Medium-frequency inversion resistance welding power supply control box

Abstract

The utility model relates to an intermediate frequency inversion resistance welding power supply control box, which comprises a protective shell, one side in the protective shell is provided with a mounting bracket, and the mounting bracket is provided with a capacitor unit; a water cooling plate is arranged at the bottom of the other side in the protective shell, a strong current working unit and a circuit mounting plate are mounted on the water cooling plate, and the circuit mounting plate is located above the strong current working unit; and a weak current control unit is mounted on the circuit mounting plate. According to the utility model, the circuit in the power supply control box can be effectively cooled, and good thermal stability of the circuit is ensured. Meanwhile, by adopting a strong current and weak current area isolation and single control board scheme, the circuit structure can be simplified, the use and the maintenance are more convenient, the signal influence of the electromagnetic effect caused by strong current on the circuit control board is weakened, and the output current of the medium-frequency inverter resistance welding power supply controller can be kept stable under the ultrahigh current welding working condition.

Description

Technical Field

[0001] The utility model relates to the technical field of medium frequency welding machines, in particular to a medium frequency inverter resistance welding power supply control box. Background Art

[0002] Resistance welding is a commonly used metal welding method. It uses the principle of resistance heating to heat the metal joint to the melting point, and then applies pressure to make it reach a bonding state. It is mainly suitable for metal materials with good conductivity, such as steel, aluminum and copper. In order to ensure the quality of welding, it is necessary to control the size and duration of the welding current through the power controller to achieve active control of the resistance welding process. Commonly used industrial frequency resistance welding uses an industrial frequency power controller, which uses a low-frequency power supply (usually 50 or 60Hz) and can output a low welding current, generally around a few hundred amperes. It is easy to generate noise and electromagnetic interference during welding, which has a greater impact on the power grid, has relatively low energy efficiency, and has poor welding accuracy. Compared with industrial frequency resistance welding, the power controller of medium frequency resistance welding uses a high-frequency power supply (higher than 1kHz) and a higher welding current, which can theoretically reach several thousand amperes to tens of thousands of amperes. The resistance heat generated by the high-frequency current inside the joint can quickly heat the metal, and can also help exhaust the gas in the weld through the electromagnetic force effect, which can effectively improve the welding speed and quality. However, the ultra-high current output stability of medium-frequency solder mask is affected by the thermal stability of power devices in the power controller and the circuit structure design, which is a major obstacle to the development of medium-frequency solder mask equipment. Utility Model Content

[0003] In order to solve the technical problems mentioned in the background technology, the utility model proposes a medium-frequency inverter resistance welding power supply control box with good thermal stability and capable of achieving stable output of ultra-large welding current.

[0004] In one aspect, the utility model provides a medium-frequency inverter welding power supply control box, including a protective shell, a mounting bracket is provided on one side of the protective shell, and a capacitor unit is installed on the mounting bracket; a water cooling plate is provided on the other side of the protective shell near the shell, and a high-voltage working unit and a circuit installation plate are installed on the water cooling plate, and the circuit installation plate and the high-voltage working unit are installed in layers above and below; a low-voltage control unit is installed on the circuit installation plate.

[0005] In one aspect, a heat dissipation unit is also included for cooling the weak current control unit.

[0006] In one aspect, the capacitor unit includes a storage capacitor and a filter capacitor connected in parallel.

[0007] In one aspect, a plurality of the energy storage capacitors are connected in parallel via at least two copper bars, and the withstand voltage of the energy storage capacitors is ≥400V, and the capacitance is ≥1000μf.

[0008] In one aspect, the capacitance of the filter capacitor is ≤20 μf.

[0009] In one aspect, the high-voltage working unit includes an insulated gate bipolar transistor (IGBT), a current sensor, a protection resistor, and a rectifier, wherein the IGBT, the protection resistor, and the rectifier are connected in parallel with the capacitor unit, and the output end of the IGBT passes through the current sensor.

[0010] In one aspect, the number of the IGBTs and the number of the protection resistors are two or more, and the IGBTs and the protection resistors are symmetrically mounted in parallel on the water cooling plate.

[0011] In one aspect, at least three of the rectifiers are mounted on the water cooling plate in parallel with the IGBT and the protection resistor.

