30 results about "Flyback transformer" patented technology

The invention discloses a design method of a PCB (Printed Circuit Board) integrated multi-winding planar transformer, which comprises the following steps of: forming a flat spiral or snake-shaped wire, a primary winding and a secondary winding on a multi-layer PCB through an etching process; the primary winding and the secondary winding are alternately arranged in different layers of the PCB, and an even-number-layer symmetrical laminated structure is adopted for layout; a flaky soft magnetic material with high magnetic conductivity is selected as a magnetic core, and the magnetic core is embedded into the slotting area of the PCB to be fixed; a grounding shielding layer is inserted between the adjacent winding layers; a heat conduction via hole array is arranged in a winding area of the PCB, heat generated by a winding layer is conducted to a large-area heat dissipation copper foil on the bottom layer of the PCB, and a vertical heat dissipation channel is formed. According to the planar flyback transformer, the windings are etched on the multi-layer PCB, the alternating symmetrical layout is adopted, the magnetic core is embedded, and the shielding layer and the heat conduction via hole array are arranged, so that the integrated design of the planar flyback transformer is realized.

The application relates to the technical field of power electronic converter control, and provides a three-port flyback DC-AC converter, characterized in that the three-port flyback DC-AC converter comprises a flyback circuit, a power frequency reverse bridge, an AC-DC converter and a CL filter which are sequentially connected in cascade; the AC-DC converter is an AC-DC three-winding flyback converter which can realize power factor correction function, and is realized through active device multiplexing and magnetic component multiplexing, and comprises a flyback transformer T 2, excitation inductance L f , output switch Q 3, Q 4; the modulation method is to calculate instantaneous output power P o , judge the operation mode of the system, and respectively perform active modulation, reactive modulation or mixed modulation, so that the power factor is adjusted through the modulation method.

The present application relates to a kind of double anti-star transformer rectification harmonic suppression control method.By establishing the rectification bridge arm phase characteristic parameter table in control platform, the theoretical conduction phase of bridge arm, winding attribution and waveform synchronization characteristic are recorded;In the operation process of rectification control unit, the output current of transformer and bridge arm conduction state are collected, and rectification operation state data set is generated;The conduction phase offset of bridge arm is calculated, the corresponding harmonic component is analyzed, and the mapping relationship between bridge arm state and harmonic distribution is obtained.According to the mapping result, it is judged whether the current bridge arm configuration meets the phase coverage requirement of target rectification pulse number, if not, select the standby bridge arm group with preset phase difference and generate switching instruction.Rectification control unit responds to instruction to lock current bridge arm conduction path and release target bridge arm group, realize bridge arm resource dynamic reconstruction and rectification performance optimization.The present application can effectively suppress harmonic, improve the topology adaptability and output quality of rectification system.

The utility model discloses a primary side feedback bidirectional flyback voltage conversion circuit based on an auxiliary coil commutation circuit. The primary side feedback bidirectional flyback voltage conversion circuit comprises a flyback transformer, an auxiliary coil commutation unit, a control unit and a main power loop. The auxiliary coil reversing unit is connected with the control unit; the control unit is connected with the main power loop, and the main power loop is connected with the flyback transformer; wherein the auxiliary coil commutation unit is used for enabling a coil of the flyback transformer to be subjected to commutation when the circuit is in a reverse DCDC conversion mode. By implementing the circuit provided by the utility model, a more efficient and safer battery equalization solution can be provided for the battery pack, the cost is lower and the stability is higher than that of the traditional secondary side feedback scheme, the key problems in the current equalization technology can be solved, and the circuit can be widely applied to a battery management system and has a wide application prospect. And the service life and efficiency of the whole battery pack are improved.

In an example embodiment, a method comprising identifying, by a primary-side controlled Universal Serial Bus Power Delivery (USB-PD) alternating current to direct current (AC-DC) converter, a first pulse, wherein the first pulse is received from a pulse transformer. The method further includes determining that a threshold duration of time is satisfied. In response to determining that the threshold duration of time is satisfied, the method includes identifying a second pulse, wherein the second pulse is received from the pulse transformer. The first pulse and the second pulse are used for control of a high-side field effect transistor (FET) and a low-side FET, where the high-side FET is coupled to an active clamp flyback (ACF) circuit and the low-side FET is coupled to a flyback transformer of the USB-PD AC-DC converter. In response to identifying the second pulse, the method further includes controlling operation of the high-side FET or the low-side FET.

