High-voltage power supply circuit filtering system and method of rehabilitation equipment

Abstract

The invention discloses a high-voltage power supply circuit filtering system and method of rehabilitation equipment, and belongs to the technical field of power supply filtering, the high-voltage power supply circuit filtering system comprises a first power supply isolation module, a second power supply isolation module, a first voltage transformation module, a power supply module and a second voltage transformation module, the first power supply isolation module isolates current and outputs first current and second current, the second power supply isolation module isolates and filters the first current and the second current and then outputs the first current and the second current, the first voltage transformation module transforms the first current and the second current and then outputs the first current and the second current to obtain and output sampling current, and the power supply module receives current of a main power supply, filters the current and then outputs the current. The second voltage transformation module alternately receives the first current and the second current, sine wave current is generated after voltage transformation, and the sine wave current is output after filtering. The power supply has the advantages that the input direct current can be converted into stable sine wave alternating current, and the stability of the power supply voltage is effectively improved after multiple times of filtering.

Description

Technical Field

[0001] The present invention relates to the field of power supply filtering, and in particular to a high-voltage power supply circuit filtering system and method for rehabilitation equipment. Background Art

[0002] Rehabilitation equipment refers to professional medical facilities used to help patients with physical therapy and occupational therapy to promote their rehabilitation. Rehabilitation equipment usually requires electricity and has a power regulation system. The power regulation system of rehabilitation equipment generally adjusts the voltage of the primary coil of the transformer in the transformer circuit to change the output voltage of the secondary coil, thereby achieving the purpose of adjusting the output power of the rehabilitation equipment.

[0003] Since rehabilitation equipment often needs to work directly on the patient's lesions, the stability of power output is very important. Moreover, since its power supply voltage is usually relatively large, its power supply part has a relatively complex filtering and voltage stabilization circuit.

[0004] The above-mentioned prior art solutions have the following defects: the current finally output by the existing power supply voltage filtering and stabilizing circuit is only filtered by various filtering circuits, and the stability cannot meet the requirements of medical rehabilitation equipment. Summary of the invention

[0005] In order to further increase the stability of the power supply voltage of the rehabilitation equipment, the present application provides a high-voltage power supply circuit filtering system and method for the rehabilitation equipment.

[0006] On the one hand, the high-voltage power supply circuit filter system of a rehabilitation device provided in the present application adopts the following technical solution: A high-voltage power supply circuit filter system for rehabilitation equipment includes a first power supply isolation module, a second power supply isolation module, a first voltage conversion module, a power supply module, and a second voltage conversion module; The first power isolation module is connected to a control power supply and a single-chip microcomputer, receives and isolates the current transmitted by the control power supply, receives a control signal transmitted by the single-chip microcomputer, controls the current output according to the control signal, and divides the isolated current into a first current and a second current and transmits them to the second power isolation module; The second power isolation module receives the first current and the second current transmitted by the first power isolation module, isolates and filters the first current and the second current, and then transmits them to the first transformation module; The first transformer module transforms the received first current and second current according to a preset, filters the transformed current, filters the high-wave voltage, alternately transmits the filtered first current and second current to the second transformer module, samples the first current and second current, and transmits the sampled current to the power supply module; The power supply module is connected to the main power supply, receives the current of the main power supply and obtains the power supply current after filtering, merges the received sampled current into the power supply current, and transmits the power supply current to the second transformer module; The second transformer module receives the first current and the second current alternately, and the first current and the second current are alternately combined with the power supply current for transformer transformation to obtain a sine wave current, and the second transformer module filters the sine wave current and outputs it.

[0007] By adopting the above scheme, after the user starts the rehabilitation equipment, the single-chip microcomputer starts, and the control power supply is divided into a first current and a second current after isolation. The first current and the second current are isolated again. The two isolations can avoid the influence of the control power supply voltage fluctuation on the subsequent circuit. The second power isolation module performs a filtering once, and then the voltage is transformed by the first transformer module. The current output by the total power supply is input into the second transformer module together with the first current and the second current after filtering. The first current and the second current received by the second transformer module are output alternately to form a sine wave current, and the sine wave current is output after filtering, which can effectively increase the stability of the power supply voltage.

[0008] Preferably, the first power isolation module includes a first isolated gate driver, one end of the first isolated gate driver is electrically connected to the control power supply and the single-chip microcomputer, and the other end is electrically connected to the second power isolation module, the first power isolation module filters the output current of the first isolated gate driver, and transmits the filtered current to the second power isolation module; The second power isolation module includes a second isolated gate driver and a third isolated gate driver, the second isolated gate driver receives the current transmitted by the first power isolation module, the third isolated gate driver receives the current transmitted by the first power isolation module, the second power isolation module filters the current output by the second isolated gate driver and the third isolated gate driver, and the second isolated gate driver and the third isolated gate driver are electrically connected to the first transformer module.

[0009] By adopting the above solution, the isolated gate driver can withstand the passage of high voltage and high current and effectively isolate the current. After the current is isolated and then filtered, the safety of the output current can be effectively guaranteed.

[0010] Preferably, the first transformer module includes a first transformer, the first transformer receives the current transmitted by the second isolated gate driver and the third isolated gate driver, the output end of the first transformer is connected to the first transmission circuit and the second transmission circuit, the first transmission circuit and the second transmission circuit both output current when the received current is a positive voltage, the first transformer module filters the first transmission circuit and the second transmission circuit to filter the high-wave voltage, and the first transmission circuit and the second transmission circuit are electrically connected to the second transformer module; The second transformer module includes a second transformer, the first transmission circuit and the second transmission circuit are electrically connected to the two ends of the second transformer input end respectively, the power supply module is electrically connected to the midpoint of the second transformer input end, the second transformer alternately receives the current output by the first transmission circuit and the second transmission circuit, so that the second transformer outputs a sine wave current, and the output end of the second transformer is electrically connected to an LC resonant circuit, and the LC resonant circuit filters the sine wave current output by the second transformer.

[0011] By adopting the above scheme, the first transformer performs the initial voltage transformation on the current, and then outputs the first current and the second current alternately to form a sine wave. The second transformer alternately receives the first current and the second current, and adds the received power supply current to finally form a stable sine wave current. After filtering by the LC resonant circuit, the stability of the output current and voltage can be effectively improved.

