78 results about "Flyback transformer" patented technology

The invention belongs to the technical field of battery equalization, and particularly relates to a double-layer topological structure equalization circuit based on double multi-winding flyback transformers and a control method. The system is applied to a battery module, the battery module is formed by connecting at least two battery packs in series in a positive-negative mode, each battery pack is formed by connecting a plurality of single batteries in series in a positive-negative mode, and the equalization circuit comprises at least two bottom layer equalization circuits which correspond to the battery packs in a one-to-one mode and are used for achieving equalization of the single batteries in the corresponding battery packs through inductors. And the top-layer equalization circuit is connected with each bottom-layer equalization circuit and is used for realizing inter-group equalization of each battery pack through the battery module double-target equalization circuit based on the double multi-winding flyback transformers. According to the technical scheme, global energy distribution can be achieved through the double multi-winding flyback transformers in the top-layer equalization circuit, local energy transfer can be achieved through the inductors in the bottom-layer equalization circuits, the equalization path is remarkably shortened, and the equalization speed and efficiency are improved.

The invention discloses a battery module double-target equalization circuit and method based on double multi-winding flyback transformers, a battery module is formed by connecting n single batteries numbered according to a position sequence in a positive-negative connection and series mode, and the equalization circuit is provided with one multi-winding flyback transformer on each of the left side and the right side of the battery module. The right side multi-winding flyback transformer II is used for discharging equalization of a high-electric-quantity battery, the left side multi-winding flyback transformer is used for charging equalization of a low-electric-quantity battery, and primary windings of the flyback transformers on the two sides are connected with the whole battery module through MOS tubes and diodes. And the upper end and the lower end of each secondary winding are respectively connected with the corresponding battery through one MOS tube and one diode to form a loop. According to the equalization method, the difference values relative to the SOC mean value in the single batteries are compared in real time, and the high-electric-quantity or low-electric-quantity battery with the large difference value is selected for charging and discharging, so that the equalization speed is improved.

An electrical stimulation system includes an electrical stimulation circuit and a controller. The electrical stimulation circuit includes a flyback transformer connected to electrical stimulus outputs, and a switch having a control input. In some instances, a controller is connected to the control input, and generates a stimulus signal. The flyback transformer outputs an electrical stimulus event responsive to the stimulus signal onto the electrical stimulus outputs. In some instances, pulses operate to charge the flyback transformer to a saturation mode. In some further instances, a diode and capacitor arrangement electrically connected at a secondary side of the flyback transformer facilitate delivery of the electrical stimulus event at the electrical stimulus outputs.

A power supply applied to high-voltage input and low-ripple output of a high-voltage optical storage system comprises a filtering unit and a power taking photovoltaic high-voltage input bus; a voltage division circuit divides the output of the filter unit to charge an energy storage capacitor so as to supply power to the drive circuit unit; the flyback circuit unit comprises a flyback transformer, MOS (Metal Oxide Semiconductor) tubes and multiple flyback transformer windings, the driving circuit unit outputs synchronous PWM (Pulse Width Modulation) signals to control the MOS tubes, each primary winding is bridged with the RCD absorption circuit and then is connected to the D pole of the MOS tube, the S pole of the MOS tube is connected with the next adjacent primary winding, and the flyback circuit unit inputs a voltage division circuit which is formed by bridged multiple resistors in series. The resistance is divided into equal parts corresponding to the number of windings, the S pole of each MOS tube is connected to a contact between two adjacent equal parts of series resistors, and the two ends of each equal part of series resistor are connected with a filter capacitor in parallel; the secondary output of the transformer is divided into multiple paths, one path forms first direct current output through the linear adjusting circuit unit, and the other path forms second direct current output through the rectifying and filtering circuit unit.

The invention relates to automatic reverse current regulation in an active clamped flyback converter. According to one embodiment, a method is presented that includes sensing a reverse current through a main switch of an active clamped flyback (ACF) converter. The ACF converter includes a flyback transformer and an auxiliary switch. The method further includes determining whether a sensed voltage corresponding to the reverse current exceeds a threshold; reducing a duration of the reverse current by an incremental time interval, the duration of the reverse current including a first incremental time interval, the duration of the reverse current corresponding to a duration in which the auxiliary switch is activated; increasing the duration by a second incremental time interval greater than the first incremental time interval, the increasing in response to the reverse current not exceeding the threshold; and activating the auxiliary switch for the duration to achieve zero voltage switching (ZVS).

