Intermediate frequency welding controller

Abstract

The utility model provides an intermediate frequency welding controller which comprises a control module, an IGBT driving module, a first current collecting module, a second current collecting module and a voltage collecting module, the input end of the IGBT driving module is electrically connected with the output end of the control module, and the control module outputs control current to welding tongs through the IGBT driving module; the output end of the first current acquisition module is electrically connected with the input end of the control module, and the first current acquisition module is used for acquiring control current and transmitting an acquisition value to the control module; the output ends of the second current acquisition module and the voltage acquisition module are electrically connected with the input end of the control module, the second current acquisition module is used for acquiring control current, the voltage acquisition module is used for acquiring voltage fed back by the electrode holder, the controller can acquire the voltage and the current fed back by the electrode holder in real time, and then the system can control the electrode holder according to the voltage and the current. The state and the welding quality of the welding spot are judged, the output current is adjusted in real time, and the welding quality is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to a medium frequency welding controller. Background Art

[0002] The medium frequency welding controller is a device specially used for welding process. Its core technology is to use medium frequency current to generate magnetic field and realize welding through the effect of magnetic field on metal workpiece.

[0003] An intelligent welding control system and method with publication number CN109202250A includes a logic control module connected to a power drive and a controller, an AC power supply connected to an input end of a full-bridge rectifier circuit, a power drive connected between the AC power supply and an inverter circuit unit, an output end of the full-bridge rectifier circuit connected to an input end of a DC circuit, an output end of the DC circuit connected to an input end of an inverter circuit unit, an output end of the inverter circuit unit connected to an input end of a medium frequency welding transformer, an output end of the medium frequency welding transformer connected to a current rectifier unit, and an output end of the current rectifier unit connected to a welding clamp device.

[0004] However, the existing welding control system does not have the function of collecting the current and voltage output by the controller, resulting in the system being unable to test the resistance of the welding plate based on the voltage and current, and to determine the state of the welding point and the welding quality, thereby reducing the welding quality. Utility Model Content

[0005] In view of this, the utility model proposes a medium frequency welding controller, which can collect the voltage and current fed back from the welding clamp in real time. Then the system can judge the state of the welding point and the welding quality according to the voltage and current, and adjust the output current in real time, thereby effectively improving the welding quality.

[0006] The technical solution of the utility model is implemented as follows: The utility model provides a medium frequency welding controller, including a control module, an IGBT drive module, a first current acquisition module, a second current acquisition module and a voltage acquisition module, wherein:

[0007] The input end of the IGBT driving module is electrically connected to the output end of the control module, and the control module outputs a control current to the welding clamp through the IGBT driving module;

[0008] The output end of the first current acquisition module is electrically connected to the input end of the control module, and is used to acquire the control current and transmit the acquired value to the control module;

[0009] The output ends of the second current acquisition module and the voltage acquisition module are both electrically connected to the input end of the control module, the second current acquisition module is used to acquire the control current, and the voltage acquisition module is used to acquire the voltage fed back by the welding clamp, and transmit the acquired control current and the acquired voltage fed back by the welding clamp to the control module;

[0010] The control module outputs a corresponding regulating current according to the collected control current and the collected voltage feedback from the welding clamp.

[0011] On the basis of the above technical scheme, preferably, the IGBT driving module includes a voltage-stabilizing diode D17, a resistor R12, a resistor R23, a chip U7, a resistor R24, a capacitor C35, a diode D19, a capacitor C34, a capacitor C33, a resistor R25, a resistor R28, a resistor R22, a transistor Q3, a transistor Q2, a resistor R29, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a capacitor C45, a bidirectional trigger diode D20 and a driving chip M1, wherein the cathode of the voltage-stabilizing diode D17 is electrically connected to the input end of the control module, and the voltage-stabilizing diode D17 is electrically connected to the input end of the control module. The positive pole of the chip U7 is electrically connected to the resistor R23 and the resistor R12 respectively. The chip U7 has 16 pins. The other end of the resistor R23 is electrically connected to the pin 7 and pin 6 of the chip U7 respectively. The other end of the resistor R12 is electrically connected to the pin 8 and pin 5 of the chip U7 respectively. Pin 1 and pin 4 of the chip U7 are grounded. Pin 2 of the chip U7 is connected to the power supply. Pin 3 of the chip U7 is electrically connected to one end of the resistor R24. The other end of the resistor R24 ​​is electrically connected to the power supply. Pin 16 of the chip U7 is electrically connected to the positive pole of the capacitor C33, the capacitor C34 and the diode D19 respectively. The other end of the capacitor C34 The cathode of the diode D19 is electrically connected to the pin 14 of the chip U7, the other end of the capacitor C33 and the pin 13 of the chip U7 are electrically connected to the collector of the transistor Q3, the pin 11 of the chip U7 is electrically connected to one end of the resistor R25, the other end of the resistor R25 is electrically connected to the resistor R28, the base of the transistor Q3, the base of the transistor Q2, and one end of the resistor R22, the pin 10 of the chip U7 is electrically connected to the other end of the resistor R28 and the collector of the transistor Q2, the other end of the resistor R22 is electrically connected to the emitter of the transistor Q2, the resistor R31 and the first end of the resistor R32 The common end is electrically connected, the emitter of the transistor Q3 is electrically connected to the first common end of the resistor R29 and the resistor R30 respectively, the second common end of the resistor R29 and the resistor R30 is electrically connected to the first input end of the driving chip M1 and the second common end of the resistor R31 and the resistor R32 respectively, the second common end of R31 and the resistor R32 is electrically connected to the bidirectional trigger diode D20, the resistor R33 and the capacitor C45 respectively, the other end of the bidirectional trigger diode D20, the resistor R33 and the capacitor C45 is electrically connected to the second input end of the driving chip M1, and the output end of the driving chip M1 is electrically connected to the welding clamp device.

[0012] On the basis of the above technical scheme, preferably, it also includes an amplification circuit, which includes an input power supply, a resistor R493, a capacitor C138, a resistor R494, a resistor R103, a capacitor C40 and an operational amplifier U26-A, wherein one end of the resistor R493 is electrically connected to the input power supply, the other end of the resistor R493 is electrically connected to the capacitor C138, the resistor R494 and the in-phase input terminal of the operational amplifier U26-A respectively, the other ends of the capacitor C138 and the resistor R494 are both electrically connected to the resistor R103, the other end of the resistor R103 is electrically connected to the capacitor C40, the other end of the capacitor C40 is electrically connected to the inverting input terminal of the operational amplifier U26-A and are both electrically connected to the output terminal of the operational amplifier U26-A.

