High frequency pit repair control system

Abstract

The application discloses a high-frequency pit repairing control system, which comprises a control unit, a driving circuit, an isolation switch circuit, an induction heating circuit, a power feedback circuit and a power supply circuit. During the pit repairing process, the change of the workpiece surface pit will cause the change of the system input side current. Therefore, the power feedback circuit collects the input side power information and outputs corresponding pulse waves to the control unit, so that the control unit adjusts the PWM signal according to the pulse waves and adjusts the output power of the system in real time. The continuous fine adjustment can be realized according to the pit repairing change during the pit repairing process, the repairing process is smoother, and the repairing efficiency and the repairing precision are improved.

Description

Technical Field

[0001] This invention relates to the field of dent repair technology, and more specifically to a high-frequency dent repair control system. Background Technology

[0002] Traditional automotive dent repair typically employs mechanical pulling methods. For example, CN201920077747.5 discloses a non-marking automotive sheet metal dent repair puller, which includes a side panel bracket, a guide rod, and a pull block mechanism. Two guide rods are fixed side-by-side between two side panel brackets, and the pull block mechanism is slidably mounted on the guide rods. In use, hot melt adhesive is first applied to the bottom of the pull block 37, and then the pull block 37 with the adhesive applied to its bottom is adhered to the corresponding dented sheet metal part. Different sized pull blocks 37 can be used for dents of different sizes. The base 12 of the side panel bracket 1 is then placed against the surface of the automotive sheet metal part, and the handwheel 32 is manually turned. The handwheel 32 pulls up the long screw 33, the collet 35, and the pull block 37, which in turn pulls the dented sheet metal part flat. This method is cumbersome and may cause secondary damage to the paint surface of the sheet metal part.

[0003] Therefore, an electromagnetic puller has emerged on the market. It generates a pulsed magnetic field by applying a high-frequency, high-amplitude pulsed current to a primary coil, which in turn induces eddy currents in a highly conductive workpiece. This generates a repulsive force away from the coil, repairing dents and restoring the surface of automotive sheet metal parts to a smooth finish. However, for workpieces of different thicknesses, only a few preset power levels can be used to achieve a fixed output power, making it impossible to adjust the output power during the repair process. This could potentially damage the paint on the sheet metal parts. Therefore, this control method is unsuitable for refined repair needs, and for deeper dents, frequent switching of the power level is required, resulting in low repair efficiency.

[0004] The purpose of this application is to provide a high-frequency dent repair control system that can solve at least one of the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to at least partially solve one of the technical problems in the related art. In view of this, a high-frequency dent repair control system is provided, comprising: a control unit, a drive circuit, an isolating switch circuit, an induction heating circuit, a power feedback circuit, and a power supply circuit. The power supply circuit is equipped with sampling points. The power feedback circuit is electrically connected to the sampling points of the control unit and the power supply circuit respectively. The drive circuit is electrically connected to the control unit through the isolation switch circuit. The drive circuit is electrically connected to the induction heating circuit, the control unit, and the power supply circuit respectively. The control unit and the isolation switch circuit are electrically connected to the power supply circuit respectively. The power feedback circuit is used to collect power information at the sampling point and output a corresponding pulse wave to the control unit. The control unit outputs a corresponding PWM signal to the drive circuit according to the pulse wave to adjust the output power of the drive circuit. It is also used to control the working state of the drive circuit by adjusting the conduction state of the isolation switch circuit.

[0006] Compared with the prior art, the technical solution of the present invention has the following advantages: Since the changes in the surface depression of the workpiece during the pit repair process will cause changes in the current on the input side of the system, the power feedback circuit collects the power information on the input side and outputs the corresponding pulse wave to the control unit, so that the control unit adjusts the PWM signal according to the pulse wave and outputs it to the drive circuit, thereby adjusting the output power of the system in real time. This enables continuous fine-tuning according to the repair changes of the pit on the workpiece during the pit repair process, making the repair process smoother and improving repair efficiency and repair accuracy.

[0007] According to one example of the present invention, the power feedback circuit includes a sampling voltage divider unit, a power acquisition chip, and an optocoupler isolation unit connected in sequence. The sampling voltage divider unit is electrically connected to the sampling point of the power supply circuit, and the optocoupler isolation unit is electrically connected to the control unit.