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 invention belongs to the technical field of battery equalization, and particularly relates to a series battery pack equalization system based on double-layer topology and a control method. The system is applied to at least two battery packs, each battery pack comprises a plurality of single batteries, and the system comprises at least two bottom layer equalization circuits which are respectively in one-to-one correspondence with the battery packs and are used for realizing equalization of the single batteries in the corresponding battery packs through inductors; and the top-layer equalization circuit is connected with each bottom-layer equalization circuit and is used for realizing inter-group equalization of each battery pack through a flyback transformer. The series battery pack equalization system provided by the invention has a flyback transformer-inductor double-layer battery equalization circuit structure, can directly realize energy transfer between and in each battery pack, shortens an equalization path, reduces resource loss caused by step-by-step energy transfer in an equalization process, and improves equalization efficiency; meanwhile, the size of the system is reduced, and the equalization cost is reduced.

The invention discloses an interlaced anti-laser photovoltaic inverter and a design method, and relates to the technical field of inverter design. In the first aspect, by tracking the maximum power point of the power supply, it is ensured that the power supply works in the optimal working state, the situation that the working performance of the interlaced anti-laser photovoltaic inverter is low due to the fact that the interlaced anti-laser photovoltaic inverter is affected by temperature and illumination intensity is avoided, and voltage and current are converted again through the inversion module; the solar energy conversion performance and the power grid output efficiency of the interlaced anti-laser photovoltaic inverter are improved, and the working performance of the interlaced anti-laser photovoltaic inverter is improved. And on the other hand, the optimal interlaced anti-laser photovoltaic inverter is determined through the optimal winding mode and the optimal air gap division number in combination with a preset air gap avoidance method. By designing the winding method of the flyback transformer, dividing the air gap and avoiding the air gap, the winding loss of the flyback transformer is reduced, and the working performance of the staggered anti-laser photovoltaic inverter is improved.

The application discloses a flyback transformer winding loss evaluation method, device, equipment and storage medium, and the method comprises the following steps: acquiring electrical data in a preset switching period, and actual primary side current waveform and actual secondary side current waveform of a to-be-tested flyback transformer under the electrical data, and constructing a current calculation model to obtain a primary side current change function and a secondary side current change function; then, the primary side current change function and the secondary side current change function are subjected to Fourier decomposition to obtain a primary side DC component, a primary side harmonic component, a secondary side DC component and a secondary side harmonic component; then, selected primary side harmonic components, selected primary side harmonic frequencies, selected secondary side harmonic components and selected secondary side harmonic frequencies are determined; subsequently, the primary side AC resistance, the primary side DC resistance, the secondary side AC resistance and the secondary side DC resistance of the flyback transformer are acquired; finally, the winding loss value of the to-be-tested flyback transformer is calculated. Through implementation of the application, the winding loss of the flyback transformer can be quantitatively calculated.

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 invention discloses a lithium battery double-layer equalization method based on an improved Buck-Boost circuit and a flyback transformer, double-layer topology is adopted, the improved Buck-Boost circuit is adopted in a bottom layer, energy transfer between any single bodies is realized through an inductor and an MOSFET switch array, and the method comprises three stages: high-energy single body discharging, inductor energy storage and low-energy single body charging, and a dead zone is set to prevent magnetic saturation; the top layer adopts a flyback multi-winding transformer, and inter-group energy transfer, including energy storage of a high-energy group and charging of a low-energy group, is realized through magnetic coupling of primary and secondary sides. A control strategy adopts an intra-group extreme value range method and an inter-group mean value difference method. The method improves the equalization speed, efficiency and reliability, supports simultaneous equalization of multiple cells / groups, can work independently in case of faults, and is suitable for large-scale battery packs.

To accurately control an output voltage of a piezoelectric actuator without switching the operation mode between charging and discharging of the piezoelectric actuator.SOLUTION: A drive circuit of a piezoelectric actuator includes: a flyback transformer in which a primary winding is connected to a DC power supply and a secondary winding is connected to the piezoelectric actuator; a charge switch connected to the primary winding; a discharge switch connected to the secondary winding; a regenerative capacitor connected to the primary winding, in which discharge energy of the piezoelectric actuator is regenerated; and a switch control unit that controls on / off operations of the charge switch and the discharge switch. The switch control unit controls an applied voltage of the piezoelectric actuator by controlling on / off operations of the charge switch and the discharge switch to repeatedly perform charging and discharging of the piezoelectric actuator.SELECTED DRAWING: Figure 2