[0013] On the basis of the above technical scheme, preferably, the first current acquisition module includes terminal row J20, resistor R90, resistor R64, resistor R87, resistor R88, resistor R89, operational amplifier U26-B, resistor R91, resistor R477, resistor R99, capacitor C37, capacitor C194, capacitor C125 and diode D74, wherein the terminal row J20 is connected to the external Hall sensor cell, the input end of the terminal row J20 is electrically connected to one end of the resistor R90, resistor R64 and resistor R88, the other end of the resistor R88 is electrically connected to the resistor R89 ​​and the in-phase input end of the operational amplifier U26-B respectively, and the other end of the resistor R89 ​​is electrically connected to the output end of the operational amplifier U26-A. The other ends of resistor R90 and resistor R64 are electrically connected to resistor R87 and grounded, the other ends of resistor R87 are electrically connected to the inverting input terminal of operational amplifier U26-B, resistor R91 and capacitor C37 respectively, the other ends of resistor R91 and capacitor C37 are electrically connected to the output terminal of operational amplifier U26-B and resistor R477, the other ends of resistor R477 are electrically connected to capacitor C194 and resistor R99 respectively, the other end of resistor R99 is electrically connected to capacitor C125, the first end of diode D74 and the input terminal of the control module respectively, the other end of capacitor C125 is electrically connected to the second end of diode D74 and grounded, and the third end of diode D74 is connected to the power supply.

[0014] On the basis of the above technical scheme, preferably, the voltage acquisition module includes an end row J2, a voltage transformer L8, a bidirectional trigger diode D38, a bidirectional trigger diode D37, a resistor R182, a capacitor C64, a capacitor C80, a resistor R147, a resistor R144, a resistor R146, a resistor R184, a resistor R186, an operational amplifier U25-A, a resistor R8, a resistor R9, a capacitor C5, a capacitor C41 and a diode D2, wherein one end of the primary winding terminal and the secondary winding terminal of the voltage transformer L8 are electrically connected to the end row J2, the other end of the primary winding terminal of the voltage transformer L8 is electrically connected to the bidirectional trigger diode D38, the capacitor C80, the resistor R147 and the resistor R144 respectively, the other end of the secondary winding terminal of the voltage transformer L8 is electrically connected to the bidirectional trigger diode D37, the resistor R182, the capacitor C64 and the resistor R146 respectively, the bidirectional trigger diode D38 is electrically connected to the bidirectional trigger diode D38, the capacitor C80, the resistor R147 and the resistor R144 respectively, the The other end of the diode D37 is grounded, the other ends of the resistor R182, the capacitor C64, the capacitor C80 and the resistor R147 are commonly grounded, the other end of the resistor R144 is electrically connected to the resistor R186 and the inverting input terminal of the operational amplifier U25-A respectively, the other end of the resistor R146 is electrically connected to the non-inverting input terminal of the operational amplifier U25-A and the resistor R184 respectively, the other end of the resistor R184 is electrically connected to the output terminal of the operational amplifier U26-A, the other end of the resistor R186 is electrically connected to the output terminal of the operational amplifier U25-A and the resistor R8 respectively, the other end of the resistor R8 is electrically connected to the capacitor C5 and the resistor R9 respectively, the other end of the capacitor C5 is grounded, the other end of the resistor R9 is electrically connected to the capacitor C41, the first end of the diode D2 and the input terminal of the control module respectively, the other end of the capacitor C41 is electrically connected to the second end of the diode D2 and grounded, and the third end of the diode D2 is connected to the power supply.

[0015] On the basis of the above technical scheme, preferably, the second current acquisition module includes a voltage transformer L6, a resistor R161, a resistor R181, a resistor R4, a bidirectional trigger diode D27, a bidirectional trigger diode D26, a resistor R69, a capacitor C4, a capacitor C32, a resistor R6, a resistor R95, a resistor R104, a resistor R106, an operational amplifier U17-A, a resistor R96, a resistor R187, a resistor R116, a MOS tube Q1, a MOS tube Q2, a resistor R108, a resistor R291, a resistor R142, a diode D34, a diode D28, a resistor R119, a resistor R120, a resistor R122, a resistor R123, a resistor R110, a resistor R115 ... Amplifier U17-B, capacitor C36, capacitor C38, resistor R13, capacitor C122, resistor R14, capacitor C128, diode D5, resistor R246, capacitor C139, resistor R247, capacitor C140, diode D50, resistor R271, MOS tube Q3, resistor R248, resistor 249, analog multiplexer U20, wherein one end of the primary winding terminal and the secondary winding terminal of the voltage transformer L6 are electrically connected to the terminal row J2, the other end of the primary winding terminal of the voltage transformer L6 is electrically connected to the resistor R161, the other end of the secondary winding terminal of the voltage transformer L6 is electrically connected to the resistor R181, and the other end of the resistor R161 is electrically connected to the bidirectional trigger diode The diode D27, the resistor R4, the capacitor C32, the resistor R6 and one end of the resistor R95 are electrically connected, the other end of the resistor R181 is electrically connected to the other end of the resistor R4, the bidirectional trigger diode D26, the resistor R69, the capacitor C4 and the resistor R104, the other end of the bidirectional trigger diode D27 and the other end of the bidirectional trigger diode D26 are commonly grounded, the other end of the resistor R69, the capacitor C4 and the capacitor C32 are commonly grounded, the other end of the resistor R6 is electrically connected to the resistor R271 and the drain of the MOS tube Q3, the other end of the resistor R271 is connected to the power supply, the gate of the MOS tube Q3 is electrically connected to the resistor R249 and the resistor R248 respectively, and the other end of the resistor R249 is electrically connected to the output end of the control module. The other end of the resistor R248 is electrically connected to the source of the MOS tube Q3, the other end of the resistor R95 is electrically connected to the resistor R106 and the inverting input terminal of the operational amplifier U17-A, the other end of the resistor R104 is electrically connected to the non-inverting input terminal of the operational amplifier U17-A and the resistor R96, the other end of the resistor R106 is electrically connected to the resistor R119, the resistor R120, the resistor R122, the resistor R123 and the resistor R246, the other ends of the resistors R119, R120, R122 and R123 are all electrically connected to the input terminal of the multiplexer U20, the other end of the resistor R246 is electrically connected to the resistor R247 and the capacitor C139, respectively.The other end of the resistor R247 is electrically connected to the first end of the capacitor C140, the diode D50 and the input end of the control module respectively. The other end of the capacitor C140 and the second end of the diode D50 are commonly grounded. The third end of the diode D50 is connected to the power supply. The other end of the resistor R96 is electrically connected to the resistor R187. The other end of the resistor R187 is electrically connected to the drain of the MOS tube Q1 and the resistor R116 respectively. The source of the MOS tube Q1 is electrically connected to the resistor R291 and the source of the MOS tube Q2 respectively. The gate of the MOS tube Q1 and the gate of the MOS tube Q2 are commonly connected to the resistor R142. The other end of the resistor R142 is electrically connected to the negative electrode of the diode D34 and the negative electrode of the diode D28 respectively. The positive electrodes of the diode D34 and the diode D28 are both electrically connected to the input end of the multiplexer U20. The other end of the resistor R116 is electrically connected to the gate of the MOS tube Q2. and resistor R108, the other end of resistor R108 is electrically connected to resistor R13, the input end of operational amplifier U17-B, capacitor C36 and one end of capacitor C38 respectively, the in-phase input end of operational amplifier U17-B is electrically connected to resistor R115, the other end of resistor R115 is grounded, the inverting input end of operational amplifier U17-B, the other end of capacitor C36 and capacitor C38 are commonly connected to one end of resistor R110, the other end of resistor R110 is electrically connected to the output end of multiplexer U20, the other end of resistor R13 is electrically connected to capacitor C122 and resistor R14 respectively, the other end of resistor R14 is electrically connected to capacitor C128, the first end of diode D5 and the input end of control module respectively, the other end of capacitor C128 is electrically connected to the second end of diode D5 and grounded, and the third end of diode D5 is connected to power supply. ,

