A super farad capacitor resistance welding machine and its capacitor independent balance management method

Abstract

The present invention discloses a super farad capacitor resistance welding machine and a method for managing independent capacitor balance. The capacitor resistance welding device includes a positive electrode welding arm, a negative electrode welding arm, a farad capacitor group, and an electric pulse forming module. The farad capacitor group includes a first farad capacitor and a second farad capacitor connected in series. The first farad capacitor and the second farad capacitor are respectively connected in parallel with a capacitor balance charging module, wherein the capacitor balance charging module includes a DC step-down constant current module, a constant current controller, and a constant voltage controller. The first farad capacitor and the second farad capacitor in the farad capacitor group are independently and balancedly charged, thereby obtaining a good charging balance effect, charging the series capacitor module with the maximum stored energy and the balance effect of the potential of the two capacitors in a short time, and solving the extreme problem that the capacitor monomer potential voltage difference when the series capacitor module is charged in series may cause damage to a single capacitor.

Description

Technical Field

[0001] The invention relates to a super farad capacitor type resistance welding machine and a capacitor independent balance management method thereof. Background Art

[0002] Supercapacitors are electrochemical components that store energy through polarized electrolytes. Currently, supercapacitors are increasingly being used in pulse welding machines because of their long life, safe charging, and large capacitance.

[0003] The supercapacitor resistance welding machine discharges through the capacitor and transmits it to the welding arm for welding. However, when multiple capacitors are connected in series, if the voltage on each capacitor is inconsistent, the output energy will be reduced, and in the long run, the service life of the supercapacitor will be shortened. In addition, the series capacitor module uses the capacitor monomer voltage difference when charging in series, which may cause extreme problems such as damage to a single capacitor, and the consistency of capacitor charging needs to be maintained. Among them, the replacement of the electric pulse forming module in the prior art is relatively troublesome, which is not conducive to rapid installation and replacement. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a super farad capacitor resistance welding machine and a capacitor independent balance management method thereof.

[0005] The technical solution adopted by the present invention to solve the technical problem is a super farad capacitor resistance welding machine, comprising a box body, wherein a capacitor resistance welding device, two groups of single-channel capacitor equalization charging modules connected to the capacitor resistance welding device, a constant power dual-channel output switching power supply respectively connected to the two groups of capacitor equalization charging modules, and a microchip pulse parameter controller for controlling the capacitor resistance welding device are arranged in the box body, wherein the capacitor resistance welding device comprises a positive electrode welding arm, a negative electrode welding arm, a farad capacitor group connected in series between the positive electrode welding arm and the negative electrode welding arm, and at least one electric pulse forming module connected in series between the negative electrode welding arm and the farad capacitor group, wherein the farad capacitor group comprises a first farad capacitor and a second farad capacitor connected in series, and the first farad capacitor and the second farad capacitor are respectively connected in parallel with a capacitor equalization charging module connected in a single channel, wherein the capacitor equalization charging module comprises a DC step-down constant current module connected in a single channel to the constant power dual-channel output switching power supply, a constant current controller and a constant voltage controller for detecting the current of a single farad capacitor.

[0006] Among them: a series conductor connecting the first farad capacitor and the second farad capacitor is arranged between the farad capacitor groups, a negative conductor is arranged in series between the electric pulse forming module and the first farad capacitor, the negative conductor is fixedly connected to the first farad capacitor, and the electric pulse forming module is arranged at the bottom of the negative conductor and is arranged perpendicular to the negative conductor.

[0007] Wherein: the capacitor balancing charging module is electrically connected to the farad capacitor group, and the farad capacitor group is electrically connected to the electric pulse forming module, wherein the capacitor balancing charging module performs balanced charging on the farad capacitor group, and the electric pulse forming module controls the farad capacitor group to output pulses.

[0008] Wherein: the constant power dual-output switching power supply is electrically connected to the temperature sensing element.

[0009] Wherein: a sampling resistor for sampling and detecting the current value by the constant current controller is also arranged on the output end of the capacitor equalization charging module.

[0010] Wherein: the microchip pulse parameter controller is respectively associated with the DC step-down constant current module, the constant current controller, the constant voltage controller in the capacitor balanced charging module, the electric pulse forming module in the capacitive resistance welding device, and the constant power dual-output switching power supply.

