10409results about "Efficient power electronics conversion" patented technology

The invention discloses a switching loss evaluation method and system based on a semi-soft switching modulation technology, and relates to the technical field of information. According to the method, parasitic inductance parameters and buffer capacitance parameters of a device are obtained, a resonant circuit working model is established, an initial voltage waveform and an initial current waveform are obtained by solving the model, and corresponding voltage stress and current stress are calculated; a parasitic inductance parameter and a buffer capacitance parameter of the device are optimized by using a genetic algorithm; adjusting the design of the buffer circuit according to the optimized device parameters, carrying out the simulation of the resonance process again, carrying out the frequency domain analysis of the optimized resonance voltage waveform and resonance current waveform, and optimizing the device parameters and the design of the buffer circuit. And finally, semi-soft switching modulation simulation is carried out, a temperature coefficient mapping relation between simulation switching loss and actually measured switching loss is constructed, an optimal design scheme of the device is determined, the switching loss of the device is effectively reduced, and it is ensured that the device works in a safe working area.

A method for actuating a DC-to-DC converter, in particular a clocked buck-boost converter that includes at least two switch elements and an inductor or throttle and via which an input voltage is converted into a regulated output voltage, wherein the switch elements are actuated with a variable switch frequency using pulse- and frequency-modulated control signals, where the pulse- and frequency-modulated control signals are derived from a manipulated variable from a regulator, a voltage curve on the switch elements is continuously ascertained or monitored to determine the activation time of the switch elements and to start a new switch cycle, the switch elements are activated if a specified minimum period duration has been exceeded upon detecting a voltage minimum of the ascertained voltage curve on the switch elements.

The invention relates to the technical field of power electronics, and discloses a soft switch of a high-frequency switch transformer and a distributed control method and system thereof, and the method comprises the steps: achieving the precise synchronization of nodes through the construction of a ring topology network, combining the monitoring of multiple physical quantities with the collaborative optimization of parameters, dynamically adjusting the parameters of a resonant network and a driving time sequence, and achieving the precise synchronization of the nodes. A zero-voltage switching state is maintained, and electromagnetic interference is suppressed by adopting the composite optimization model; the system comprises a network initialization module, a multi-physical-quantity monitoring module, a space-time synchronization control module, a resonance parameter adjustment module, an electromagnetic optimization decision module, a dynamic adjustment module and a parameter evolution module. The stability of the soft switch is improved through a distributed network and time-space synchronization, and the loss is reduced by adopting a dynamic optimization algorithm; constructing an electromagnetic interference optimization model to enhance compatibility; performing multi-parameter fusion and weight distribution to optimize dynamic response; the reliability is improved through a high-precision protocol and coevolution; and the tensor product framework realizes multi-dimensional intelligent cooperative control.

The invention relates to the technical field of gallium nitride gate drivers, and discloses a design method and system of a gallium nitride gate driver, and the method comprises the steps: carrying out the working signal collection of the gallium nitride gate driver, obtaining original waveform sampling data, and building a signal integrity model under the action of electromagnetic interference; separating the original waveform sampling data into an effective driving signal, a low-frequency interference signal and a high-frequency noise signal, and extracting characteristic parameters to obtain a signal characteristic parameter set; switching time and circuit power consumption are set as optimization variables, constraint conditions are set according to the signal integrity model, and an optimization objective function is obtained; performing online identification and optimization calculation on the driving parameters to obtain a driving control parameter sequence; according to the method, the adaptive capacity of the driver to the change of the working condition is improved, and meanwhile, the stability and the reliability of the driving waveform are ensured.

The present disclosure provides a multiphase switching converter and control circuit thereof. The multiphase switching converter includes a plurality of control circuits forming a daisy chain architecture, and to generate a preparatory output signal and a switching control signal for controlling a corresponding switching circuit when receiving a clock signal from a communication bus in the preparatory state, the control circuit is configured to operate in a preparatory state when receiving a preparatory input signal. Only preparatory signals are transmitted between the plurality of control circuits, and a signal for controlling circuit being on is participated by the clock signal generated by a host controller, so that the host controller does not need to track a position of a current unit in real time during a control process of all units, thus greatly simplifying a design of the host controller and reducing a circuit cost.

