A frequency converter power supply control circuit

Abstract

The utility model discloses a kind of frequency converter power supply control circuit, it is related to frequency converter technical field, including power module, access ac power and power processing, and by frequency conversion module to the power of power control module output is carried out frequency conversion processing, by power supply detection module detects power supply state and in power failure, timing control energy storage compensation module stores regenerative electric energy generated when frequency conversion module brake, and in need expansion pressure power supply, power module can control voltage superposition processing to the electric energy of energy storage compensation module and power control module output, by compensation switching module to the electric energy of energy storage compensation module release is carried out low voltage detection and in low pressure, control power control module carries out voltage regulation processing, to maintain expansion pressure power supply work.The utility model frequency converter power supply control circuit can improve the voltage range of frequency conversion power supply control circuit, and can carry out energy-saving power supply control.

Description

Technical Field

[0001] This utility model relates to the field of frequency converter technology, specifically a frequency converter power supply control circuit. Background Technology

[0002] When supplying power to an AC motor, a frequency converter composed of IGBTs or MOSFETs is generally used. By changing the frequency of the frequency converter's output power, the speed of the AC motor can be adjusted. When braking the AC motor, the regenerative energy generated is discharged, resulting in some energy waste. In addition, due to the influence of the voltage range of the power supply connected to the frequency converter, there may be situations where the frequency is increased but the output voltage of the frequency converter remains unchanged. Therefore, improvements are needed. Utility Model Content

[0003] This invention provides a power supply control circuit for a frequency converter to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A frequency converter power supply control circuit includes: a power supply module, a power supply control module, a power supply detection module, a frequency converter module, an energy storage compensation module, and a compensation switching module.

[0006] The power module is used to receive AC power, step down and rectify the AC power and output the first power, and output the first control signal when the voltage is amplified.

[0007] The power control module is connected to the power module and the compensation switching module. It is used to transmit AC power and receive the first power. When it receives the switching signal output by the compensation switching module, it performs voltage transformation on the AC power and outputs the second power. It also performs rectification and filtering on the AC power or the second power and outputs the third power.

[0008] The power supply detection module is connected to the power control module. It is used to store the third electrical energy and set the timer. When the third electrical energy is stopped, the stored energy signal is output at regular intervals.

[0009] The energy storage compensation module is connected to the power supply detection module, the frequency converter module and the power control module. When the energy storage signal is received, it stores the regenerated electrical energy generated by the frequency converter module. When the first control signal is received, it superimposes the released electrical energy with the third electrical energy and outputs the fourth electrical energy.

[0010] The frequency converter module, connected to the power control module, is used to perform frequency conversion processing on the third or fourth electrical energy and supply power to the connected AC motor. When the AC motor brakes, it generates regenerative electrical energy.

[0011] The compensation switching module, connected to the energy storage compensation module and the power supply module, is used to output a switching signal and control the energy storage compensation module to stop the energy superposition operation when the electrical energy released by the energy storage compensation module is lower than the set low voltage threshold and a first control signal is received.

[0012] As a further embodiment of this utility model: the power module includes a power port, a first resistor, a first capacitor, a first diode, a second resistor, a fourth resistor, a first push-button switch, and a ninth resistor;

[0013] Preferably, the first end of the power port is connected to one end of the first capacitor and the other end of the first capacitor and the anode of the first diode through the first resistor. The cathode of the first diode is connected to one end of the fourth resistor and the first end of the second resistor. The other end of the fourth resistor is connected to the moving end of the first push-button switch. The stationary end of the first push-button switch is connected to the first end of the ninth resistor and the compensation switching module.