This invention provides an auxiliary power supply control circuit, an auxiliary power supply, and a photovoltaic grid-connected inverter. The auxiliary power supply control circuit includes a power supply chip, a flyback transformer, an undervoltage shutdown circuit, and a switching circuit. The first secondary side of the flyback transformer supplies power to the power supply chip through its power supply port. The primary side of the flyback transformer responds to a control signal from the output port of the power supply chip, causing the auxiliary power supply to start according to a corresponding startup voltage. The undervoltage shutdown circuit is powered by the first secondary side of the flyback transformer. The undervoltage shutdown circuit instructs the power supply chip to shut down the auxiliary power supply when the startup voltage of the primary side of the flyback transformer is less than the voltage at the undervoltage protection shutdown point. The switching circuit controls the undervoltage shutdown circuit to start after a preset delay time when the auxiliary power supply starts. By adding the switching circuit, the startup of the undervoltage shutdown circuit is delayed when the auxiliary power supply starts, thereby preventing leakage current from the undervoltage shutdown circuit from affecting the auxiliary power supply's startup at the normal startup voltage.

The application discloses a method for winding of a flyback transformer with extremely low leakage inductance, wherein the primary winding is wired on the same layer and the same side, and the secondary winding is wired on the same side but different layers, so that the loop area of the wired end is greatly reduced, the coil loop is more complete, the coupling degree of the primary winding and the secondary winding is enhanced, the leakage inductance of the transformer can be reduced to an extremely low value, the primary winding and the secondary winding are wound on the magnetic core in an interlaced and stacked manner, the leakage inductance of the transformer is reduced, the magnetic loss is reduced, and meanwhile, the copper loss and the parasitic capacitance between turns are not increased.

This invention provides a switching control circuit that suppresses malfunctions of the protection mechanism regardless of the input voltage. [Solution] The switching control circuit (1, 1A, 1B) includes a first control circuit (3) configured to turn off the switching element (M1) when a current detection signal (Vcs) corresponding to the current (Ip) flowing through the switching element (M1) on the primary side of the flyback transformer (FT) reaches a first threshold (V1), and a second control circuit (4) configured to turn off the switching element (M1) after a fixed time (Tm) has elapsed since the switching element (M1) was turned on while the current detection signal (Vcs) had not reached a second threshold (V2) which is smaller than the first threshold (V1). The second control circuit (4) includes a fixed time setting circuit (42, 44, 45) configured to change the fixed time (Tm).

The rapid wiring terminal structure comprises a terminal strip and a rapid insertion terminal, the terminal strip comprises a shell, a plurality of fixed power connection columns are fixedly inserted in the shell, a plurality of through holes are formed in the shell, movable power connection pipes are movably arranged in the through holes in a sleeved mode, an installation plate is fixedly connected in the shell, and the installation plate is fixedly connected with the rapid insertion terminal. A plurality of sliding holes corresponding to the movable power connection pipes are formed in the mounting plate, the movable power connection pipes penetrate through the mounting plate through the sliding holes, the movable power connection pipes are fixedly sleeved with limiting ring plates, reset springs are fixedly connected between the limiting ring plates and the mounting plate, and the quick plug terminal comprises a shell clamped outside the shell. According to the utility model, the wiring terminal can be electrified only in a completely closed state, the use safety is improved, and the protective shell and the protective plugboard can prevent the binding post from being exposed outside, so that the use safety of the wiring terminal of the return-stroke transformer is further improved.

The embodiment of the utility model provides a double-transistor flyback power supply circuit. A driving transformer of the double-transistor flyback power supply circuit comprises a first primary side coil, a first secondary side coil and a second secondary side coil. The flyback transformer comprises a second primary side coil. The second electrode of the first switch tube is electrically coupled with the first end of the second primary side coil and the second end of the first secondary side coil, and the control electrode of the first switch tube is electrically coupled to the first end of the first secondary side coil. The first electrode of the second switch tube is electrically coupled with the second end of the second primary side coil, the second electrode of the second switch tube is electrically coupled with the second end of the second secondary side coil, and the control electrode of the second switch tube is electrically coupled to the first end of the second secondary side coil. The driving circuit is electrically coupled with the first primary side coil to transmit a pulse width modulation signal to the first primary side coil. The driving circuit is suitable for being electrically coupled with a direct current power supply end.