The invention provides a variable-inductance flyback transformer structure, which comprises a flyback transformer main body, a magnetic core is arranged on the outer package of the middle part of the flyback transformer main body, a main winding is fixedly mounted on the inner wall of the middle part of the magnetic core, a secondary winding sleeves the outer wall of a side column on one side of the magnetic core, and a high-low air gap is formed in the outer wall of a side column on the other side of the magnetic core; the stepped air gap or the slope air gap is arranged, and when the magnetic core is close to saturation, the inductance value is reduced; according to the flyback transformer, the step air gap or the slope air gap is utilized, the saturation effect in the magnetic core is gradually promoted from the narrow side of the air gap to the wide side, under the condition of low-voltage input, the magnetomotive force is large, the saturation is promoted to the wide position greatly, and the inductance value of the flyback transformer is reduced; and under the condition of high-voltage input, the magnetomotive force excited by the flyback transformer is relatively small, and the narrower side of the air gap is saturated or unsaturated, so that the inductance of the flyback transformer is reduced or even not reduced, and the optimization design of the variable inductance of the flyback transformer structure is realized.

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 present invention discloses a double modular parallel flyback energy balancer for a series battery pack and a control method thereof, comprising i balancing modules, wherein the i balancing modules are formed by 5i MOSFET switches with anti-parallel diodes, i flyback transformers, and i battery cells connected in series, and the i balancing modules are used to form an inductance balancing module and a flyback transformer balancing module. The present invention uses an inductance balancing module to perform the first balancing in a static state, wherein the circuit structure of the inductance balancing module is simple and each module is independent of each other, and each inductance balancing module works simultaneously during balancing, and the balancing speed is fast, and the device is easy to control and implement; the second balancing is implemented by using a flyback transformer balancing module, wherein the topological circuit principle of the balancing is simple, the control capability of the balancing current is strong, the balancing energy transfer efficiency is high, and each flyback transformer balancing module is independent of each other, and each flyback transformer balancing module works simultaneously during balancing, and the balancing speed is fast.

The invention belongs to the technical field of high-voltage direct-current power supplies, and particularly relates to a high-voltage direct-current power supply device based on a positive polarity Marx circuit and a flyback transformer. The high-voltage direct-current power supply device comprises an input alternating-current power supply, an alternating-current rectification module, a positive polarity Marx circuit, a flyback transformer and a post-stage rectification circuit, after an alternating current power supply is converted into direct current through the rectifier module, the direct current serves as charging input of the positive polarity Marx circuit. Through parallel charging and series discharging modes of the positive polarity Marx circuit, energy is transmitted to the flyback transformer to realize a flyback operation mode, and finally stable high-voltage direct current is output through the rectification circuit. According to the invention, the problem of cooperative operation between the positive polarity Marx circuit and the flyback transformer is solved; the improved Marx circuit structure not only provides higher output voltage, but also remarkably improves the power transmission efficiency and the voltage gain of the system, and meets the high-voltage direct current application requirements.

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.

The invention relates to a power supply circuit and a DC-DC converter. The filtering module is used for filtering the high-frequency signal according to an input signal of a power supply bus of the power supply circuit to obtain a filtered signal; the modulation circuit is used for adjusting the voltage difference between the initial output voltage and the reference voltage of the power supply circuit according to the intermediate frequency signal representing the metadata and the high frequency signal representing the communication data segment to obtain a communication signal representing the communication data segment; the frequency of the intermediate-frequency signal is higher than that of the high-frequency signal; the flyback transformer module is used for adjusting the filtered signal according to the time when the communication signal is conducted, and transforming the adjusted filtered signal to obtain a target output voltage of the power supply circuit; the target output voltage is used for performing power supply and communication on the DC-DC converter; the initial output voltage is an output voltage generated prior to the target output voltage. According to the invention, the power transmission line can be reused, and communication can be ensured while normal power supply is realized.

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.

A power converter includes a capacitor, and first, second, and third legs coupled in parallel with the capacitor. The power converter further includes a flyback transformer having a first inductor and a second inductor, and a buck stage coupled in series between a first terminal of a power source and a first terminal of the first inductor. A second terminal of the first inductor is coupled between the first and second switching elements of the first leg. A first terminal of the second inductor is coupled between third and fourth switching elements of the second leg and to a second terminal of the power source. A second terminal of the second inductor is coupled between fifth and sixth switching elements of the third leg.

Communication of fault indications between a primary controller and a secondary controller in a secondary controlled flyback converter is described. In one embodiment, an apparatus includes a primary side field effect transistor (FET) coupled to a flyback transformer, the flyback transformer coupled to the primary side FET, and a primary side controller coupled to the flyback transformer. The primary side controller is configured to receive a signal from a secondary side controller across an electrical isolation barrier, apply a pulse signal to the primary side FET to turn on and turn off the primary side FET in response to the signal, communicate information across the flyback transformer to the secondary side controller by changing a first pulse width of the pulse signal to a second pulse width and applying the pulse signal having the second pulse width to the primary side FET.