[0012] Preferably, the first power isolation module further comprises a resistor R1 electrically connected to the control power supply, the resistor R1 is electrically connected to the first isolated gate driver, the single chip microcomputer is electrically connected to the first isolated gate driver, and the first isolated gate driver comprises a first output terminal and a second output terminal; The second isolated gate driver of the second power isolation module is electrically connected to the first output end of the first isolated gate driver, the third isolated gate driver is electrically connected to the second output end of the first isolated gate driver, the output end of the second isolated gate driver is connected in parallel with a Schottky diode D1 and a Schottky diode D2, the Schottky diode D1 and the Schottky diode D2 are connected in parallel with each other, the anode of the Schottky diode D1 is electrically connected to the second isolated gate driver, the cathode of the Schottky diode D2 is electrically connected to the second isolated gate driver, the cathode of the Schottky diode D1 is electrically connected to a standard power supply, the anode of the Schottky diode D2 is grounded, and the Schottky diode D2 is electrically connected to the second isolated gate driver. The anode of the pole tube D1 and the cathode of the Schottky diode D2 are electrically connected to a capacitor C8, the other end of the capacitor C8 is connected to the first transformer module, the output end of the third isolated gate driver is connected in parallel with a Schottky diode D3 and a Schottky diode D4, the Schottky diode D3 and the Schottky diode D4 are connected in parallel with each other, the anode of the Schottky diode D3 is electrically connected to the third isolated gate driver, the cathode of the Schottky diode D4 is electrically connected to the third isolated gate driver, the cathode of the Schottky diode D3 is electrically connected to a standard power supply, the anode of the Schottky diode D4 is grounded, and the anode of the Schottky diode D3 and the cathode of the Schottky diode D4 are electrically connected to the first transformer module.

[0013] By adopting the above solution, Schottky diode D1 and Schottky diode D2 form a filter circuit to filter out the peak voltage of the output current of the second isolated gate driver, and Schottky diode D3 and Schottky diode D4 form a filter circuit to filter out the peak voltage of the output current of the third isolated gate driver.

[0014] Preferably, the two ends of the primary coil of the first transformer of the first transformer module are pins 5 and 6, the output end of the second isolated gate driver is electrically connected to pin 5 of the first transformer, the output end of the third isolated gate driver is electrically connected to pin 6 of the first transformer, the first transformer includes two secondary coils, one of the secondary coils of the first transformer has pins 1 and 2 at both ends, the other secondary coil of the first transformer has pins 3 and 4 at both ends, pin 1 of the first transformer is connected in series with a resistor R8, and pin 4 of the first transformer is electrically connected to the first transformer. A resistor R6 is connected, and pins 2 and 3 of the first transformer are electrically connected to a MOS tube Q1. The gate of the MOS tube Q1 is electrically connected to the end of the resistor R6 away from the first transformer. Pin 3 of the first transformer is electrically connected to the source of the MOS tube Q1. A resistor R7 is connected in parallel between the resistor R6 and the pin 3 of the first transformer. The end of the pin 3 of the first transformer close to the resistor R7 is grounded. The end of the resistor R8 away from the first transformer is electrically connected to the MOS tube Q2. The resistor R8 is electrically connected to the gate of the MOS tube Q2. The source of the MOS tube Q2 is grounded. A resistor R9 is connected in parallel between the gate and source of the MOS tube Q2; the drain of the MOS tube Q1 and the drain of the MOS tube Q2 are connected to the second transformer module, the drain of the MOS tube Q1 is connected in parallel with a diode D9 and a diode D10 connected in parallel with each other, the cathode of the diode D9 and the cathode of the diode D10 are connected in parallel to the drain of the MOS tube Q1, the anode of the diode D9 and the anode of the diode D10 are connected in parallel to the ground, the drain of the MOS tube Q1 is connected in parallel with a diode D11 and a diode D12, the MOS tube Q1 is connected in parallel with the anode of the diode D11 and the anode of the diode D12, The cathode of the diode D11 and the cathode of the diode D12 are connected in parallel and connected to the power supply module; the drain of the MOS tube Q2 is connected in parallel with the diode D5 and the diode D6 which are connected in parallel to each other, the cathode of the diode D5 and the cathode of the diode D6 are connected in parallel to the drain of the MOS tube Q2, the anode of the diode D5 and the anode of the diode D6 are connected in parallel to the ground, the drain of the MOS tube Q2 is connected in parallel with the diode D7 and the anode of the diode D8, the cathode of the diode D7 and the cathode of the diode D8 are connected in parallel and connected to the power supply module; The second transformer of the second transformer module includes two primary coils, one end of one primary coil of the second transformer is electrically connected to the drain of the mos tube Q2, and one end of the other primary coil of the second transformer is electrically connected to the drain of the mos tube Q1. The other ends of the two primary coils of the second transformer are connected in parallel to each other and connected to the power supply module. One end of the secondary coil of the second transformer is electrically connected to the inductor L2, and the other end of the inductor L2 is electrically connected to the capacitors C15, C16, C17 and C18 connected in parallel to each other. The other end of the secondary coil of the second transformer is connected in parallel with a resistor R17, and the other end of the resistor R17 is connected in series with a capacitor C19, and the other end of the capacitor C19 is grounded. The other end of the secondary coil of the second transformer and the other end of the capacitor C15 jointly output alternating current.

[0015] By adopting the above scheme, the output current of the first transformer is controlled by the MOS tube. When the pins 2 and 4 of the second transformer output forward current, the MOS tube Q1 outputs current. When the pins 1 and 3 of the second transformer output forward current, the MOS tube Q2 outputs current, ensuring that the current can be output alternately and stably. The diode filters the current. The inductor L2 and the capacitors C15, C16, C17 and C18 form an LC resonant circuit to filter the current output by the second transformer.

