CN110977128A

CN110977128A - Super farad capacitive resistance welder and independent capacitor balance management method thereof

Info

Publication number: CN110977128A
Application number: CN201911409484.4A
Authority: CN
Inventors: 何社宏
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-04-10

Abstract

The invention discloses a super farad capacitance type resistance welding machine and a capacitance independent balance management method thereof, wherein a capacitance type resistance welding and welding device comprises a positive electrode welding arm, a negative electrode welding arm, a farad capacitance group and an electric pulse forming module, the farad capacitance group comprises a first farad capacitance and a second farad capacitance which are connected in series, the first farad capacitance and the second farad capacitance are respectively connected with a capacitance balance charging module in parallel, and the capacitance balance charging module comprises a direct current voltage reduction 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 uniformly charged, so that a good charge balance effect is obtained, the balance effect of the maximum stored energy and the two capacitor potentials is achieved in a short time for the series capacitor module, and the extreme problem that the single capacitor is possibly damaged due to the fact that the single capacitor is different in potential voltage of the capacitor which is output when the series capacitor module is charged in series is solved.

Description

Super farad capacitive resistance welder and independent capacitor balance management method thereof

Technical Field

The invention relates to a super farad capacitive resistance welder and a capacitance independent balance management method thereof.

Background

A supercapacitor is an electrochemical element that stores energy by polarizing the electrolyte. At present, farad capacitor is because of its long-lived, the safety of charging, and the electric capacity is big, consequently receives attention increasingly in applying electric capacity to the pulse welder.

The super capacitor type resistance welding machine discharges electricity through the capacitors and transmits the electricity to the welding arms for welding, however, when a plurality of capacitors are connected in series, if the voltage on each capacitor is inconsistent, the output energy can be reduced, and meanwhile, the service life of the super capacitor can be shortened after the super capacitor is used for a long time; and the extreme problem that the single capacitor in the series capacitor module is damaged due to the voltage difference of the capacitor units during series charging is caused, and the consistency of capacitor charging needs to be maintained. Wherein the electric pulse forming module among the prior art is changed comparatively troublesome, the quick installation and the change that are unfavorable for.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a super farad capacitive resistance welding machine and a capacitance independent balance management method thereof.

The technical scheme adopted by the invention for solving the technical problems is that the super farad capacitance type resistance welding machine comprises a box body, wherein a capacitance type resistance welding device, two groups of single-path capacitance equalizing charging modules connected with the capacitance type resistance welding device, a constant-power two-path output switching power supply respectively connected with the two groups of capacitance equalizing charging modules and a microchip pulse parameter controller for controlling the capacitance type resistance welding device are arranged in the box body, the capacitance type resistance welding device comprises an anode welding arm, a cathode welding arm, a farad capacitance group connected in series between the anode welding arm and the cathode welding arm, and at least one electric pulse forming module connected in series between the cathode welding arm and the farad capacitance group, the farad capacitance group comprises a first farad capacitance and a second farad capacitance which are connected in series, and the first farad capacitance and the second farad capacitance are respectively connected in parallel with the single-path capacitance equalizing charging modules, the capacitor equalizing charging module comprises a direct current voltage reduction constant current module, a constant current controller and a constant voltage controller, wherein the direct current voltage reduction constant current module is connected with a constant power two-way output switching power supply in a single-way mode, and the constant current controller and the constant voltage controller are used for detecting the current of a single farad capacitor.

Wherein: set up the series conductor who connects first farad electric capacity, second farad electric capacity between the farad electric capacity group, it sets up the negative conductor to establish ties between electric pulse formation module and the first farad electric capacity, negative conductor and first farad electric capacity fixed connection, electric pulse formation module set up in negative conductor bottom and with negative conductor mutually perpendicular setting.

Wherein: the capacitance equalizing charge module is electrically connected with the farad capacitor bank, the farad capacitor bank is electrically connected with the electric pulse forming module, the capacitance equalizing charge module carries out equalizing charge on the farad capacitor bank, and the electric pulse forming module controls the farad capacitor bank to carry out pulse output.

Wherein: the constant-power two-way output switch power supply is electrically connected with the temperature sensing element.

Wherein: and the output end of the capacitance equalizing charging module is also provided with a sampling resistor for sampling and detecting the current value by the constant current controller.

Wherein: the microchip pulse parameter controller is respectively connected with a direct current voltage reduction constant current module, a constant current controller, a constant voltage controller and an electric pulse forming module and a constant power two-way output switching power supply in the capacitive resistance welding device in the capacitance equalizing charging module in an associated mode.

A capacitance independent balance management method of a super farad capacitance type resistance welder comprises the following steps:

A. a constant current charging stage, wherein when the constant voltage controller detects that the capacitor voltage is closer to 0 volt, the capacitor charge is extremely small, the internal resistance is extremely small, if the capacitor is charged, the capacitor is in a short circuit state, and in order to prevent the capacitor from being in the short circuit state during charging, the constant current controller for detecting the sampling resistor controls the charging current to perform the constant current charging stage on the capacitor;

B. and in the constant voltage charging stage, when the constant voltage controller detects that the capacitor voltage is closer to the rated voltage, the capacitor charge of the constant voltage controller is gradually increased, the charging voltage is gradually increased, and the charging current is gradually reduced, so that the direct current voltage reduction constant current module stops charging.

Wherein: the constant current controller is used for detecting whether the current at the two ends of the sampling resistor is in a constant value or not, so that the direct current voltage reduction constant current module is in a voltage reduction constant current stage, the capacitor equalizing charging module adjusts the voltage or the current, and the direct current voltage reduction constant current module and the farad capacitor set are prevented from being damaged.