[0016] On the basis of the above technical solution, preferably, the second current acquisition module also includes a buffer unit, which includes a resistor R210, a resistor R256 and a capacitor C35, wherein the resistor R210 is electrically connected to the positive terminal of the power input of the end row J2, the resistor R256 is electrically connected to the negative terminal of the power input of the end row J2, the other ends of the resistor R210 and the resistor R256 are electrically connected to the other ends of the capacitor C35 and the resistor R96 respectively, and the other end of the capacitor C35 is grounded.

[0017] On the basis of the above technical solution, preferably, the diode D74, the diode D2, the diode D50 and the diode D5 are all of model BAT54S.

[0018] On the basis of the above technical solution, preferably, the power input to the amplifier circuit is 2.5V.

[0019] On the basis of the above technical solution, preferably, the chip model of the control module is STM32F407IGT6 / LQFP176.

[0020] The medium frequency welding controller of the utility model has the following beneficial effects compared with the prior art:

[0021] (1) The control module is set to control the IGBT drive module to output a control current to the welding clamp. The first current acquisition module, the second current acquisition module and the voltage acquisition module collect the control current and the voltage fed back by the welding clamp, and transmit them to the control module. The control module outputs the corresponding adjustment current value according to the collected control current and the collected voltage fed back by the welding clamp, and re-controls the IGBT drive module to output the adjusted current to the welding clamp. The intermediate frequency welding controller can collect the voltage and current fed back from the welding clamp in real time, and then the system can judge the state of the welding point and the welding quality according to the voltage and current, and adjust the output current in real time, effectively improving the welding quality;

[0022] (2) The first current acquisition module and the second current acquisition module can both acquire the current value fed back from the welding clamp, and the controller can compare the current value acquired by the first current acquisition module with the current value acquired by the second current acquisition module, thereby effectively monitoring the operating status of the welding clamp and the acquisition module;

[0023] (3) The buffer unit can prevent the circuit from being broken down due to excessive current, thus achieving a protective effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a flow chart of the medium frequency welding controller of the utility model;

[0026] Figure 2 This is a circuit diagram of a control module of a medium frequency welding controller of the utility model;

[0027] Figure 3 This is a circuit diagram of an IGBT drive module of a medium frequency welding controller of the utility model;

[0028] Figure 4 This is the circuit diagram of the driving chip M1 of the medium frequency welding controller of the utility model;

[0029] Figure 5 This is a circuit diagram of a transformer unit of an IGBT drive module of a medium frequency welding controller of the utility model;

[0030] Figure 6 It is an oscillation drive circuit of the IGBT drive module of the medium frequency welding controller of the utility model;

[0031] Figure 7 This is the circuit diagram of the terminal row J2 of the medium frequency welding controller of the utility model;

[0032] Figure 8 This is the circuit diagram of the voltage acquisition module of the medium frequency welding controller of the utility model;

[0033] Fig. 9 This is a circuit diagram of the second current acquisition module of the medium frequency welding controller of the utility model;

[0034] Fig.10 This is the circuit diagram of the analog multiplexer U20 of the medium frequency welding controller of the utility model;

[0035] Fig.11 This is a circuit diagram of a buffer unit of a medium frequency welding controller of the utility model;

[0036] Fig.12 This is the circuit diagram of the terminal row J20 of the medium frequency welding controller of the utility model;

[0037] Fig.13 It is a circuit diagram of the amplifier circuit of the medium frequency welding controller of the utility model;

[0038] Fig.14 This is a circuit diagram of the first current acquisition module of the medium frequency welding controller of the utility model. DETAILED DESCRIPTION

[0039] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] like Figure 1As shown, a medium frequency welding controller of the utility model includes a control module 1, an IGBT driving module 2, a first current acquisition module 3, a second current acquisition module 4 and a voltage acquisition module 5, wherein the input end of the IGBT driving module 2 is electrically connected to the output end of the control module 1, and the control module 1 outputs a control current to the welding clamp through the IGBT driving module 2; the output end of the first current acquisition module 3 is electrically connected to the input end of the control module 1, and is used to acquire the control current, and transmit the acquired value to the control module 1; the output ends of the second current acquisition module 4 and the voltage acquisition module 5 are both electrically connected to the input end of the control module 1, the second current acquisition module 4 is used to acquire the control current, and the voltage acquisition module 5 is used to acquire the voltage fed back by the welding clamp, and the acquired control current and the collected voltage fed back by the welding clamp are transmitted to the control module 1; the control module 1 outputs the corresponding adjustment current according to the acquired control current and the collected voltage fed back by the welding clamp.