[0016] Preferably, the power supply module includes a capacitor C10 connected to the first transformer module, the other end of the capacitor C10 is connected to the second transformer module, the end of the capacitor C10 close to the first transformer module is electrically connected to the MOS tube Q3, the capacitor C10 is electrically connected to the drain of the MOS tube Q3, the gate of the MOS tube Q3 is electrically connected to the resistor R10, the other end of the resistor R10 is electrically connected to the diode D13, the resistor R10 is electrically connected to the anode of the diode D13, the cathode of the diode D13 is electrically connected to the drain of the MOS tube Q3, the source of the MOS tube Q3 is electrically connected to the inductor L1, the other end of the inductor L1 is electrically connected to the main power supply, a resistor R11 is connected in parallel between the gate and the source of the inductor MOS tube Q3, and a capacitor is connected in parallel at one end of the inductor away from the main power supply. C11, capacitor C12, capacitor C13 and capacitor C14, the other ends of capacitor C11, capacitor C12, capacitor C13 and capacitor C14 are connected in series with each other, the end of inductor L1 away from the main power supply is connected to the second transformer module, the other end of capacitor C13 is grounded, resistor R12, resistor R13, resistor R14, resistor R15 and resistor R16 are connected in parallel between the cathode of diode D13 and capacitor C10, the other ends of resistor R12, resistor R13, resistor R14, resistor R15 and resistor R16 are connected in series with each other and are electrically connected to the end of inductor L1 away from the main power supply, and polar capacitor C9 is connected in parallel at both ends of capacitor C10, the positive electrode of polar capacitor C9 is connected to the first transformer module, and the negative electrode of polar capacitor C9 is electrically connected to capacitor C12.

[0017] By adopting the above solution, the power supply module controls the current output through the MOS tube Q3. When the total power output current activates the gate of the MOS tube Q3, the power current is combined with the sampled current output by the first transformer module to output the current.

[0018] Preferably, it also includes a test module; the test module is connected to the first transformer module and the second transformer module, the test module presets an error limit, a test current value, a first estimated voltage value and a second estimated voltage value, the test module receives external input instructions, and transmits a test current to the first transformer module according to the instructions, detects the voltage value at the output end of the first transformer module and the voltage value at the output end of the second transformer module, calculates the difference between the voltage value at the output end of the first transformer module and the first estimated voltage value, and outputs a first alarm signal if the difference is greater than the error limit, calculates the difference between the voltage value at the output end of the second transformer module and the second estimated voltage value, and outputs a second alarm signal if the difference is greater than the error limit.

[0019] By adopting the above solution, the user can use the test module to test whether the power supply voltage is qualified before using the rehabilitation device. The test module can remind the user whether the first transformer module or the second transformer module of the rehabilitation device fails.

[0020] Preferably, it also includes a fault response module, which is connected to the test module. The fault response module is preset with a preset transformation ratio of the first transformer module and a preset transformation ratio of the second transformer module. After receiving the first alarm signal, the fault response module calculates the current transformation ratio of the first transformer module according to the voltage value at the output end of the first transformer module, generates a first compensation voltage according to the current transformation ratio of the first transformer module and the preset transformation ratio of the first transformer module, adds the first compensation voltage to the output end of the first transformer module, and controls the test module to detect again until the error disappears; after receiving the second alarm signal, the fault response module calculates the current transformation ratio of the second transformer module according to the voltage value at the output end of the second transformer module, generates a second compensation voltage according to the current transformation ratio of the second transformer module and the preset transformation ratio of the second transformer module, adds the second compensation voltage to the output end of the second transformer module, and controls the test module to detect again until the error disappears.

[0021] By adopting the above solution, after the test module detects a fault, the fault response module can urgently generate a compensation voltage based on the fault information, so that the rehabilitation equipment can continue to be used temporarily, avoiding delays in treatment due to the failure of the rehabilitation equipment.

[0022] On the other hand, the present application provides a high-voltage power supply circuit filtering method for rehabilitation equipment using the following technical solution: A high-voltage power supply circuit filtering method for rehabilitation equipment, comprising a filtering system as described above, comprising the following steps: S1, receiving external input commands and inputting the commands into the single-chip microcomputer, and the single-chip microcomputer outputs current; S2, isolating the current output by the single chip microcomputer through an isolated gate driver and then outputting a first current and a second current; S3, isolating the upstream AC power and the downstream AC power through two isolated gate drivers respectively and then outputting them, and filtering the output first current and the second current; S4, transforming the isolated first current and the second current through a first transformer, filtering the transformed first current and the second current, filtering the high-wave voltage, and outputting the first current and the second current alternately; S5, sampling the first current and the second current to obtain a sampled current, filtering the power current output by the total power supply, and combining the filtered power current and the sampled current to output the power current; S6. Alternately input the first current and the second current into two ends of the second transformer input end, input the power supply current into the middle of the second transformer input end, obtain a sine wave current through voltage transformation by the second transformer, and output the sine wave current after filtering.

[0023] By adopting the above scheme, after the user starts the rehabilitation equipment, the single-chip microcomputer starts and controls the power supply output. After two isolations, the initial transformation is performed. The two isolations can avoid the influence of the control power supply voltage fluctuation on the subsequent circuit. After the initial transformation, the current output by the total power supply is filtered and then transformed again together with the first current and the second current. After the second transformation, since the received first current and the second current are alternately output to form a sine wave current, the sine wave current is output after filtering, which can effectively increase the stability of the power supply voltage.

[0024] Preferably, the method further comprises the following steps: S7, stop controlling the power supply output, and input a test current to the input terminal of the first transformer; S8, detecting a voltage value at an output end of the first transformer and a voltage value at an output end of the second transformer, calculating a difference between a voltage value at an output end of the first transformer and a first estimated voltage value and a difference between a voltage value at an output end of the second transformer and a second estimated voltage value, and determining whether the two differences exceed an error limit; S9. If the difference between the voltage value at the output end of the first transformer and the first estimated voltage value exceeds the error limit, the current transformation ratio of the first transformer is calculated, and a first compensation voltage is generated according to the transformation ratio of the first transformer and the preset transformation ratio of the first transformation module, and the first compensation voltage is added to the output end of the first transformer; if the difference between the voltage value at the output end of the second transformer and the second estimated voltage value exceeds the error limit, the current transformation ratio of the second transformer is calculated, and a second compensation voltage is generated according to the transformation ratio of the second transformer and the preset transformation ratio of the second transformation module, and the second compensation voltage is added to the output end of the second transformer.

[0025] By adopting the above solution, the user can test whether the power supply voltage is qualified before using the rehabilitation equipment, and can remind the user whether the first transformer module or the second transformer module of the rehabilitation equipment is faulty. After detecting the fault, the compensation voltage can be urgently generated according to the fault information, so that the rehabilitation equipment can continue to be used temporarily, avoiding delays in treatment due to the failure of the rehabilitation equipment.

[0026] In summary, the present invention has the following beneficial effects: 1. After the user starts the rehabilitation equipment, the power output is controlled. After isolation, transformation and filtering, the sine wave current is output, which can effectively increase the stability of the power supply voltage.