[0011] A method for independent capacitance balance management of a super farad capacitor resistance welding machine, the method comprising the following steps:

[0012] A. Constant current charging stage: When the constant voltage controller detects that the capacitor voltage is closer to 0 volts, the capacitor charge is extremely small, and the internal resistance is extremely small. If it is charged, it will be short-circuited. In order to prevent the capacitor from being short-circuited during charging, the constant current controller used to detect the sampling resistor controls the charging current, and the capacitor is charged at the constant current stage;

[0013] B. In the constant voltage charging stage, when the constant voltage controller detects that the capacitor voltage is closer to the rated voltage, its capacitor charge gradually increases, the charging voltage gradually increases, and the charging current gradually decreases, causing the DC step-down constant current module to stop charging.

[0014] Wherein: the constant current controller is used to detect whether the current across the sampling resistor is at a constant value, so that the DC step-down constant current module is in the step-down constant current stage, and the capacitor equalization charging module makes voltage or current adjustments to avoid damage to the DC step-down constant current module and the Farad capacitor group.

[0015] The beneficial effects of the present invention are as follows: the capacitive resistance welding device comprises a positive electrode welding arm, a negative electrode welding arm, a farad capacitor group connected in series between the positive electrode welding arm and the negative electrode welding arm, and an electric pulse forming module arranged in series between the negative electrode welding arm and the farad capacitor group; the farad capacitor group comprises a first farad capacitor and a second farad capacitor connected in series; the first farad capacitor and the second farad capacitor are respectively connected in parallel with a capacitor balancing charging module, wherein the capacitor balancing charging module comprises a DC step-down constant current module, a constant current controller, and a constant voltage controller. The first farad capacitor and the second farad capacitor in the farad capacitor group are independently and balancedly charged, thereby obtaining a good charging balance effect, charging the series farad capacitor group with the maximum storage energy and the balancing effect of the potential of the two capacitors in a short time, and at the same time solving the extreme problem that the capacitor monomer potential voltage difference when the farad capacitor group is charged in series may cause damage to a single capacitor therein. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a structural schematic diagram of the capacitive resistance welding device of the present invention;

[0018] Figure 2 It is a schematic diagram of the working circuit of the constant power dual-output switching power supply and the balanced charging module of the present invention;

[0019] Figure 3 It is a schematic diagram of the circuit structure of the balanced charging module of the present invention;

[0020] Figure 4 It is a circuit connection schematic diagram of the capacitive resistance welding device of the present invention;

[0021] Figure 5 It is a circuit diagram of capacitor charging and capacitor discharging of the present invention;

[0022] Figure 6 It is a partial cross-sectional structural schematic diagram of the present invention;

[0023] Figure 7 is another partial cross-sectional structural schematic diagram of the present invention;

[0024] Figure 8 It is a logical relationship diagram of the microchip pulse parameter controller of the present invention;

[0025] Fig. 9 It is a schematic diagram of mode selection of the present invention. DETAILED DESCRIPTION

[0026] Reference Figures 1 to 9A super farad capacitor resistance welding machine includes a box 111, wherein the box 111 is provided with a capacitor resistance welding device 5, two groups of single-channel capacitor equalization charging modules 1 connected to the capacitor resistance welding device 5, a constant power dual-channel output switching power supply 8 respectively connected to the two groups of capacitor equalization charging modules 1, and a microchip pulse parameter controller 9 for controlling the capacitor resistance welding device 5, wherein the capacitor resistance welding device 5 includes a positive electrode welding arm 52, a negative electrode welding arm 53, and a farad capacitor group 54 connected in series between the positive electrode welding arm 52 and the negative electrode welding arm 53 , at least one electric pulse forming module 55 arranged in series between the negative electrode welding arm 53 and the farad capacitor group 54, the farad capacitor group 54 includes a first farad capacitor 541 and a second farad capacitor 542 connected in series, and the first farad capacitor 541 and the second farad capacitor 542 are respectively connected in parallel with a capacitor equalizing charging module 1 connected in a single path, wherein the capacitor equalizing charging module 1 includes a DC step-down constant current module 11 connected in a single path to a constant power dual-channel output switching power supply 8, a constant current controller 12 for detecting the current of a single farad capacitor, and a constant voltage controller 13. Further, the capacitive resistance welding device 5, the capacitor equalizing charging module 1, and the constant power dual-channel output switching power supply 8 are all connected to a microchip pulse parameter controller 9.