[0041] According to the control module 1 set in this embodiment, the IGBT driving module 2 is controlled to output a control current to the welding clamp, the first current acquisition module 3 and the second current acquisition module 4 both acquire the control current output to the welding clamp, the voltage acquisition module 5 acquires the voltage fed back by the welding clamp, and the acquired output control current and voltage are transmitted to the control module 1. The control module 1 determines the magnitude of the control current values ​​acquired by the first current acquisition module 3 and the second current acquisition module 4. If the difference between the two control current values ​​is within the allowable range, the current value fed back by the second current acquisition module 4 is used as the acquisition value, and the control module 1 calculates the resistance according to the current value fed back by the second current acquisition module 4 and the voltage value fed back by the welding clamp acquired by the voltage acquisition module 5. The state of the welding spot and the welding quality can be judged according to the resistance. If the detection resistance does not meet the requirements, the control module 1 adjusts the control output current value and re-controls the IGBT driving module to output the adjusted current to the welding clamp, so that the intermediate frequency welding controller can collect the voltage and current fed back from the welding clamp in real time, and can judge the state of the welding spot and the welding quality according to the voltage and current, adjust the output current in real time, and effectively improve the welding quality.

[0042] like Figure 3-4As shown, the IGBT driving module 2 in this embodiment includes a voltage-stabilizing diode D17, a resistor R12, a resistor R23, a chip U7, a resistor R24, a capacitor C35, a diode D19, a capacitor C34, a capacitor C33, a resistor R25, a resistor R28, a resistor R22, a transistor Q3, a transistor Q2, a resistor R29, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a capacitor C45, a bidirectional trigger diode D20 and a driving chip M1, wherein the cathode of the voltage-stabilizing diode D17 is electrically connected to the input end of the control module 1, and the anode of the voltage-stabilizing diode D17 is electrically connected to the input end of the control module 1, and ... The chip U7 is electrically connected to the resistor R23 and the resistor R12. The chip U7 has 16 pins. The other end of the resistor R23 is electrically connected to the pin 7 and pin 6 of the chip U7 respectively. The other end of the resistor R12 is electrically connected to the pin 8 and pin 5 of the chip U7 respectively. The pin 1 and pin 4 of the chip U7 are grounded. The pin 2 of the chip U7 is connected to the power supply. The pin 3 of the chip U7 is electrically connected to one end of the resistor R24. The other end of the resistor R24 ​​is electrically connected to the power supply. The pin 16 of the chip U7 is electrically connected to the positive electrode of the capacitor C33, the capacitor C34 and the diode D19 respectively. The other end of the capacitor C34 is electrically connected to the diode D19. The negative electrode of transistor D19 is electrically connected to pin 14 of chip U7, the other end of capacitor C33 and pin 13 of chip U7 are electrically connected to the collector of transistor Q3, pin 11 of chip U7 is electrically connected to one end of resistor R25, the other end of resistor R25 is electrically connected to resistor R28, the base of transistor Q3, the base of transistor Q2, and one end of resistor R22, pin 10 of chip U7 is electrically connected to the other end of resistor R28 and the collector of transistor Q2, the other end of resistor R22 is electrically connected to the emitter of transistor Q2, resistor R31 and the first common terminal of resistor R32, respectively. The ends are electrically connected, the emitter of the transistor Q3 is electrically connected to the first common end of the resistor R29 and the resistor R30, the second common end of the resistor R29 and the resistor R30 is electrically connected to the first input end of the driving chip M1 and the second common end of the resistor R31 and the resistor R32, the second common end of R31 and the resistor R32 is electrically connected to the bidirectional trigger diode D20, the resistor R33 and the capacitor C45, the other ends of the bidirectional trigger diode D20, the resistor R33 and the capacitor C45 are electrically connected to the second input end of the driving chip M1, and the output end of the driving chip M1 is electrically connected to the welding clamp device.

[0043] It should be noted that if Figure 5-6As shown, the IGBT drive module 2 also includes a transformer unit, which includes a coil A1, a coil A2, a coil A3, a diode D9, a diode D11, a diode D12, a diode D14, a diode D10, a diode D13, a diode D15, a diode D16, a capacitor C25, a capacitor C5, a capacitor C26, a capacitor C19 and an oscillation drive circuit, wherein one end of the coil A1 is electrically connected to the output end of the oscillation drive circuit, and the other end is grounded, one end of the coil A2 is electrically connected to the positive electrode of the diode D9 and the negative electrode of the diode D11, respectively, the other end of the coil A2 is electrically connected to the positive electrode of the diode D12 and the negative electrode of the diode D14, respectively, the negative electrode of the diode D9 is electrically connected to the negative electrode of the diode D12, the positive electrode of the capacitor C25, the positive electrode of the capacitor C5 and the pin 13 of the chip U7, the pins 12, 10 and 9 of the chip U7 are electrically connected to the capacitor C35, and the pin 14 of the chip U7 is electrically connected to the resistor R26. The other end of the resistor R26 is electrically connected to the voltage-stabilizing diode D18; the anode of the diode D14 is electrically connected to the anode of the diode D14, the cathode of the capacitor C25, the cathode of the capacitor C5, the anode of the capacitor C19 and the pin 16 of the chip U7, the other end of the capacitor C35, the other end of the voltage-stabilizing diode D18 and the other end of the resistor R33; one end of the coil A3 is electrically connected to the anode of the diode D10 and the cathode of the diode D13, the other end of the coil A3 is electrically connected to the anode of the diode D15 and the cathode of the diode D16, the cathode of the diode D10 is electrically connected to the cathode of the diode D15, the cathode of the capacitor C26 and the cathode of the capacitor C19, the anode of the diode D13 is electrically connected to the anode of the diode D16, the cathode of the capacitor C26, the cathode of the capacitor C19 and the pin 10 of the chip U7;