The invention relates to the field of new energy automobile motor controllers, in particular to a flyback transformer design method and system, electronic equipment and a readable medium. The method comprises the following steps: receiving input parameters required by the design of the flyback transformer; calculating the maximum primary inductance under the discontinuous conduction mode and the primary inductance under the minimum input voltage based on the input parameters; comparing the primary side inductance under the minimum input voltage with the maximum primary side inductance, and determining a working mode; if in the discontinuous conduction mode, calculating a peak current, a turn ratio and a minimum duty ratio in the discontinuous conduction mode; if in the continuous conduction mode, calculating a peak current, a turn ratio and a maximum duty ratio in the continuous conduction mode; the flyback transformer design parameters are generated based on the calculation result, through the design method, the key parameters of the transformer can be directly calculated only by inputting part of the parameters, the design process is greatly simplified, the design time is saved, and the rationality of the actual transformer design can be evaluated through the calculation function.

This application relates to the field of battery management technology and discloses a bidirectional active balancing control system and its control chip for a multi-cell series-connected battery pack. The system includes a primary-side energy storage terminal, a flyback transformer, a primary-side control chip, a secondary-side control chip, and an optocoupler communication module. The secondary-side control chip integrates N power channel switches and selects between cells to be discharged and cells to be charged via selection signals output from a cell voltage monitoring module. The energy from the cell to be discharged is transferred to the cell to be charged after passing through the flyback transformer and the primary-side energy storage terminal, achieving bidirectional energy transfer between any two cells. This system requires only two control chips to complete the active balancing of a multi-cell battery pack, exhibiting high integration and simplified peripheral circuitry.

A transformer circuit according to an embodiment of the present invention comprises: a power input unit; and a transformer for transforming a voltage input from the power input unit and including a primary-side transformer unit and a secondary-side transformer unit, wherein a moisture-proofing agent is applied to an EMI filter, a bridge diode, a flyback transformer, a flyback IC, and a photo coupler included in the primary-side transformer unit.

The invention belongs to the technical field of motor controllers, and provides a driving power supply for a power module of a motor controller, which comprises a driving power supply of a lower three-bridge driving circuit and is composed of a high-voltage Buck circuit and a push-pull circuit with negative voltage output; the output voltage of the high-voltage Buck circuit supplies power to the lower three-bridge drive circuit through the push-pull circuit with negative voltage output. In the embodiment of the invention, the driving power supply of the three-bridge driving circuit under the motor controller adopts the combination of the high-voltage Buck circuit and the push-pull circuit with negative-voltage output, so that the use of a high-withstand-voltage MOS (Metal Oxide Semiconductor) tube and a flyback transformer is avoided, the cost is reduced, the size of a PCB (Printed Circuit Board) is reduced, and the power density is improved.

The application discloses a double-tube flyback switching power supply, and relates to the technical field of switching power supplies, which comprises an input rectification filter circuit, a main control circuit, a switching tube circuit, a flyback transformer circuit and an output rectification filter circuit which are sequentially connected, and a feedback circuit is further connected between the flyback transformer circuit and the main control circuit; the switching tube circuit comprises a transistor Q1 and a transistor Q2; the transistor Q1 and the transistor Q2 constitute a double-tube flyback circuit, and both the transistor Q1 and the transistor Q2 are SiC MOSFETs; the output rectification filter circuit comprises a transistor Q3 and a synchronous rectification control chip U3; the transistor Q3 is a SiC MOSFET; and the synchronous rectification control chip U3 adopts a synchronous rectification circuit structure to rectify the power supply output by the flyback transformer. The application adopts the high-temperature-resistant SiC MOSFET switching device and the double-tube flyback structure, improves the power supply efficiency and reliability under the premise of taking into account the high-temperature-resistant performance.