[0027] Among them, the microchip pulse parameter controller 9 is respectively associated and connected to the DC step-down constant current module 11, the constant current controller 12, the constant voltage controller 13 in the capacitor balanced charging module 1, the electric pulse forming module 55 in the capacitive resistance welding device 5, and the constant power dual-output switching power supply 8.

[0028] In the present invention, a series conductor 56 connecting the first farad capacitor 541 and the second farad capacitor 542 is arranged between the farad capacitor group 54. A negative conductor 57 is arranged in series between the electric pulse forming module 55 and the first farad capacitor 541, and the negative conductor 57 is fixedly connected to the first farad capacitor 541. The electric pulse forming module 55 is arranged at the bottom of the negative conductor 57 and is arranged perpendicular to the negative conductor 57. The electric pulse forming module 55 arranged in close contact with the farad capacitor group 54 is easy to install and replace.

[0029] The capacitor balancing charging module 1 is electrically connected to the farad capacitor group 54, and the farad capacitor group 54 is electrically connected to the electric pulse forming module 55, wherein the capacitor balancing charging module 1 performs balanced charging on the farad capacitor group 54, and the electric pulse forming module 55 controls the farad capacitor group 54 to output pulses.

[0030] The constant voltage controller 13 controls the 2.7V constant voltage output, and the negative electrode welding arm 53 and the positive electrode welding arm 52 are both provided with a pulse output interface 58, and the pulse output interface 58 is fixedly connected to the welding pin 51. The capacitor equalizing charging module 1 is also provided with a sampling resistor 15, and the constant current controller 12 is used to detect the current value at both ends of the sampling resistor 15, wherein the sampling resistor 15 is respectively connected in series with the first farad capacitor 541 and the second farad capacitor 542, and the output end of the capacitor equalizing charging module 1 is also provided with a current limiting resistor 18, and the current limiting resistor 18 is connected in series with the sampling resistor 15, wherein the constant power dual-channel output switching power supply 8 has a built-in temperature protection module set to 85°C, and the capacitor resistance welding device 5, the capacitor equalizing charging module 1, and the constant power dual-channel output switching power supply 8 are all connected to the microchip pulse parameter controller 9, wherein the microchip pulse parameter controller 9 controls the output of pulse signals with different time widths of 0.5 to 10ms, so that the capacitor resistance welding device 5 performs pulse output in different time periods.

[0031] The first farad capacitor 541 and the second farad capacitor 542 are both 2.7V / 3000F super farad capacitors, which are connected in series with a conductor having a micro-resistance, that is, connected through a series conductor 56, to achieve a supercapacitor module with a rated voltage of 5.4V / 1500F, an ultra-low internal resistance of ≤0.5mΩ, and super energy ≥21000 joules, and a maximum short-circuit current of 10800A. Its output energy and output current are ideal power supplies for pulse resistance welding.

[0032] The electric pulse forming module 55 is installed vertically and close to the edge of the negative conductor 57 to avoid voltage drop loss caused by the capacitive pulse current flowing through the wire connection. At the same time, the electric pulse forming module 55 is installed at the bottom of the negative conductor 57 for easy disassembly and replacement.

[0033] The series voltage of the farad capacitor group 54 reaches the pulse voltage and welding power that meet the requirements of resistive welding. The greater the instantaneous power, the better the welding effect. The first farad capacitor 541 and the second farad capacitor 542 are independently connected in parallel to the capacitor balancing charging module 1, so that each farad capacitor is managed independently. The potential difference of each farad capacitor is detected by the constant voltage controller 13 to determine whether the capacitor is fully loaded with charge. At the same time, through the control of the constant current controller 12, the charging short-circuit state in which the voltage of the capacitor is zero when there is no charge is avoided, which is beneficial to protect the safe output of the DC step-down constant current module 11 and avoid over-current charging of the farad capacitor.