The invention provides a temperature compensation method and device for a silicon carbide MOS drive control chip, and the method comprises the steps: obtaining a junction temperature-electrical parameter set of a silicon carbide MOS, and carrying out the thermoelectric coupling simulation modeling processing of a junction temperature-electrical parameter mapping data set, and obtaining three-dimensional temperature-efficiency characteristic data; performing real-time parameter analysis and dynamic execution on the three-dimensional temperature-efficiency characteristic data to obtain an optimized switching characteristic waveform; extracting the optimized switching characteristic waveform frequency domain characteristics, and generating a dynamic frequency modulation parameter; and performing dead time iterative optimization on the dynamic frequency modulation parameters to obtain a control parameter combination of the silicon carbide MOS.

Power converters including electronic-embedded transformers for current sharing and load-independent voltage gain are described. An example power converter system includes an input, an output, a power converter between the input and output, and a controller. The converter includes a first bridge, a second bridge, and an electronic-embedded transformer between the first and second bridge. The electronic-embedded transformer includes a bidirectional coupling switch bridge. The controller generates drive control signals for quasi-trapezoidal current modulation control of the bidirectional coupling switch bridge. The controller is configured to generate the drive control signals based on a commutation coefficient k and a switching frequency for the power converter. The commutation coefficient k can be set based on an inductance in the electronic-embedded transformer, a capacitance in the bidirectional coupling switch bridge, and a margin for resonant current commutation.

The invention provides a single-stage AC / DC converter for realizing high-frequency isolation power factor correction, and relates to the technical field of converters. The AC-DC converter comprises an AC module with a transformer, an H4 full-bridge module, a third switch and a switch group satisfying a bidirectional current path. The alternating current module with the transformer comprises a first inductor, an intermediate capacitor, a second inductor and the transformer. The first end of the switch group satisfying the bidirectional current path is connected to the common end of the first inductor and the intermediate capacitor, and the second end is connected to the common end of the external AC power supply and the transformer. When the single-stage AC / DC converter works, the switch group satisfying the bidirectional current path is in complementary conduction with the third switch. Compared with equipment such as a two-stage energy conversion configuration, the AC / DC converter provided by the embodiment of the invention is equivalent to an isolated single-stage SEPIC-PFC converter for one-stage energy conversion, the circuit structure is simple, the control is easy to realize, a one-stage architecture is adopted, and the efficiency is improved.

The invention discloses a power supply starting control circuit, a power supply starting control method and electronic equipment. The power supply starting control circuit comprises a first electric energy conversion circuit, a resonance circuit, a second electric energy conversion circuit and a main control circuit, the main control circuit is configured to obtain a resonance current signal and a power supply output signal in a second start-up stage, so that the resonance current signal is generated when the power supply output signal is not greater than the target reference voltage. Performing slope compensation on an adjustment output signal obtained by using a difference value between the power supply output signal and the target reference voltage by using the first slope compensation slope to obtain a first feedback adjustment signal, and generating a second control signal by using the first feedback adjustment signal and the resonant current signal; the target reference voltage is linearly increased in the second starting stage; the first electric energy conversion circuit receives the first control signal and the second control signal and adjusts the converted and output first alternating current signal by using the first control signal and the second control signal in sequence. By means of the mode, the power supply starting control circuit can effectively achieve smooth starting control.

Power converters including electronic-embedded transformers for current sharing and load-independent voltage gain are described. An example power converter system includes an input, an output, a power converter between the input and output, and a controller. The converter includes a first bridge, a second bridge, and an electronic-embedded transformer (EET) between the first and second bridge. The EET includes a capacitor and a capacitance coupling switch bridge. The controller generates phasing drive control signals for trapezoidal current modulation control of the capacitance coupling switch bridge of the EET. The controller is configured to generate the phasing drive control signals based on a phase shift coefficient, k, to set a duty cycle of a voltage from the capacitance coupling switch bridge. The controller is also configured to vary k from between 0 to 0.5 based on a load applied to the power converter system or other operating aspects of the power converter.

