189 results about "Buck converter" patented technology

The invention discloses a multiphase BUCK converter and a high-dynamic self-adaptive phase cutting method. The multiphase BUCK converter comprises a 16-phase power level, a current sampling module, an MOS driving module, a digital control module, a CMCOT simulation main control loop and a dynamic detection circuit. The MOS driving module controls a switching tube in the 16-phase power level, the current sampling module collects an inductive current signal, the input end of the CMCOT simulation main control loop is connected with the output end of the current sampling module, and a PWM control signal is output to the digital control module; the input end of the dynamic detection circuit is connected with an output signal of a voltage loop gain in the CMCOT analog main control loop, and a mark signal is generated and output to the digital control module; the digital control module generates a phase cutting signal. A phase cutting strategy is correspondingly provided, the number of PWM started by a phase cutting signal is adaptively changed, the transient voltage undershoot is reduced, meanwhile, voltage overregulation is avoided, and the transient performance is remarkably improved.

The invention discloses an adaptive mode switching circuit of a BUCK converter for COT control. The adaptive mode switching circuit comprises a conduction time generation circuit, an OR gate, phase inverters INV1, INV2 and INV3, an NAND gate, an AND gate, RS triggers RS1 and RS2, transistors Mon, MN1, MN2 and MN3, a falling edge delay circuit, a rising edge delay circuit and a zero cross detection circuit. According to the invention, a conduction signal and a zero-cross detection signal are fed back to the conduction time generation circuit, the states of two paths of control signals in a DCM mode and a CCM mode are adaptively adjusted, logic operation is carried out on the control signals through an OR gate, and the conduction time of an upper tube is adaptively adjusted. When the DCM mode is switched to the CCM mode, the CCM control signal serves as a conduction time control signal, and the conduction time of an upper tube is increased; and when the CCM mode is switched to the DCM mode, the DCM control signal is used as a conduction time control signal, and the conduction time of the upper tube is reduced.

The invention discloses a DC-DC converter parameter identification method based on digital twinning, and the method comprises the following steps: firstly building a Buck converter simulation model, collecting needed data from the simulation model, building a mathematical model according to a Buck converter circuit structure, KCL and KVL, and carrying out the calculation of the Buck converter simulation model. And solving a differential equation of the mathematical model by using a Runge-Kutta method to obtain calculation data, substituting the collected simulation data and calculation data into a target function, performing iterative optimization on the target function value by using a Kirchhoff's law optimization algorithm, and outputting an optimal solution of a to-be-identified parameter, namely an identification value of the circuit parameter. According to the method, the parameter identification error of the DC-DC converter can be reduced, and the accuracy is improved.

The invention discloses a high-precision BUCK converter with variable time-constant virtual ripple compensation, and relates to the technical field of circuits, a control logic and driving module drives a high-side and low-side switch group according to a control voltage so as to convert an input voltage into a square wave voltage of a switch node, and forwards the control voltage; the LC filter is used for filtering the square wave voltage and outputting steady-state output voltage; the variable time constant ripple injection circuit generates a fixed ripple voltage by extracting an average voltage value of the square wave voltage, and adjusts the size of a time constant by controlling the voltage to generate an alternating current ripple voltage based on the square wave voltage to generate an alternating current compensation ripple voltage; the feedback resistor group divides the output voltage to generate feedback voltage; and the loop comparator compares a superposed voltage obtained by superposing the alternating current compensation ripple voltage and the feedback voltage with a reference voltage to generate a control voltage, so that the high-precision BUCK converter which is simple in structure, high in dynamic response speed and high in steady-state precision is provided.

The invention discloses a sensorless control method for an electrically excited synchronous motor based on a rotor switching signal, and relates to the technical field of motor control, the inherent high-frequency modulation switching signal of an EESM rotor circuit (in a buck converter form) is utilized, and an effective stage (AS) and an ineffective stage (IAS) are divided based on the unipolarity characteristic of a rotor modulation voltage; a stator current gradient is directly calculated at the AS to extract position information, a fundamental current component is estimated at the IAS to be used for compensation, magnetic coupling saturation compensation and rotor PWM frequency optimization are combined, and full-rotating-speed sensorless control is achieved.