[0008] According to one embodiment of the present invention, a current feedback circuit is further included. A current feedback circuit is provided between the driving circuit and the induction heating circuit. The current feedback circuit is electrically connected to the control unit. The control unit is used to control the conduction state of the isolating switch circuit according to the output current information collected by the current feedback circuit.

[0009] According to one example of the present invention, a heating switch is further included, which is electrically connected to the induction heating circuit and electrically connected to the control unit via a first optocoupler unit, which is electrically connected to the power supply circuit.

[0010] According to one example of the present invention, a temperature acquisition unit is further included for acquiring the temperature of the power switch tube in the drive circuit. The temperature acquisition unit is electrically connected to the control unit, and the control unit is used to control the conduction state of the isolation switch circuit based on the temperature information acquired by the temperature acquisition unit.

[0011] According to one example of the present invention, a user interaction unit is further included, the user interaction unit including a key input module, the key input module being electrically connected to the control unit.

[0012] According to one example of the present invention, the user interaction unit further includes a display module, which is electrically connected to the control unit and the power supply circuit respectively.

[0013] According to one example of the present invention, the induction heating circuit includes a magnetic core on which a coil is wound, and the magnetic core is a U-shaped ferrite core.

[0014] According to one example of the present invention, the isolating switch circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first optocoupler, a first transistor, and a first switching transistor; One end of the first resistor is electrically connected to the control unit, and the other end of the first resistor is electrically connected to the transmitter of the first optocoupler. A second resistor is connected in series between one end of the first resistor and the ground terminal. One end of the receiver of the first optocoupler is electrically connected to the power supply circuit and the collector of the first transistor. The other end of the receiver of the first optocoupler is connected in series with a third resistor and a fourth resistor and then electrically connected to the source of the first switching transistor. The drain of the first switching transistor is electrically connected to the power supply circuit. A fifth resistor is connected in series between the gate of the first switching transistor and the emitter of the first transistor. The base of the first transistor is electrically connected to the connection point between the third and fourth resistors. A sixth resistor is connected in series between the gate of the first switching transistor and its source. The source of the first switching transistor is electrically connected to the drive circuit.

[0015] According to an example of the present invention, the current feedback circuit includes a current acquisition unit and a signal amplification and shaping unit; one end of the induction heating circuit is electrically connected to the drive circuit through the current acquisition unit, the input end of the signal amplification and shaping unit is electrically connected to the current acquisition unit, and the output end of the signal amplification and shaping unit is electrically connected to the control unit.

[0016] According to an example of the present invention, the power supply circuit includes a first voltage conversion unit and a second voltage conversion unit connected in series; the first voltage conversion unit is electrically connected to a power feedback circuit, an isolating switch circuit, and an AC power supply respectively; the second voltage conversion unit is electrically connected to a power feedback circuit, an isolating switch circuit, a drive circuit, and a control unit respectively; and the second voltage conversion unit is electrically connected to the control unit through a zero-crossing detection unit.

[0017] The following benefits can be obtained by adopting this technical solution: By acquiring the system's input power, the output power of the precise control system is realized, enabling more refined control of the repair and forming process, better forming results, and faster closed-loop control response, achieving smooth and adaptive power control. A current feedback circuit monitors the output current flowing through the induction heating circuit. When an abnormality occurs causing overcurrent, the control unit can promptly control the isolating switch circuit to shut down the drive circuit. By placing a first optocoupler unit between the heating switch and the control unit, interference from high-frequency signals to the key input module is avoided, preventing key signal distortion. Furthermore, the on / off state of the induction heating circuit can be controlled via the heating switch, enhancing reliability.