[0012] In one aspect, the input end of the rectifier is connected to a three-phase input copper plate, the output end of the IGBT is connected to an output copper plate, the output copper plate passes through the current sensor, the three-phase input copper plate and the output copper plate are connected from the wiring port under the protective shell, and the protection resistor is installed on both sides of the water cooling plate.

[0013] In one aspect, the output end of the IGBT on either side is connected to the output copper plate on the same side, and the control end of the IGBT is connected to the weak current control unit.

[0014] In one aspect, the positive output terminal of the rectifier is connected to the positive input terminal of the IGBT via a positive connection copper plate, and the negative output terminal of the rectifier is connected to the negative input terminal of the IGBT via a negative connection copper plate.

[0015] In one aspect, the positive electrode connecting copper plate and the negative electrode connecting copper plate are arranged in layers below the circuit mounting board, the positive electrode connecting copper plate is connected to the positive electrode of the capacitor unit, and the negative electrode connecting copper plate is connected to the negative electrode of the capacitor unit.

[0016] In one aspect, the weak current control unit includes a circuit control board.

[0017] In one aspect, the heat dissipation unit includes a heat dissipation fan, and the heat dissipation fan is mounted on a fan mounting plate, and the fan mounting plate is located above the weak current control unit.

[0018] In one aspect, a switch and an emergency stop button are provided on the compartment door of the protective housing.

[0019] The medium frequency inverter welding power supply control box provided by the embodiment of the utility model can effectively cool the circuit in the power supply control box to ensure that it has good thermal stability. At the same time, the strong and weak current area isolation and single control board solution can simplify the circuit structure, make it more convenient to use and maintain, reduce the influence of the electromagnetic effect caused by strong electricity on the signal of the circuit control board, and also make the output current of the medium frequency inverter welding power supply controller stable in ultra-high welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0021] Figure 1 This is a schematic diagram of the main internal components and their positions of the utility model;

[0022] Figure 2 It is a lateral side view of the internal structure of the utility model;

[0023] Figure 3 It is an internal front view of the utility model;

[0024] Figure 4 This is the appearance diagram of the utility model;

[0025] Figure 5 It is a schematic diagram of the connection between the rectifier, IGBT and capacitor of the utility model;

[0026] Figure 6 It is a schematic diagram of the circuit structure of the utility model.

[0027] Among them, 100. Installation bracket; 200. Capacitor unit; 300. High-voltage working unit; 400. Low-voltage control unit; 1. Energy storage capacitor; 2. Insulated gate bipolar transistor (IGBT); 3. Current sensor; 4. Protection resistor; 5. Rectifier; 6. Water cooling plate; 7. Cooling fan; 8. Circuit control board; 9. Protective casing; 10. Switch; 11. Three-phase input copper plate; 12. Output copper plate; 13. Filter capacitor; 14. Fan mounting plate; 15. Circuit mounting plate; 16. Negative pole connection copper plate; 17. Positive pole connection copper plate.

[0028] The above drawings have shown clear embodiments of the present invention, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present invention in any way, but to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0029] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the utility model. Instead, they are only examples of devices and methods consistent with some aspects of the utility model as detailed in the attached claims.

[0030] The utility model provides a medium frequency inverter resistance welding power supply control box. Figure 1 It is a schematic diagram of the main internal components and their positions of the utility model, such as Figure 1 As shown, in some embodiments, the medium frequency inverter welding power supply control box includes a protective shell 9, a mounting bracket 100 is provided on one side of the protective shell 9, and a capacitor unit 200 is installed on the mounting bracket 100; a water cooling plate 6 is provided at a position close to the shell on the other side of the protective shell 9, and a high-voltage working unit 300 and a circuit installation board 15 are installed on the water cooling plate 6, and the circuit installation board 15 and the high-voltage working unit 300 are installed in layers above and below, and the circuit installation board 15 is located above the high-voltage working unit 300; a low-voltage control unit 400 is installed on the circuit installation board 15.

[0031] Figure 1 This is a schematic diagram of the main internal components and their positions of the utility model. Figure 1 The internal components of the medium frequency inverter soldering power supply control box and their relative positions are clearly shown. Figure 1 The protective housing 9 is only one side of the power control box housing. The complete protective housing 9 has a three-dimensional closed structure, such as Figure 4 The cube shown.