In some embodiments, a system includes: a differential multilevel converter comprising a differential input to receive two different voltages; a plurality of switches coupled between the input terminals; and a capacitor having a first terminal coupled to a first terminal of a first one of the plurality of switches and a second terminal coupled to a first terminal of a second, different one of the plurality of switches; and an output terminal coupled to a first terminal of a third, different one of the plurality of switches. The differential multilevel converter can be part of a hybrid supply generator / modulator. The system can further include a controller configured to control selected ones of the plurality of switches to switch, at points in time, between a plurality of switch states with each switch state producing an output voltage corresponding to one of three discrete voltage levels.

A plurality of half-bridge LLC converters including a resonance circuit including resonant capacitors Cr1 to Crn are included as a circuit element 10, and a resonant capacitor Crk (k is a natural number of 1 to n) of each of the circuit element 10 has one end connected in series to a resonant reactor Lr and a primary winding N of a transformer T, and another end connected to the resonant capacitor Crk of another one of the circuit elements 10 so as to construct a k-dimensional multiphase LLC converter having a phase difference of 360° / Pk by Pk (Pk is any natural number of two or more) of the circuit elements 10, secondary windings S of a transformer of the circuit element 10 operating in the same phase are connected in series and the secondary windings are star-connected.

The invention discloses a SiC MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) driving circuit and a control method thereof, the SiC MOSFET driving circuit comprises an active current source driving circuit, a SiC MOSFET, a load current detection circuit, a drain-source inter-electrode voltage overshoot detection circuit, an analog-to-digital conversion module and an FPGA (Field Programmable Gate Array) module, and a self-adaptive adjustment algorithm is built in the FPGA module. The load current detection circuit and the drain-source inter-electrode voltage overshoot detection circuit have low requirements for real-time performance, use of high-speed simulation devices is avoided, hardware design cost is reduced, a self-adaptive adjustment algorithm can adjust SiC MOSFET gate drive parameters in real time according to output of the load current detection circuit and the drain-source inter-electrode voltage overshoot detection circuit, and the self-adaptive adjustment algorithm can adjust the gate drive parameters of the SiC MOSFET in real time according to the output of the drain-source inter-electrode voltage overshoot detection circuit. Therefore, overshoot and switching loss are self-adaptively balanced, and safe operation of the SiC MOSFET is ensured. The technical problems that a SiC MOSFET driving circuit driven by an active grid is high in hardware cost and is difficult to balance voltage and current overshoot and switching loss are solved.

The invention relates to a PFC-PWM (Pulse Width Modulation) dual-mode control method for a high-voltage direct-current power supply with a wide output voltage range. The output current of the high-voltage direct-current power supply is detected in real time, the critical threshold value of the load impedance is mapped into the hysteresis interval of the output current, the theoretical boundary of mode switching is obtained, and the control mode is dynamically adjusted. In order to further guarantee smooth switching of the two control modes, hysteresis control logic is designed, and undisturbed smooth switching of the PFM mode and the PWM mode is achieved. Based on an energy equivalence principle and a frequency consistency constraint of a critical load SWL working point, a current threshold criterion and a parameter pre-synchronization strategy are constructed, seamless connection of a mode switching process in a frequency domain and an energy domain is ensured, a transient oscillation risk is remarkably reduced, and a guarantee is provided for continuous and stable output of a full-range load working condition.