The utility model discloses a driving device and electric driving equipment. The driving device comprises a flyback transformer circuit, a driving circuit and a feedback circuit. Wherein the input end of the flyback transformer circuit is connected with the power supply circuit, the output end of the flyback transformer circuit is connected with the input end of the feedback circuit, and the output end of the feedback circuit is connected with the control circuit; the flyback transformer circuit is configured to receive a control signal provided by the control circuit, perform voltage conversion on a first voltage provided by the power supply circuit according to the control signal, and generate a second voltage; the output end of the flyback transformer circuit is further connected with the input end of the driving circuit, the output end of the driving circuit is connected with a coil of the relay, and the driving circuit is configured to provide the second voltage for the coil so that a contact of the relay can be closed. Therefore, stable power supply voltage can be provided for the coil of the relay, and the safety and reliability of the circuit are improved.

The present invention discloses an active battery balancing circuit that utilizes the correlation of the voltage of each winding of a flyback transformer being clamped by a battery, including a control unit, a drive unit, and a charging battery pack; before the battery is balanced and charged, the total voltage is tested to calculate the average voltage of all battery packs; the voltage of each battery pack in the test circuit is tested, the voltage difference between the voltage of all battery packs and the average voltage is calculated, and the battery to be charged is selected according to the relationship between the voltage difference and a preset threshold. The circuit and method enable the battery to be balanced with a large current at any time, so that all single cells in the battery pack can be charged to their highest voltage at the same time, and discharged to their lowest voltage at the same time, fully improving the capacity and utilization of the battery pack, and maintaining the simplicity and high efficiency of the system. The simplicity of the single-ended flyback transformer and the correlation of the voltage of the same transformer winding are utilized to reduce the number of transformers and the sampling points. The balancing is fast.

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 invention provides a series battery pack, an electric quantity active equalization circuit, a control method and an expansion topology. The device mainly comprises 2-16 battery cells connected in series, each battery cell corresponds to one set of flyback transformers and one optocoupler relay, and all the flyback transformers multiplex a single high-frequency chopper tube; the input side of the flyback transformer is connected with a plurality of series cells, and the output side is connected with a single cell for voltage reduction and energy transmission; one side of the optocoupler relay is connected with the positive electrode of the series battery cell, and the other side of the optocoupler relay is connected with the corresponding flyback transformer and is used for gating charging of the single battery cell and controlling the equalization time of the battery cell; the high-frequency chopper tube is connected with the flyback transformers, receives PWM signals sent by an external microcontroller, adjusts voltage of the output sides of all the flyback transformers, and controls the battery cells to balance current. According to the invention, the battery pack formed by serially connecting the battery cells with poor consistency is effectively handled, the active equalization work of the battery cells in multiple modes is ensured, and the potential safety hazard caused by overcharge and overdischarge of a single battery cell is obviously reduced.

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 invention belongs to the technical field of high-voltage direct-current power supplies, and particularly relates to a high-voltage direct-current power supply device based on a negative single-bridge-arm Marx circuit and a flyback transformer. The high-voltage direct-current power supply device comprises an input alternating-current power supply, a rectification module, a negative polarity Marx circuit module, a flyback transformer and a post-stage rectification circuit. Alternating current is converted into direct current through the rectification module, and charging input is provided for the negative polarity Marx circuit; in the negative polarity Marx circuit, the energy is transmitted to the flyback transformer through an operation mode of parallel charging and series discharging, and finally stable high-voltage direct current is output through a post-stage rectification circuit. According to the invention, the key technical problem of cooperative operation of the Marx circuit and the flyback transformer is effectively solved; according to the optimized Marx circuit structure, the system output voltage and the voltage gain are remarkably improved, and the overall power transmission efficiency is improved.

The invention discloses a flyback transformer winding loss evaluation method, device and equipment and a storage medium, and the method comprises the steps: obtaining electrical data in a preset switching period, and the actual primary side current waveform and the actual secondary side current waveform of a to-be-tested flyback transformer under the electrical data, and constructing a current calculation model, obtaining a primary side current change function and a secondary side current change function; fourier decomposition is carried out on the primary side current change function and the secondary side current change function to obtain a primary side direct current component, a primary side harmonic component, a secondary side direct current component and a secondary side harmonic component; then determining a selected primary side harmonic component, a selected primary side harmonic frequency, a selected secondary side harmonic component and a selected secondary side harmonic frequency; the primary side alternating current resistance, the primary side direct current resistance, the secondary side alternating current resistance and the secondary side direct current resistance of the flyback transformer are obtained; and finally, calculating the winding loss value of the flyback transformer to be measured. By implementing the method, the winding loss of the flyback transformer can be quantitatively calculated.