4441 results about "Switching power" patented technology

The invention relates to the technical field of power electronics, in particular to a voltage ripple suppression and compensation method for a multi-output AC-DC switching power supply, and the method comprises the steps: obtaining the real-time voltage ripple signal of each AC-DC output channel and the working parameters of the switching power supply, and the working parameters comprise the switching frequency, the duty ratio, the inductance and capacitance parameters and the load current; inputting the real-time voltage ripple signal and the working parameters of the switching power supply into a preset coupling interference model, and generating ripple coupling characteristics between AC-DC output channels; determining a ripple suppression compensation coefficient through the ripple coupling characteristics; and based on the ripple suppression compensation coefficient and a preset PWM control signal, adjusting the output voltage of the switching power supply to suppress the ripple, thereby breaking through the limitation of a traditional method on independent processing of a single channel, and fundamentally solving the problem of a ripple suppression blind area caused by cross interference between channels.

The invention provides a double-pulse high-frequency switching power supply control method and system for precise electroplating, and relates to the field of electroplating, and the method comprises the steps: collecting area surface data through a three-dimensional scanner, and obtaining a three-dimensional model; extracting a high-curvature area grid according to the three-dimensional model, and calculating to obtain a surface concave-convex degree index; performing current field simulation, and calculating current density vector distribution; when the deviation of the current density vector distribution exceeds a preset deviation threshold value, pulse parameters are optimized through a genetic algorithm; selecting a pulse parameter which is most matched with the surface concave-convex degree index, and carrying out iterative calculation to obtain updated current density vector distribution; based on the difference between the updated current density vector distribution and the initial distribution, predicting a coating thickness value, and determining a preliminary evaluation index; and optimizing pulse parameters to obtain a final control scheme of uniform current distribution. According to the method, pulse parameters can be dynamically optimized according to the geometrical shape of the workpiece, and uniform current distribution and stable plating quality are realized.

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 control circuit for a switching power supply with adaptive voltage positioning control, can include: a compensation signal generation circuit configured to receive a digital voltage reference signal, a digital voltage sampling signal representing an output voltage of the switching power supply, and a digital droop voltage, and to integrate an error between the digital voltage reference signal and a sum of the digital voltage sampling signal and the digital droop voltage, in order to generate a compensation signal; and an adaptive voltage positioning control circuit configured to generate a positioning signal according to the compensation signal, in order to adjust the output voltage.

A variable slew rate gate drive system for powering an electric machine. The system may include a gate driver operable for controlling each of a plurality of hybrid switch power modules between opened and closed states to facilitate powering the electric machine. The gate driver may be operable for selecting slew rates and controlling ON and OFF states of first and second semiconductor switches included as part of each power module to optimize powering of the electric machine by varying the slew rates as a function of performance characteristics of the first and second semiconductor switches.

The embodiment of the invention discloses a voltage conversion circuit and a switching power supply. A control module magnetizes or demagnetizes an inductor by controlling alternate conduction of a main switching tube and a follow current switching tube in a voltage conversion module, and charges and discharges a first capacitor. A virtual inductive current ripple signal is constructed through a virtual ripple generation module, and the virtual inductive current ripple signal replaces ESR information on a first capacitor to be superposed on a feedback voltage, so that after the feedback voltage is superposed with the virtual inductive current ripple signal, the phase difference between the feedback voltage and an inductive current is reduced, and the feedback voltage is reduced. The control module outputs a first control signal according to a virtual inductive current ripple signal and a feedback voltage to control the conduction time of the main switching tube and the follow current switching tube, so that the problem of harmonic oscillation caused by a time-lag effect between an inductive current and the output voltage on the first capacitor is solved, and the generation of harmonic waves is suppressed; the stability of the output voltage of the voltage conversion circuit is improved.

The invention belongs to the field of electronic circuits, and provides a zero-cross detection circuit with an anti-crash function, a switching power supply and electronic equipment. The circuit comprises a current output module, a capacitor module, a switch module, a comparison module and a logic module, the capacitor module is connected with the current output module, the switch module and the comparison module, the current output module is connected with the switch module and a power module, and the logic module is connected with the switch module and the comparison module. And the current output module, the capacitor module and the switch module are also grounded. The logic module determines the working state of the circuit through the zero-crossing signal output by the comparison module, when the zero-crossing detection circuit enters a dead halt state, the reset signal is output according to the clock signal and the zero-crossing signal, and the switch module is controlled to be switched on periodically, so that the capacitor module is discharged periodically, the zero-crossing detection threshold value is reduced slowly, and the zero-crossing detection efficiency is improved. Finally, the zero-cross detection circuit can normally trigger zero-cross detection, and the reliability and efficiency of the switching power supply are improved.