[0044] The oscillation driving circuit includes a chip U1, a resistor R2, a capacitor C6, a capacitor C2, a capacitor C1, a resistor R47, a capacitor C7, a diode D30, a capacitor C8, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a MOS tube D1, a MOS tube D2, a capacitor C9, a capacitor C10, a capacitor C11, a transistor Q1, a resistor R9, a high-frequency switch diode U4-A, a resistor R8, a capacitor C16, a capacitor C15 and a diode D3, wherein pin 1 of the chip U1 is electrically connected to the positive electrode of the resistor R47, the capacitor C7 and the diode D30 respectively, the other end of the capacitor C7 is grounded, the negative electrode of the diode D30 is electrically connected to pin 8 of the chip U1 and the capacitor C8 respectively, the other end of the resistor R47 is electrically connected to the external 15V power supply, the capacitor C22 and the capacitor C1 respectively, Pin 2 of chip U1 is electrically connected to resistor R2, and the other end of resistor R2 is electrically connected to pin 3 of chip U1, capacitor C6 and the collector of transistor Q1 respectively, the other end of capacitor C6 is commonly grounded with pin 4 of chip U1, capacitor C2 and the other end of capacitor C1, the emitter of transistor Q1 is grounded, the base of transistor Q1 is electrically connected to resistor R9, the other end of resistor R9 is electrically connected to the negative electrode of high-frequency switching diode U4-A, the positive electrode of high-frequency switching diode U4-A is electrically connected to diode D3, resistor R8 and capacitor C16 respectively, the other end of capacitor C16 is grounded, the other end of diode D3 and the other end of resistor R8 are commonly connected to a 5V power supply and capacitor C15 respectively, and the other end of capacitor C15 is grounded; the oscillation drive circuit is used to drive the control voltage output.

[0045] Specifically, the model of the chip U1 in this embodiment is IC / IRS2153DSTRPBF / SO-8, and the model of the driver chip M1 is FF600R12ME4_B72.

[0046] like Fig.13 As shown, the present embodiment also includes an amplifier circuit, which includes an input power supply, a resistor R493, a capacitor C138, a resistor R494, a resistor R103, a capacitor C40 and an operational amplifier U26-A, wherein one end of the resistor R493 is electrically connected to the input power supply, the other end of the resistor R493 is electrically connected to the capacitor C138, the resistor R494 and the in-phase input terminal of the operational amplifier U26-A respectively, the other ends of the capacitor C138 and the resistor R494 are both electrically connected to the resistor R103, the other end of the resistor R103 is electrically connected to the capacitor C40, the other end of the capacitor C40 is electrically connected to the inverting input terminal of the operational amplifier U26-A and are both electrically connected to the output terminal of the operational amplifier U26-A.

[0047] like Fig.12 and Fig.14As shown, the first current acquisition module 3 in this embodiment includes an end row J20, a resistor R90, a resistor R64, a resistor R87, a resistor R88, a resistor R89, an operational amplifier U26-B, a resistor R91, a resistor R477, a resistor R99, a capacitor C37, a capacitor C194, a capacitor C125 and a diode D74, wherein the end row J20 is connected to an external Hall sensor cell, an input end of the end row J20 is electrically connected to one end of the resistor R90, the resistor R64 and the resistor R88, the other end of the resistor R88 is electrically connected to the resistor R89 ​​and the in-phase input end of the operational amplifier U26-B respectively, the other end of the resistor R89 ​​is electrically connected to the output end of the operational amplifier U26-A, and the The other ends of resistor R90 and resistor R64 are electrically connected to resistor R87 and grounded. The other ends of resistor R87 are electrically connected to the inverting input terminal of operational amplifier U26-B, resistor R91 and capacitor C37 respectively. The other ends of resistor R91 and capacitor C37 are electrically connected to the output terminal of operational amplifier U26-B and resistor R477 respectively. The other ends of resistor R477 are electrically connected to capacitor C194 and resistor R99 respectively. The other end of resistor R99 is electrically connected to capacitor C125, the first end of diode D74 and the input terminal of control module 1 respectively. The other end of capacitor C125 is electrically connected to the second end of diode D74 and grounded. The third end of diode D74 is connected to the power supply.

[0048] Specifically, the input power supply in the amplifier circuit in this embodiment is 2.5V, and the models of the operational amplifier U26-A and the operational amplifier U26-B are LM358AD.

[0049] like Figure 7-8As shown, the voltage acquisition module 5 in this embodiment includes an end row J2, a voltage transformer L8, a bidirectional trigger diode D38, a bidirectional trigger diode D37, a resistor R182, a capacitor C64, a capacitor C80, a resistor R147, a resistor R144, a resistor R146, a resistor R184, a resistor R186, an operational amplifier U25-A, a resistor R8, a resistor R9, a capacitor C5, a capacitor C41 and a diode D2, wherein one end of the primary winding terminal and the secondary winding terminal of the voltage transformer L8 are electrically connected to the end row J2, the other end of the primary winding terminal of the voltage transformer L8 is electrically connected to the bidirectional trigger diode D38, the capacitor C80, the resistor R147 and the resistor R144 respectively, the other end of the secondary winding terminal of the voltage transformer L8 is electrically connected to the bidirectional trigger diode D37, the resistor R182, the capacitor C64 and the resistor R146 respectively, the bidirectional trigger diode D38 is electrically connected to the bidirectional trigger diode D The other end of 37 is grounded, the other ends of resistor R182, capacitor C64, capacitor C80 and resistor R147 are commonly grounded, the other end of resistor R144 is electrically connected to resistor R186 and the inverting input terminal of operational amplifier U25-A respectively, the other end of resistor R146 is electrically connected to the non-inverting input terminal of operational amplifier U25-A and resistor R184 respectively, the other end of resistor R184 is electrically connected to the output terminal of operational amplifier U26-A, the other end of resistor R186 is electrically connected to the output terminal of operational amplifier U25-A and resistor R8 respectively, the other end of resistor R8 is electrically connected to capacitor C5 and resistor R9 respectively, the other end of capacitor C5 is grounded, the other end of resistor R9 is electrically connected to capacitor C41, the first end of diode D2 and the input terminal of control module 1 respectively, the other end of capacitor C41 is electrically connected to the second end of diode D2 and grounded, and the third end of diode D2 is connected to the power supply.