[0034] The electric pulse forming module 55 is composed of an array of metal oxide semiconductor field effect devices with ultra-large current capacity and low internal resistance connected in parallel, and a dedicated high-speed driving chip. The electric pulse forming module 55 is designed to be directly and losslessly brazed with the ultra-low loss metal conductor component and the metal oxide semiconductor field effect device array, which solves the assembly process contradiction between the metal oxide semiconductor field effect device, the large current metal conductor and the small signal high-speed driving chip. The three are each a carrier, realizing the low-loss formation and output of small signal high-speed driving and controlling huge pulse current.

[0035] The capacitor balancing charging module 1 is composed of a high-performance (DC-DC) conversion module as the core, and is designed to have two independent channels to balance the first farad capacitor 541 and the second farad capacitor 542 connected in series. The capacitor balancing charging module 1 of each channel (CH1 / CH2) generates an output of 2.7V constant voltage and a constant current of up to 12A, and independently charges the connected first farad capacitor 541 and the second farad capacitor 542 in parallel. It is composed of the capacitor balancing charging module 1 and the peripheral constant voltage control circuit, constant current control circuit, and temperature protection circuit, and its purpose is to realize the two-stage fast charging management mode of the constant current charging stage and the constant voltage charging stage of the supercapacitor monomer.

[0036] Furthermore, the temperature protection value is set to 85°C on the substrate inside the capacitor balancing charging module 1, thereby ensuring the safety and reliability of the capacitor balancing charging module 1 when charging with a large current output. The capacitor balancing charging module 1 has two consistent parameters and independent channels, and simultaneously charges the first farad capacitor 541 and the second farad capacitor 542 in parallel in a balanced manner, thereby realizing independent charging and management of the supercapacitors, thereby obtaining a good charging balance effect, charging the series-connected farad capacitor group 54 with the maximum storage energy and the balancing effect of the potential of the two capacitors in a short time, and solving the extreme problem that the series-connected farad capacitor group 54 is damaged due to the difference in the potential and voltage of the capacitor monomer when charging in series.

[0037] Since the capacitor balancing charging module 1 charges the farad capacitor group 54 in a balanced manner using two channels respectively, and the farad capacitor group 54 formed by the first farad capacitor 541 and the second farad capacitor 542 is connected in series, the constant power dual-channel output switching power supply 8 realizes the step-down supply of the mains power and converts it into a dual-channel independent output structure, thereby providing independent power supply for the capacitor balancing charging module 1; in addition, in order to prevent power short circuit caused by damage to the supercapacitor, the constant power dual-channel output switching power supply 8 is designed as a constant power mode, and at the same time has a temperature abnormality protection function for the farad capacitor group 54, thereby improving the working safety of the farad capacitor group 54, and the temperature protection is composed of a temperature sensing element 14 with a detection temperature of 65°C mounted on the outer shell of the first farad capacitor 541 and the outer shell of the second farad capacitor 542.

[0038] The microchip pulse parameter controller 9 is composed of hardware MCU, peripheral electronic circuits and software programming. Its function is to set and control the output of pulse signals with different time widths of 0.5 to 10 milliseconds. It also has discharge minimum interval protection, low capacitance discharge protection, pulse current detection display, capacitor module voltage detection display, and workpiece circuit abnormal discharge alarm.

[0039] The microchip pulse parameter controller 9 software is designed to improve welding reliability while reducing the difficulty of operating parameter settings.

[0040] The capacitive resistance welding device 5 and the capacitor equalizing charging module 1 are both connected to the box 111, and the capacitive resistance welding device 5 and the capacitor equalizing charging module 1 are both arranged in the box 111. A fixing frame 7 is arranged in the box 111, and the capacitive resistance welding device 5 is connected to the fixing frame 7 and extends out of the box 111. The capacitive resistance welding device 5 is provided with a pressure regulator, an upward follow-up mechanism, and a downward stepping linkage mechanism. The upward follow-up mechanism is provided with an upward push trigger switch 621, and the downward stepping linkage mechanism is provided with a downward pull trigger switch 622. The capacitive resistance welding device 5 is fixed with a welding needle 51. The microchip pulse parameter controller 9 is connected with the upward push trigger switch 621 and the downward pull trigger switch 622 to determine the welding direction.