The invention relates to the technical field of acoustic logging, and provides a high-voltage pulse excitation circuit suitable for underground long-distance acoustic detection and a control method. The high-voltage pulse excitation circuit comprises a direct-current power supply used for supplying power to a resonant charging module; the resonant charging module is connected with the direct-current power supply, the MCU and the energy storage capacitor bank and is used for boosting the voltage to a required voltage signal and charging the energy storage capacitor bank; the energy storage capacitor bank is connected with the H-bridge MOSFET array and is used for storing energy output by the resonant charging module and providing stable high-voltage pulses for the H-bridge MOSFET array; the H-bridge MOSFET array is connected with the flyback transformer, and the H-bridge MOSFET array is combined with the flyback transformer and used for generating bipolar high-voltage pulses and sending the bipolar high-voltage pulses to the ultrasonic transducer so as to drive the ultrasonic transducer to excite sound signals suitable for sound wave remote detection; and the MCU is used for dynamically adjusting the adaptive matching network and generating a PWM (Pulse Width Modulation) signal for controlling the resonant charging module.

A system includes a low-voltage battery operational to present a low-voltage electrical power, a rechargeable energy storage system operational to present a high-voltage electrical power, and a battery management unit electrically coupled to the low-voltage battery and the rechargeable energy storage system. The battery management unit includes a control circuit operational to consume the low-voltage electrical power, a flyback transformer operational to convert the high-voltage electrical power into the low-voltage electrical power, and the rechargeable energy storage system, a first path operational to transfer the low-voltage electrical power from the low-voltage battery to the control circuit, and a second path coupled to the first path and operational to transfer the low-voltage electrical power from the flyback transformer to the control circuit.

This utility model relates to the field of circuit control technology, specifically a quasi-resonant flyback AC-DC control circuit, including a flyback circuit. The flyback circuit includes a flyback transformer T, with a MOSFET Q1 electrically connected to the flyback transformer T. A capacitor C1 and a diode VD2 are connected in parallel on one side of the transformer T, and a load is electrically connected to the other side of the transformer T. A diode VD1 and an optocoupler are electrically connected between the transformer T and the load. A voltage regulator circuit, a filter circuit, a rectifier circuit, and a power transformer are electrically connected sequentially on the flyback circuit. During operation, when the main switch is turned off, the energy stored on the primary side of the power transformer is released to the load through the secondary side. Simultaneously, the primary inductance of T and the capacitor C1 form a resonant circuit, generating an oscillating voltage. When the oscillating voltage drops to its lowest point, the flyback circuit controls the main switch to turn on, thereby achieving near-zero voltage turn-on and reducing turn-on losses.

The application relates to a battery pack charging control method based on an improved Buck-Boost equalization circuit, a battery pack composed of four single batteries is used as a basic unit of inter-group equalization control, an intra-group equalization circuit is used for electric quantity equalization in the battery pack, and an inter-group equalization circuit and a flyback transformer are used between the battery pack and other arbitrary battery packs to realize equalization and charging between the two battery packs. The application realizes electric quantity equalization between arbitrary battery packs, increases the flexibility of electric quantity equalization of the battery pack, improves the battery equalization efficiency, avoids unnecessary intermediate batteries from participating in the electric quantity equalization process, reduces the switch tube loss and the electric energy loss, reduces the battery equalization time and the battery charging time, realizes concurrent control of inter-group equalization and battery pack charging, and improves the charging and equalization efficiency of the battery pack.

This invention provides an auxiliary power supply circuit, an auxiliary power supply, and a photovoltaic grid-connected inverter. The circuit includes a power chip, a flyback transformer, and an undervoltage shutdown circuit. The first secondary side of the flyback transformer supplies power to the power chip. The primary side of the flyback transformer responds to the control signal from the power chip, causing the auxiliary power supply to start according to the startup voltage. The undervoltage shutdown circuit is powered by the first secondary side. A voltage-stabilizing capacitor module and an output buffer resistor are provided between the first secondary side and the power supply port. The output power of the first secondary side increases as the resistance of the output buffer resistor decreases. The output buffer resistor is a positive temperature coefficient thermistor. By setting the output buffer resistor on the first secondary side as a thermistor, its resistance decreases as the temperature decreases, thereby increasing the output power on the first secondary side. This prevents the leakage current of the undervoltage shutdown circuit from affecting the power chip on the first secondary side, ensuring that the power chip can control the auxiliary power supply to start under normal startup voltage.