[0014] As a further embodiment of this utility model: the power control module includes a first thyristor, a first switching transistor, a second thyristor, a first transformer, a third thyristor, a first rectifier, a third diode, a fourth diode, and a third capacitor; the frequency conversion module includes a first frequency converter and an output port;

[0015] Preferably, one end of the first thyristor is connected to one end of the second thyristor and the first end of the power port; the other end of the second thyristor is connected to the first end of the primary side of the first transformer; the second end of the primary side of the first transformer is connected to one end of the third thyristor and the second end of the power port; the other end of the first thyristor is connected to the first input terminal of the first rectifier and the first end of the secondary side of the first transformer; the other end of the third thyristor is connected to the second end of the secondary side of the first transformer and the second input terminal of the first rectifier; the first output terminal of the first rectifier is connected to the anode of the third diode; the cathode of the third diode is connected to the anode of the fourth diode and the first end of the third capacitor; the cathode of the fourth diode is connected to the first input terminal of the first frequency converter; the second input terminal of the first transformer is connected to the second end of the third capacitor and the second output terminal of the first rectifier; the first output terminal and the second output terminal of the first frequency converter are respectively connected to the first end and the second end of the output port; the control terminal of the first thyristor is connected to the control terminal of the third thyristor, the collector of the first switching transistor, and the second end of the second resistor; the emitter of the first switching transistor is grounded; and the base of the first switching transistor is connected to the control terminal of the second thyristor and the compensation switching module.

[0016] As a further embodiment of this utility model: the power supply detection module includes a fifth resistor, a sixth resistor, a first inverter, a second diode, a second capacitor, and a second logic device;

[0017] Preferably, one end of the fifth resistor is connected to the first output terminal of the first rectifier, the other end of the fifth resistor is connected to the anode of the second diode and the input terminal of the first inverter, and is connected to one end of the second capacitor and the second output terminal of the first rectifier through the sixth resistor, the cathode of the second diode is connected to the other end of the second capacitor and the B terminal of the second logic device, and the output terminal of the first inverter is connected to the A terminal of the second logic device.

[0018] As a further embodiment of this utility model: the energy storage compensation module includes a fourth capacitor, a fifth diode, a first power transistor, a second power transistor, and an energy storage device;

[0019] Preferably, one end of the fourth capacitor is connected to the first end of the third capacitor, the other end of the fourth capacitor is connected to the anode of the fifth diode and the source of the first power transistor, the drain of the first power transistor is connected to the first end of the energy storage device and the source of the second power transistor, the drain of the second power transistor is connected to the first input terminal of the first frequency converter, the second end of the energy storage device is connected to the second end of the third capacitor, the gate of the first power transistor is connected to the second end of the ninth resistor, the cathode of the fifth diode is connected to the cathode of the fourth diode, and the gate of the second power transistor is connected to the Y terminal of the second logic device.

[0020] As a further embodiment of this utility model: the compensation switching module includes a seventh resistor, an eighth resistor, a first comparator, a first reference power supply, a first logic device, and a second switching transistor;

[0021] Preferably, one end of the seventh resistor is connected to the first terminal of the energy storage device, and the other end of the seventh resistor is connected to the inverting terminal of the first comparator and connected to the second terminal of the energy storage device through the eighth resistor. The non-inverting terminal of the first comparator is connected to the first reference power supply. The output terminal of the first comparator is connected to the A terminal of the first logic device. The B terminal of the first logic device is connected to the stationary terminal of the first push-button switch. The Y terminal of the first logic device is connected to the control terminal of the second thyristor and the base of the second switching transistor. The emitter of the second switching transistor is grounded, and the collector of the second switching transistor is connected to the gate of the first power transistor.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows: The power supply control circuit of this utility model can be connected to AC power and processed by the power supply module, and the power output of the power control module is frequency-converted by the frequency conversion module. The power supply detection module detects the power supply status and, when the power is off, controls the energy storage compensation module to store the regenerative power generated when the frequency conversion module brakes. When voltage expansion power supply is required, the power supply module can control the energy output of the energy storage compensation module and the power control module to perform voltage superposition processing. The compensation switching module performs low-voltage detection on the power released by the energy storage compensation module and controls the power control module to perform voltage regulation processing when the voltage is low to maintain the voltage expansion power supply operation, improve the voltage range of the frequency conversion power supply control circuit, and perform energy-saving power supply control. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic block diagram of a frequency converter power supply control circuit provided for an embodiment of this utility model;

[0025] Figure 2 A circuit diagram of a frequency converter power supply control circuit provided for an example of this utility model;

[0026] Figure 3 The connection circuit diagram of the compensation switching module provided for this utility model embodiment. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In one embodiment, see Figure 1 A frequency converter power supply control circuit includes: a power supply module 1, a power supply control module 2, a power supply detection module 3, a frequency converter module 4, an energy storage compensation module 5, and a compensation switching module 6.

