24results about How to "Small output ripple" patented technology

The invention belongs to the field of power management in analog integrated circuits, and particularly relates to a digital auxiliary analog low dropout regulator without an off-chip capacitor. Comprising a control module, a band-gap reference circuit, a transient enhancement circuit, a transient enhancement power tube group, an analog loop and a digital loop, in a load steady state, an analog LDO is adopted as a main control scheme, a high-gain amplifier can obtain accurate output voltage, and limit cyclic oscillation does not occur. A digital LDO is called as a main control scheme only when a load transient occurs, so that the speed is increased, the quiescent current is reduced, and the switching noise is suppressed. On-chip integration, high-precision output voltage, wide load current range, fast transient response speed, high-efficiency power tube area utilization rate and low output ripple can be realized. The circuit is suitable for SoC modular power management and digital IP load.

The present invention relates to a novel power adapter and a working method thereof, comprising a rectifier filter circuit, a flyback circuit, a compensation circuit and a control circuit, wherein the rectifier filter circuit is connected to the flyback circuit, and the flyback circuit and the compensation circuit are both electrically connected to the control circuit; the flyback circuit is connected to the compensation circuit; the compensation circuit comprises a secondary compensation winding W2, a first diode D1, and a compensation capacitor C a and a DC-DC circuit; one end of the secondary compensation winding W2 is connected to the anode of the first diode D1, and the other end of the secondary compensation winding W2 is connected to the compensation capacitor C a The cathode of the first diode D1 is connected to the compensation capacitor C a The other end is connected to the DC-DC circuit; the DC-DC circuit is connected to the flyback circuit and the control circuit respectively. The semiconductor device in the compensation circuit of the present invention starts to work only when the input voltage is too low to meet the output power, which effectively reduces the switching loss and is conducive to improving the efficiency of the whole machine.

The invention discloses an OCL-LDO circuit which comprises a band-gap reference unit, a super source follower, a biasing circuit, a power transistor MP, an error amplifier, a flip voltage follower, a frequency compensation unit and a high-pass network. The invention introduces a unique output-capacitance-free low dropout regulator (OCL-LDO), and the core of the regulator is a flip voltage follower (FVF) which is embedded with a super source follower (SSF) and a high-pass network and has push-pull capability. According to the structure, the super source follower (SSF) with a high-pass network is ingeniously fused and is embedded in the flipping voltage follower (FVF), so that the transient response is remarkably improved.

The invention provides an integrally-formed inductor and a preparation method and application thereof. The integrally-formed inductor comprises at least one heat dissipation copper sheet and at least one magnetic core. The heat dissipation copper sheet comprises a central electrode part, a winding part, a heat dissipation part and an outer electrode part which are integrally connected in sequence; the heat dissipation part is arranged on the outer surface of the magnetic core; the heat dissipation copper sheet is wound by taking the central electrode part as a starting point; the magnetic core is filled in the winding part of the heat dissipation copper sheet; the magnetic core is an integrally formed magnetic core. The integrally-formed inductor has the high-density characteristic, the magnetic core and the winding are tightly combined, good heat conduction and heat dissipation effects are achieved, the inductor is kept at the low working temperature, meanwhile, the heat dissipation copper sheets can dissipate heat of the inductor, and the overcurrent capacity of the inductor can be improved.

The present invention discloses a high-stability, low-ripple high-voltage DC converter. The high-voltage DC converter includes a full-bridge inverter circuit, a resonant filter circuit, a transformer, and a voltage doubler rectifier circuit connected in sequence: wherein the voltage doubler rectifier circuit is formed by cascading a plurality of voltage doubler modules; the output ends of a plurality of the voltage doubler modules are connected in series to form a high-voltage DC output; each of the voltage doubler modules is formed by connecting a plurality of voltage doubler units in parallel and output in series and then connecting them in parallel with a bus capacitor; all bus capacitors are connected in series in sequence and then connected to the load. The voltage doubler rectifier circuit in the scheme of the present invention reduces the average current value and voltage variation on the capacitor and reduces the output ripple without increasing the device voltage level; at the same time, it reduces the total output voltage variation when the load changes, reduces the voltage regulation range of the resonant cavity, and improves the output voltage stability.