According to the control method of the Si IGBT and SiC MOSFET mixed frequency parallel system, when an open-circuit fault occurs in the SiC MOSFET high-frequency unit, the Si IGBT low-frequency unit works independently; under the light load working condition within the safe working range of the device, the SiC MOSFET high-frequency unit works independently; under the normal working condition, the Si IGBT low-frequency unit and the SiC MOSFET high-frequency unit share a common direct-current power supply and work in a coordinated mode, the Si IGBT low-frequency unit processes large power, the SiC MOSFET high-frequency unit compensates switch ripples generated by the Si IGBT low-frequency unit, specifically, the SiC MOSFET high-frequency unit adopts mQPR control and compensates third to twenty-third harmonic waves generated by an LFU, the Si IGBT low-frequency unit adopts SHEPWM control, the third to thirteenth harmonic waves generated by the Si IGBT low-frequency unit are reduced, and the switching ripple waves generated by the Si IGBT low-frequency unit are reduced. Therefore, the capacity requirement on the HFU is reduced.

The invention relates to the technical field of power converters, in particular to a power converter control method and device based on physical information machine learning and a storage medium. Comprising the following steps: setting up a control system; collecting, storing and preprocessing data; building and evaluating a model; model deployment; applying the model; and selecting a prediction model of the operation mode of the power converter. According to the design, physical constraint information is embedded into a loss function, a machine learning algorithm is used for mining the relation between the duty ratio, the frequency and the number of hopping pulses of a control signal and input voltage, input current, output voltage, output current and temperature, and a machine learning control model is deployed on an FPGA. The duty ratio, the frequency and the pulse hopping number of the control signal are predicted and controlled in real time; accurate modeling is performed through the nonlinear capability of a machine learning model, so that a large amount of cost can be saved, and the accuracy of the model is improved.

In a circuit element 10a, resonant circuits are arranged in parallel. A resonant capacitor Crkq of a q-th resonant circuit arranged in parallel has one end connected in series to a resonance reactor Lrq and a primary winding N1q of a transformer Trq. The resonant capacitor Crkq of the q-th resonance circuit arranged in parallel has another end connected to the resonant capacitor Crkq of a q-th one of the resonance circuit arranged in parallel in another one of the circuit elements 10a so that a k-dimensional multiphase LLC converter having a phase difference of 360° / Pk is constructed by Pk circuit elements.

A multi-phase LLC resonant converter circuit (10) includes: first to third LLC resonant converters each including a series circuit (S1 to S3) of a first switch and a second switch that are connected in parallel to a DC power supply, a high-frequency transformer (T1 to T3) including a primary-side winding and a secondary-side winding, a resonant circuit including a resonant reactor (Lr1 to Lr3) connected between a connection point of the first switch and the second switch and one end of the primary-side winding, a resonant capacitor (Cr1 to Cr3) in which one end is connected to the other end of the primary-side winding, and a divided resonant capacitor (Cn1 to Cn3) in which one end is connected to a connection point of the primary-side winding and the resonant capacitor; a first neutral line (N1) that connects the other end of the resonant capacitor; a neutral line reactor (Ln) connected between the first neutral line and a power supply line of the DC power supply; and a second neutral line (N2) that connects the other end of the divided resonant capacitor.

The present invention discloses a prediction method for a crosstalk spike in a half bridge of current-source inverter with silicon carbide devices, where, the prediction method includes calculation of the crosstalk voltage spike in the circuit of current-source type double-pulse test and analysis of the effect of each parameter on the magnitude of the crosstalk spike. The prediction method of the present invention analyzes the horizontal conduction crosstalk mechanism between the gate-source junction of the MOSFET caused by the high-frequency switching action of the silicon carbide (SiC) MOSFET and the SiC Schottky diode connected in series, and derives the prediction model for the crosstalk voltage spike in the half-bridge of current-source inverter. Based on the equivalent circuit of the current-source-type double-pulse test and the crosstalk-induced mechanism, the extreme value of crosstalk voltage spike is accurately predicted, which is helpful to analyze the effects of the drive circuit and the parameters of the power circuit on the crosstalk voltage spike through the prediction model.

Embodiments of the present application discloses a totem-pole power factor correction circuit and a power supply equipment. The circuit includes a sampling unit and a detection control unit. The sampling unit includes a first sampling resistor and a second sampling resistor, the first sampling resistor being electrically connected between a second connection point and an anode of a first diode, and the second sampling resistor being electrically connected between the second connection point and a cathode of a second diode. The detection control unit may output a control signal through a voltage at both terminals of the first sampling resistor or the second sampling resistor or a voltage at both terminals of the first sampling resistor and the second sampling resistor connected in series to drive the third switch or the fourth switch to turn off, thereby effectively avoiding components damage caused by a late turn off of the third switch or the fourth switch.