[0041] The pressure regulator includes a first spring group 721 and a second spring group 722 disposed above and below the capacitive resistance welding device 5, and an adjusting end 723 disposed on the fixing frame 7 and used to adjust the tightness of the first spring group 721 and the second spring group 722, and the adjusting end 723 includes an adjusting screw 724 and a connecting module 725 connecting the adjusting screw 724 and the first spring group 721. The first spring group 721 and the second spring group 722 enable the welding head 5 to reach a horizontal balance state.

[0042] The upward follow-up mechanism includes a first force transmission end 611a that contacts the capacitive resistance welding device 5, a moving frame 612 fixed to the first force transmission end 611a, a linkage bar 613 fixed to the moving frame 612, and an upward push-up contact end 623 arranged on the linkage bar 613 and cooperating with the upward push-up trigger switch 621 to perform a switch operation.

[0043] The stepping-down linkage mechanism includes a first force transmission end 611a that contacts the capacitive resistance welding device 5, a mobile frame 612 fixedly arranged to contact the first force transmission end 611a, a linkage bar 613 fixed to the mobile frame 612, and a pull-down contact end 624 arranged on the linkage bar 613 and cooperating with a pull-down trigger switch 622 for switch operation. The end of the linkage bar 613 is connected to a pedal linkage device that can be used to pull down the linkage bar by pedaling. The mobile frame 612 is provided with a second force transmission end 611, and the second force transmission end 611 is connected to the fixed frame 7. The first force transmission end 611a and the second force transmission end 611 transmit the direction of the upward or downward force.

[0044] The pedal linkage device includes a pedal 631 and an extension column 632 connecting the pedal 631 and the linkage bar 613. The pedal 631 is stepped on to pull the extension column 632 to drive the linkage bar 613 to complete the step-down linkage.

[0045] The first spring group 721 and the second spring group 722 are provided so that the capacitive resistance welding device 5 can return to its original position after completing the operation of pushing up or pushing down. The pressure and angle of the capacitive resistance welding device 5 can be controlled by adjusting the degree to which the adjusting screw 724 enters the fixing frame 7. After the capacitive resistance welding device 5 is pushed up, the extension column 632 is pushed to drive the linkage bar 613 to move upward, so that the push-up contact end 623 moves upward to touch the push-up trigger switch 621 to perform spot welding. Since the pressure regulator has a pulling force, the capacitive resistance welding device 5 is restored to its original position after welding is completed.

[0046] A limiting strip 73 is provided on one side of the fixed frame 7 to prevent the movable frame 612 from falling out.

[0047] The fixing frame 7 is provided with a middle clamping plate 71, and the capacitive resistance welding device 5 is hinged to the side of the fixing frame 7, so that the positive electrode welding arm 52 and the negative electrode welding arm 53 can move up and down.

[0048] The movable frame 612 is provided with a second force transmission end 611 , and the second force transmission end 611 is connected to the fixed frame 7 .

[0049] By pushing up the capacitor resistance welding device 5 or pressing down the capacitor resistance welding device 5 to the extreme, the microchip pulse parameter controller 9 selects the push-up welding mode or the step-down welding mode.

[0050] If the push-up welding mode is selected, the weldment is held and touched with the welding needle 51, and after touching the welding needle 51, force is applied to push up the capacitive resistance welding device 5, and the capacitive resistance welding device 5 moves upward to drive the first force transmission end 611a, the moving frame 612, the linkage bar 613, and the push-up contact end 623 set on the linkage bar 613, and the push-up contact end 623 conflicts with the push-up trigger switch 621. After receiving the signal from the push-up trigger switch 621, the microchip pulse parameter controller 9 controls the electric pulse forming module 55 to transmit current to the capacitive resistance welding device 5, the welding needle 51, and the weldment for welding.

[0051] If the foot-operated welding mode is selected, the weldment is placed, and the capacitive resistance welding device 5 is pressed down by driving the foot pedal 631 downward, driving the pull-down contact end 624, and the pull-down contact end 624 contacts the pull-down trigger switch 622. After receiving the signal from the pull-down trigger switch 622, the microchip pulse parameter controller 9 controls the electric pulse forming module 55 to deliver current to the capacitive resistance welding device 5, the welding needle 51, and the weldment for welding.