The invention relates to a DC-DC converter control method based on an intelligent agent reinforcement learning algorithm, and the method comprises the steps: firstly building an intelligent agent for a DC-DC buck converter which supplies power to a constant-power load, obtaining a state observation quantity formed by all preset environment variable values of the DC-DC buck converter through the intelligent agent, and obtaining the state observation quantity of the DC-DC buck converter; and a reward value corresponding to a difference value between the output voltage and a preset reference voltage is processed by the intelligent agent, and a corresponding action signal is output and used for controlling the DC-DC buck converter. And then through reinforcement learning training of the intelligent agent, the trained model controls the DC-DC buck converter, so that the output voltage of the DC-DC buck converter has good adaptivity and dynamic response characteristics under different working conditions, and the designed intelligent agent has good steady-state performance in application, so that the stability of the DC-DC buck converter is improved. Model parameter uncertainty caused by component aging can be dealt with, and the stability in practical application is ensured.

The utility model discloses a generator control device, a gas generator system and an aircraft, the generator control device comprises an automatic control unit, a sensing unit and a rectification unit, the generator is connected with a turbine of a turbojet engine through a main shaft, and the generator is connected with electric equipment. The automatic control unit is connected with an oil pump of the turbojet engine, electric equipment, the sensing unit and the rectifying unit, the sensing unit comprises a rotating speed sensor connected with a main shaft, the rectifying unit comprises a diode rectifier bridge and a buck-boost converter, the generator is connected with the diode rectifier bridge, and the diode rectifier bridge is connected with the buck-boost converter. And the buck-boost converter is connected with electric equipment. The power supply can stably output electric energy according to the requirements of electric equipment, ensures that the output voltage is stable, and meets the requirements of the electric equipment.

The present specification relates to the technical field of power electronics, and particularly relates to a multi-element heterogeneous hydrogen production power supply and a control method. The power supply comprises a main branch and an auxiliary branch. The main branch comprises a first rectifier circuit and a Buck converter. An input end of the first rectifier circuit is connected with a first output winding of a transformer, an output end of the first rectifier circuit is connected with an input end of the Buck converter, and an output end of the Buck converter is connected with a first end of a DC bus. The main branch is used for providing steady-state power. The first rectifier circuit is an uncontrolled rectifier circuit. The auxiliary branch comprises a second rectifier circuit and a full-bridge circuit. An input end of the second rectifier circuit is connected with a second output winding of the transformer, an output end of the second rectifier circuit is connected with an input end of the full-bridge circuit, and an output end of the full-bridge circuit is connected with the first end of the DC bus. The auxiliary branch is used for transmitting fluctuating power or AC excitation. The embodiments of the present specification can balance between steady-state high efficiency and dynamic fast response.

The invention relates to the technical field of buck-boost converters, and discloses a phase control circuit and method, and a buck-boost system. According to the phase control circuit provided by the embodiment of the invention, the edge change rate of the phase-cut inductive current is slowed down by processing the phase-cut signal, so that when the double-phase reverse buck-boost converter performs phase cutting based on the phase-cut signal, one single-phase buck-boost converter can enter or exit softly, and the other single-phase buck-boost converter can enter or exit softly. Therefore, the ripple of the load voltage signal at the output end of the dual-phase reverse buck-boost converter is ensured to meet the design requirement, and the load connected with the dual-phase reverse buck-boost converter is prevented from working abnormally.

This invention discloses a control method, device, and system for suppressing current ripple in a coreless brushed DC motor, belonging to the field of DC motor control. The method includes: using an H-bridge Buck converter as the driving topology to provide smooth voltage; designing a state feedback controller based on its state-space model to adjust the dynamic current response; simultaneously designing nonlinear disturbance observers to compensate for matched disturbances in the inductor branch and unmatched disturbances and their derivatives in the capacitor branch; innovatively designing a multi-channel quasi-resonant proportional-integral resonant observer to observe and compensate for the unmatched periodic disturbances caused by motor component commutation, with higher precision; and finally synthesizing a composite control law to drive the motor. The device and system correspondingly implement the above method. Compared with higher-order disturbance observers, the multi-channel quasi-resonant proportional-integral resonant observer proposed in this invention significantly improves the compensation capability for unmatched periodic disturbances, effectively suppressing current ripple in the coreless motor and improving torque stability.