[0018] Multiple power levels can be set via the button input module to match workpieces of different thicknesses. At the start of operation, the user sets the power level and heating time according to the workpiece thickness. The control unit outputs the corresponding PWM signal to the drive circuit based on the set power level and heating time. During the dent repair process, as the dent gradually becomes flat, the output power generally needs to be gradually reduced to avoid overstretching. This allows for continuous fine adjustment of the output power at the set level to achieve the best heating and repair effect. The operation is simpler, and the use of pulsating DC improves the energy utilization rate of the subsequent drive. Phase detection can avoid generating a large amount of reactive power loss.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a structural principle block diagram of a high-frequency dent repair control system provided in an embodiment of the present invention; Figure 2 yes Figure 1 Circuit schematics of the central control unit and user interaction unit; Figure 3 yes Figure 1 The circuit diagram of the first voltage conversion unit and power feedback circuit; Figure 4 yes Figure 1 Circuit schematic diagram of the second voltage conversion unit and the zero-crossing detection unit; Figure 5 yes Figure 2 Circuit diagram of the drive circuit, disconnect switch circuit, and current feedback circuit.

[0022] The attached diagram is labeled as follows: 1. Control unit; 2. Drive circuit; 21. Full-bridge drive unit; 22. Power switch unit; 3. Isolation switch circuit; 4. Induction heating circuit; 5. Power feedback circuit; 51. Sampling voltage divider unit; 52. Power acquisition chip; 53. Optocoupler isolation unit; 6. Power supply circuit; 61. First voltage conversion unit; 62. Second voltage conversion unit; 63. Zero-crossing detection unit; 7. Current feedback circuit; 71. Current acquisition unit; 72. Signal amplification and shaping unit; 8. Heating switch; 9. User interaction unit; 91. Key input module; 92. Display module; 10. Temperature acquisition unit; 11. First optocoupler unit. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] Please see Figure 1-5 As shown, the present invention provides a high-frequency dent repair control system, including: a control unit 1, a drive circuit 2, an isolating switch circuit 3, an induction heating circuit 4, a power feedback circuit 5, and a power supply circuit 6; The power supply circuit 6 is equipped with sampling points. The power feedback circuit 5 is electrically connected to the sampling points of the control unit 1 and the power supply circuit 6 respectively. The drive circuit 2 is electrically connected to the control unit 1 through the isolation switch circuit 3. The drive circuit 2 is electrically connected to the induction heating circuit 4, the control unit 1, and the power supply circuit 6 respectively. The control unit 1 and the isolation switch circuit 3 are electrically connected to the power supply circuit 6 respectively.

[0025] The power feedback circuit 5 is used to collect power information at the sampling point and output the corresponding pulse wave to the control unit 1. The control unit 1 outputs the corresponding PWM signal to the drive circuit 2 according to the pulse wave to adjust the output power of the drive circuit 2. It is also used to control the working state of the drive circuit 2 by adjusting the conduction state of the isolation switch circuit 3.

[0026] The drive circuit 2 includes a full-bridge drive unit 21 and a power switch unit 22. The power switch unit 22 includes four connected power switch transistors. The control terminal of each power switch transistor is connected to the corresponding full-bridge drive unit 21. The full-bridge drive unit 21 is electrically connected to the control unit 1 and the power supply circuit 6. The drains of the two power switch transistors at the upper end of the full-bridge drive unit 21 are connected to the isolation switch circuit 3.

[0027] An isolating switch circuit 3 is added to the upper end of the drive circuit 2 and controlled by the control unit 1. When a fault occurs, the power supply to the drive circuit 2 is cut off in time, which can realize rapid power-off protection. This is safer and more thorough than simply shutting down the drive signal of the drive circuit 2, and has strong anti-interference ability. The control unit 1 outputs a PWM signal with a set frequency range. Through the alternating conduction of power switches Q4, Q3 and Q2, Q5, magnetic fields with different directions are generated. By adjusting the PWM signal by the control unit 1, stepless adjustment of the output power can be achieved, and the closed-loop response speed is fast.

[0028] like Figure 5 As shown, the induction heating circuit 4 includes a magnetic core T1 with an induction coil wound around it. The magnetic core T1 is a U-shaped ferrite core. Both ends of the induction coil are electrically connected to the drive circuit 2. The magnetic core T1 and the induction coil are encapsulated in a housing. A shielding layer is provided within the housing, circumferentially surrounding the induction coil. This guides the magnetic field from both ends of the U-shaped ferrite core, confining most of the magnetic lines of force within a narrow area between the U-shaped poles. This efficiently concentrates the magnetic field. The eddy currents induced in the conductive workpiece by the magnetic field generated by the high-frequency current are concentrated on the surface of the sheet metal workpiece, limiting the heating area to the outer surface of the sheet metal and achieving precise "point" or "line" heating. A silicone pad is placed at the part of the magnetic core T1 that contacts the sheet metal to ensure a tight fit with the curved surface of the sheet metal, reducing air gaps in the magnetic circuit and allowing the magnetic field to penetrate the metal more effectively.