[0052] A method for independent capacitance balance management of a super farad capacitor resistance welding machine, the method comprising the following steps:

[0053] A. Constant current charging stage: when the constant voltage controller 13 detects that the capacitor voltage is closer to 0 volts, the capacitor charge is extremely small, and the internal resistance is extremely small. If the capacitor is charged, it will be short-circuited. In order to prevent the capacitor from being short-circuited during charging, the constant current controller 12 for detecting the sampling resistor 15 controls the charging current, and the capacitor is charged at the constant current stage;

[0054] Here, during the constant current charging stage, the charging circuit is a pure resistance circuit. According to Ohm's law, under rated power, the charging current increases as the capacitor voltage increases, and decreases as the capacitor voltage decreases.

[0055] B. Constant voltage charging stage: When the constant voltage controller 13 detects that the capacitor voltage is closer to the rated voltage, the capacitor charge gradually increases, the charging voltage gradually increases, and the charging current gradually decreases, so that the DC step-down constant current module 11 stops charging.

[0056] Among them, the constant current controller 12 is used to detect whether the current across the sampling resistor 15 is at a constant value, so that the DC step-down constant current module 11 is in the step-down constant current stage, and the capacitor equalization charging module 1 makes voltage or current adjustments to avoid damage to the DC step-down constant current module 11 and the farad capacitor group 54.

[0057] Furthermore, the first farad capacitor 541 and the second farad capacitor 542 are balanced charged, wherein the first farad capacitor 541 and the second farad capacitor 542 are arranged in series, and the constant power dual-output switching power supply 8 isolates the mains power and steps down the voltage to DC 12V and transmits it to each capacitor balanced charging module 1 respectively, and each capacitor balanced charging module 1 performs balanced charging on the first farad capacitor 541 and the second farad capacitor 542 respectively.

[0058] Next, the capacitor equalization charging module 1 includes a DC step-down constant current module 11, a constant current controller 12, and a constant voltage controller 13. The DC step-down constant current module 11 is a DC step-down type, and converts the constant power dual-channel output switching power supply 812V into a 2.7V constant voltage and a 12A output constant current and independently charges the connected first farad capacitor 541 or the second farad capacitor 542 in parallel.

[0059] The constant current controller 12 and the constant voltage controller 13 correspondingly control the constant current charging phase and the constant voltage charging phase of the first farad capacitor 541 or the second farad capacitor 542 .

[0060] The temperature sensing element 14 is correspondingly attached between the first farad capacitor 541 and the second farad capacitor 542, wherein one end of the temperature sensing element 14 is electrically connected to the constant power dual-output switching power supply 8, wherein the temperature peak value of the temperature sensing element 14 is set to 65°C, and shutdown protection processing is performed if the temperature exceeds this value.

[0061] In the present invention, the capacitive resistance welding device 5 comprises a positive electrode welding arm 52, a negative electrode welding arm 53, a farad capacitor group 54 connected in series between the positive electrode welding arm 52 and the negative electrode welding arm 53, and an electric pulse forming module 55 arranged in series between the negative electrode welding arm 53 and the farad capacitor group 54. The farad capacitor group 54 comprises a first farad capacitor 541 and a second farad capacitor 542 connected in series. The first farad capacitor 541 and the second farad capacitor 542 are respectively connected in parallel with a capacitor balancing charging module 1, wherein the capacitor balancing charging module 1 comprises a DC step-down constant current module 11, a constant current controller 12, and a constant voltage controller 13. The first farad capacitor 541 and the second farad capacitor 542 in the farad capacitor group 54 are independently and balancedly charged, thereby obtaining a good charging balance effect, which is to charge the series farad capacitor group 54 with the maximum stored energy and the balanced effect of the potential of the two capacitors in a short time, and at the same time solve the extreme problem that the capacitor monomer potential voltage difference when the farad capacitor group 54 is charged in series may cause damage to a single capacitor therein.