[0032] In this embodiment, a mounting bracket 100 is provided on the protective casing, and the mounting bracket 100 is used to install a capacitor unit 200. The capacitor unit 200 can play a role of filtering and / or energy storage, and is used to eliminate voltage fluctuations of the input control box, remove high-frequency interference signals in the power supply, and store energy, etc.

[0033] In this embodiment, a water-cooled plate 6 is provided at the bottom of the other side of the capacitor unit 200 in the protective housing 9 (the position closer to the housing), wherein the other side is included in the opposite side or the adjacent other side. The present utility model does not limit the material and shape of the water-cooled plate 6. The water-cooled plate 6 is mainly used for heat dissipation, and can also be used to install components in the power control box, acting as a bracket. The components installed on the water-cooled plate 6 can quickly dissipate heat through it, thereby maintaining the safety and stability of the components in the power control box during operation.

[0034] like Figure 1As shown, a strong electric working unit 300 and a circuit mounting plate 15 are installed on the water-cooled plate 6, and the circuit mounting plate 15 is located above the strong electric working unit 300, and a weak electric control unit 400 is installed on the circuit mounting plate 15. Among them, the strong electric working unit 300 may include an insulated gate bipolar transistor IGBT and a rectifier, etc., and the weak electric control unit 400 may include a circuit control circuit, etc. The present utility model does not limit the composition and structure of the strong electric working unit 300 and the weak electric control unit 400. In this embodiment, the strong electric working unit 300 and the circuit mounting plate 15 are installed on the water-cooled plate 6 in a layered manner, and the circuit mounting plate 15 separates the strong electric working unit 300 and the weak electric control unit 400, that is, separates the strong electric working area and the weak electric control area, so that the two areas can work without affecting each other.

[0035] The medium frequency inverter resistance welding power supply control box provided in this embodiment has a water cooling plate arranged inside it to ensure the safety and thermal stability of the circuit in the power supply control box during operation. The circuit installation plate separates the high-voltage working area and the low-voltage control area, so that the two areas can work without affecting each other, weakening signal interference, avoiding accidental circuit short circuit, and further enhancing the safety and thermal stability of the circuit in the power supply control box during operation.

[0036] Figure 2 It is a lateral side view of the internal structure of the utility model. Figure 3 This is the internal front view of the utility model. Figure 5 The figure is a schematic diagram of the connection between the rectifier, IGBT and capacitor of the utility model. Figure 2 , Figure 3 and Figure 5 As shown, in some embodiments, the capacitor unit 200 includes a parallel energy storage capacitor 1 and a filter capacitor 13. The energy storage capacitor 1 can eliminate the voltage fluctuation of the welding output, and the filter capacitor 13 can filter out the high-frequency noise signal of the alternating current. The energy storage capacitor 1 and the filter capacitor 13 cooperate with each other to ensure the stable operation of the circuit and improve the reliability and stability of the power control box.

[0037] In some embodiments, a plurality of the energy storage capacitors 1 are connected in parallel via at least two copper bars, and the withstand voltage of the energy storage capacitors 1 is ≥400V, and the capacitance is ≥1000μf. Figure 2 , Figure 3 and Figure 5 As shown, four energy storage capacitors 1 are provided, with a withstand voltage of 450V and a capacitance of 1000μf. The four energy storage capacitors 1 are connected in parallel through two copper busbars.

[0038] In some embodiments, the capacitance of the filter capacitor is ≤20 μf. Figure 2 , Figure 3 and Figure 5As shown, the capacitance of the filter capacitor 13 is 10 μf, the number is 2, and the connection mode with the energy storage capacitor 1 is parallel connection.

[0039] In some embodiments, Figure 1 and Figure 2 As shown, a heat dissipation unit is provided above the circuit mounting board 15 .

[0040] In this embodiment, in addition to the water cooling plate 6, a heat dissipation unit is also provided inside the power control box, for example, the heat dissipation unit may be a fan or a ventilation device, etc. The heat dissipation unit is provided above the circuit mounting plate 15, and together with the water cooling plate 6, a heat dissipation system with good heat dissipation effect can be formed at the upper and lower levels, thereby ensuring that the components inside the power control box can maintain good thermal stability when working, especially when working at high current.