[0029] Power module 1 is used to connect to AC power, step down and rectify the AC power and output the first power, and output the first control signal when it is required to perform voltage amplification power supply.

[0030] The power control module 2 is connected to the power module 1 and the compensation switching module 6. It is used to transmit AC power and receive the first power. When it receives the switching signal output by the compensation switching module 6, it performs voltage transformation on the AC power and outputs the second power. It also performs rectification and filtering on the AC power or the second power and outputs the third power.

[0031] The power supply detection module 3 is connected to the power control module 2. It is used to store the third electrical energy and set the timer. When it stops receiving the third electrical energy, it outputs the energy storage signal at regular intervals.

[0032] The energy storage compensation module 5 is connected to the power supply detection module 3, the frequency converter module 4 and the power control module 2. When the energy storage signal is received, it stores the regenerated electrical energy generated by the frequency converter module 4. When the first control signal is received, it superimposes the released electrical energy with the third electrical energy and outputs the fourth electrical energy.

[0033] The frequency converter module 4 is connected to the power control module 2 and is used to perform frequency conversion processing on the third or fourth electrical energy and supply power to the connected AC motor. When the AC motor brakes, it generates regenerative electrical energy.

[0034] The compensation switching module 6 is connected to the energy storage compensation module 5 and the power supply module 1. When the electrical energy released by the energy storage compensation module 5 is lower than the set low voltage threshold and a first control signal is received, it outputs a switching signal and controls the energy storage compensation module 5 to stop the electrical energy superposition operation.

[0035] In a specific embodiment, the power supply module 1 can be a power circuit composed of a power port, resistors, capacitors, and push-button switches, etc., which can accept AC power and perform step-down, rectification, and filtering of the AC power to provide DC power. When voltage amplification is required, it provides a high-level first control signal. The power control module 2 can be a power control circuit composed of thyristors, transformers, rectifiers, diodes, etc., which can perform power transmission, voltage regulation, and rectification and filtering of the input power. The power supply detection module 3 can be a power supply detection circuit composed of resistors, logic units, inverters, capacitors, etc., which can perform voltage division and energy storage, and set a timing period based on the stored energy. When the power control module 2 is powered off, it provides a high-level signal at regular intervals. Energy storage signal; the frequency conversion module 4 can be a frequency conversion circuit composed of a frequency converter and an output port to perform DC-AC frequency conversion regulation and supply power to the connected AC motor. When the AC motor brakes, it can provide regenerative energy; the energy storage compensation module 5 can be an energy storage compensation circuit composed of capacitors, field-effect transistors, energy storage devices, etc., which can control the transmission path of electrical energy, realize energy storage and discharge, and perform energy superposition with the power control module 2 during discharge; the compensation switching module 6 can be a compensation switching circuit composed of resistors, comparators, logic devices, etc., which can detect the amount of electrical energy stored in the energy storage compensation module 5 and make low-voltage judgments according to the set low-voltage threshold. When the voltage is low, it controls the power control module 2 to perform voltage transformation and controls the energy storage control module to stop the energy superposition operation.

[0036] In another embodiment, please refer to Figure 1 , Figure 2 and Figure 3 The power module 1 includes a power port, a first resistor R1, a first capacitor C1, a first diode D1, a second resistor R2, a fourth resistor R4, a first push-button switch K1, and a ninth resistor R9.

[0037] Specifically, the first end of the power port is connected to one end of the first capacitor C1 and the other end of the first capacitor C1 and the anode of the first diode D1 through the first resistor R1. The cathode of the first diode D1 is connected to one end of the fourth resistor R4 and the first end of the second resistor R2. The other end of the fourth resistor R4 is connected to the moving end of the first push button switch K1. The stationary end of the first push button switch K1 is connected to the first end of the ninth resistor R9 and the compensation switching module 6.

[0038] In a specific embodiment, the first resistor R1, the first capacitor C1, and the first diode D1 are used for voltage reduction and rectification; the first push-button switch K1 is used for voltage diffusion control.

[0039] Furthermore, the power control module 2 includes a first thyristor S1, a first switching transistor V1, a second thyristor S2, a first transformer B1, a third thyristor S3, a first rectifier T1, a third diode D3, a fourth diode D4, and a third capacitor C3; the frequency converter module 4 includes a first frequency converter T2 and an output port.