The embodiment of the present application discloses a control method of an LLC resonant circuit and an LLC resonant circuit. The LLC resonant circuit includes a control module and a resonant module, and the resonant module includes at least two switching devices. The method includes: the control module obtains a DC voltage component and an AC voltage component included in the input voltage of the resonant module. The control module determines a target frequency based on the DC voltage component, the AC voltage component and the output voltage of the resonant module. The control module generates a target drive signal based on the target frequency. The control module turns on or off the at least two switching devices through the target drive signal. By adopting the embodiment of the present application, the problem of the presence of an AC component in the output of the LLC resonant circuit due to the presence of an AC component in the input can be reduced or eliminated, the output ripple of the LLC resonant circuit can be reduced, and the performance of the LLC resonant circuit can be improved.

The invention relates to an all-vanadium redox flow battery DCDC type equalization system and an electric energy equalization method thereof. The system comprises a DCDC equalizer, a PCS energy storage converter and a redox flow battery subsystem. The positive electrode of the flow battery subsystem A is connected with the input positive electrode In + of the DCDC equalizer after passing through the switching circuit Q1, the negative electrode of the flow battery subsystem A is connected with the output positive electrode Out + of the DCDC equalizer after converging with the positive electrode of the flow battery subsystem B and passing through the switching circuit Q2, and the negative electrode of the flow battery subsystem B is connected with the input negative electrode and the output negative electrode Bus-of the DCDC equalizer. A plurality of power loops are arranged in the DCDC equalizer, one end of an inductor on each power loop is connected with an output positive electrode Out +, and the other end of each inductor is connected with an input positive electrode In + and an input negative electrode In-through a switch tube. On the premise of not depending on the energy of the power grid, the electric quantity balance control among the flow battery subsystems is realized, so that the performance and the reliability of the whole system are improved.

The application relates to an LCD display panel DC-DC circuit for inhibiting strong vehicle-mounted surges. The LCD display panel DC-DC circuit for inhibiting strong vehicle-mounted surges comprises an input protection module and a step-down output module. The input protection module comprises an input end, a first damping unit, a first filter unit, a surge clamping unit, a second filter unit, a second damping unit and a buffer unit. The first damping unit is electrically connected with the input end, the first filter unit is electrically connected with the first damping unit, the surge clamping unit is electrically connected with the first filter unit, the second filter unit is electrically connected with the surge clamping unit, the second damping unit is electrically connected with the second filter unit, and the buffer unit is electrically connected with the second damping unit. The step-down output module is electrically connected with the buffer unit. The scheme provided by the application can perform input protection on the vehicle-mounted DC-DC circuit, thereby effectively inhibiting the transient high voltage generated by the vehicle-mounted load throwing and protecting the step-down chip and the subsequent circuit.

The utility model relates to the technical field of start-stop controllers, in particular to an automatic start-stop controller for a motorcycle. The controller comprises a shell and a circuit board fixedly connected with the shell, a main chip, an MOS bridge and a driver which are connected are arranged on the circuit board, heat dissipation elements are connected to the side, away from the circuit board, of the shell, the heat dissipation elements are distributed on the shell at intervals, a heat dissipation boss is arranged in the shell, a gap is formed between the heat dissipation boss and the circuit board, and the heat dissipation boss corresponds to the main chip in position. Compared with the prior art, the start-stop controller has the advantages that the heat dissipation effect of the start-stop controller is improved, the service life of the chip is further prolonged, and the like.

The invention discloses a control method and device based on a current type rectifier, electronic equipment and a medium, and the method comprises the steps: obtaining the network side voltage, network side current and AC side capacitor voltage data of the current type rectifier at a first moment, and calculating the input current data at the first moment, the input current data is determined according to the switching state of a rectifier bridge in the current type rectifier at the previous moment; inputting the sampling data and the current data into a pre-established prediction model to predict a state variable, calculating a grid-side input current based on the state variable and the input current corresponding to different switching states, calculating a grid-side reference current at the direct current side of the current type rectifier by adopting proportional-integral control based on an instantaneous power theory, and calculating the grid-side reference current according to the grid-side reference current. The cost model is established based on the grid-side reference current and the grid-side input current, and the switch state corresponding to the minimum value is calculated by the cost model to control the rectification output of the current type rectifier at the target moment, so that the rectification output is well controlled, and the output ripple is small and the quality is high.