[0050] like Figure 9-10As shown, the second current acquisition module 4 in this embodiment includes a voltage transformer L6, a resistor R161, a resistor R181, a resistor R4, a bidirectional trigger diode D27, a bidirectional trigger diode D26, a resistor R69, a capacitor C4, a capacitor C32, a resistor R6, a resistor R95, a resistor R104, a resistor R106, an operational amplifier U17-A, a resistor R96, a resistor R187, a resistor R116, a MOS tube Q1, a MOS tube Q2, a resistor R108, a resistor R291, a resistor R142, a diode D34, a diode D28, a resistor R119, a resistor R120, a resistor R122, a resistor R123, a resistor R110, a resistor R115, and an operational amplifier U17 -B, capacitor C36, capacitor C38, resistor R13, capacitor C122, resistor R14, capacitor C128, diode D5, resistor R246, capacitor C139, resistor R247, capacitor C140, diode D50, resistor R271, MOS tube Q3, resistor R248, resistor 249, analog multiplexer U20, wherein one end of the primary winding terminal and the secondary winding terminal of the voltage transformer L6 are electrically connected to the terminal row J2, the other end of the primary winding terminal of the voltage transformer L6 is electrically connected to the resistor R161, the other end of the secondary winding terminal of the voltage transformer L6 is electrically connected to the resistor R181, and the other end of the resistor R161 is electrically connected to the bidirectional trigger diode D271. , resistor R4, capacitor C32, resistor R6 and one end of resistor R95 are electrically connected, the other end of resistor R181 is electrically connected to the other end of resistor R4, bidirectional trigger diode D26, resistor R69, capacitor C4 and resistor R104, the other end of bidirectional trigger diode D27 and the other end of bidirectional trigger diode D26 are commonly grounded, the other end of resistor R69, capacitor C4 and capacitor C32 are commonly grounded, the other end of resistor R6 is electrically connected to resistor R271 and the drain of MOS tube Q3, the other end of resistor R271 is connected to the power supply, the gate of MOS tube Q3 is electrically connected to resistor R249 and resistor R248 respectively, and the other end of resistor R249 is electrically connected to the output end of control module 1 , the other end of the resistor R248 is commonly grounded with the source of the MOS tube Q3, the other end of the resistor R95 is electrically connected to the resistor R106 and the inverting input terminal of the operational amplifier U17-A respectively, the other end of the resistor R104 is electrically connected to the non-inverting input terminal of the operational amplifier U17-A and the resistor R96 respectively, the other end of the resistor R106 is electrically connected to the resistor R119, the resistor R120, the resistor R122, the resistor R123 and the resistor R246 respectively, the other ends of the resistors R119, R120, R122 and R123 are all electrically connected to the input terminal of the multiplexer U20, the other end of the resistor R246 is electrically connected to the resistor R247 and the capacitor C139 respectively,The other end of the resistor R247 is electrically connected to the first end of the capacitor C140, the diode D50 and the input end of the control module 1 respectively, the other end of the capacitor C140 and the second end of the diode D50 are commonly grounded, the third end of the diode D50 is connected to the power supply, the other end of the resistor R96 is electrically connected to the resistor R187, the other end of the resistor R187 is electrically connected to the drain of the MOS tube Q1 and the resistor R116 respectively, the source of the MOS tube Q1 is electrically connected to the resistor R291 and the source of the MOS tube Q2 respectively, the gate of the MOS tube Q1 and the gate of the MOS tube Q2 are commonly connected to the resistor R142, the other end of the resistor R142 is electrically connected to the negative electrode of the diode D34 and the diode D28 respectively, the positive electrodes of the diode D34 and the diode D28 are electrically connected to the input end of the multiplexer U20, the other end of the resistor R116 is electrically connected to the gate of the MOS tube Q2 and resistor R108, the other end of resistor R108 is electrically connected to resistor R13, the input end of operational amplifier U17-B, capacitor C36 and one end of capacitor C38 respectively, the in-phase input end of operational amplifier U17-B is electrically connected to resistor R115, the other end of resistor R115 is grounded, the inverting input end of operational amplifier U17-B, the other end of capacitor C36 and capacitor C38 are commonly connected to one end of resistor R110, the other end of resistor R110 is electrically connected to the output end of multiplexer U20, the other end of resistor R13 is electrically connected to capacitor C122 and resistor R14 respectively, the other end of resistor R14 is electrically connected to capacitor C128, the first end of diode D5 and the input end of control module 1 respectively, the other end of capacitor C128 is electrically connected to the second end of diode D5 and grounded, and the third end of diode D5 is connected to the power supply. ,

[0051] like Fig.11 As shown, the second current acquisition module 4 in this embodiment also includes a buffer unit, which includes a resistor R210, a resistor R256 and a capacitor C35, wherein the resistor R210 is electrically connected to the positive terminal of the power input of the terminal row J2, the resistor R256 is electrically connected to the negative terminal of the power input of the terminal row J2, the other ends of the resistor R210 and the resistor R256 are electrically connected to the other ends of the capacitor C35 and the resistor R96 respectively, and the other end of the capacitor C35 is grounded.

[0052] It should be noted that the buffer unit provided can prevent the circuit from being broken down due to excessive current, thus achieving a protective effect.

[0053] Specifically, the diode D74, the diode D2, the diode D50 and the diode D5 in this embodiment are all of the type BAT54S; the chip type of the control module 1 is STM32F407IGT6 / LQFP176.

[0054] How it works

[0055] The control module 1 is set to control the IGBT driving module 2 to output the control current to the welding clamp, the first current acquisition module 3 and the second current acquisition module 4 both acquire the control current output to the welding clamp, and the voltage acquisition module 5 acquires the voltage fed back by the welding clamp, and the acquired output control current and voltage are both transmitted to the control module 1;

[0056] The control module 1 determines the magnitude of the control current values ​​collected by the first current collection module 3 and the second current collection module 4. If the difference between the two control current values ​​is within the allowable range, it proves that the operation status of the welding clamp and the collection module is normal, and the current value fed back by the second current collection module 4 is used as the collection value;

[0057] The control module 1 calculates the resistance according to the current value fed back by the second current acquisition module 4 and the voltage value fed back by the welding clamp collected by the voltage acquisition module 5, and determines the state of the welding point and the welding quality according to the resistance;

[0058] If the detection resistance does not meet the requirements, the control module 1 adjusts the output current value and re-controls the IGBT drive module to output the adjusted current to the welding clamp.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A medium frequency welding controller, It is characterized in that It comprises a control module (1), an IGBT driving module (2), a first current acquisition module (3), a second current acquisition module (4) and a voltage acquisition module (5), wherein: The input end of the IGBT driving module (2) is electrically connected to the output end of the control module (1), and the control module (1) outputs a control current to the welding clamp through the IGBT driving module (2); The output end of the first current acquisition module (3) is electrically connected to the input end of the control module (1) and is used to acquire the control current and transmit the acquired value to the control module (1); The output ends of the second current acquisition module (4) and the voltage acquisition module (5) are both electrically connected to the input end of the control module (1); the second current acquisition module (4) is used to acquire the control current, and the voltage acquisition module (5) is used to acquire the voltage fed back by the welding clamp, and transmit the acquired control current and the acquired voltage fed back by the welding clamp to the control module (1); The control module (1) outputs a corresponding regulating current according to the collected control current and the collected voltage fed back by the welding clamp.