[0040] Specifically, one end of the first thyristor S1 is connected to one end of the second thyristor S2 and the first end of the power supply port; the other end of the second thyristor S2 is connected to the first end of the primary winding of the first transformer B1; the second end of the primary winding of the first transformer B1 is connected to one end of the third thyristor S3 and the second end of the power supply port; the other end of the first thyristor S1 is connected to the first input terminal of the first rectifier T1 and the first end of the secondary winding of the first transformer B1; the other end of the third thyristor S3 is connected to the second end of the secondary winding of the first transformer B1 and the second input terminal of the first rectifier T1; the first output terminal of the first rectifier T1 is connected to the anode of the third diode D3; and the cathode of the third diode D3... The anode of the fourth diode D4 is connected to the first terminal of the third capacitor C3. The cathode of the fourth diode D4 is connected to the first input terminal of the first frequency converter T2. The second input terminal of the first transformer B1 is connected to the second terminal of the third capacitor C3 and the second output terminal of the first rectifier T1. The first and second output terminals of the first frequency converter T2 are respectively connected to the first and second terminals of the output port. The control terminal of the first thyristor S1 is connected to the control terminal of the third thyristor S3, the collector of the first switch V1, and the second terminal of the second resistor R2. The emitter of the first switch V1 is grounded. The base of the first switch V1 is connected to the control terminal of the second thyristor S2 and the compensation switching module 6.

[0041] In a specific embodiment, the first thyristor S1, the second thyristor S2, and the third thyristor S3 can all be bidirectional thyristors; the first transformer B1 can be composed of four IGBTs, driven by a related MCU and subjected to DC-AC frequency conversion regulation; the first switching transistor V1 can be an NPN transistor.

[0042] Furthermore, the power supply detection module 3 includes a fifth resistor R5, a sixth resistor R6, a first inverter INV1, a second diode D2, a second capacitor C2, and a second logic device J2;

[0043] Specifically, one end of the fifth resistor R5 is connected to the first output terminal of the first rectifier T1, and the other end of the fifth resistor R5 is connected to the anode of the second diode D2 and the input terminal of the first inverter INV1, and is connected to one end of the second capacitor C2 and the second output terminal of the first rectifier T1 through the sixth resistor R6. The cathode of the second diode D2 is connected to the other end of the second capacitor C2 and the B terminal of the second logic device J2, and the output terminal of the first inverter INV1 is connected to the A terminal of the second logic device J2.

[0044] In a specific embodiment, the first inverter INV1 can be a NOT gate; the second logic device J2 can be an AND gate; and the second capacitor C2 stores energy and sets a timing period.

[0045] Furthermore, the energy storage compensation module 5 includes a fourth capacitor C4, a fifth diode D5, a first power transistor Q1, a second power transistor Q2, and an energy storage device;

[0046] Specifically, one end of the fourth capacitor C4 is connected to the first end of the third capacitor C3, and the other end of the fourth capacitor C4 is connected to the anode of the fifth diode D5 and the source of the first power transistor Q1. The drain of the first power transistor Q1 is connected to the first terminal of the energy storage device and the source of the second power transistor Q2. The drain of the second power transistor Q2 is connected to the first input terminal of the first frequency converter T2. The second terminal of the energy storage device is connected to the second terminal of the third capacitor C3. The gate of the first power transistor Q1 is connected to the second terminal of the ninth resistor R9. The cathode of the fifth diode D5 is connected to the cathode of the fourth diode D4. The gate of the second power transistor Q2 is connected to the Y terminal of the second logic device J2.

[0047] In a specific embodiment, both the first power transistor Q1 and the second power transistor Q2 can be N-channel MOSFETs; the energy storage device can be a lithium battery.

[0048] Furthermore, the compensation switching module 6 includes a seventh resistor R7, an eighth resistor R8, a first comparator A1, a first reference power supply VF1, a first logic device J1, and a second switching transistor V2.