The invention discloses a dynamic correction method for a flyback transformer of a micro photovoltaic single-phase bidirectional grid-connected inverter and the inverter. The dynamic correction method comprises the following steps: respectively acquiring a set current of the flyback transformer and a sampling current of a primary side of the flyback transformer; calculating a current difference value based on the set current and the sampling current; if the current difference value is greater than a preset threshold value, performing reverse correction on an initial inductance value of the flyback transformer according to the sampling current and a historical correction value to obtain a corrected inductance value; constructing a turn-on time calculation model according to the set current, the corrected inductance value, the primary side voltage value and the transformer turn ratio, and calculating target turn-on time based on the turn-on time calculation model; and generating a correction signal according to the target turn-on time, and driving a switching device of the flyback transformer to act through the correction signal to control a working time sequence of the flyback transformer so as to realize dynamic correction of the flyback transformer. According to the invention, accurate calculation of the turn-on time can be ensured, stable soft switching performance is ensured, and soft switching failure is avoided.

A system includes a low-voltage battery operational to present a low-voltage electrical power, a rechargeable energy storage system operational to present a high-voltage electrical power, and a battery management unit electrically coupled to the low-voltage battery and the rechargeable energy storage system. The battery management unit includes a control circuit operational to consume the low-voltage electrical power, a flyback transformer operational to convert the high-voltage electrical power into the low-voltage electrical power, and the rechargeable energy storage system, a first path operational to transfer the low-voltage electrical power from the low-voltage battery to the control circuit, and a second path coupled to the first path and operational to transfer the low-voltage electrical power from the flyback transformer to the control circuit.

The invention discloses a high-voltage pulse charging and discharging circuit which comprises a charging loop and a discharging loop. The charging loop is connected in series with a first power supply S1, a diode D0, a capacitor C1, a suppression loop Y2 and a switch Q2, the anode of the diode D0 is connected with the anode of the first power supply, and the cathode of the diode D0 is connected with the first pole of the capacitor C1. The discharge loop is connected in series with the input terminal, the switch Q1, the suppression loop Y1, the capacitor C1 and the output terminal, and the positive electrode of the diode D0 is connected with the input terminal and the negative electrode is connected with the output terminal. The suppression loop Y1 and the suppression loop Y2 each comprise a flyback transformer T1 and a feedback circuit F, the primary side of the flyback transformer T1 is connected in series in the discharging loop and the charging loop, the secondary side of the flyback transformer T1 is connected with the feedback circuit F, and the output end of the feedback circuit F is connected with the two ends of the capacitor C1. The suppression loop Y1 / Y2 is used for suppressing parasitic oscillation, feeding back energy, reducing steepness of the upper edge and the lower edge of a pulse, reducing impact of a device, improving conversion efficiency and reducing the requirement for the performance of a high-voltage capacitor.

The invention relates to the technical field of LED dimming power supplies, in particular to a constant-voltage auxiliary power supply circuit for an LED dimming power supply, and is characterized in that the primary side of a main winding of a flyback transformer T1 is coupled to the output end of a flyback module, and the secondary side of the main winding of the flyback transformer T1 is coupled to the input end of an output dimming module; an auxiliary winding TC of the flyback transformer T1 outputs electric energy, and the electric energy is rectified and filtered by the rectifying and filtering module and then respectively provides power supply voltage for the dummy load module and the step-down constant-voltage module; the voltage-reducing constant-voltage module reduces power supply voltage, generates constant voltage and transmits the constant voltage to the voltage-stabilizing module; the voltage stabilizing module is used for receiving the constant voltage and then converting the constant voltage into a preset stable voltage value; the dummy load module is used for monitoring power supply voltage, and when the power supply voltage is lower than a minimum threshold value, the dummy load module is connected to the output end of the dimming module in parallel, and the main winding feedback of the flyback transformer T1 is improved; the problems of poor insulation and unstable power supply of the auxiliary power supply in the LED dimming power supply are solved.

The invention relates to a combinational circuit of multiple flyback switching power supplies. The combinational circuit is characterized in that the positive electrode of a power supply is connected with the first end of a first flyback transformer; the second end of the first flyback transformer is connected with the first end of the first flyback electronic switch and the positive electrode of the diode, the negative electrode of the diode is connected with the first end of the energy storage capacitor, and the second end of the first flyback electronic switch is connected with the second end of the energy storage capacitor and the negative electrode of the power supply. Leakage inductance energy generated by the first flyback transformer is stored in the energy storage capacitor; the negative electrode of the diode is also connected with the first end of the second flyback circuit, the second end of the second flyback circuit is connected with the second end of the energy storage capacitor, and the second flyback circuit is used for releasing the stored leakage inductance energy and supplying power to the second flyback circuit when the first flyback electronic switch is switched off; therefore, the energy storage capacitor is used as a power supply of the second flyback circuit, leakage inductance energy of the first flyback circuit is recovered and utilized, heat loss of the leakage inductance energy is avoided, and the efficiency of the power supply is improved.