[0029] like Figure 3 As shown, the power feedback circuit 5 includes a sampling voltage divider unit 51, a power acquisition chip 52, and an optocoupler isolation unit 53 connected in sequence. The sampling voltage divider unit 51 is electrically connected to the sampling point of the power supply circuit 6, and the optocoupler isolation unit 53 is electrically connected to the control unit 1.

[0030] The power acquisition chip 52 outputs a corresponding pulse wave through the sampling voltage divider unit 51, which turns on the optocoupler in the optocoupler isolation unit 53. The control unit 1 reads the pulse wave of the optocoupler secondary to determine the power status of the drive circuit 2 at the working moment, which is used to indirectly determine the degree of dent repair and prepare for power adjustment. Among them, resistor R58 is a sampling resistor, and the V1P and V1N pins of the power acquisition chip 52 are used to acquire current, and the V2P pin is used to acquire voltage.

[0031] like Figure 2As shown, the system also includes a user interaction unit 9, which includes a button input module 91 electrically connected to the control unit 1. The button input module 91 includes several power levels and several time levels, used to manually increase or decrease the output power and manually increase or decrease the heating time. The user interaction unit 9 also includes a display module 92, which is electrically connected to both the control unit 1 and the power supply circuit 6. The display module 92 is connected to the control unit 1 via interface U1, enhancing operational convenience and user experience through human-computer interaction.

[0032] When the control unit 1 determines from the received pulse wave that the current input power exceeds the power corresponding to the current set power level, it triggers overvoltage protection.

[0033] like Figure 3-4 As shown, the power supply circuit 6 includes a first voltage conversion unit 61 and a second voltage conversion unit 62 connected in series. The first voltage conversion unit 61 is electrically connected to the power feedback circuit 5, the isolating switch circuit 3, and the AC power supply, respectively. The second voltage conversion unit 62 is electrically connected to the power feedback circuit 5, the isolating switch circuit 3, the drive circuit 2, and the control unit 1, respectively. The second voltage conversion unit 62 is electrically connected to the control unit 1 through the zero-crossing detection unit 63.

[0034] The first voltage conversion unit 61 outputs HV voltage from the rectifier bridge BR1, with the sampling point set at the input terminal of the rectifier bridge BR1. It powers the sampling voltage divider unit 51 of the power feedback circuit 5 and, via the isolating switch circuit 3, the drive circuit 2. The second voltage conversion unit 62 draws power from the input terminal of the rectifier bridge BR1 and outputs 12V, 15V, 5V, and 5.25V, respectively powering the power feedback circuit 5, the isolating switch circuit 3, the full-bridge drive unit 21 of the drive circuit 2, and the control unit 1. The relatively independent power supplies reduce mutual interference and improve system stability. Using optocouplers for zero-crossing detection is more stable than using transistors, suppressing inrush current and extending component life.

[0035] like Figure 5 As shown, the isolating switch circuit 3 includes a first resistor R1, a second resistor R3, a third resistor R10, a fourth resistor R4, a fifth resistor R2, a sixth resistor R5, a first optocoupler H6, a first transistor Q6, and a first switching transistor Q1.

[0036] One end of the first resistor R1 is electrically connected to the control unit 1, and the other end of the first resistor R1 is electrically connected to the transmitter of the first optocoupler H6. A second resistor R3 is connected in series between one end of the first resistor R1 and the ground terminal. One end of the receiver of the first optocoupler H6 is electrically connected to the +12V voltage output by the power supply circuit 6 and the collector of the first transistor Q6. The other end of the receiver of the first optocoupler H6 is connected in series with a third resistor R10 and a fourth resistor R4 and then electrically connected to the source of the first switching transistor Q1. The drain of the first switching transistor Q1 is electrically connected to the HV voltage output by the power supply circuit 6. A fifth resistor R2 is connected in series between the gate of the first switching transistor Q1 and the emitter of the first transistor Q6. The base of the first transistor Q6 is electrically connected to the connection point between the third resistor R10 and the fourth resistor R4. A sixth resistor R5 is connected in series between the gate of the first switching transistor Q1 and its source. The source of the first switching transistor Q1 is electrically connected to the drain of the two power switching transistors at the upper end of the full-bridge drive unit 21 in the drive circuit 2.