[0041] In some embodiments, the heat dissipation unit includes a heat dissipation fan 7 , and the heat dissipation fan 7 is installed on a fan mounting plate 14 , and the fan mounting plate 14 is located above the weak current control unit 300 .

[0042] In this embodiment, if Figure 2 As shown, the heat dissipation unit adopts the method of heat dissipation fan 7. A fan mounting plate 14 is arranged above the weak current control unit 300 or the circuit control board 8, and the heat dissipation fan 7 is mounted on the fan mounting plate 14. When the heat dissipation fan 7 is running, the circuit control board 8 can be directly cooled. The heat dissipation fan 7 and the water cooling plate 6 are respectively arranged inside the power control box, and are divided into upper and lower layers to dissipate heat for the strong current working unit 300 and the weak current control unit 400, respectively, to form a heat dissipation system with good performance.

[0043] In some embodiments, Figure 2 , Figure 3 and Figure 5 As shown, the high-voltage working unit 300 includes an insulated gate bipolar transistor IGBT2, a current sensor 3, a protection resistor 4, and a rectifier 5, wherein the IGBT2, the protection resistor 4, and the rectifier 5 are connected in parallel with the capacitor unit 200, and the output end of the IGBT2 passes through the current sensor 3.

[0044] In this embodiment, the high-voltage working unit 300 in the power control box is mainly used to convert the input industrial three-phase AC power into stable DC power, and under the control of the low-voltage control unit 400, convert the DC power into a high-frequency AC output that meets the welding requirements. The output high-frequency AC power is connected to the transformer outside the power control box and converted into DC power again for use in the welding head.

[0045] Figure 6 The circuit structure diagram inside the power control box is shown as follows: Figure 6As shown, R, S, and T on the upper left side of the figure represent the input industrial three-phase power supply. Three rectifiers 5, capacitor unit 200, and eight IGBT2 are connected in parallel through solid lines, and the three-phase power supply, current sensor 3, and rectifier 5 output are respectively connected to the circuit control board 8 (weak current control unit) through solid lines, and the solid lines represent strong current connections. Rectifier 5, IGBT2, and protection resistor 4 are respectively connected to the circuit control board 8 through dotted lines, and the dotted lines represent weak current connections. Figure 6 The capacitor unit 200 shown in FIG. 1 is an energy storage capacitor 1. Figure 6 The filter capacitor 13 is not shown.

[0046] The rectifier 5 is mainly used to rectify the input industrial three-phase alternating current, and the filter capacitor 13 performs filtering on the three-phase alternating current to eliminate high-frequency noise signals. The rectifier 5 and the filter capacitor 13 work together to obtain a relatively stable DC power supply. IGBT2 is used to conduct and cut off at a frequency under the control of the weak current control unit 400, and convert the DC power into high-frequency AC power. At this time, according to the welding requirements, the IGBT2 can be controlled to generate AC currents of different waveforms by adjusting the parameters such as the output signal frequency and the conduction time of the weak current control unit 400. The protective resistor 4 is used to suppress the discharge current when the circuit is switched, so as to achieve the function of protecting the circuit. The current sensor 3 is used to convert the current value into a voltage signal or a digital signal, so as to facilitate the input to the circuit control board 8 for signal processing, and is used for the circuit control board 8 to detect current changes and ensure the stable operation of the power control box.

[0047] In this embodiment, a high-voltage working unit including IGBT, current sensor, protection resistor and rectifier is used to complete the power conversion of the high-voltage part of the power control box, and can provide a safe and stable output current under the control of the low-voltage control unit.

[0048] In some embodiments, there are two or more IGBTs and protection resistors, and they are symmetrically mounted on the water cooling plate in parallel. Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, Figure 6 The eight IGBTs 2 and two protection resistors 4 are symmetrically mounted on the water cooling plate 6 and connected in parallel. Figure 3 and Figure 5 Six IGBTs are shown in the figure. The utility model does not limit the number and installation position of various components such as IGBTs and protection resistors. The maximum output current capacity of IGBT is 800A. The circuit connection mode of parallel IGBTs and parallel energy storage capacitors can increase the threshold and stability of the maximum output current. The maximum output current in this embodiment is 2400A, and it can achieve ultra-large soldering current output by combining with a soldering transformer.