[0049] Specifically, one end of the seventh resistor R7 is connected to the first terminal of the energy storage device, and the other end of the seventh resistor R7 is connected to the inverting terminal of the first comparator A1 and connected to the second terminal of the energy storage device through the eighth resistor R8. The non-inverting terminal of the first comparator A1 is connected to the first reference power supply VF1. The output terminal of the first comparator A1 is connected to the A terminal of the first logic device J1. The B terminal of the first logic device J1 is connected to the stationary terminal of the first push button switch K1. The Y terminal of the first logic device J1 is connected to the control terminal of the second thyristor S2 and the base of the second switching transistor V2. The emitter of the second switching transistor V2 is grounded, and the collector of the second switching transistor V2 is connected to the gate of the first power transistor Q1.

[0050] In a specific embodiment, the first reference power supply VF1 provides a low voltage threshold; the first comparator A1 can be an LM358 comparator; the first logic device J1 can be an AND gate; and the second switching transistor V2 can be an NPN transistor.

[0051] This embodiment discloses a power supply control circuit for a frequency converter. AC power is received from the power port. A first resistor R1, a first capacitor C1, and a first diode D1 perform voltage reduction and rectification to output the first power. This triggers the first thyristor S1 and the third thyristor to conduct, allowing the AC power to be rectified and filtered by a first rectifier T1, a third diode D3, a fourth diode D4, and a third capacitor C3 before being transmitted to a first frequency converter T2. This T2 performs DC-AC frequency conversion and supplies power to the AC motor connected to the output port. Simultaneously, a fifth resistor R5 and a sixth resistor R6 perform voltage division, and a second capacitor C2 stores energy. When the AC motor is braked, and the first rectifier T1 stops supplying power, the first inverter INV1 outputs a high level. This, in conjunction with the second capacitor C2, triggers a second logic unit J2 to output an energy storage signal, controlling the second power transistor Q2 to conduct, thus storing the energy. When the regenerative electrical energy generated by the AC motor transmitted by the first frequency converter T2 needs to be amplified for power supply, pressing the first button switch K1 triggers the first power transistor Q1 to conduct. The electrical energy released by the energy storage device is stored by the fourth capacitor C4 and superimposed with the electrical energy stored by the third capacitor C3, thereby providing the fourth electrical energy to the first transformer B1. The seventh resistor R7 and the eighth resistor R8 perform voltage detection on the energy storage device. When the voltage is lower than the low-voltage threshold provided by the first reference power supply VF1, the first comparator A1 outputs a high level, and the first logic device J1 controls the second thyristor S2 and the second switch V2 to conduct, causing the first power transistor Q1 to turn off and the energy storage device to stop discharging. At the same time, the first transformer B1 transforms the AC power connected to the power port, specifically by stepping up the voltage. The transformed electrical energy is rectified by the first rectifier T1 and then supplies power to the first frequency converter T2.

[0052] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A power supply control circuit for a frequency converter, characterized in that, include: Power supply module, power control module, power supply detection module, frequency converter module, energy storage compensation module and compensation switching module; The power module is used to receive AC power, step down and rectify the AC power and output the first power, and output the first control signal when performing voltage diffusion power supply. The power control module is connected to the power module and the compensation switching module. It is used to transmit AC power and receive first power. When it receives the switching signal output by the compensation switching module, it performs voltage transformation on the AC power and outputs second power. It also performs rectification and filtering on the AC power or the second power and outputs third power. The power supply detection module is connected to the power control module and is used to store the third electrical energy and set a timer. When the third electrical energy is stopped, the energy storage signal is output at regular intervals. The energy storage compensation module is connected to the power supply detection module, the frequency converter module and the power control module. When the energy storage signal is received, it stores the regenerated electrical energy generated by the frequency converter module. When the first control signal is received, it superimposes the released electrical energy with the third electrical energy and outputs the fourth electrical energy. The frequency conversion module is connected to the power control module and is used to perform frequency conversion processing on the third or fourth electrical energy and supply power to the connected AC motor. When the AC motor brakes, it generates regenerative electrical energy. The compensation switching module is connected to the energy storage compensation module and the power supply module. When the electrical energy released by the energy storage compensation module is lower than the set low voltage threshold and a first control signal is received, the module outputs a switching signal and controls the energy storage compensation module to stop the electrical energy superposition operation.