[0037] like Figure 5 As shown, it also includes a current feedback circuit 7. A current feedback circuit 7 is provided between the drive circuit 2 and the induction heating circuit 4. The current feedback circuit 7 is electrically connected to the control unit 1. The control unit 1 is used to control the conduction state of the isolation switch circuit 3 according to the output current information collected by the current feedback circuit 7.

[0038] The current feedback circuit 7 includes a current acquisition unit 71 and a signal amplification and shaping unit 72. The two ends of the induction heating circuit 4 are electrically connected to the drive circuit 2 through the current acquisition unit 71, the input end of the signal amplification and shaping unit 72 is electrically connected to the current acquisition unit 71, and the output end of the signal amplification and shaping unit 72 is electrically connected to the control unit 1.

[0039] When the control unit 1 detects that the collected output current is less than the set threshold, the control unit 1 determines that the induction heating circuit 4 is not in contact with the conductor workpiece, and blocks the PWM signal or controls the isolation switch circuit 3 to turn off.

[0040] like Figure 1 As shown, the high-frequency dent repair control system also includes a heating switch 8 mounted on the housing. The heating switch 8 is electrically connected to the induction heating circuit 4, and the heating switch 8 is electrically connected to the control unit 1 through the first optocoupler unit 11. The first optocoupler unit 11 is electrically connected to the +5V output of the power supply circuit 6. The connection between the heating switch 8 and the induction heating circuit 4 adopts a conventional structure. When in use, pressing the heating switch 8 powers on the induction heating circuit 4.

[0041] like Figure 5As shown, the high-frequency dent repair control system also includes a temperature acquisition unit 10 for acquiring the temperature of the power switch tube in the power switch unit 22 of the drive circuit 2. The temperature acquisition unit is electrically connected to the control unit 1, and the control unit 1 is used to control the conduction state of the isolation switch circuit 3 based on the temperature information acquired by the temperature acquisition unit 10. An additional temperature acquisition unit can also be provided for acquiring the temperature of the induction coil T1 in the induction heating circuit 4 to provide over-temperature protection for the induction coil T1.

[0042] The temperature acquisition unit 10 uses a high-precision temperature switch, and the power switch tube of the power switch unit 22 is mounted on the heat sink, with the temperature switch mounted on the heat sink.

[0043] This system offers precise energy control and high repair accuracy. During the repair process, it prevents excessive stretching and the formation of "bumps" when repairing shallow depressions, and eliminates the need for repeated power level switching when repairing deep depressions, resulting in high repair efficiency. It also enables gradual force control on curved surfaces and edges. Utilizing a high-frequency H-bridge drive, power feedback circuit 5 detects the power from the preceding stage, and current feedback circuit 7 detects the output current. A high-precision temperature switch ensures fast system response and timely dynamic feedback, minimizing step deformation during repair and enabling a continuous and smooth stretching process.

[0044] It is easy to operate, highly intelligent, and can perform status monitoring. It ensures electrical safety through multiple isolations and adopts multiple temperature protection mechanisms, making it less prone to overheating and damage during continuous operation.

[0045] It can proactively warn of abnormal conditions such as over-temperature, over-current, and over-voltage, preventing damage to the induction coil and control unit 1 in the induction heating circuit 4. Once an abnormality occurs, the control unit 1 can immediately protect the system by shutting down the PWM or disconnecting the isolation switch circuit 3.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0049] For those skilled in the art, various changes and modifications will undoubtedly be apparent after reading the above description. Therefore, the appended claims should be construed as covering all changes and modifications that encompass the true intent and scope of the invention. Any and all equivalent scope and content within the scope of the claims should be considered to remain within the intent and scope of the invention.