[0027] 2. Before using the rehabilitation equipment, the user can test whether the power supply voltage is qualified. After detecting a fault, the compensation voltage can be urgently generated according to the fault information, so that the rehabilitation equipment can continue to be used temporarily, avoiding delays in treatment due to rehabilitation equipment failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall system block diagram of Example 1 of the present application.

[0029] Figure 2 This is a circuit diagram of the first power isolation module of Example 1 of the present application.

[0030] Figure 3 This is a circuit diagram of the second power isolation module of Example 1 of the present application.

[0031] Figure 4 This is a circuit diagram of the first transformer module in Example 1 of the present application.

[0032] Figure 5 It is a circuit diagram of a power supply module according to an embodiment of the present application.

[0033] Figure 6 This is a circuit diagram of the second transformer module in Example 1 of the present application.

[0034] Description of reference numerals: 1. First power isolation module; 11. Single chip microcomputer; 12. First isolated gate driver; 2. Second power isolation module; 21. Second isolated gate driver; 22. Third isolated gate driver; 3. First transformer module; 31. First transformer; 4. Power supply module; 5. Second transformer module; 51. Second transformer; 6. Test module; 7. Fault response module. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-6 This application is described in further detail.

[0036] Embodiment 1: This embodiment of the present application discloses a high-voltage power supply circuit filter system for a rehabilitation device, such as Figure 1 As shown, it includes a first power isolation module 1, a second power isolation module 2, a first transformer module 3, a power supply module 4, a second transformer module 5, a test module 6 and a fault response module 7.

[0037] like Figure 1 and Figure 2 As shown, the first power isolation module 1 includes a first isolated gate driver 12, pin 1 and pin 5 of the first isolated gate driver 12 are connected in series, pin 1 of the first isolated gate driver 12 is electrically connected to a resistor R1, and the other end of the resistor R1 is electrically connected to a control power supply VC1, a capacitor C1 is connected in parallel between the resistor R1 and the first isolated gate driver 12, the other end of the capacitor C1 is grounded, the end of the resistor R1 away from the control power supply VC1 is electrically connected to a single-chip computer 11, pin 2 of the first isolated gate driver 12 is electrically connected to a resistor R2, pin 3 of the first isolated gate driver 12 is grounded, pin 4 of the first isolated gate driver 12 is electrically connected to a resistor R3, and the other ends of the resistors R2 and R3 are electrically connected to the single-chip computer 11. Pin 6 of the first isolated gate driver 12 is electrically connected to a resistor R4, pin 7 of the first isolated gate driver 12 is electrically connected to a capacitor C2, capacitor C3 is connected in parallel at both ends of capacitor C2, one end of capacitor C3 close to the first isolated gate driver 12 is electrically connected to the control power supply VC1, and the other end of capacitor C3 is grounded. Pin 8 of the first isolated gate driver 12 is electrically connected to a resistor R5. The first power isolation module 1 filters the output current of the first isolated gate driver 12, and transmits the filtered current to the second power isolation module 2.

[0038] like Figure 2 and Figure 3As shown, the second power isolation module 2 includes a second isolated gate driver 21 and a third isolated gate driver 22, wherein the pin 2 of the second isolated gate driver 21 is electrically connected to one end of the resistor R4, and the pin 2 of the third isolated gate driver 22 is electrically connected to one end of the resistor R5. The pins 1 and 5 of the second isolated gate driver 21 are electrically connected to each other, the pin 5 of the second isolated gate driver 21 is electrically connected to a capacitor C4, the two ends of the capacitor C4 are connected in parallel with a capacitor C5, the capacitor C5 is electrically connected to a standard power supply VC2 near one end of the second isolated gate driver 21, and the other end of the capacitor C5 is grounded. The pins 4 and 8 of the second isolated gate driver 21 are grounded. Pin 6 and pin 7 of the second isolated gate driver 21 are electrically connected, and pin 6 of the second isolated gate driver 21 is connected in parallel with Schottky diode D1 and Schottky diode D2, and Schottky diode D1 and Schottky diode D2 are connected in parallel with each other, the anode of Schottky diode D1 is electrically connected to the second isolated gate driver 21, the cathode of Schottky diode D2 is electrically connected to the second isolated gate driver 21, the cathode of Schottky diode D1 is electrically connected to the standard power supply VC2, the anode of Schottky diode D2 is grounded, and the anode of Schottky diode D1 and the cathode of Schottky diode D2 are electrically connected to capacitor C8. Pin 1 and pin 5 of the third isolated gate driver 22 are electrically connected to each other, and pin 5 of the third isolated gate driver 22 is electrically connected to capacitor C6, and capacitor C7 is connected in parallel at both ends of capacitor C6, and one end of capacitor C7 close to the third isolated gate driver 22 is electrically connected to the standard power supply VC2, and the other end of capacitor C7 is grounded. Pins 4 and 8 of the third isolated gate driver 22 are grounded. Pin No. 6 and Pin No. 7 of the third isolated gate driver 22 are electrically connected, and Pin No. 6 of the second isolated gate driver 21 is connected in parallel with Schottky diode D3 and Schottky diode D4, Schottky diode D3 and Schottky diode D4 are connected in parallel with each other, the anode of Schottky diode D3 is electrically connected to the third isolated gate driver 22, the cathode of Schottky diode D4 is electrically connected to the third isolated gate driver 22, the cathode of Schottky diode D3 is electrically connected to the standard power supply VC2, and the anode of Schottky diode D4 is grounded. The second isolated gate driver 21 receives the current transmitted by the first power isolation module 1, the third isolated gate driver 22 receives the current transmitted by the first power isolation module 1, and the second power isolation module 2 filters the current output by the second isolated gate driver 21 and the third isolated gate driver 22.