The invention discloses a low-power-consumption and strong-driving-capacity reference voltage buffer applied to an SAR ADC, and belongs to the technical field of reference voltage buffers.The reference voltage buffer is composed of three parts of circuits, the first part is a two-stage operational amplifier circuit of an output source follower, the second part is an output buffer circuit, and the third part is a second-stage operational amplifier circuit of an output source follower. The third part is a dynamic current enhancement circuit; wherein the output of the two-stage operational amplifier circuit is used for providing bias voltage for the output buffer circuit; the output buffer circuit is an open-loop source follower, and the output of the output buffer circuit is used for providing reference voltage for the ADC; the dynamic current enhancement circuit generates current pulses with adjustable size and pulse width through control signals of an ADC sampling clock and a conversion clock. According to the invention, the power consumption is reduced, the driving capability of the buffer is enhanced, the output ripple of the reference voltage is reduced, and the circuit has very strong engineering significance in the design of a fully-integrated high-speed high-precision SAR ADC (Synthetic Aperture Radar Analog to Digital Converter).

The utility model discloses a low-ripple adjustable power supply circuit which comprises a power supply module, a first voltage dividing module, a voltage adjusting module, an LDO linear voltage stabilizing module and a differential amplification module. The output end of the voltage regulation module is connected with the first input end of the LDO linear voltage stabilization module, and the output end of the voltage regulation module is further connected with one input end of the first voltage division module. The other input end of the first voltage dividing module is connected with the power supply module; the output end of the differential amplification module is connected with the second input end of the LDO linear voltage stabilization module, the first input end of the differential amplification module is connected with the positive electrode VOUT + of the power supply module to serve as the output positive electrode VOUT1 + of the power supply circuit, and the second input end of the differential amplification module is connected with the output end of the LDO linear voltage stabilization module to serve as the output negative electrode VOUT1-of the power supply circuit. The circuit provided by the utility model has the advantages of obvious ripple suppression effect and low cost, and is particularly suitable for being applied to the fields with wide adjustable output voltage and smaller ripple requirements.

The invention discloses an ISOP type two-stage converter for formation and capacity grading of a lithium battery, and the converter comprises a pre-stage Buck circuit which is used for carrying out the preliminary step-down processing of an input voltage, and outputting a stable DC voltage through adjusting the duty ratio of a switching tube; the rear-stage LLC resonant converter is connected with the front-stage Buck circuit in series and comprises a plurality of resonant units which are connected in parallel in an interleaving manner, and each resonant unit comprises a half-bridge circuit, a resonant network, a high-frequency isolation transformer and a bidirectional full-bridge rectifying circuit; the control module outputs a control signal; the control signal adjusts the output voltage by changing the duty ratio of the preceding-stage Buck circuit, so that the LLC resonant converter works at the optimal resonance point. The device is suitable for being used in high-power battery formation and capacity grading occasions, has the characteristics of self-current-sharing and self-voltage-sharing, improves the power supply efficiency, and realizes wide-range voltage regulation.

This invention provides a multi-phase output clock circuit and method for high-power power supply management. Flip-flop FF0 receives the clock signal CLK generated by the system's internal oscillator and divides CLK by two to obtain clock signal CLK1. Flip-flops FF1, FF2, and FF3 form a state machine structure unit, which divides CLK1 by six to output three phase-shifted clock signals. The clock input of flip-flop FF4 is connected to the clock signal CLK1N obtained from CLK1 via an inverter, and is used to output another phase-shifted clock signal. The generation of the multi-phase clock can be used as the operating clock for multiple parallel converters. In this form, each converter handles a relatively small current, reducing output ripple, power loss, and efficiency, while also lowering costs.