The application discloses a kind of Buck converter operating state online detection methods under CCM mode, parallel a known capacity capacitor at the output of Buck converter, collect the output voltage ripple before parallel capacitor and the output voltage ripple after parallel capacitor, then combine the average value of output voltage, the parameter of output filter capacitor can be calculated, and the performance of switching power supply will not be affected by parallel capacitor;Without additional excitation auxiliary measurement, without disassembling power supply, the operating state of Buck converter can be detected online, and Buck converter is not impacted in any way;In the long-term operation process of Buck converter, the working state and aging condition of Buck converter can be judged according to the parameter of capacitor, to achieve the purpose of Buck converter fault detection.

A method (100) for determining optimized operating point control parameters for controlling an inductive transformer (1) with a buck converter (12) and bridge circuit (13) for driving a rotor (40) of a separately excited electrical machine is disclosed, comprising: acquiring transmission powers (110) of the inductive transformer (1); acquiring temperatures (110) of a transformer (30) of the inductive transformer (1); acquiring cooling temperatures (110) of at least one power semiconductor element of the buck converter (12) and / or at least one power semiconductor element of the bridge circuit (13); acquiring primary DC link voltages (110) of the inductive transformer (1); determining an operating characteristic map (120) of the inductive transformer using the transmission power, the temperatures, the cooling temperatures and the primary DC link voltages;Determining a minimum operating point control parameter and a maximum operating point control parameter (130) using the operating characteristic map corresponding to an operating point to provide a required transmission power of the inductive transformer (1); determining a total power loss (140) of the inductive transformer (1) using the operating characteristic map corresponding to the operating point; and determining the optimized operating point control parameter (150) for the operating point at which the total power loss is minimized, using the minimum operating point control parameter and the maximum operating point control parameter.

The electronic device may include: a first charger including any one of a battery buck converter, a boost converter, or an LDO regulator; a second charger including a power converter that increases an input current supplied from an external device by a specified factor, and outputs the increased current, and decreases an input voltage supplied from the external device by a specified factor, and outputs a reduced voltage; and a processor. The processor can: identify whether an external device can adjust an output voltage and / or an output current based on the external device being connected; supplying a charging current by using a second charger based on the external device being in a state in which the setting of the output voltage and / or the output current is fixed; and supplying the charging current to the battery by additionally using the first charger based on the charging current of the electronic device supplied by the second charger having dropped below a maximum output current value of the external device.

This invention discloses a load transient detection circuit for a COT Buck converter, along with a corresponding COT Buck and a switching power supply. The load transient detection circuit includes an input terminal, three resistors connected in series, two comparators, and a switched-capacitor sample-and-hold circuit. The input terminal is grounded after passing through the three resistors. The nodes between the input terminal and the first resistor, and between the second and third resistors, are connected to the input terminals of the first and second comparators via the switched-capacitor sample-and-hold circuit. The valley and peak voltage information of the inductor current is obtained through the switched-capacitor sample-and-hold circuit. By comparing the inductor current ripple with the valley and peak values, a transient change in the load is determined, ensuring that the switching power supply has a suitable transient detection trigger threshold voltage under any load. The COT Buck of this invention increases the on or off time based on the output signal of the load transient detection circuit to enhance the transient response speed.

The application discloses an isolated three-level soft-switching boost-buck converter, and belongs to the technical field of power converters. The converter comprises a primary conversion module, an isolated conversion module, a first secondary conversion module and a second secondary conversion module. The second secondary conversion module comprises a first switch, a first end of the first switch being connected to a first end of an output voltage, a second end of the first switch being connected to a first end of a second switch and a first end of a first inductor, a second end of the first inductor being connected to a first output end of the first secondary conversion module, a second end of the second switch being connected to a second end of the output voltage and a second output end of the first secondary conversion module, the first switch and the second switch being complementary to be turned on, and the first switch being turned off when a first inductor current drops to a minimum negative current for realizing soft switching. The application realizes zero-voltage turn-on in a full mode and a load range, minimizes an effective value of the inductor current, and takes into account multiple targets such as high frequency, miniaturization and high efficiency.