Claims

1. A super farad capacitor resistance welding machine, comprising a box (111), characterized in that: The box (111) is provided with a capacitive resistance welding device (5), two groups of single-channel capacitor equalization charging modules (1) connected to the capacitive resistance welding device (5), a constant power dual-channel output switching power supply (8) respectively connected to the two groups of capacitor equalization charging modules (1), and a microchip pulse parameter controller (9) for controlling the capacitive resistance welding device (5), wherein the capacitive resistance welding device (5) comprises a positive electrode welding arm (52), a negative electrode welding arm (53), a farad capacitor group (54) connected in series between the positive electrode welding arm (52) and the negative electrode welding arm (53), and at least one electric pulse forming module (54) connected in series between the negative electrode welding arm (53) and the farad capacitor group (54). Block (55), the farad capacitor group (54) comprises a first farad capacitor (541) and a second farad capacitor (542) connected in series, the first farad capacitor (541) and the second farad capacitor (542) are respectively connected in parallel to a capacitor balancing charging module (1) connected in a single path, wherein the capacitor balancing charging module (1) comprises a DC step-down constant current module (11) connected in a single path to a constant power dual-path output switching power supply (8), a constant current controller (12) and a constant voltage controller (13) for detecting a current of a single farad capacitor; and a sampling resistor (15) for the constant current controller (12) to sample and detect a current value is also provided at the output end of the capacitor balancing charging module (1).

2. A super farad capacitor resistance welding machine according to claim 1, characterized in that: A series conductor (56) connecting a first farad capacitor (541) and a second farad capacitor (542) is arranged between the farad capacitor group (54); a negative electrode conductor (57) is arranged in series between the electric pulse forming module (55) and the first farad capacitor (541); the negative electrode conductor (57) is fixedly connected to the first farad capacitor (541); and the electric pulse forming module (55) is arranged at the bottom of the negative electrode conductor (57) and is arranged perpendicular to the negative electrode conductor (57).

3. A super farad capacitor resistance welding machine according to claim 1, characterized in that: The capacitor balancing charging module (1) is electrically connected to the farad capacitor group (54), and the farad capacitor group (54) is electrically connected to the electric pulse forming module (55), wherein the capacitor balancing charging module (1) performs balanced charging on the farad capacitor group (54), and the electric pulse forming module (55) controls the farad capacitor group (54) to perform pulse output.

4. The super farad capacitor resistance welding machine according to claim 1, characterized in that: The constant power dual-output switching power supply (8) is electrically connected to the temperature sensing element (14).

5. The super farad capacitor resistance welding machine according to claim 1, characterized in that: The microchip pulse parameter controller (9) is respectively connected to a DC step-down constant current module (11), a constant current controller (12), a constant voltage controller (13) in a capacitor equalizing charging module (1), an electric pulse forming module (55) in a capacitor resistance welding device (5), and a constant power dual-output switching power supply (8).

6. A method for managing the independent balance of capacitance of a super farad capacitor resistance welding machine, characterized in that: Applied to the super farad capacitor resistance welding machine according to any one of claims 1 to 5, the capacitor independent balance management method of the super farad capacitor resistance welding machine comprises the following steps: A. Constant current charging stage: when the constant voltage controller (13) detects that the capacitor voltage is closer to 0 volts, the capacitor charge is extremely small, the internal resistance is extremely small, and if it is charged, it will be short-circuited. In order to prevent the capacitor from being short-circuited during charging, the constant current controller (12) for detecting the sampling resistor (15) controls the charging current, and the capacitor is charged at the constant current stage; B. In the constant voltage charging stage, when the constant voltage controller (13) detects that the capacitor voltage is closer to the rated voltage, the capacitor charge gradually increases, the charging voltage gradually increases, and the charging current gradually decreases, so that the DC step-down constant current module (11) stops charging.

7. The method for independent capacitance balance management of a super farad capacitor resistance welding machine according to claim 6, characterized in that: The constant current controller (12) is used to detect whether the current at both ends of the sampling resistor (15) is at a constant value, so that the DC step-down constant current module (11) is in a step-down constant current stage, and the capacitor equalization charging module (1) makes voltage or current adjustments to avoid damage to the DC step-down constant current module (11) and the farad capacitor group (54).

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