The present application relates to a flyback switch converter and a control circuit thereof; the control circuit comprises: a control signal generation module for providing a first control signal; a driver, for supplying a first switch transistor with a first driving signal according to the first control signal, so as to control the turning-on and off of the first switch transistor; the driver is further for performing overcurrent detection according to the voltage drop across the first switch transistor when the flyback switch converter performs the power output, and supplying a resonant capacitor with a discharge path when the flyback switch converter is shut down or enters the protection state. The present application can discharge residual charges on the resonant capacitor when the system is shut down or enters the protection state, and the system is less complex and with lower cost.

A zero-voltage switching ARCP-based converter that is capable of balancing its DC-link capacitor voltages and a method of balancing the voltages of the DC-link capacitors of an ARCP-based converter are disclosed herein. Each phase of the converter comprises a main section, an auxiliary section, and a control section. Main switches of the main section synthesize one or more reference voltage at the output of the phase. The auxiliary section facilitates zero voltage switching of the main switches. The control section provides gate signals for the main switches and the auxiliary switches based on the feedback signals from the converter to control the main and the auxiliary circuits. The method balances the voltages of the DC-link capacitor by utilizing ARCP-based hardware. The disclosed method minimizes switching losses and other EMI problems experienced by other converters.

The invention discloses a single-stage bidirectional power conversion topological structure capable of realizing wide-range soft switching and a control method of the single-stage bidirectional power conversion topological structure. In-bridge and inter-bridge phase shift control of a double-half-bridge circuit and a high-frequency switch matrix provides a basis for realizing soft switching of all power tubes; the switching frequency is adjusted in real time according to the magnitude of the port voltage, soft switching within a wide voltage change range is achieved, the current of a bridge arm connected with the primary side of the second transformer is the sum of the primary side current of the second transformer and the current of an inductor connected in parallel with the second transformer, and the inductance value of the inductor connected in parallel with the primary side of the second transformer is designed. The current of the bridge arm connected with the primary side of the second transformer can be effectively changed, so that the soft switching implementation range of the switching tube of the bridge arm connected with the primary side of the second transformer in a wide power transmission range can be expanded.

A resonant converter switching between different operational state modes is provided. The resonant converter includes a first transistor, a second transistor, a control circuit, a resonant circuit, a transformer and an output stage circuit. A first terminal of the first transistor and a second terminal of the second transistor are connected to positive and negative terminals of an input voltage source, respectively. A first terminal of the second transistor is connected to a second terminal of the first transistor. The resonant circuit is connected to the second terminal of the first transistor and the transformer. The transformer is connected to a load through the output stage circuit. The control circuit modulates frequencies or duty cycles of conduction time control signals that are outputted to the first and second transistors to different values for switching the resonant converter between the operational state modes.

The invention relates to the technical field of converter starting, in particular to an LLC full-bridge converter hybrid control soft start method, comprising the following steps: selecting a hybrid soft start strategy combining down-conversion starting and PWM starting, and respectively introducing nonlinear orders of a control switch frequency decline curve in the down-conversion starting process and a duty ratio rise curve in the PWM starting process; defining a mathematical formula of the change of the switching frequency and the duty ratio along with time when two nonlinear orders are different in value; establishing a simulation model, and substituting a mathematical formula that the switching frequency and the duty ratio change along with time when the two nonlinear orders are different in value into the simulation model; performing simulation testing on the nonlinear orders with different values, extracting the maximum resonance current, and determining an order combination with the best maximum resonance current suppression effect; and performing soft start of the LLC full-bridge converter based on the determined order combination. According to the invention, the current in the soft start process can be effectively suppressed, and meanwhile, quick start and device safety are considered.