A magnetic component and a switch power supply device are disclosed. The magnetic component includes a magnetic core and at least three windings, the magnetic core including at least three winding columns, at least one side columns, a first cover plate and a second cover plate opposite to each other, wherein the at least three winding columns are sequentially arranged in adjacent, the first cover plate and the second cover plate are respectively at upper parts or lower parts of the at least three winding columns and the at least one side column to form a closed magnetic flux loop; the at least three windings are wound on the at least three winding columns, respectively; wherein magnetic flux direction of the middle winding column in adjacent three winding columns is opposite to magnetic fluxes direction of the other two winding columns in adjacent three winding columns.

The invention relates to the technical field of digital control switching power supplies, and particularly discloses a switching power supply dynamic response adjusting system based on digital control, which comprises a digital controller, a multi-channel analog-to-digital conversion module, a parameter identification module, a self-adaptive control law adjusting module, a pulse width modulation driving module and a stability monitoring module. On-line identification of key parameters of a system is realized by constructing a nonlinear state space model and combining an extended Kalman filtering algorithm, dynamic compensation is carried out for non-minimum phase characteristics such as a right half plane zero point, and a self-adaptive control law adjustment module optimizes a control strategy in real time according to an updated model. A Lyapunov stability criterion and a predictive control mechanism are introduced, the robustness and response speed of the system are improved, and a stability monitoring module identifies an abnormal state through sliding window variance analysis and peak detection and triggers a fault-tolerant mechanism to guarantee safe operation of the system.

The invention discloses a buck-boost circuit-based mppt charging current backflow prevention control method, and relates to the technical field of switching power supplies, and the method comprises the steps: collecting a photovoltaic input voltage, a battery output voltage, and an inductive current flowing through an inductor; the current input power is calculated based on the photovoltaic input voltage and the inductive current, and the reference voltage is dynamically adjusted through an MPPT loop algorithm; pI voltage loop operation is carried out on the output voltage and the adjusted reference voltage, and expected charging current is generated; pI current loop operation is carried out on the expected charging current and the inductive current sampling value after proportionality coefficient adjustment, and a PWM duty ratio control signal is output to adjust the driving states of the four switching tubes; when the judgment circuit is in an intermittent conduction mode and meets critical conditions, a driving signal of the fourth switching tube is shielded, and only a body diode realizes a current path to prevent reverse flow of current; the battery current is effectively prevented from flowing backwards, and the system safety and the energy utilization efficiency are improved.

A resonant capacitor Crk (k is a natural number of one to n) of each circuit element has one end connected in series to a resonant reactor Lr and a primary winding N1 of a transformer T, and another end connected to the resonant capacitor Crk of another circuit element 10 so that a dimensional multiphase LLC converter having a phase difference of 360° / Pk is constructed by Pk (Pk is an optional natural number) of the circuit elements 10.

The invention relates to the technical field of lithium battery charging under photovoltaic panel power supply, in particular to a Buck-Boost lithium battery intelligent charging method based on ML-MPPT and dynamic reference voltage regulation, and the method comprises the steps: dividing a charging stage into a trickle charging stage, a constant-current charging stage and a constant-voltage charging stage according to the voltage of a lithium battery; the method comprises the following steps: acquiring environment temperature, solar illuminance and maximum power point voltage data in a constant current stage, preprocessing the data, training a maximum power point voltage prediction machine learning model, distilling the model to obtain a compression model, and deploying the compression model on a microcontroller; real-time environment data is input into the model to predict and obtain the maximum power point voltage as the reference voltage, the output voltage of the photovoltaic panel is sampled, and the input voltage of the Buck-Boost circuit is controlled by using the innovative PWM control system, that is, the duty ratio of PWM pulses is controlled through the microcontroller, the input impedance of the Buck-Boost circuit is adjusted, and the output voltage of the Buck-Boost circuit is adjusted. The output voltage of the photovoltaic panel, namely the input voltage of the switching power supply, is adjusted to the maximum power point voltage according to environmental conditions; and dynamically switching the lithium battery in different charging stages according to the battery state and the input power. The method integrates machine learning into prediction of the maximum power point voltage, and is suitable for an intelligent charging scene of the lithium battery under photovoltaic power supply.