[0049] In some embodiments, at least three of the rectifiers are mounted on the water cooling plate in parallel with the IGBT and the protection resistor. Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, at least three of the rectifiers are installed side by side in parallel with the IGBT and the protective resistor on the water-cooled plate, and the three rectifiers 5 are installed symmetrically on the water-cooled plate 6. In addition to the side-by-side method, the above-mentioned rectifiers, IGBTs and protective resistors can also be installed on the water-cooled plate in a staggered installation or other manner. The utility model does not limit the installation arrangement of the above-mentioned components. Since IGBT2 and rectifier 5 are high-power heat source components, symmetrical installation on the water-cooled plate 6 can achieve an effective cooling effect, and reduce the influence of the interactive magnetic field generated by electromagnetic induction on the circuit, improve the stability of the internal circuit operation of the power control box, and achieve stable output of large current.

[0050] In some embodiments, the input end of the rectifier 5 is connected to a three-phase input copper plate 11, the output end of the IGBT 2 is connected to an output copper plate 12, the output copper plate 12 passes through the current sensor 3, the three-phase input copper plate 11 and the output copper plate 12 are connected from the wiring port below the protective housing 9, and the protection resistor 4 is installed on both sides of the water-cooled plate 6. In the utility model, the two protection resistors 4 are installed on both sides of the same surface of the water-cooled plate 6, and the utility model does not limit the specific location of their actual installation.

[0051] In some embodiments, the output end of the IGBT2 on any side is connected to the output copper plate 12 on the same side, and the control end of the IGBT2 is connected to the weak current control unit 400 .

[0052] In some embodiments, the positive output terminal of the rectifier 5 is connected to the positive input terminal of the IGBT2 via a positive connecting copper plate 17 , and the negative output terminal of the rectifier 5 is connected to the negative input terminal of the IGBT2 via a negative connecting copper plate 16 .

[0053] In some embodiments, the positive electrode connecting copper plate 17 and the negative electrode connecting copper plate 16 are arranged in upper and lower layers below the circuit mounting board 15 , the positive electrode connecting copper plate 17 is connected to the positive electrode of the capacitor unit 200 , and the negative electrode connecting copper plate 16 is connected to the negative electrode of the capacitor unit 200 .

[0054] like Figure 2 , Figure 3 and Figure 5As shown, in the above embodiment, the three-phase power supply is connected to the rectifier 5 and the IGBT2 by using copper plates instead of wires, which can reduce the connection resistance in the circuit, reduce the energy loss of the connection circuit, and achieve stable output of high-power current.

[0055] The three-phase input copper plate 11, output copper plate 12, negative electrode connection copper plate 16 and positive electrode connection copper plate 17 mentioned in the above embodiment can also be replaced by copper wire, copper bus or other materials with good conductivity, and the present invention does not limit this.

[0056] In some embodiments, the weak current control unit includes a circuit control board 8. In this embodiment, the control circuit is integrated on a circuit control board 8, which simplifies the circuit connection. Most electrical fault problems can be eliminated by simply replacing the circuit control board 8, and contact failures and signal interference of the connecting wires on the circuit control board 8 are avoided, thereby improving the accuracy and reliability of the output current of the power control box.

[0057] In some embodiments, a switch 10 and an emergency stop button are provided on the door of the protective housing 9. Figure 4 As shown, it is convenient to use or perform emergency braking.

[0058] The working principle of the utility model is:

[0059] The industrial three-phase AC power is connected to the three-phase input copper plate 11 through the wiring port under the protective shell 9, and the three-phase AC power is rectified and filtered by the rectifier 5 and the filter capacitor 13 to obtain a relatively stable DC power supply; then the frequency conduction and cutoff of the IGBT2 on the left and right sides are controlled by the circuit control board 8 to convert the DC power supply into a high-frequency AC power supply. At this time, the output signal frequency and conduction time parameters can be adjusted by the circuit control board 8 according to the welding requirements to generate AC currents of different waveforms. The obtained AC current is output through the output copper plate 12 and connected to the transformer ( Figure 6 The primary winding side of the medium frequency transformer is shown in the figure. After passing through the secondary winding of the transformer, it is converted into direct current and can be used for the welding head.