The utility model discloses a driving power supply, belongs to the technical field of LED dimming driving power supplies, and particularly relates to an ultrahigh frequency gallium nitride LED dimming driving power supply which comprises an input circuit, a PFC power factor correction circuit, an LLC half-bridge circuit, an output circuit and an LED. The input end of the PFC power factor correction circuit is connected with the input circuit and inputs working voltage, the output end of the PFC power factor correction circuit is connected with the input end of the LLC half-bridge circuit, and the output end of the LLC half-bridge circuit is connected with the output circuit and outputs voltage to the LED. According to the utility model, the circuit topology is BoostPFC + LLC half-bridge two-stage to obtain high efficiency and low output ripple without stroboflash. The driving power supply has the advantages that constant-voltage output is achieved, a PWM light modulator can be connected between the output and an LED, the light modulation purpose is achieved, the driving power supply can adapt to more light modulators, the light modulation performance is more excellent, and flicker is avoided.

The invention discloses a charge pump circuit and a chip, relates to the field of integrated circuit design, and solves the problems that a traditional charge pump circuit is complex in control, low in fixed flexibility of a control time sequence, large in output ripple and low in efficiency. The charge pump circuit comprises: a voltage output terminal for providing an output voltage; the charge pump module comprises N basic units, each basic unit comprises an energy storage unit, N is a positive integer, the N basic units are connected in series and in parallel, one ends of the N basic units are connected to power supply voltage, the other ends of the N basic units are grounded, and each basic unit is connected with the voltage output end; and the control module is respectively connected with each basic unit and the voltage output end, and is used for detecting the magnitude of the output voltage and controlling charging and discharging of the N basic units according to a comparison result of the output voltage and a preset voltage so as to provide load current for a load.

The invention discloses an LDO (Low Dropout Regulator) control circuit, an LDO control method and a chip, relates to the field of integrated circuit design, and solves the problems of low LDO efficiency and large output ripple of a charge pump circuit when power is supplied through the LDO or the charge pump circuit. The LDO control circuit comprises a power tube used for controlling connection and disconnection between a power supply and a load; the source following power tube is connected with power supply voltage and is connected with the power tube; the charge pump module is connected to two sides of the source following power tube in parallel; and the power supply voltage detection module is connected with the source following power tube and the charge pump module, and is used for detecting the magnitude of the power supply voltage and controlling the on-off of the charge pump module according to the power supply voltage and a preset voltage so as to provide load current for a load.

The utility model relates to a kind of low-power low-cost power supply circuit and conference system host power, comprising: input processing module, input filter module, control module, push-pull drive module, voltage conversion module and voltage output module;The input end of input processing module is connected to external power supply, the input end of input processing module, input filter module, control module and voltage conversion module are connected to the output end, push-pull drive module is connected with the input end of voltage conversion module and the drive end of control module respectively, the input end of voltage conversion module is connected with the output end of voltage output module, and the output end of voltage output module outputs multiple groups of power supply signals.The power supply circuit of the utility model can significantly reduce electromagnetic interference, reduce output ripple, improve power stability and reliability, and can simplify circuit design, voltage conversion efficiency is high, and can meet the design requirements of conference host.

The utility model relates to an LLC resonant converter which comprises a commercial power conversion circuit, a control circuit, a high-voltage resonant controller circuit, a drive circuit, an LLC circuit and a secondary rectification filter circuit. The control circuit, the high-voltage resonance controller circuit, the drive circuit, the LLC circuit and the secondary rectification filter circuit are connected in sequence, and the control circuit is connected with the secondary rectification filter circuit and used for receiving sampling values of the secondary rectification filter circuit and outputting mode control signals corresponding to different working modes to the high-voltage resonance controller circuit according to the sampling values. The high-voltage resonance controller circuit outputs different PWM signals to the drive circuit according to mode control signals, outputs a first PWM signal in a normal mode and outputs a second PWM signal and a modulation wave of a high-frequency first signal in a burst mode, the drive circuit drives the LLC circuit to work according to the PWM signals, the secondary rectification filter circuit outputs high-frequency voltage, and output ripples are reduced.