The invention provides an active-disturbance-rejection control method for an electromagnetic bearing two-level digital switching power amplifier embedded with model information. The method comprises the steps that an electromagnetic bearing two-level digital switching power amplifier mathematical model suitable for controller design is established based on the Fourier series theory and coil current characteristics; a direct current component in the mathematical model is defined as a modeling disturbance term, and feedforward compensation is directly carried out in the control law; parameter perturbation and an unmodeled part in the mathematical model are defined as unknown perturbation items, and real-time estimation is carried out through an extended state observer; a current item and a control input item in the mathematical model are used as known model information to be embedded into the design of the extended state observer; designing a feedback control law to carry out real-time compensation on the current item, the modeling disturbance item and the unknown disturbance item; a zero-order retainer and a current observer are adopted to carry out discretization processing on the controller, and the discretization processing is realized on a digital control platform based on a DSP (Digital Signal Processor). The method is high in current response speed and high in control precision.

The invention provides a voltage stability control method for a multi-output switching power supply, which comprises the following steps of: sampling a main output channel in real time to obtain a voltage signal; the voltage signal is processed through a wide bandwidth error amplifier, a main channel adjusting signal is generated, and the main channel adjusting signal is used for driving a main power switch device; receiving an input voltage fluctuation frequency band of an auxiliary channel, a load current transient change gradient and a frequency spectrum coupling characteristic of a main channel adjusting signal through a dynamic prediction model, and generating an auxiliary channel adjusting signal with a phase lead compensation characteristic; a cross coupling active offset mechanism is constructed, time domain-frequency domain characteristics of coupling interference are extracted through a high-precision differential detection circuit, amplitude-frequency adjustable reverse correction signals are generated in real time through an adaptive compensation algorithm and injected into control nodes of an auxiliary output channel, and dynamic decoupling and ripple suppression are carried out. According to the method, high-stability control of multi-channel voltage under all working conditions is realized, and the dynamic response speed and the anti-interference capability are improved.

The invention provides a power consumption feature extraction method and system for a static random access memory standard cell library, electronic equipment and a storage medium, and the method comprises the steps: S1, reading a standard cell model file, a standard cell netlist and a standard cell time sequence path of a static random access memory, and constructing and generating an excitation waveform description file; s2, establishing a simulation file of the static random access memory standard unit, simulating the static random access memory standard unit, and respectively obtaining electrical characteristic data of an input pin and an output pin of the static random access memory standard unit; s3, analyzing the electrical characteristic data of the static random access memory standard unit, and obtaining a short-circuit power consumption time sequence path and a switching power consumption time sequence path existing in the static random access memory standard unit; and S4, respectively calculating power consumption values of each switching power consumption time sequence path and each short-circuit power consumption time sequence path. According to the method, the power consumption characteristics of the SRAM standard cell are extracted in the design stage of the standard cell library, and the precision and efficiency of power consumption analysis can be improved.

The invention discloses a bidirectional CLLC resonant converter with a wide input and output voltage range, and relates to the technical field of bidirectional DC / DC converters in the field of switching power supplies. According to the bidirectional CLLC resonant converter, bidirectional switching bridge arms are added to a primary circuit and a secondary circuit in a conversion main circuit respectively; the control circuit performs pulse frequency control on a switching tube in the LLC resonant network and also performs duty ratio control on the bidirectional switching bridge arm circuit, so that the gain range of the resonant converter can be further widened on the basis of performing pulse frequency control on the LLC resonant network, and meanwhile, the whole-process soft switching can be realized, and the reliability of the resonant converter is improved. And the efficiency of the converter is improved.