The invention discloses an optimal control method for a single-phase high-frequency chain AC-DC non-electrolytic capacitor converter, and belongs to the technical field of power electronics. In order to realize power factor correction and soft switching without a closed-loop control circuit, the circuit comprises a converter and a controller, and the converter and the controller are connected through a signal; the controller collects a signal of the converter as a feedback signal, and generates a driving pulse signal of the converter in an SPWM mode. A phase shift control method and a dead zone self-adaptive control method are adopted to control a first series switch tube, a second series switch tube, a third series switch tube and a fourth series switch tube in a primary side matrix converter and a secondary side first switch tube and a secondary side second switch tube of a secondary side rectifier; and the frequency and the pulse width of the secondary-side third switch tube and the secondary-side fourth switch tube are optimally controlled. The driving pulse signal of the pre-stage matrix converter is generated, a direct-current link energy storage capacitor of a traditional two-stage rectifying circuit is eliminated, the size is reduced, and the hardware cost is saved.

An integrated circuit for a power supply circuit that generates an output voltage from an AC voltage. The power supply circuit includes a full-wave rectifier circuit rectifying the AC voltage, a filter receiving the rectified voltage, an inductor receiving a voltage from the filter, and a transistor controlling an inductor current flowing through the inductor. The integrated circuit is configured to switch the transistor, and comprises: a terminal configured to receive a first voltage corresponding to a sum of a first current, which flows from the filter to a ground, and the inductor current; and a switching control circuit configured to turn on the transistor in response to the inductor current becoming smaller than a predetermined value, and turn off the transistor such that a peak value of the sum and the rectified voltage have waveforms that are in phase, and are proportional in amplitude, to each other.

The invention belongs to the technical field of semiconductors, and particularly discloses a depletion type GaN device and a preparation method thereof.The depletion type GaN device comprises a source electrode, a drain electrode, a gate electrode, a plurality of gate structures, a field plate unit, a gate connecting assembly, a field plate connecting assembly, a gate driving resistor, a field plate driving resistor, a first dielectric layer and a second dielectric layer; the field plate unit comprises a plurality of field plates; one end of each of the plurality of gate structures is electrically connected with one end of the gate connecting assembly, and the other end of the gate connecting assembly is electrically connected with one end of the gate driving resistor; one end of each of a plurality of field plates of the field plate unit is connected with one end of the field plate connecting assembly, and the other end of the field plate connecting assembly is electrically connected with one end of the field plate driving resistor; the gate driving resistor and the field plate driving resistor are both connected in parallel with the gate electrode. According to the depletion type GaN device, the gate structure and the field plate unit are respectively provided with respective driving loops, so that voltage division adjustment is facilitated.

In a power conversion device, a control circuit sets an output voltage of a boost converter to a first output voltage level or a second output voltage level in accordance with a voltage corresponding to the input voltage, causes an electric current resonant converter to operate in a full-bridge mode as an operating mode when the first output voltage level has been set, and causes the electric current resonant converter to operate in a half-bridge mode as an operating mode when the second output voltage level has been set. The first output voltage level or the second output voltage level is set at a predetermined timing after the input voltage is input and a set operating mode is maintained until a process of setting the first output voltage level or the second output voltage level is reset.

The invention discloses a control method of a multi-module DAB converter. The control method comprises the following steps: S1, constructing a transmission power calculation model and a current stress calculation model of the DAB converter in an extended phase-shift control mode; s2, combining the two models through a Lagrangian function and then deriving, and determining a relational expression among a phase shift ratio, a voltage conversion ratio and transmission power of the DAB converter under the minimum current stress; s3, acquiring voltage and current information of the DAB converter, and calculating actual transmission power of each DAB module according to a direct power control method; and S4, solving the relational expression among the phase shift ratio, the voltage conversion ratio and the transmission power to obtain the optimal solution of the phase shift ratio of each DAB module, and sending the optimal solution of each phase shift ratio into an extended phase shift control circuit to realize control of each DAB module. While the power balance is realized, the inductive current stress is reduced, the system loss is reduced, and the overall operation efficiency is improved.