The utility model discloses an anti-interference shielding case for a return transformer, which belongs to the field of anti-interference shielding cases and comprises a return transformer body, an anti-interference mechanism is arranged outside the return transformer body, and the anti-interference mechanism comprises an electromagnetic shielding case, a shielding base, a fixed rod, a compression spring, a movable plate and a limiting rod. The arranged anti-interference mechanism is used in cooperation with an upper return transformer body, and pins at the bottom of the return transformer body penetrate through pin holes in the top face of the shielding base and pin sleeves on the bottom face of the shielding base, so that the shielding base is installed on the top face of the return transformer body in advance; the pins on the return transformer body can be protected through the pin sleeves, so that the problem that the pins on the return transformer body are bent or damaged due to external factors when the return transformer body is used is solved; the purpose that the anti-interference shielding cover can be conveniently disassembled and assembled for use can be achieved, and the return transformer body can be conveniently disassembled and maintained.

The invention provides an energy storage battery active equalization circuit and a control method thereof, and relates to the technical field of battery management. The active equalization circuit of the energy storage battery comprises a switch module, a gating switch, a first bidirectional Buck-Boost bridge arm module, a second bidirectional Buck-Boost bridge arm module, a third bidirectional Buck-Boost bridge arm module, a fourth bidirectional Buck-Boost bridge arm module and a four-winding high-frequency transformer. The four-winding high-frequency transformer and the switching circuit can be combined to avoid the peak problem of a flyback transformer and the saturation problem of positive voltage transformation, energy loss in the balancing process is reduced, the balancing efficiency is improved, bidirectional flow of energy can be achieved, and the balancing time is shortened by combining a control strategy.

A drive circuit of a piezo actuator is provided with a flyback transformer whose primary winding is connected to a DC power supply, and whose secondary winding is connected to the piezo actuator, a charging switch that is connected to the primary winding, a discharging switch that is connected to the secondary winding, a regenerative capacitor that is connected to the primary winding and in which discharge energy from the piezo actuator is regenerated, and a switch control unit that controls ON / OFF operations of the charging switch and the discharging switch. The switch control unit controls the ON / OFF operations of the charging switch and the discharging switch so as to repeatedly charge and discharge the piezo actuator and thereby control the applied voltage of the piezo actuator.

The invention discloses a two-level bus voltage balancing device and a balancing method thereof, and relates to the technical field of circuit voltage balancing, and the method comprises a positive bus capacitor, a negative bus capacitor, a flyback transformer, a first switching device and a second switching device. The flyback transformer comprises a first winding and a second winding; the first winding is connected between the positive bus capacitor and the first switching device, and the second winding is connected between the negative bus capacitor and the second switching device; when the voltage of the positive bus capacitor is higher than a preset threshold value, the first switching device is triggered to be conducted to form an energy transfer loop; when the voltage of the negative bus capacitor is higher than a preset threshold value, the second switching device is triggered to be conducted to form an energy transfer loop; the first switching device and the second switching device are electrically connected with a controller, and the controller outputs PWM control signals according to real-time voltage values of the positive bus capacitor and the negative bus capacitor. The method has the effects of improving the energy utilization efficiency and reducing the cost.

The invention relates to the technical field of power electronics, in particular to a flyback high-voltage BUCK power circuit system which comprises a flyback transformer. The primary side of the flyback transformer comprises two primary windings and an auxiliary winding, and the secondary side of the flyback transformer comprises three secondary windings; the two primary windings are connected in series to form a series primary winding; a series primary winding of the flyback transformer is connected with the high-voltage power supply input circuit and the step-down and control circuit; an auxiliary winding of the flyback transformer is connected with an auxiliary input circuit; and three secondary windings of the flyback transformer are respectively connected with a U-phase voltage output circuit, a W-phase voltage output circuit and a V-phase voltage output circuit. According to the invention, the reliability and stability of the flyback high-voltage BUCK power supply circuit system in new energy motor control can be improved.