The invention discloses a junction temperature estimation method, electronic equipment and a storage medium, and relates to the technical field of electronic power, and the method comprises the steps: obtaining the rotating speed of a motor in an operation process; if the rotating speed is smaller than the preset speed threshold value, transient loss of each switching power module in the motor is determined, and the transient loss is jointly used as power loss of the motor in the operation process; if the rotating speed is greater than or equal to a preset speed threshold value, determining respective average loss of each switching power module, and taking each average loss as power loss of the motor in an operation process; and estimating the target junction temperature of the motor according to the power loss and a preset junction temperature conduction model. The technical problem of low junction temperature estimation accuracy is solved.

The invention provides a digital twin unmanned aerial vehicle circuit state monitoring method and system, and the method comprises the steps: firstly collecting a partial discharge pulse sequence of an unmanned aerial vehicle switching power supply circuit, separating environment electromagnetic noise through polarization filtering operation, and extracting real discharge pulses to generate partial discharge fingerprint data; inputting the fingerprint data into a pre-established fault search tree model, judging the type of a capacitor or inductor component through a first-stage branch node, and matching a degradation mode such as capacitance attenuation or magnetic saturation through a second-stage branch node to determine the fault type; then, corresponding component parameters of the equivalent circuit model are dynamically updated in the digital twin body, and the circuit operation state change trend is simulated; and finally, according to the state change trend, predicting the residual effective working time of the fault component and outputting a monitoring result. According to the invention, the accuracy of service life evaluation of key components in a complex electromagnetic environment is improved.

The invention discloses a soft start control method, a soft start control device and a switching power supply. The soft start control method comprises the following steps: starting at a first set frequency; comparing the output voltage Vout with the output judgment threshold Voth to judge the calculation mode of the switch preset frequency; if Vout is smaller than Voth, the switch preset frequency is calculated according to the output voltage; if Vout is greater than or equal to Voth, subtracting a fixed frequency quantity from the switching frequency of the previous judgment period as a switching preset frequency; judging whether current protection needs to be executed or not according to comparison between the resonant cavity current and a set resonant current protection threshold value; calculating the difference between the switch preset frequency and the switch frequency of the previous judgment period, comparing the difference with the maximum frequency step value and the minimum frequency step value respectively, updating the switch preset frequency, and ensuring that the switch preset frequency is adjusted within the range of the maximum frequency step value and the minimum frequency step value; and comparing the loop calculation frequency with the switch preset frequency, determining the final output switch frequency, and judging whether to end the soft start or not. The control is simple, and the monotonous rise of the output voltage within the full-load range can be realized.

The invention relates to the technical field of switching power supplies, in particular to a self-locking flyback switching power supply circuit with overcurrent and overvoltage protection, which comprises a primary side control circuit, a power conversion circuit, a synchronous rectification circuit and an output circuit, and is characterized in that a self-locking circuit is electrically connected with an overvoltage detection circuit and an overcurrent detection circuit; wherein the over-current detection circuit is used for detecting whether output current exceeds rated current or not; the overvoltage detection circuit is used for detecting whether the output voltage exceeds the rated voltage; and the self-locking circuit is used for pulling down the starting voltage of the primary side control circuit and the synchronous rectification circuit to a low level when the output overvoltage or overcurrent is detected, so that the power conversion circuit stops working until the input voltage is disconnected. According to the invention, the defects of response speed, protection precision, cost and adaptability in over-current and over-voltage protection of the existing flyback switching power supply are overcome.

The invention discloses a switching power supply performance test device, which comprises a test board, an inner cavity is arranged in the test board, a driving device is fixedly arranged in the inner cavity, the upper end of the driving device penetrates through the inner cavity and extends to the upper end of the test board, and the driving device is located at the upper end of the test board and is connected with an adjustable test mechanism. An electric telescopic rod is fixedly installed at the upper end of the test table, the output end of the electric telescopic rod is close to the test mechanism, the output end of the electric telescopic rod is fixedly connected with a placement table, and the placement table is connected with an adjustable clamping mechanism. The invention solves the problems that the combination of the switching power supply and a connecting probe needs to be manually pushed to test each switching power supply, the connection probe is fixed and is difficult to adjust in height, and a base plate needs to be arranged below different switching power supplies to meet the combination of the probe and a switching power supply port; the input voltage, the output voltage and the current of the tested product cannot be visually displayed, and the test efficiency is low.