2. The inverter power supply control circuit according to claim 1, characterized in that, The power module includes a power port, a first resistor, a first capacitor, a first diode, a second resistor, a fourth resistor, a first push-button switch, and a ninth resistor; The first end of the power port is connected to one end of the first capacitor and the other end of the first capacitor and the anode of the first diode through the first resistor. The cathode of the first diode is connected to one end of the fourth resistor and the first end of the second resistor. The other end of the fourth resistor is connected to the moving end of the first push-button switch. The stationary end of the first push-button switch is connected to the first end of the ninth resistor and the compensation switching module.

3. The inverter power supply control circuit according to claim 2, characterized in that, The power control module includes a first thyristor, a first switching transistor, a second thyristor, a first transformer, a third thyristor, a first rectifier, a third diode, a fourth diode, and a third capacitor; the frequency converter module includes a first frequency converter and an output port. One end of the first thyristor is connected to one end of the second thyristor and the first end of the power port. The other end of the second thyristor is connected to the first end of the primary side of the first transformer. The second end of the primary side of the first transformer is connected to one end of the third thyristor and the second end of the power port. The other end of the first thyristor is connected to the first input terminal of the first rectifier and the first end of the secondary side of the first transformer. The other end of the third thyristor is connected to the second end of the secondary side of the first transformer and the second input terminal of the first rectifier. The first output terminal of the first rectifier is connected to the anode of the third diode. The cathode of the third diode is connected to the anode of the fourth diode and the first end of the third capacitor. The cathode of the fourth diode is connected to the first input terminal of the first frequency converter. The second input terminal of the first transformer is connected to the second end of the third capacitor and the second output terminal of the first rectifier. The first output terminal and the second output terminal of the first frequency converter are respectively connected to the first end and the second end of the output port. The control terminal of the first thyristor is connected to the control terminal of the third thyristor, the collector of the first switching transistor, and the second end of the second resistor. The emitter of the first switching transistor is grounded. The base of the first switching transistor is connected to the control terminal of the second thyristor and the compensation switching module.

4. The inverter power supply control circuit according to claim 3, characterized in that, The power supply detection module includes a fifth resistor, a sixth resistor, a first inverter, a second diode, a second capacitor, and a second logic unit. One end of the fifth resistor is connected to the first output terminal of the first rectifier, and the other end of the fifth resistor is connected to the anode of the second diode and the input terminal of the first inverter, and is connected to one end of the second capacitor and the second output terminal of the first rectifier through the sixth resistor. The cathode of the second diode is connected to the other end of the second capacitor and the B terminal of the second logic device, and the output terminal of the first inverter is connected to the A terminal of the second logic device.

5. The inverter power supply control circuit according to claim 3, characterized in that, The energy storage compensation module includes a fourth capacitor, a fifth diode, a first power transistor, a second power transistor, and an energy storage device. One end of the fourth capacitor is connected to the first end of the third capacitor, and the other end of the fourth capacitor is connected to the anode of the fifth diode and the source of the first power transistor. The drain of the first power transistor is connected to the first end of the energy storage device and the source of the second power transistor. The drain of the second power transistor is connected to the first input terminal of the first frequency converter. The second end of the energy storage device is connected to the second end of the third capacitor. The gate of the first power transistor is connected to the second end of the ninth resistor. The cathode of the fifth diode is connected to the cathode of the fourth diode. The gate of the second power transistor is connected to the Y terminal of the second logic device.

6. The inverter power supply control circuit according to claim 3, characterized in that, The compensation switching module includes a seventh resistor, an eighth resistor, a first comparator, a first reference power supply, a first logic unit, and a second switching transistor. One end of the seventh resistor is connected to the first terminal of the energy storage device, and the other end of the seventh resistor is connected to the inverting terminal of the first comparator and connected to the second terminal of the energy storage device through the eighth resistor. The non-inverting terminal of the first comparator is connected to the first reference power supply. The output terminal of the first comparator is connected to the A terminal of the first logic device. The B terminal of the first logic device is connected to the stationary terminal of the first push-button switch. The Y terminal of the first logic device is connected to the control terminal of the second thyristor and the base of the second switching transistor. The emitter of the second switching transistor is grounded, and the collector of the second switching transistor is connected to the gate of the first power transistor.

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