constant current source chip, nor does it rely on the slope compensation module integrated inside the controller. It only uses conventional resistors, capacitors, and diodes to construct the slope signal generation path, has strong adaptability, and can be widely used in general PWM controllers without built-in slope compensation functions and various digital control platforms, especially suitable for digital power control systems.

This invention discloses an elevator energy management method considering device lifespan and energy saving optimization in the field of power supply, distribution, and energy storage technology, comprising the following steps: S1, establishing an elevator energy management system, including a voltage regulator G. V (s), voltage regulator G V (s) and PWM controller G d (s) connected, PWM controller G d (s) and isolated bidirectional DC / DC converter G p (s) connected, isolated bidirectional DC / DC converter G p (s) output voltage reference value U * With voltage regulator G V (s) Connected; S2, Calculate and select the parameters of the components and output filters of the elevator energy management system; S3, Establish a peak-transient dual-mode prediction method; S4, Establish a power routing collaborative optimization method; S5, Establish an elevator operating condition identification method; S6, Establish a joint scheduling method based on grid time-of-use pricing information. Applicable to urban high-rise buildings and universities with frequent start-stop operations, this method optimizes charging and discharging control strategies to achieve efficient recovery and utilization of elevator operating energy, while simultaneously improving the reliability of the elevator system.

This application relates to a high-power two-in-one charging device, belonging to the technical field of power supply equipment, comprising: a first power unit and a second power unit capable of being combined and separated; a power unit control circuit and a cooperative communication protocol configured between the first power unit and the second power unit; the internal circuit of at least one of the power units includes: an AC input circuit connected to a rectifier filter circuit and a high-frequency transformer and controlled by a PWM controller; a protocol and main control buck-boost module, which integrates a protocol control unit, a main control MCU, and a BuckBoost circuit; a battery and a protection board circuit connected to the battery; a display control circuit for driving an external TFT display screen; and a parallel bridge output terminal for realizing parallel power output when the first power unit and the second power unit are stacked.

The present disclosure relates to a pulse width modulation controller for a hybrid converter. Provided herein are pulse width modulation (PWM) controllers for a hybrid converter. In certain embodiments, a PWM controller for a hybrid converter includes a threshold generation circuit to generate a threshold signal based on an output voltage of the hybrid converter, a threshold adjustment circuit to generate an adjusted threshold signal based on sensing a voltage of a flying capacitor of the hybrid converter, and a comparator to generate a comparison signal based on comparing the adjusted threshold signal to an indication of an inductor current of the hybrid converter. An output of the comparator is used to generate PWM control signals for turning on and off switches (e.g., power transistors) of the hybrid converter.

The utility model belongs to power ripple relevant technical field, concretely relates to a power output ripple suppression device, including PWM controller, diode D1, coarse filter module, multistage filter module, fine filter module and LDO that connect gradually, the output of coarse filter module is connected with ripple signal acquisition module, and the output of ripple signal acquisition module is connected with controller, the utility model discloses through coarse filter module, multistage filter module, fine filter module, four level structure scheme of LDO, makes the ripple that power output end produces is layered filtering, covers full frequency band, and coarse filter module filters out high frequency ripple preferentially, reduces subsequent filtering pressure, and multistage filter module dynamic adaptation residual specific ripple characteristic, and fine filter module is further high accuracy filtering to middle low frequency ripple, and can through operational amplifier gain compensation signal attenuation that filtering brings, and LDO can further stabilize output voltage, reduce voltage fluctuation, improve the stability and purity of power output, make filtering effect improve significantly.

Provided is a motor control device that outputs voltage to be applied to an AC motor based on an output voltage command value, the motor control device including: a control period determination unit that determines a control period in accordance with a fundamental wave frequency of the AC motor and a cutoff frequency of current control; a control interrupt unit that determines a control interrupt based on the control period determined by the control period determination unit; a current controller that controls the output voltage command value based on the control interrupt determined by the control interrupt unit; and a PWM controller that controls output of voltage by PWM in accordance with the output voltage command value controlled by the current controller. This configuration enables vibration of a current due to a 6n-th-order harmonic current component to be more easily suppressed when control is performed in which a control period is not synchronized with an inverter frequency.

A power converter and its control method are disclosed, wherein the power converter includes: an upper bridge circuit, a lower bridge circuit, an inductor, a first current sensor, a second current sensor, a weighting adjustment circuit, and a pulse width modulation (PWM) controller. The upper bridge circuit receives an input potential. The lower bridge circuit is coupled to a ground node. The upper and lower bridge circuits are operable according to a PWM potential. The inductor is coupled to the upper and lower bridge circuits. The first current sensor monitors the upper bridge circuit to generate a first detection current. The second current sensor monitors the lower bridge circuit to generate a second detection current. The weighting adjustment circuit generates a control current based on the first and second detection currents. The PWM controller generates a PWM potential based on the control current.

This application provides a switching power supply circuit and electronic device. The switching power supply circuit includes: a first primary winding, a second primary winding, a secondary winding, a first switching device, and a second switching device. The first primary winding is connected in series with the first switching device and is connected to a first power input point. The second primary winding is connected in series with the second switching device and is connected to a second power input point. A first PWM controller is connected to the control terminal of the first switching device. A second PWM controller is connected to the control terminal of the second switching device. When power is connected to both the first and second power input points, one of the first and second PWM controllers is enabled, while the other is disabled. This reduces the number of transformers used, lowers operating costs, and reduces the circuit footprint.

This application relates to pixels, display devices including pixels, and electronic devices including display devices. A pixel includes: a light-emitting element through which a driving current flows; a light-emitting element driver that generates the driving current based on a pulse-width modulation (PWM) signal; and a pulse-width modulator that generates a PWM signal based on first data bits to a k-th data bit. The PWM modulator includes: a data writer that writes first data bits to a k-th data bit in response to a scan signal; a PWM controller that stores first data bits to a k-th data bit and sequentially outputs first data bits to a k-th data bit in response to a clock signal; and a PWM signal generator that generates a PWM signal in response to the first data bits to a k-th data bit and a transmit signal.

A system may include an external battery cabinet (EBC) configured to power an uninterruptible power supply (UPS), where the EBC operates at a predetermined battery voltage. The system may include a boost pulse-width modulator (PWM) controller including two or more operating switches and a boost converter coupled to the boost PWM controller, where the boost converter is configured to increase the predetermined battery voltage. The system may include a bypass circuit to allow power to directly flow from the EBC to the UPS. The system may include a voltage sensing circuit configured to measure a voltage of the EBC and the UPS. The system may include a microcontroller configured to generate one of one or more boost signals or one or more bypass signals to activate one of the boost converter or the bypass circuit based on the voltage of the EBC and the UPS.

This utility model relates to the field of power electronics technology, specifically a control circuit for a switching power supply. It includes an AC power supply, a rectifier bridge, a transformer, a PWM controller, a voltage regulator, capacitors, resistors, diodes, transistors, Zener diodes, and an optocoupler. Compared with existing technologies, this utility model uses a fixed-frequency current mode for PWM control, expanding the AC power supply's voltage input range to 90V~240V. Through the transformer, voltage regulator, and circuit feedback compensation, it outputs a 24V DC power supply with a 3A current to power the hardware circuitry of fitness equipment, providing stable and safe high current and high voltage. This utility model has the advantages of simple circuitry, resistance to damage, and reduced production and maintenance costs.