The invention provides a switching power supply device comprising a transformer which comprises a primary winding and a secondary winding and is used for converting an input voltage into an output voltage; the primary switching tube is connected with the primary winding and controls the on-off of the primary winding; the rectifying unit is connected with the secondary winding and rectifies the output of the secondary winding, and the rectifying unit comprises a semiconductor field effect transistor; the control unit is connected with the rectification unit and generates a control signal so as to control the switch of the semiconductor field effect transistor through the control signal; the current detection unit detects the output current and generates a current detection signal; the control unit receives the current detection signal and adjusts the control signal according to the current detection signal. According to the device, the COOLMOS with small internal resistance and high switching speed is adopted, the switching loss is reduced, the switching signal is dynamically adjusted by the control unit according to the real-time output current, the rectification conduction loss and the switching noise are reduced, the power supply conversion efficiency is improved, and the electromagnetic interference is reduced.

The invention relates to the technical field of thermal management, in particular to an intelligent management and control system for a thermal infrared detection power supply. The method comprises the following steps: a thermal infrared detection unit monitors an infrared radiation signal and temperature change of a target area in real time based on a multimode sensor module, and corrects an output signal in consideration of a material aging problem; the multi-mode power supply unit dynamically switches power supply modes to optimize energy consumption; the intelligent management and control unit designs and adjusts an alarm threshold value, a sampling frequency and a communication strategy based on a self-adaptive algorithm; and the processing storage unit compresses, encrypts and stores the thermal infrared detection data based on the data processing module. Infrared radiation signals and temperature changes of a target area are monitored in real time through the multi-mode sensor module, output signals are corrected through a linear temperature compensation algorithm and aging correction, and the long-term stability and data accuracy of the system are improved. By dynamically switching the power supply mode, the optimal power supply is automatically selected according to the load requirement, and the power supply voltage is adjusted, so that the optimization of the energy consumption is realized.

The utility model relates to the technical field of magnet power supplies, and discloses an external superconducting magnet power supply, which comprises a plurality of power supply modules connected in parallel, the input end of each power supply module is electrically connected with a power grid, the output end of each power supply module is electrically connected with an external superconducting magnet, and the plurality of power supply modules connected in parallel are used for jointly supplying power to the external superconducting magnet; wherein the power supply module comprises a switching power supply sub-module which is electrically connected with a power grid and is used for converting alternating current of a first voltage level input by the power grid into high-frequency alternating current of a third voltage level; and the linear adjusting tube is electrically connected with the switching power supply sub-module and the outer superconducting magnet, and is used for converting the direct current of the third voltage level into direct current of a fourth voltage level and inputting the direct current of the fourth voltage level into the outer superconducting magnet. According to the utility model, through the switching power supply sub-module and the linear adjusting tube, the power factor and the energy utilization rate can be improved, the harmonic wave is small, the power grid is not polluted, and the stability of the output voltage is ensured.

The embodiment of the invention provides a radio frequency power supply and semiconductor process equipment, and the power supply comprises a power supply voltage control sub-module which is connected with a switching power supply module and is used for controlling the DC output voltage of the switching power supply module; the radio frequency control sub-module is connected with the radio frequency module and is used for controlling the power and the frequency of the radio frequency signal output by the radio frequency module; the power sampling sub-module is used for being connected with the radio frequency module and collecting a power feedback value of a radio frequency signal output by the radio frequency module; and the processor sub-module is connected with the power supply voltage control sub-module, the radio frequency control sub-module and the power sampling sub-module, and is used for outputting a control signal to the power supply voltage control sub-module and the radio frequency control sub-module based on the power feedback value and the frequency of the radio frequency signal, so that the radio frequency module outputs the required radio frequency signal. The embodiment of the invention can improve the output efficiency of the radio frequency module.

The present invention relates to a protection circuit for protecting a load, the protection circuit comprising: an input node adapted to be couplable to an SMPS, a bleeder coupled between the input node and a return node, a first output node adapted to be coupled to the input node and a load, a second output node adapted to be coupled to the load, the second output node being couplable between the first output node and the second output node, an impedance coupled between the second output node and the return node, a switch coupled in parallel with the impedance, and a controller adapted to control the switch and the bleeder, the controller adapted to activate the bleeder and open the switch when a voltage across the impedance is above a threshold, and the controller adapted to deactivate the bleeder and close the switch when a voltage across the impedance is below the threshold.