The utility model provides a buck-boost test device and a buck-boost conversion system, the device comprises an upper computer, a high-voltage power supply and at least one port circuit group, and the port circuit group comprises a first detection interface circuit; the output end of the upper computer is connected with each power tube of the target buck-boost converter; the high-voltage power supply is connected to the output side of the target buck-boost converter in parallel; the first detection interface circuit comprises a first connecting end, a second connecting end and a third connecting end, the first connecting end is connected with an input negative bus of a target buck-boost converter, the second connecting end is connected with an input positive bus of the target buck-boost converter, and the third connecting end is connected with an output positive bus of the target buck-boost converter; during testing, the second connecting end is in short circuit with the first connecting end or the third connecting end. The problem that according to an existing converter testing scheme, current and voltage stress is generated due to ceaseless disassembly and assembly, and a power tube is damaged is solved.

The present invention relates to a charging system (1) having at least one DC power connector (2, 3) and at least one AC power connector (8) and a battery power connector (6), wherein the battery power connector (6) is capable of being connected to a battery (7), particularly a vehicle high-voltage battery (7), wherein at least one AC power connector (8) is connected to a rectifier (10), wherein a first DC voltage converter (11) is present. Electrical energy or current can be distributed in a highly efficient and optimized manner by means of a first DC voltage converter (11) connected to the DC side of a rectifier (10), wherein the first DC voltage converter (11) is configured as a boost / buck converter, wherein a current isolation element (12) is connected to the first DC voltage converter (11) and a battery power connector (6), wherein at least one DC power connector (2, 3) is connected to the rectifier (10) and the first DC voltage converter (11) via a first switch group (S1a), and is connected to the first DC voltage converter (11) and the current isolation element (12) via a second switch group (S1b).

A semiconductor package includes a leadframe, a low-side metal-oxide-semiconductor field-effect transistor (MOSFET), an electronic fuse MOSFET, a high-side MOSFET, a metal connection, a gate driver, an electronic fuse IC, and a molded package. A step-down converter includes a smart power stage (SPS) network and an electronic fuse solution network. The SPS network includes a high-side switch, a low-side switch, and a gate driver. A drain of the low-side switch is coupled to a source of the high-side switch via a switch node. The gate driver is coupled to a gate of the high-side switch and a gate of the low-side switch. The electronic fuse solution network includes a sense resistor, an electronic fuse switch, an electronic fuse integrated circuit (IC), and an SD circuit.

The invention provides a synchronous step-down control chip and an application circuit, and relates to the technical field of switching power supplies, and the synchronous step-down control chip is characterized in that an error amplifier module inputs a reference voltage generated by a band-gap reference module at a positive phase input end, inputs a feedback voltage of a step-down converter module at a negative phase input end for error amplification processing, and outputs an error amplification voltage; the current sampling module obtains a sampling signal and superposes the sampling signal with the slope compensation voltage generated by the slope compensation module to obtain a sampling compensation voltage; the comparator module carries out processing according to the error amplification voltage and the sampling compensation voltage and outputs a modulation signal; the trigger module outputs a control signal according to the modulation signal and a conduction signal generated by the self-adaptive conduction module, and the logic driving module controls the conduction and cut-off of a power switch tube in the buck converter module. According to the invention, the influence of disturbance current during inductive current sampling is effectively reduced, and stable output of an output voltage signal is realized by controlling the conduction and cut-off of a power switch tube in the buck converter module.

The application discloses a single-sensor digital control method of a three-level flying capacitor step-down converter, and comprises the following steps: analyzing the working mechanism of the three-level flying capacitor step-down converter circuit, including the on-off logic of each switching device during normal operation of the circuit, four static working modes and two dynamic working switching modes; taking a static working mode point (1, 0) as an example to analyze the influence of flying capacitor voltage balance on the normal operation of the circuit; aiming at the flying capacitor voltage balance problem of the three-level flying capacitor step-down converter circuit, a single-sensor digital control strategy is provided; an improved digital control strategy is provided; then, stability analysis is carried out on the algorithm; aiming at the digital control algorithm with subharmonic oscillation, a solution strategy is provided, a digital slope compensation technology is introduced, and the subharmonic oscillation problem existing in the algorithm is eliminated; based on the deduction of the digital valley voltage control technology, the digital peak voltage control technology is summarized and extended.