[0060] The utility model adopts three-phase power supply balanced input, high power factor, energy saving and consumption reduction, and can reduce the impact on the power grid. The internal components of the utility model are arranged symmetrically and will not be affected by the current peak and the alternating magnetic field. By combining with different AC soldering transformers, it can meet different soldering process requirements, and the frequency conversion range is: 1KHz ~ 10KHz.

[0061] In the above embodiments, the description of each embodiment has its own emphasis. For the part not described in detail in a certain embodiment, please refer to the relevant description of other embodiments. The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation on the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the claims attached to the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the attached claims, or the equivalent forms of such scope and boundaries.

Claims

1. A medium frequency inverter soldering power supply control box, characterized in that: Including protective housing, A mounting bracket is provided on one side of the protective shell, and a capacitor unit is installed on the mounting bracket; a water cooling plate is provided on the other side of the protective shell close to the shell, and a high-voltage working unit and a circuit installation plate are installed on the water cooling plate, and the circuit installation plate and the high-voltage working unit are installed in layers above and below; a low-voltage control unit is installed on the circuit installation plate.

2. The medium frequency inverter soldering power supply control box according to claim 1 is characterized in that: It also includes a heat dissipation unit for cooling the weak current control unit.

3. The medium frequency inverter soldering power supply control box according to claim 1 is characterized in that: The capacitor unit includes a storage capacitor and a filter capacitor connected in parallel.

4. The medium frequency inverter soldering power supply control box according to claim 3 is characterized in that: A plurality of the energy storage capacitors are connected in parallel via at least two copper bars, and the withstand voltage of the energy storage capacitors is ≥400V, and the capacitance is ≥1000μf.

5. The medium frequency inverter soldering power supply control box according to claim 3 or 4, characterized in that: The capacitance of the filter capacitor is ≤20 μf.

6. The medium frequency inverter soldering power supply control box according to claim 1, characterized in that: The high-voltage working unit comprises an insulated gate bipolar transistor (IGBT), a current sensor, a protection resistor, and a rectifier, wherein the IGBT, the protection resistor, and the rectifier are connected in parallel with the capacitor unit, and the output end of the IGBT passes through the current sensor.

7. The medium frequency inverter soldering power supply control box according to claim 6, characterized in that: There are two or more IGBTs and protection resistors, and they are symmetrically installed on the water cooling plate in parallel.

8. The medium frequency inverter soldering power supply control box according to claim 6, characterized in that: At least three of the rectifiers are installed on the water cooling plate in parallel with the IGBT and the protection resistor.

9. The medium frequency inverter soldering power supply control box according to claim 6, characterized in that: The input end of the rectifier is connected to a three-phase input copper plate, the output end of the IGBT is connected to an output copper plate, the output copper plate passes through the current sensor, the three-phase input copper plate and the output copper plate are connected from the wiring port below the protective shell, and the protection resistor is installed on both sides of the water cooling plate.

10. The medium frequency inverter soldering power supply control box according to claim 9, characterized in that: The output end of the IGBT on either side is connected to the output copper plate on the same side, and the control end of the IGBT is connected to the weak current control unit.

11. The medium frequency inverter soldering power supply control box according to claim 10, characterized in that: The positive output terminal of the rectifier is connected to the positive input terminal of the IGBT via a positive connection copper plate, and the negative output terminal of the rectifier is connected to the negative input terminal of the IGBT via a negative connection copper plate.

12. The medium frequency inverter soldering power supply control box according to claim 11, characterized in that: The positive electrode connecting copper plate and the negative electrode connecting copper plate are arranged in layers below the circuit mounting plate, the positive electrode connecting copper plate is connected to the positive electrode of the capacitor unit, and the negative electrode connecting copper plate is connected to the negative electrode of the capacitor unit.

13. The medium frequency inverter soldering power supply control box according to claim 1, characterized in that: The weak current control unit includes a circuit control board.

14. The medium frequency inverter soldering power supply control box according to claim 2, characterized in that: The heat dissipation unit comprises a heat dissipation fan, and the heat dissipation fan is mounted on a fan mounting plate, and the fan mounting plate is located above the weak current control unit.

15. The medium frequency inverter soldering power supply control box according to claim 2, characterized in that: A switch and an emergency stop button are arranged on the door of the protective shell.

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