The invention provides an optimized winding method and system for a high-frequency transformer winding. A comprehensive parameter database based on current density distribution data of a high-frequency switching power supply is established, the axial temperature of a winding layer is collected in real time in combination with a self-calibration multi-axis winding device, and tension and interlayer gap compensation parameters are generated through temperature gradient feedback. The tension parameter drives the machine to adjust the winding tightness, and the gap parameter optimizes the heat dissipation channel. And synchronously fusing the current distortion data of the LLC resonant topology and an electromagnetic field simulation result, and generating a resonant frequency adjustment signal to suppress abnormal high-frequency current distribution. And dynamic matching of winding tightness, current distribution and heat dissipation requirements is realized through cooperative control. According to the system, electromagnetic, mechanical and thermal field multi-dimensional linkage is adopted, the skin effect and hot spot concentration are reduced, the temperature rise gradient is balanced, and the high-frequency working condition stability is enhanced. According to the technical scheme, through electromagnetic, mechanical and thermal field cooperative regulation and control, the temperature rise peak value of the high-frequency winding is greatly reduced, and the efficiency is greatly improved.

The invention discloses a multi-level pulse compensation type active EMI (Electro-Magnetic Interference) filter suitable for a multi-noise source switching power supply and a control method of the multi-level pulse compensation type active EMI filter. The invention provides a multi-level pulse compensation scheme based on switch behavior modeling, aiming at the problem of common-mode noise of adjacent rising edges and falling edges generated by a high-frequency switch in a multi-noise-source switching power supply. The time sequence delay and the edge slope of the compensation signal are calculated by analyzing the dv / dt characteristics in the switching-on and switching-off processes of the switching device, and accurate matching and offset with a noise source in phase and amplitude are achieved. Compensation control logic is realized by sharing a main control chip with a power circuit, and an additional controller and a high-precision sampling system are not needed; the self-adaptive tracking of the compensation amplitude is realized through the voltage following circuit; a multi-level compensation signal is output through the totem-pole circuit and injected into a common-mode path, and effective suppression of electromagnetic interference is achieved. The converter has the advantages of small size, low cost, simplicity and convenience in installation, high stability and the like, and is suitable for various multi-noise-source power electronic systems including a dual-active bridge converter, a phase-shifted full-bridge converter and an interleaving Buck converter.

The invention relates to the technical field of switching power supplies, and discloses a quasi-single-stage AC-DC converter based on a three-active-bridge structure. The three-active bridge structure comprises a first port, a second port and a third port; the first port is connected with an alternating current power supply and serves as an alternating current voltage input end of the AC-DC converter; the second port is connected with an external load and serves as a DC voltage output end of the AC-DC converter; the third port is reversely connected in series with the first port and is used for outputting a constant direct-current voltage with constant bias to the first port so as to convert an alternating-current voltage input into the first port into a sinusoidal voltage with bias, or outputting a sinusoidal voltage with variable bias to the first port so as to change the amplitude of the alternating-current voltage input into the first port so as to convert the alternating-current voltage into the sinusoidal voltage with bias; therefore, the number of times of electric energy conversion can be reduced, the overall working efficiency of the power supply is improved, the zero-crossing distortion of the input current at the network side is eliminated, and the power factor and the quality of the electric energy at the network side are improved.

The invention belongs to the technical field of transformers, and particularly relates to a transformer winding deformation accumulation evaluation system and method, and the system comprises a data collection module, a damage calculation module, a self-adaptive correction module and an early warning output module. Wherein the data acquisition module is used for acquiring an input signal of transformer winding deformation and preprocessing the input signal; the damage calculation module is used for performing real-time calculation on the input signal after the budgeting; the self-adaptive correction module is used for dynamically correcting the real-time calculation result of the input signal after the budgeting and calculating a damage value caused by short-circuit current impact in real time; and the early warning output module is used for carrying out early warning on the dynamically corrected deformation degree of the transformer winding and providing decision support. The accumulated deformation degree of the transformer winding can be accurately evaluated, maintenance can be carried out in time, transformer damage accidents are effectively avoided, and the method is suitable for health state on-line monitoring of power transformers, converter transformers and high-frequency switching power supply transformers.