The invention provides a buck-boost converter and a control circuit thereof, and the control circuit comprises a mode selection unit which compares an input voltage with an output voltage, and generates a mode selection signal; the control unit is used for generating control signals of each power switch based on the inductive current sampling signal, the inductive current valley threshold signal and the first time signal in a buck stage of the buck-boost converter, and generating control signals of each power switch based on the inductive current valley threshold signal and the first time signal in a boost stage of the buck-boost converter; and generating a control signal of each power switch based on the inductive current sampling signal, the inductive current peak threshold signal and the second time signal. According to the scheme, the dynamic response speed and efficiency of the buck-boost converter can be improved, the buck-boost converter can be suitable for wider input and output voltage ranges, and automatic spectrum spreading can be achieved to enter the PFM mode.

The invention discloses a Buck converter control method based on output feedback anti-interference, and the method comprises the steps: setting an output voltage error, determining an error dynamic equation of a Buck converter system, and setting centralized disturbance designed based on a matched disturbance term and an unmatched disturbance term in the error dynamic equation; an extended state observer is designed based on the output voltage error and is used for acquiring an inductive current state estimation value, inputting the inductive current state estimation value into a state feedback controller, and forming a finite time output feedback anti-interference controller by taking concentrated disturbance as a feedforward compensation item; the output of the finite time output feedback anti-interference controller is compared with the PWM generator, and PWM waves are generated and act on the Buck converter system. According to the method, the Buck converter system can more quickly approach to a balance state, and the influence of external interference on stable operation of the system is effectively reduced.

The invention belongs to the related technical field of power electronic control, and discloses a Buck converter optimal phase shift angle prediction model training method, ripple optimization method and system, and the method comprises the steps: obtaining the training data of a converter under different working conditions, an input sample comprises the positive slope and negative slope of the output current of each phase of the converter, and the input sample comprises the positive slope and negative slope of the output current of each phase of the converter; the sample label is an optimal phase shift angle; and training an artificial neural network by using the training data set, so that the artificial neural network predicts the optimal phase shift angle of the converter based on the positive slope and the negative slope, and the trained artificial neural network is a prediction model of the optimal phase shift angle of the converter. Based on the trained neural network model, the optimal phase shift angle of the converter under different working conditions can be directly predicted, feedback adjustment is performed on a converter switching signal based on a prediction result, current ripples can be effectively suppressed, and the method for predicting the optimal phase shift angle by adopting the neural network model is not influenced by the state of the converter, so that the method is simple and convenient. The converter can be suitable for a converter in a symmetric or asymmetric state.

The application discloses a high-speed mode switching control system for a wide-input multi-mode ZVS-Buck converter, and belongs to the technical field of high-power-density power converters and power management, comprising a control circuit and a driving circuit, wherein the control circuit comprises a logic control circuit and a mode control circuit, wherein the logic control circuit comprises an inductor current sampling module, an output voltage sampling module, a compensation network module, two comparison modules, two timers, three dead-time modules and a flip-flop; the mode control circuit comprises two conduction time detection modules, a switching frequency detection module, two flip-flops and a logic AND gate. The application effectively adopts CrCM mode, DCM mode and COT mode, improves the efficiency under full load conditions, and significantly improves the dynamic response performance based on the mode switching method of conduction time or switching frequency detection. The application realizes fast mode switching when the load changes by detecting the conduction time or the switching frequency.

The application discloses a common-mode electromagnetic interference modeling method, equipment, medium and product for a gallium nitride synchronous step-down converter, relates to the technical field of electromagnetic compatibility and power electronic modeling, and comprises the following steps: determining a common-mode conduction path, and then determining an EMI noise source; constructing an equivalent circuit of the gallium nitride synchronous step-down converter based on the EMI noise source; constructing a voltage-dependent nonlinear equivalent capacitance model of a switching device in the gallium nitride synchronous step-down converter, and further constructing an analytical model of the gallium nitride synchronous step-down converter; determining simulation data of the analytical model; constructing a unified composite excitation source based on the simulation data by using the superposition principle; replacing the EMI noise source in the equivalent circuit with the unified composite excitation source to obtain a unified CM-EMI model, and then obtaining a final common-mode electromagnetic interference model. The application can improve the prediction accuracy of high-frequency resonance.