[0039] like Figure 3 and Figure 4As shown, the first transformer module 3 includes a first transformer 31, a capacitor C8 is electrically connected to pin 5 of the first transformer 31, pin 6 of the third isolated gate driver 22 is electrically connected to pin 6 of the first transformer 31, pin 1 of the first transformer 31 is connected in series with a resistor R8, pin 4 of the first transformer 31 is electrically connected to a resistor R6, pins 2 and 3 of the first transformer 31 are electrically connected to a MOS tube Q1, the gate of the MOS tube Q1 is electrically connected to the end of the resistor R6 away from the first transformer 31, pin 3 of the first transformer 31 is electrically connected to the source of the MOS tube Q1, a resistor R7 is connected in parallel between the resistor R6 and pin 3 of the first transformer 31, and pin 3 of the first transformer 31 is grounded at one end close to the resistor R7. The end of the resistor R8 away from the first transformer 31 is electrically connected to the MOS transistor Q2, the resistor R8 is electrically connected to the gate of the MOS transistor Q2, the source of the MOS transistor Q2 is grounded, and the resistor R9 is connected in parallel between the gate and the source of the MOS transistor Q2; the drain of the MOS transistor Q1 and the drain of the MOS transistor Q2 are connected to the second transformer module 5, the drain of the MOS transistor Q1 is connected in parallel with a diode D9 and a diode D10 connected in parallel with each other, the cathode of the diode D9 and the cathode of the diode D10 are connected in parallel to the drain of the MOS transistor Q1, the anode of the diode D9 and the anode of the diode D10 are connected in parallel to the ground, the drain of the MOS transistor Q1 is connected in parallel with a diode D11 and a diode D12, the MOS transistor Q1 is connected in parallel with the anode of the diode D11 and the anode of the diode D12, and the cathode of the diode D11 and the cathode of the diode D12 are connected in parallel. The drain of MOS tube Q2 is connected in parallel with diode D5 and diode D6, the cathode of diode D5 and the cathode of diode D6 are connected in parallel to the drain of MOS tube Q2, the anode of diode D5 and the anode of diode D6 are connected in parallel to the ground, the drain of MOS tube Q2 is connected in parallel with diode D7 and diode D8, MOS tube Q2 is connected in parallel to the anode of diode D7 and the anode of diode D8, and the cathode of diode D7 and the cathode of diode D8 are connected in parallel. The first transformer 31 receives the current transmitted by the second isolated gate driver 21 and the third isolated gate driver 22, the output end of the first transformer 31 is connected to the first transmission circuit and the second transmission circuit, the first transmission circuit and the second transmission circuit both output current when the received current is a positive voltage, and the first transformer module 3 filters the first transmission circuit and the second transmission circuit to filter the high wave voltage.

[0040] like Figure 4 and Figure 5As shown, the power supply module 4 includes a capacitor C10, a cathode of a diode D7 and a cathode of a diode D7 are electrically connected to one end of the capacitor C10, and a cathode of a diode D11 and a cathode of a diode D12 are electrically connected between the capacitor C10 and the diodes D7 and D8. The capacitor C10 is electrically connected to a MOS transistor Q3 at one end near the diodes D7 and D8, the capacitor C10 is electrically connected to the drain of the MOS transistor Q3, the gate of the MOS transistor Q3 is electrically connected to a resistor R10, the other end of the resistor R10 is electrically connected to a diode D13, the resistor R10 is electrically connected to the anode of the diode D13, the cathode of the diode D13 is electrically connected to the drain of the MOS transistor Q3, the source of the MOS transistor Q3 is electrically connected to an inductor L1, the other end of the inductor L1 is electrically connected to the main power supply VCC, a resistor R11 is connected in parallel between the gate and the source of the inductor MOS transistor Q3, the end of the inductor away from the main power supply is connected in parallel with capacitors C11, C12, C13 and C14, and the capacitor C13 is connected in parallel with the inductor L1. 1. The other ends of capacitors C12, C13 and C14 are connected in series with each other, the end of inductor L1 away from the main power supply is connected to the second transformer module 5, the other end of capacitor C13 is grounded, resistors R12, R13, R14, R15 and R16 are connected in parallel between the cathode of diode D13 and capacitor C10, the other ends of resistors R12, R13, R14, R15 and R16 are connected in series with each other and electrically connected to the end of inductor L1 away from the main power supply, and polar capacitor C9 is connected in parallel at both ends of capacitor C10, the positive electrode of polar capacitor C9 is electrically connected to the end of capacitor C10 close to diode D7 and diode D8, and the negative electrode of polar capacitor C9 is electrically connected to capacitor C12. The power supply module 4 controls the current output through the MOS tube Q3. When the total power supply output current activates the gate of the MOS tube Q3, the power supply current is combined with the sampling current output by the first transformer module 3 to output the current.

[0041] like Figure 4 and Figure 6As shown, the second transformer module 5 includes a second transformer 51, and the No. 1 pin and the No. 2 pin of the second transformer 51 are electrically connected to the drain of the MOS tube Q2, the No. 6 pin, the No. 7 pin and the No. 8 pin of the second transformer 51 are electrically connected to the drain of the MOS tube Q1, and the No. 3 pin, the No. 4 pin and the No. 5 pin of the second transformer 51 are electrically connected to the end of the inductor L2 away from the total power supply VCC. The No. 10 pin of the second transformer 51 is electrically connected to the inductor L2, and the other end of the inductor L2 is electrically connected to the capacitors C15, C16, C17 and C18 connected in parallel with each other, the No. 9 pin of the second transformer 51 is connected in parallel with the resistor R17, and the other end of the resistor R17 is connected in series with the capacitor C19, and the other end of the capacitor C19 is grounded, and the other end of the secondary coil of the second transformer 51 and the other end of the capacitor C15 jointly output AC power. The output current of the first transformer 31 is controlled by the MOSFET. When the pin 512 and the pin 4 of the second transformer output forward current, the MOSFET Q1 outputs current. When the pin 511 and the pin 3 of the second transformer output forward current, the MOSFET Q2 outputs current to ensure that the current can be output alternately and stably. The diode filters the current. The inductor L2 and the capacitors C15, C16, C17 and C18 form an LC resonant circuit to filter the current output by the second transformer 51.

[0042] Replay Figure 1 , the test module 6 connects the first transformer module 3 and the second transformer module 5, the test module 6 presets the error limit, the test current value, the first estimated voltage value and the second estimated voltage value, the test module 6 receives the external input command, and transmits the test current to the first transformer module 3 according to the command, detects the voltage value at the output end of the first transformer module 3 and the voltage value at the output end of the second transformer module 5, calculates the difference between the voltage value at the output end of the first transformer module 3 and the first estimated voltage value, and outputs the first alarm signal if the difference is greater than the error limit, calculates the difference between the voltage value at the output end of the second transformer module 5 and the second estimated voltage value, and outputs the second alarm signal if the difference is greater than the error limit. Before using the rehabilitation equipment, the user can use the test module 6 to test whether the power supply voltage is qualified, and the test module 6 can remind the user whether the first transformer module 3 or the second transformer module 5 of the rehabilitation equipment is faulty.