2. The medium frequency welding controller according to claim 1, Features: The IGBT driving module (2) comprises a voltage-stabilizing diode D17, a resistor R12, a resistor R23, a chip U7, a resistor R24, a capacitor C35, a diode D19, a capacitor C34, a capacitor C33, a resistor R25, a resistor R28, a resistor R22, a transistor Q3, a transistor Q2, a resistor R29, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a capacitor C45, a bidirectional trigger diode D20 and a driving chip M1, wherein the cathode of the voltage-stabilizing diode D17 is electrically connected to the input end of the control module (1), and the anode of the voltage-stabilizing diode D17 is electrically connected to the resistor ... R23 is electrically connected to resistor R12, chip U7 has 16 pins, the other end of resistor R23 is electrically connected to pin 7 and pin 6 of chip U7 respectively, the other end of resistor R12 is electrically connected to pin 8 and pin 5 of chip U7 respectively, pin 1 and pin 4 of chip U7 are grounded, pin 2 of chip U7 is connected to power supply, pin 3 of chip U7 is electrically connected to one end of resistor R24, the other end of resistor R24 ​​is electrically connected to power supply, pin 16 of chip U7 is electrically connected to the positive pole of capacitor C33, capacitor C34 and diode D19 respectively, the other end of capacitor C34 is electrically connected to diode D The negative electrode of 19 is electrically connected to the pin 14 of the chip U7, the other end of the capacitor C33 and the pin 13 of the chip U7 are electrically connected to the collector of the transistor Q3, the pin 11 of the chip U7 is electrically connected to one end of the resistor R25, the other end of the resistor R25 is electrically connected to the resistor R28, the base of the transistor Q3, the base of the transistor Q2, and one end of the resistor R22, the pin 10 of the chip U7 is electrically connected to the other end of the resistor R28 and the collector of the transistor Q2, the other end of the resistor R22 is electrically connected to the emitter of the transistor Q2, the resistor R31 and the first common end of the resistor R32 The emitter of the transistor Q3 is electrically connected to the first common end of the resistor R29 and the resistor R30, respectively, the second common end of the resistor R29 and the resistor R30 is electrically connected to the first input end of the driving chip M1 and the second common end of the resistor R31 and the resistor R32, respectively, the second common end of R31 and the resistor R32 is electrically connected to the bidirectional trigger diode D20, the resistor R33 and the capacitor C45, respectively, the other end of the bidirectional trigger diode D20, the resistor R33 and the capacitor C45 is electrically connected to the second input end of the driving chip M1, and the output end of the driving chip M1 is electrically connected to the welding clamp device.

3. The medium frequency welding controller according to claim 1, Features: It also includes an amplifier circuit, which includes an input power supply, a resistor R493, a capacitor C138, a resistor R494, a resistor R103, a capacitor C40 and an operational amplifier U26-A, wherein one end of the resistor R493 is electrically connected to the input power supply, the other end of the resistor R493 is electrically connected to the capacitor C138, the resistor R494 and the in-phase input terminal of the operational amplifier U26-A respectively, the other ends of the capacitor C138 and the resistor R494 are both electrically connected to the resistor R103, the other end of the resistor R103 is electrically connected to the capacitor C40, the other end of the capacitor C40 is electrically connected to the inverting input terminal of the operational amplifier U26-A and are both electrically connected to the output terminal of the operational amplifier U26-A.

4. The medium frequency welding controller as claimed in claim 3, Features: The first current acquisition module (3) comprises a terminal row J20, a resistor R90, a resistor R64, a resistor R87, a resistor R88, a resistor R89, an operational amplifier U26-B, a resistor R91, a resistor R477, a resistor R99, a capacitor C37, a capacitor C194, a capacitor C125 and a diode D74, wherein the terminal row J20 is connected to an external Hall sensor cell, an input end of the terminal row J20 is electrically connected to one end of the resistor R90, the resistor R64 and the resistor R88, the other end of the resistor R88 is electrically connected to the resistor R89 ​​and the in-phase input end of the operational amplifier U26-B respectively, the other end of the resistor R89 ​​is electrically connected to the output end of the operational amplifier U26-A, and the resistor R90 The other end of the resistor R64 is electrically connected to the resistor R87 and grounded. The other end of the resistor R87 is electrically connected to the inverting input terminal of the operational amplifier U26-B, the resistor R91 and the capacitor C37 respectively. The other ends of the resistor R91 and the capacitor C37 are electrically connected to the output terminal of the operational amplifier U26-B and the resistor R477. The other end of the resistor R477 is electrically connected to the capacitor C194 and the resistor R99 respectively. The other end of the resistor R99 is electrically connected to the capacitor C125, the first end of the diode D74 and the input terminal of the control module (1) respectively. The other end of the capacitor C125 is electrically connected to the second end of the diode D74 and grounded. The third end of the diode D74 is connected to the power supply.

5. The medium frequency welding controller as claimed in claim 4, Features: The voltage acquisition module (5) comprises an end row J2, a voltage transformer L8, a bidirectional trigger diode D38, a bidirectional trigger diode D37, a resistor R182, a capacitor C64, a capacitor C80, a resistor R147, a resistor R144, a resistor R146, a resistor R184, a resistor R186, an operational amplifier U25-A, a resistor R8, a resistor R9, a capacitor C5, a capacitor C41 and a diode D2, wherein one end of the primary winding terminal and the secondary winding terminal of the voltage transformer L8 are both electrically connected to the end row J2, the other end of the primary winding terminal of the voltage transformer L8 is respectively electrically connected to the bidirectional trigger diode D38, the capacitor C80, the resistor R147 and the resistor R144, the other end of the secondary winding terminal of the voltage transformer L8 is respectively electrically connected to the bidirectional trigger diode D37, the resistor R182, the capacitor C64 and the resistor R146, the bidirectional trigger diode D38 is electrically connected to the bidirectional trigger diode D37 The other end is grounded, the other ends of resistor R182, capacitor C64, capacitor C80 and resistor R147 are commonly grounded, the other end of resistor R144 is electrically connected to resistor R186 and the inverting input end of operational amplifier U25-A respectively, the other end of resistor R146 is electrically connected to the non-inverting input end of operational amplifier U25-A and resistor R184 respectively, the other end of resistor R184 is electrically connected to the output end of operational amplifier U26-A, the other end of resistor R186 is electrically connected to the output end of operational amplifier U25-A and resistor R8 respectively, the other end of resistor R8 is electrically connected to capacitor C5 and resistor R9 respectively, the other end of capacitor C5 is grounded, the other end of resistor R9 is electrically connected to capacitor C41, the first end of diode D2 and the input end of control module (1) respectively, the other end of capacitor C41 is electrically connected to the second end of diode D2 and grounded, and the third end of diode D2 is connected to the power supply.