The invention relates to a construction method of a direct-current power supply system of a multi-beam solid-state transmitter. The direct-current power supply system comprises a proportional converter part, a voltage-stabilized source circuit part, a state acquisition circuit part and a transmitting controller part. The proportional converter circuit converts input direct-current voltage into intermediate voltage and sends the intermediate voltage to the stabilized power supply circuit, and the state acquisition circuit acquires input power and current of the proportional converter circuit and output voltage and current of the stabilized power supply circuit, acquires temperature of power devices of the proportional converter circuit and the stabilized power supply circuit and performs networking through a CAN bus. Collected signals are sent to the emission control circuit, and the emission control circuit processes the collected signals, sends the processed signals to the master control circuit and controls a power input switch of the proportional converter circuit at the same time. The direct-current power supply of the multi-beam solid-state transmitter has the characteristics of wide input voltage range, high efficiency, high reliability and the like.

The application provides an adaptive control circuit of a switching converter and the switching converter. The adaptive control circuit performs error operation on an output feedback voltage and a first reference voltage to obtain a compensation signal, performs error amplification on a current sampling signal representing an average current of an inductor and the compensation signal to obtain a second error signal, compares a first ramp signal with a first slope and the second error signal to generate a first comparison signal, compares a second ramp signal with a second slope and a second reference voltage to generate a second comparison signal, and compares a third ramp signal with a third reference voltage to generate a third comparison signal. The first comparison signal, the second comparison signal and the third comparison signal are used to control the switching state of a main switch. The application makes the switching period of the main switch change with the load of the switching converter.

The application provides a power supply control system and method, and a power supply, and relates to the technical field of power electronics. The system comprises: a sampling feedback module for obtaining an operating parameter feedback signal of a main circuit of the power supply; a digital control module for generating an analog reference signal according to a target output parameter and the output parameter feedback signal; an analog control module comprising an output parameter outer loop, an inductance current middle loop and a peak current inner loop, for generating a wave generation control signal according to the analog reference signal and the operating parameter feedback signal; and a drive signal generation module for generating a drive signal for controlling a power switch tube in the main circuit of the power supply according to the wave generation control signal. The application can take into account the control flexibility, output precision, low output ripple, dynamic response performance and current limiting protection reliability of the power supply.

The present invention discloses a method for reducing output ripple of a modular parallel high-power direct current power supply. By dividing a pulsation cycle into different time delays, the output current ripple peaks and valleys are staggered to achieve the purpose of reducing ripple. The method is mainly aimed at a research system composed of 12 three-phase isolated AC-DC-DC power supply modules connected in parallel. By combined control of each module, the 12 modules are divided into 4 groups of control units, each control unit controls 3 modules, and the modules and controllers are respectively delayed at different times to reduce the system output ripple, thereby realizing a control method for delayed current sharing. The present invention can stagger the current ripple peaks by reasonably selecting the delay time, thereby reducing the system output ripple, and can stagger the current ripple peaks by reasonably selecting the delay time, which can effectively reduce the system output ripple amplitude, thereby reducing the ripple, improving the output current quality and improving the power quality.

The invention discloses a high-power water electrolysis hydrogen production converter suitable for a new energy scene, and the technical scheme is that the high-power water electrolysis hydrogen production converter suitable for the new energy scene comprises a power grid, a rectification unit, a conversion unit and a load; the rectification unit is a multi-level rectifier, the input end is in three-phase alternating current connection with the output end of a power grid, and the output end is a direct-current bus which is provided with a plurality of first capacitors in series. The conversion unit comprises a plurality of LLC resonant conversion modules; the input end of the LLC resonant conversion module is connected with the two ends of the corresponding first capacitor; the output ends of the LLC resonant conversion modules are connected in parallel with the two ends of a load. The high-power water electrolysis hydrogen production converter suitable for the new energy scene has the advantages that the high-power water electrolysis hydrogen production converter suitable for the new energy scene meets the high-power and high-current operation scene and the low-voltage output requirement of a hydrogen production system, fault redundancy control is achieved, and the electric energy conversion efficiency under wide-power-range fluctuation is improved.