[0043] Replay Figure 1, the fault response module 7 is connected to the test module 6. The fault response module 7 is preset with the preset transformation ratio of the first transformer module 3 and the preset transformation ratio of the second transformer module 5. After receiving the first alarm signal, the fault response module 7 calculates the current transformation ratio of the first transformer module 3 according to the voltage value at the output end of the first transformer module 3, generates the first compensation voltage according to the current transformation ratio of the first transformer module 3 and the preset transformation ratio of the first transformer module 3, adds the first compensation voltage to the output end of the first transformer module 3, and controls the test module 6 to detect again until the error disappears; after receiving the second alarm signal, the fault response module 7 calculates the current transformation ratio of the second transformer module 5 according to the voltage value at the output end of the second transformer module 5, generates the second compensation voltage according to the current transformation ratio of the second transformer module 5 and the preset transformation ratio of the second transformer module 5, adds the second compensation voltage to the output end of the second transformer module 5, and controls the test module 6 to detect again until the error disappears. After the test module 6 detects a fault, the fault response module 7 can generate a compensation voltage urgently according to the fault information, so that the rehabilitation equipment can continue to be used temporarily, avoiding delays in treatment due to rehabilitation equipment failure.

[0044] The implementation principle of the high-voltage power supply circuit filtering system and method of a rehabilitation device in an embodiment of the present application is as follows: after the user starts the rehabilitation device, the single-chip computer 11 starts, and the control power supply is divided into a first current and a second current after isolation. The first current and the second current are isolated again. The two isolations can avoid the influence of the control power supply voltage fluctuation on the subsequent circuit. The filtering is performed once in the second power supply isolation module 2, and then the voltage is transformed by the first transformer module 3. The current output by the total power supply is input into the second transformer module 5 together with the first current and the second current after filtering. The first current and the second current received by the second transformer module 5 are output alternately to form a sine wave current. The sine wave current is output after filtering, which can effectively increase the stability of the power supply voltage.

[0045] Embodiment 2: This embodiment of the present application discloses a high-voltage power supply circuit filtering method for rehabilitation equipment, including a filtering system as in Embodiment 1, and the specific steps are as follows: S1, receiving external input commands and inputting the commands into the single chip microcomputer 11, and the single chip microcomputer 11 outputs current. When the user starts the rehabilitation equipment, the single chip microcomputer 11 will receive the command, and the user can preset the single chip microcomputer 11 data in advance according to the needs, and the output voltage can be controlled.

[0046] S2, isolating the current output by the single chip microcomputer 11 through an isolated gate driver and then outputting a first current and a second current.

[0047] S3, isolating the upstream alternating current and the downstream alternating current through two isolated gate drivers respectively and then outputting them, and filtering the output first current and the second current.

[0048] S4, transforming the isolated first current and the second current through the first transformer 31, filtering the transformed first current and the second current, filtering the high-wave voltage, and outputting the first current and the second current alternately.

[0049] S5. Sample the first current and the second current to obtain a sampled current, filter the power current output by the total power supply, and combine the filtered power current and the sampled current to output the power current.

[0050] S6. Alternately input the first current and the second current into both ends of the input end of the second transformer 51, input the power current into the middle of the input end of the second transformer 51, obtain the sine wave current through voltage transformation by the second transformer 51, and output the sine wave current after filtering.

[0051] S7, after stopping the output of the control power supply, input a test current to the input end of the first transformer 31.

[0052] S8, detecting the voltage value at the output end of the first transformer 31 and the voltage value at the output end of the second transformer 51, calculating the difference between the voltage value at the output end of the first transformer 31 and the first estimated voltage value and the difference between the voltage value at the output end of the second transformer 51 and the second estimated voltage value, and determining whether the two differences exceed the error limit.

[0053] S9. If the difference between the voltage value at the output end of the first transformer 31 and the first estimated voltage value exceeds the error limit, the current transformation ratio of the first transformer 31 is calculated, and a first compensation voltage is generated according to the transformation ratio of the first transformer 31 and the preset transformation ratio of the first transformation module 3, and the first compensation voltage is added to the output end of the first transformer 31; if the difference between the voltage value at the output end of the second transformer 51 and the second estimated voltage value exceeds the error limit, the current transformation ratio of the second transformer 51 is calculated, and a second compensation voltage is generated according to the transformation ratio of the second transformer 51 and the preset transformation ratio of the second transformation module 5, and the second compensation voltage is added to the output end of the second transformer 51.

[0054] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high voltage power supply circuit filter system for rehabilitation equipment, characterized in that: It comprises a first power isolation module (1), a second power isolation module (2), a first voltage conversion module (3), a power supply module (4) and a second voltage conversion module (5); The first power isolation module (1) is connected to a control power supply and a single-chip computer (11), receives and isolates the current transmitted by the control power supply, receives a control signal transmitted by the single-chip computer (11), controls the current output according to the control signal, and divides the isolated current into a first current and a second current, and transmits the isolated current to the second power isolation module (2); The second power isolation module (2) receives the first current and the second current transmitted by the first power isolation module (1), isolates and filters the first current and the second current, and then transmits them to the first transformation module (3); The first transformer module (3) transforms the received first current and second current according to a preset, filters the transformed current, filters the high-wave voltage, alternately transmits the filtered first current and second current to the second transformer module (5), samples the first current and second current, and transmits the sampled current to the power supply module (4); The power supply module (4) is connected to a main power supply, receives the current of the main power supply and obtains the power supply current after filtering, merges the received sampled current into the power supply current, and transmits the power supply current to the second transformer module (5); The second transformer module (5) alternately receives the first current and the second current, and the first current and the second current are alternately combined with the power supply current for transformer transformation to obtain a sine wave current, and the second transformer module (5) filters the sine wave current and outputs it.

2. The high-voltage power supply circuit filter system of a rehabilitation device according to claim 1, characterized in that: The first power isolation module (1) comprises a first isolated gate driver (12), one end of the first isolated gate driver (12) is electrically connected to a control power supply and a single-chip computer (11), and the other end is electrically connected to a second power isolation module (2), the first power isolation module (1) filters an output current of the first isolated gate driver (12), and transmits the filtered current to the second power isolation module (2); The second power isolation module (2) comprises a second isolated gate driver (21) and a third isolated gate driver (22); the second isolated gate driver (21) receives the current transmitted by the first power isolation module (1); the third isolated gate driver (22) receives the current transmitted by the first power isolation module (1); the second power isolation module (2) filters the current output by the second isolated gate driver (21) and the third isolated gate driver (22); the second isolated gate driver (21) and the third isolated gate driver (22) are electrically connected to the first transformer module (3).