6. The medium frequency welding controller as claimed in claim 5, Features: The second current acquisition module (4) comprises a voltage transformer L6, a resistor R161, a resistor R181, a resistor R4, a bidirectional trigger diode D27, a bidirectional trigger diode D26, a resistor R69, a capacitor C4, a capacitor C32, a resistor R6, a resistor R95, a resistor R104, a resistor R106, an operational amplifier U17-A, a resistor R96, a resistor R187, a resistor R116, a MOS tube Q1, a MOS tube Q2, a resistor R108, a resistor R291, a resistor R142, a diode D34, a diode D28, a resistor R119, a resistor R120, a resistor R122, a resistor R123, a resistor R110, a resistor R115, an operational amplifier U17-B, a Capacitor C36, capacitor C38, resistor R13, capacitor C122, resistor R14, capacitor C128, diode D5, resistor R246, capacitor C139, resistor R247, capacitor C140, diode D50, resistor R271, MOS tube Q3, resistor R248, resistor 249, analog multiplexer U20, wherein one end of the primary winding terminal and the secondary winding terminal of the voltage transformer L6 are both electrically connected to the terminal row J2, the other end of the primary winding terminal of the voltage transformer L6 is electrically connected to the resistor R161, the other end of the secondary winding terminal of the voltage transformer L6 is electrically connected to the resistor R181, and the other end of the resistor R161 is respectively connected to the bidirectional trigger diode D27 and the resistor R4, capacitor C32, resistor R6 and one end of resistor R95 are electrically connected, the other end of resistor R181 is electrically connected to the other end of resistor R4, bidirectional trigger diode D26, resistor R69, capacitor C4 and resistor R104, the other end of bidirectional trigger diode D27 and the other end of bidirectional trigger diode D26 are commonly grounded, the other end of resistor R69, capacitor C4 and capacitor C32 are commonly grounded, the other end of resistor R6 is electrically connected to resistor R271 and the drain of MOS tube Q3, the other end of resistor R271 is connected to the power supply, the gate of MOS tube Q3 is electrically connected to resistor R249 and resistor R248 respectively, and the other end of resistor R249 is electrically connected to the output end of control module (1) , the other end of the resistor R248 is commonly grounded with the source of the MOS tube Q3, the other end of the resistor R95 is electrically connected to the resistor R106 and the inverting input terminal of the operational amplifier U17-A respectively, the other end of the resistor R104 is electrically connected to the non-inverting input terminal of the operational amplifier U17-A and the resistor R96 respectively, the other end of the resistor R106 is electrically connected to the resistor R119, the resistor R120, the resistor R122, the resistor R123 and the resistor R246 respectively, the other ends of the resistors R119, R120, R122 and R123 are all electrically connected to the input terminal of the multiplexer U20, the other end of the resistor R246 is electrically connected to the resistor R247 and the capacitor C139 respectively,The other end of the resistor R247 is electrically connected to the first end of the capacitor C140, the diode D50 and the input end of the control module (1), the other end of the capacitor C140 and the second end of the diode D50 are commonly grounded, the third end of the diode D50 is connected to the power supply, the other end of the resistor R96 is electrically connected to the resistor R187, the other end of the resistor R187 is electrically connected to the drain of the MOS transistor Q1 and the resistor R116, the source of the MOS transistor Q1 is electrically connected to the resistor R291 and the source of the MOS transistor Q2, the gate of the MOS transistor Q1 and the gate of the MOS transistor Q2 are commonly connected to the resistor R142, the other end of the resistor R142 is electrically connected to the negative electrode of the diode D34 and the negative electrode of the diode D28, the positive electrodes of the diode D34 and the diode D28 are both electrically connected to the input end of the multiplexer U20, the other end of the resistor R116 is electrically connected to the gate of the MOS transistor Q2, and resistor R108, the other end of resistor R108 is respectively electrically connected to resistor R13, the input end of operational amplifier U17-B, capacitor C36 and one end of capacitor C38, the in-phase input end of operational amplifier U17-B is electrically connected to resistor R115, the other end of resistor R115 is grounded, the inverting input end of operational amplifier U17-B, capacitor C36 and the other end of capacitor C38 are commonly connected to one end of resistor R110, the other end of resistor R110 is electrically connected to the output end of multiplexer U20, the other end of resistor R13 is respectively electrically connected to capacitor C122 and resistor R14, the other end of resistor R14 is respectively electrically connected to capacitor C128, the first end of diode D5 and the input end of control module (1), the other end of capacitor C128 is electrically connected to the second end of diode D5 and grounded, and the third end of diode D5 is connected to the power supply.

7. The medium frequency welding controller as claimed in claim 6, Features: The second current acquisition module (4) further comprises a buffer unit, the buffer unit comprising a resistor R210, a resistor R256 and a capacitor C35, wherein the resistor R210 is electrically connected to the positive terminal of the power input of the terminal row J2, the resistor R256 is electrically connected to the negative terminal of the power input of the terminal row J2, the other ends of the resistor R210 and the resistor R256 are electrically connected to the other ends of the capacitor C35 and the resistor R96 respectively, and the other end of the capacitor C35 is grounded.

8. The medium frequency welding controller as claimed in claim 7, Features: The diode D74, the diode D2, the diode D50 and the diode D5 are all of model BAT54S.

9. The medium frequency welding controller as claimed in claim 3, Features: The power input to the amplifier circuit is 2.5V.

10. The medium frequency welding controller according to claim 1, Features: The chip model of the control module (1) is STM32F407IGT6 / LQFP176.

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