Claims

1. A high-frequency dent repair control system, characterized in that, include: Control unit, drive circuit, disconnect switch circuit, induction heating circuit, power feedback circuit, power supply circuit; The power supply circuit is equipped with sampling points. The power feedback circuit is electrically connected to the sampling points of the control unit and the power supply circuit respectively. The drive circuit is electrically connected to the control unit through the isolation switch circuit. The drive circuit is electrically connected to the induction heating circuit, the control unit, and the power supply circuit respectively. The control unit and the isolation switch circuit are electrically connected to the power supply circuit respectively. The power feedback circuit is used to collect power information at the sampling point and output a corresponding pulse wave to the control unit. The control unit outputs a corresponding PWM signal to the drive circuit according to the pulse wave to adjust the output power of the drive circuit. It is also used to control the working state of the drive circuit by adjusting the conduction state of the isolation switch circuit.

2. The high-frequency dent repair control system as described in claim 1, characterized in that: The power feedback circuit includes a sampling voltage divider unit, a power acquisition chip, and an optocoupler isolation unit connected in sequence. The sampling voltage divider unit is electrically connected to the sampling point of the power supply circuit, and the optocoupler isolation unit is electrically connected to the control unit.

3. The high-frequency dent repair control system as described in claim 1, characterized in that: It also includes a current feedback circuit. A current feedback circuit is provided between the drive circuit and the induction heating circuit. The current feedback circuit is electrically connected to the control unit. The control unit is used to control the conduction state of the isolating switch circuit according to the output current information collected by the current feedback circuit.

4. The high-frequency dent repair control system as described in claim 1, characterized in that: It also includes a heating switch, which is electrically connected to the induction heating circuit. The heating switch is electrically connected to the control unit through a first optocoupler unit, which is electrically connected to the power supply circuit.

5. The high-frequency dent repair control system as described in claim 1, characterized in that: It also includes a temperature acquisition unit for acquiring the temperature of the power switching transistor in the drive circuit. The temperature acquisition unit is electrically connected to the control unit, and the control unit is used to control the conduction state of the isolation switch circuit based on the temperature information acquired by the temperature acquisition unit.

6. Temperature of the induction coil in the induction heating circuit The high-frequency dent repair control system as described in claim 1 is characterized in that: It also includes a user interaction unit, which includes a key input module that is electrically connected to the control unit.

7. The high-frequency dent repair control system as described in claim 1, characterized in that: The induction heating circuit includes a magnetic core on which a coil is wound. The magnetic core is a U-shaped ferrite core.

8. The high-frequency dent repair control system as described in any one of claims 1-7, characterized in that: The isolating switch circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first optocoupler, a first transistor, and a first switching transistor; One end of the first resistor is electrically connected to the control unit, and the other end of the first resistor is electrically connected to the transmitter of the first optocoupler. A second resistor is connected in series between one end of the first resistor and the ground terminal. One end of the receiver of the first optocoupler is electrically connected to the power supply circuit and the collector of the first transistor. The other end of the receiver of the first optocoupler is connected in series with a third resistor and a fourth resistor and then electrically connected to the source of the first switching transistor. The drain of the first switching transistor is electrically connected to the power supply circuit. A fifth resistor is connected in series between the gate of the first switching transistor and the emitter of the first transistor. The base of the first transistor is electrically connected to the connection point between the third and fourth resistors. A sixth resistor is connected in series between the gate of the first switching transistor and its source. The source of the first switching transistor is electrically connected to the drive circuit.

9. The high-frequency dent repair control system as described in claim 3, characterized in that: The current feedback circuit includes a current acquisition unit and a signal amplification and shaping unit; one end of the induction heating circuit is electrically connected to the drive circuit through the current acquisition unit, the input end of the signal amplification and shaping unit is electrically connected to the current acquisition unit, and the output end of the signal amplification and shaping unit is electrically connected to the control unit.

10. The high-frequency dent repair control system as described in any one of claims 1-7 and 9, characterized in that: The power supply circuit includes a first voltage conversion unit and a second voltage conversion unit connected in series. The first voltage conversion unit is electrically connected to the power feedback circuit, the isolating switch circuit, and the AC power supply, respectively. The second voltage conversion unit is electrically connected to the power feedback circuit, the isolating switch circuit, the drive circuit, and the control unit, respectively. The second voltage conversion unit is electrically connected to the control unit through a zero-crossing detection unit.

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