3. The high-voltage power supply circuit filter system of a rehabilitation device according to claim 2, characterized in that: The first transformer module (3) comprises a first transformer (31), the first transformer (31) receives current transmitted by the second isolated gate driver (21) and the third isolated gate driver (22), the output end of the first transformer (31) is connected to a first transmission circuit and a second transmission circuit, the first transmission circuit and the second transmission circuit both output current when the received current is a positive voltage, the first transformer module (3) filters the first transmission circuit and the second transmission circuit to filter high-wave voltage, and the first transmission circuit and the second transmission circuit are electrically connected to the second transformer module (5); The second transformer module (5) comprises a second transformer (51), the first transmission circuit and the second transmission circuit are electrically connected to two ends of the input end of the second transformer (51) respectively, the power supply module (4) is electrically connected to the midpoint of the input end of the second transformer (51), the second transformer (51) alternately receives the current output by the first transmission circuit and the second transmission circuit, so that the second transformer (51) outputs a sine wave current, and the output end of the second transformer (51) is electrically connected to an LC resonant circuit, and the LC resonant circuit filters the sine wave current output by the second transformer (51).

4. The high-voltage power supply circuit filter system of a rehabilitation device according to claim 2, characterized in that: The first power isolation module (1) further comprises a resistor R1 electrically connected to the control power supply, the resistor R1 is electrically connected to a first isolated gate driver (12), the single chip computer (11) is electrically connected to the first isolated gate driver (12), and the first isolated gate driver (12) comprises a first output terminal and a second output terminal; The second isolated gate driver (21) of the second power isolation module (2) is electrically connected to the first output end of the first isolated gate driver (12), the third isolated gate driver (22) is electrically connected to the second output end of the first isolated gate driver (12), the output end of the second isolated gate driver (21) is connected in parallel with a Schottky diode D1 and a Schottky diode D2, the Schottky diode D1 and the Schottky diode D2 are connected in parallel with each other, the anode of the Schottky diode D1 is electrically connected to the second isolated gate driver (21), the cathode of the Schottky diode D2 is electrically connected to the second isolated gate driver (21), the cathode of the Schottky diode D1 is electrically connected to a standard power supply, and the anode of the Schottky diode D2 is electrically connected to a standard power supply. The anode of the Schottky diode D1 and the cathode of the Schottky diode D2 are electrically connected to a capacitor C8, the other end of the capacitor C8 is connected to the first transformer module (3), the output end of the third isolated gate driver (22) is connected in parallel to a Schottky diode D3 and a Schottky diode D4, the Schottky diode D3 and the Schottky diode D4 are connected in parallel to each other, the anode of the Schottky diode D3 is electrically connected to the third isolated gate driver (22), the cathode of the Schottky diode D4 is electrically connected to the third isolated gate driver (22), the cathode of the Schottky diode D3 is electrically connected to a standard power supply, the anode of the Schottky diode D4 is grounded, and the anode of the Schottky diode D3 and the cathode of the Schottky diode D4 are electrically connected to the first transformer module (3).

5. The high-voltage power supply circuit filter system of a rehabilitation device according to claim 3, characterized in that: The primary coil of the first transformer (31) of the first transformer module (3) has two ends of pin 5 and pin 6, the output end of the second isolated gate driver (21) is electrically connected to pin 5 of the first transformer (31), and the output end of the third isolated gate driver (22) is electrically connected to pin 6 of the first transformer (31). The first transformer (31) includes two secondary coils, one of the secondary coils of the first transformer (31) has two ends of pin 1 and pin 2, the other secondary coil of the first transformer (31) has two ends of pin 3 and pin 4, and pin 1 of the first transformer (31) is connected in series. A resistor R8 is provided, a No. 4 pin of the first transformer (31) is electrically connected to a resistor R6, a No. 2 pin and a No. 3 pin of the first transformer (31) are electrically connected to a MOS tube Q1, a gate of the MOS tube Q1 is electrically connected to an end of the resistor R6 away from the first transformer (31), a No. 3 pin of the first transformer (31) is electrically connected to a source of the MOS tube Q1, a resistor R7 is connected in parallel between the resistor R6 and the No. 3 pin of the first transformer (31), and an end of the No. 3 pin of the first transformer (31) close to the resistor R7 is grounded; an end of the resistor R8 away from the first transformer (31) is electrically connected to a MOS tube Q2, and a resistor R8 The MOS transistor Q1 is electrically connected to the gate of the MOS transistor Q2, the source of the MOS transistor Q2 is grounded, and a resistor R9 is connected in parallel between the gate and the source of the MOS transistor Q2; the drain of the MOS transistor Q1 and the drain of the MOS transistor Q2 are connected to the second transformer module (5), the drain of the MOS transistor Q1 is connected in parallel with a diode D9 and a diode D10 connected in parallel with each other, the cathode of the diode D9 and the cathode of the diode D10 are connected in parallel with the drain of the MOS transistor Q1, the anode of the diode D9 and the anode of the diode D10 are connected in parallel to the ground, the drain of the MOS transistor Q1 is connected in parallel with a diode D11 and a diode D12, the MOS transistor Q1 is connected in parallel with the anode of the diode D11, and the The anode of the MOS tube Q2 is connected in parallel with the anode of the diode D11 and the cathode of the diode D12 and are connected to a power supply module (4); the drain of the MOS tube Q2 is connected in parallel with a diode D5 and a diode D6 which are connected in parallel with each other, the cathode of the diode D5 and the cathode of the diode D6 are connected in parallel with the drain of the MOS tube Q2, the anode of the diode D5 and the anode of the diode D6 are connected in parallel to the ground, the drain of the MOS tube Q2 is connected in parallel with a diode D7 and a diode D8, the MOS tube Q2 is connected in parallel with the anode of the diode D7 and the anode of the diode D8, the cathode of the diode D7 and the cathode of the diode D8 are connected in parallel and are connected to a power supply module (4); The second transformer (51) of the second transformer module (5) comprises two primary coils, one end of one primary coil of the second transformer (51) is electrically connected to the drain of the MOSFET Q2, the other primary coil of the second transformer (51) is electrically connected to the drain of the MOSFET Q1, the other ends of the two primary coils of the second transformer (51) are connected in parallel to each other and to the power supply module (4), one end of the secondary coil of the second transformer (51) is electrically connected to an inductor L2, the other end of the inductor L2 is electrically connected to capacitors C15, C16, C17 and C18 connected in parallel to each other, the other end of the secondary coil of the second transformer (51) is connected in parallel to a resistor R17, the other end of the resistor R17 is connected in series to a capacitor C19, the other end of the capacitor C19 is grounded, and the other end of the secondary coil of the second transformer (51) and the other end of the capacitor C15 jointly output alternating current.