This invention discloses a DC / DC converter and control method suitable for offshore wind farms. The invention uses a boost converter to realize the boost voltage and power transmission of the full DC wind farm bus, and a buck converter to establish the AC side grid voltage during the wind farm startup phase, providing the startup power of the wind farm and realizing black start of the offshore wind farm. Furthermore, by controlling the MMC and diode uncontrolled rectifier, fault ride-through under short-circuit faults on both DC buses can be achieved, ensuring the reliable operation of the power transmission system.

This invention provides a fault diagnosis and automatic fault-tolerance system and method. The system includes: a main control module and N control modules; the control modules are used to detect whether a buck converter has a fault and the type of fault based on the switch status and voltage value; and when the buck converter is detected to be working normally, they send a first control signal to the main control module; the main control module is used to calculate the operating current command and interleaved conduction angle of each buck converter based on the number M of first control signals received; and send the operating current command and interleaved conduction angle to the control module that outputs the first control signal; the M control modules are also used to form a new daisy-chain communication structure based on the operating current command and interleaved conduction angle to drive the buck converter to work, which can quickly locate faults, isolate faults, automatically update the DC current and delay conduction angle increments, realize the safe, reliable and automatic interleaved operation of the hydrogen production power supply, and ensure that the output ripple of the hydrogen production power supply is always minimized.

The invention relates to the technical field of automatic control, and discloses a non-singular sliding mode control method and device for a Buck converter, and the method comprises the steps: building a disturbance-based average state equation according to the topological structure and external disturbance conditions of the Buck converter, and enabling the disturbance to comprise load resistance disturbance and input voltage disturbance; an error variable is determined according to the average state equation, a sliding mode controller is constructed according to the error variable, and the sliding mode controller is constructed based on the fractional order exponential reaching law; determining an extended state observer according to the average state equation; and estimating the state and disturbance of the Buck converter according to the extended state observer, and compensating the sliding mode controller according to the state and disturbance estimation condition of the Buck converter.

The application discloses a control system of a pulse sequence control triangular wave current mode soft switching Buck converter, the Buck converter comprises a direct current input power supply, a first switching tube, a second switching tube, an inductor, an output capacitor and a load, the positive pole of the direct current input power supply is connected with one end of the second switching tube and one end of the inductor through the first switching tube, the other end of the inductor is connected with one end of the output capacitor and one end of the load, the other end of the output capacitor, the other end of the load and the other end of the second switching tube are connected with the negative pole of the direct current input power supply, and the control system comprises a PT controller, a voltmeter for detecting and collecting a voltage signal between the load and a current meter for collecting an inductor current, wherein the input end of the PT controller is connected with the output end of the current meter and the output end of the voltmeter, the output end of the PT controller is connected with the control end of the first switching tube and the control end of the second switching tube, and the control system can control the size of negative current and has a relatively simple structure.

The invention discloses a controller of a power conversion circuit and a control method of an output stage of the power conversion circuit. The controller is coupled to the output stage and provides a pulse width modulation signal to control the output stage to generate an output voltage and an output current. The controller comprises a control circuit, a mode judging circuit and an adjusting circuit. The control circuit is coupled to the output stage and generates a pulse width modulation signal to the output stage. The mode determination circuit is coupled to the output stage. When the power conversion circuit enters the light load mode, the mode judgment circuit generates a starting signal according to the output current. The adjusting circuit is respectively coupled to the output stage, the mode judging circuit and the control circuit. When the enabling signal enables the adjusting circuit, the adjusting circuit generates a first adjusting signal to the control circuit according to a feedback voltage related to the output voltage and a first reference value so as to adjust the pulse width modulation signal. According to the controller of the power conversion circuit and the control method of the output stage of the controller, noise in an audio range during light-load application can be avoided, efficiency loss of a fixed-on-time (COT) buck converter caused by the audio noise is avoided, and overlarge ripple of output voltage is avoided.