6. The high-voltage power supply circuit filter system of a rehabilitation device according to claim 5, characterized in that: The power supply module (4) comprises a capacitor C10 connected to the first transformer module (3), the other end of the capacitor C10 is connected to the second transformer module (5), one end of the capacitor C10 close to the first transformer module (3) is electrically connected to a MOS tube Q3, the capacitor C10 is electrically connected to the drain of the MOS tube Q3, the gate of the MOS tube Q3 is electrically connected to a resistor R10, the other end of the resistor R10 is electrically connected to a diode D13, the resistor R10 is electrically connected to the anode of the diode D13, the cathode of the diode D13 is electrically connected to the drain of the MOS tube Q3, the source of the MOS tube Q3 is electrically connected to an inductor L1, the other end of the inductor L1 is electrically connected to a main power supply, a resistor R11 is connected in parallel between the gate and source of the inductor MOS tube Q3, and an inductor L2 is connected in parallel to the inductor L3 at one end of the inductor L4 away from the main power supply. Capacitor C11, capacitor C12, capacitor C13 and capacitor C14, the other ends of capacitor C11, capacitor C12, capacitor C13 and capacitor C14 are connected in series with each other, the end of inductor L1 away from the main power supply is connected to the second transformer module (5), the other end of capacitor C13 is grounded, resistor R12, resistor R13, resistor R14, resistor R15 and resistor R16 are connected in parallel between the cathode of diode D13 and capacitor C10, the other ends of resistor R12, resistor R13, resistor R14, resistor R15 and resistor R16 are connected in series with each other and are electrically connected to the end of inductor L1 away from the main power supply, and polar capacitor C9 is connected in parallel with both ends of capacitor C10, the positive electrode of polar capacitor C9 is connected to the first transformer module (3), and the negative electrode of polar capacitor C9 is electrically connected to capacitor C12.

7. The high-voltage power supply circuit filter system of a rehabilitation device according to claim 1, characterized in that: The invention also comprises a test module (6); the test module (6) is connected to the first transformer module (3) and the second transformer module (5); the test module (6) presets an error limit, a test current value, a first estimated voltage value and a second estimated voltage value; the test module (6) receives an instruction input from the outside, transmits a test current to the first transformer module (3) according to the instruction, detects a voltage value at the output end of the first transformer module (3) and a voltage value at the output end of the second transformer module (5), calculates a difference between the voltage value at the output end of the first transformer module (3) and the first estimated voltage value, and outputs a first alarm signal if the difference is greater than the error limit; calculates a difference between the voltage value at the output end of the second transformer module (5) and the second estimated voltage value, and outputs a second alarm signal if the difference is greater than the error limit.

8. The high-voltage power supply circuit filter system of a rehabilitation device according to claim 7, characterized in that: The invention also comprises a fault response module (7), the fault response module (7) being connected to the test module (6), the fault response module (7) being preset with a preset transformation ratio of the first transformer module (3) and a preset transformation ratio of the second transformer module (5), and the fault response module (7) calculating the current transformation ratio of the first transformer module (3) according to the voltage value at the output end of the first transformer module (3) after receiving the first alarm signal, generating a first compensation voltage according to the current transformation ratio of the first transformer module (3) and the preset transformation ratio of the first transformer module (3), and supplying a first compensation voltage to the first transformer module (3). A first compensation voltage is added to the output end of the module (3), and the test module (6) is controlled to detect again until the error disappears; after receiving the second alarm signal, the fault response module (7) calculates the current transformation ratio of the second transformation module (5) according to the voltage value at the output end of the second transformation module (5), generates a second compensation voltage according to the current transformation ratio of the second transformation module (5) and the preset transformation ratio of the second transformation module (5), adds the second compensation voltage to the output end of the second transformation module (5), and controls the test module (6) to detect again until the error disappears.

9. A high-voltage power supply circuit filtering method for rehabilitation equipment, comprising a filtering system as described in any one of claims 1 to 8, characterized in that: The following steps are involved: S1, receiving external input instructions and inputting the instructions into the single chip microcomputer (11), and the single chip microcomputer (11) outputs current; S2, isolating the current output by the single chip computer (11) through an isolated gate driver and then outputting a first current and a second current; S3, isolating the upstream AC power and the downstream AC power through two isolated gate drivers respectively and then outputting them, and filtering the output first current and the second current; S4, transforming the isolated first current and the second current through a first transformer (31), filtering the transformed first current and the second current, filtering the high-wave voltage, and outputting the first current and the second current alternately; S5, sampling the first current and the second current to obtain a sampled current, filtering the power current output by the total power supply, and combining the filtered power current and the sampled current to output the power current; S6. Alternately input the first current and the second current into two ends of the input end of the second transformer (51), input the power supply current into the middle of the input end of the second transformer (51), transform the current through the second transformer (51) to obtain a sine wave current, and filter the sine wave current before outputting it.

10. A high voltage power supply circuit filtering method for rehabilitation equipment according to claim 9, characterized in that: The following steps are also included: S7, stop controlling the power supply output, and input a test current to the input end of the first transformer (31); S8, detecting a voltage value at an output end of the first transformer (31) and a voltage value at an output end of the second transformer (51), calculating a difference between the voltage value at the output end of the first transformer (31) and a first estimated voltage value and a difference between the voltage value at the output end of the second transformer (51) and a second estimated voltage value, and determining whether the two differences exceed an error limit; S9, if the difference between the voltage value at the output end of the first transformer (31) and the first estimated voltage value exceeds the error limit, calculating the current transformation ratio of the first transformer (31), generating a first compensation voltage according to the transformation ratio of the first transformer (31) and the preset transformation ratio of the first transformation module (3), and adding the first compensation voltage to the output end of the first transformer (31); If the difference between the voltage value at the output end of the second transformer (51) and the second estimated voltage value exceeds the error limit, the current transformation ratio of the second transformer (51) is calculated, a second compensation voltage is generated according to the transformation ratio of the second transformer (51) and the preset transformation ratio of the second transformation module (5), and the second compensation voltage is added to the output end of the second transformer (51).

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