The invention has the beneficial effects that: the capacitive resistance welding device comprises an anode welding arm, a cathode welding arm, a farad capacitor group connected in series between the anode welding arm and the cathode welding arm, and an electric pulse forming module connected in series between the cathode welding arm and the farad capacitor group, wherein the farad capacitor group comprises a first farad capacitor and a second farad capacitor which are connected in series, the first farad capacitor and the second farad capacitor are respectively connected with a capacitor equalizing charging module in parallel, and the capacitor equalizing charging module comprises a direct current voltage reduction 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 uniformly charged, so that a good charge balance effect is obtained, the farad capacitor group connected in series is charged with the maximum stored energy and the balance effect of two capacitor potentials in a short time, and the extreme problem that the single capacitor in the farad capacitor group is possibly damaged due to different potential voltages of the capacitor units when the farad capacitor group is charged in series is solved.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic structural diagram of a capacitive resistance welding device according to the present invention;

FIG. 2 is a schematic diagram of the operating circuit of the constant power dual output switching power supply and equalizing charge module of the present invention;

FIG. 3 is a schematic circuit diagram of an equalizing charge module according to the present invention;

FIG. 4 is a schematic circuit diagram of a capacitive resistance welding device according to the present invention;

FIG. 5 is a schematic diagram of the capacitor charging and discharging circuit of the present invention;

FIG. 6 is a partial cross-sectional structural schematic of the present invention;

FIG. 7 is another schematic view, partly in section, of the present invention;

FIG. 8 is a schematic diagram of the logic relationship of the microchip pulse parameter controller of the present invention;

fig. 9 is a schematic diagram of mode selection of the present invention.

Detailed Description

Referring to fig. 1 to 9, a super farad capacitive resistance welder includes a box 111, a capacitive resistance welding device 5, two sets of one-way capacitance equalizing charging modules 1 connected to the capacitive resistance welding device 5, a constant power two-way output switching power supply 8 respectively connected to the two sets of capacitance equalizing charging modules 1, and a microchip pulse parameter controller 9 controlling the capacitive resistance welding device 5 are disposed in the box 111, wherein the capacitive resistance welding device 5 includes an anode welding arm 52, a cathode welding arm 53, a farad capacitor bank 54 connected in series between the anode welding arm 52 and the cathode welding arm 53, and at least one electric pulse forming module 55 connected in series between the cathode welding arm 53 and the farad capacitor bank 54, the farad capacitor bank 54 includes a first farad capacitor 541 and a second farad capacitor 542 connected in series, and the

first farad capacitor

541, 542 are connected in series, The second farad capacitor 542 is respectively connected with a capacitor equalizing charge module 1 in parallel and in one-way connection, wherein the capacitor equalizing charge module 1 comprises a direct current step-down constant current module 11 in one-way connection with the constant power two-way 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 capacitance equalizing charging module 1 and the constant-power two-way output switching power supply 8 are all connected with the microchip pulse parameter controller 9.

The microchip pulse parameter controller 9 is respectively connected to the direct current step-down constant current module 11, the constant current controller 12, the constant voltage controller 13 in the capacitance equalizing charging module 1, the electric pulse forming module 55 in the capacitance resistance welding device 5, and the constant power two-way output switching power supply 8.

In the present invention, a series conductor 56 connecting the first farad capacitor 541 and the second farad capacitor 542 is provided between the farad capacitor groups 54. A negative electrode conductor 57 is arranged between the electric pulse forming module 55 and the first farad capacitor 541 in series, and the negative electrode conductor 57 is fixedly connected with the first farad capacitor 541. The electric pulse forming module 55 is disposed at the bottom of the negative conductor 57 and perpendicular to the negative conductor 57. The electric pulse forming module 55 attached to the farad capacitor bank 54 is easy to install and replace.

The capacitance equalizing charge module 1 is electrically connected with a farad capacitor group 54, the farad capacitor group 54 is electrically connected with an electric pulse forming module 55, wherein the capacitance equalizing charge module 1 performs equalizing charge on the farad capacitor group 54, and the electric pulse forming module 55 controls the farad capacitor group 54 to perform pulse output.

The constant voltage controller 13 controls 2.7V constant voltage output, 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 with the welding pin 51. Wherein the capacitance equalizing charging module 1 is also provided with a sampling resistor 15, the constant current controller 12 is used for detecting the current values at the two ends of the setting position 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, the output end of the capacitance equalizing charging module 1 is also provided with a current limiting resistor 18, the current limiting resistor 18 is connected with the sampling resistor 15 in series, wherein a temperature protection module with the temperature protection set to be 85 ℃ is arranged in the constant-power two-way output switching power supply 8, the capacitive resistance welding device 5, the capacitance equalizing charging module 1 and the constant-power two-way output switching power supply 8 are all connected with the microchip pulse parameter controller 9, wherein, the microchip pulse parameter controller 9 controls and outputs pulse signals with different time widths of 0.5-10 ms, so that the capacitive resistance welding device 5 outputs pulses in different time periods.

The first farad capacitor 541 and the second farad capacitor 542 adopt a 2.7V/3000F super farad capacitor, the first farad capacitor 541 and the second farad capacitor 542 are connected in series and by a conductor of a micro resistor, namely are connected through a series conductor 56, so that the super capacitor module with the rated voltage of 5.4V/1500F, the ultra-low internal resistance of less than or equal to 0.5m omega and the super energy of more than or equal to 21000 joules is realized, and the maximum short-circuit current can reach 10800A. The output energy and the output current are ideal power supplies for pulse resistance welding.

The electric pulse forming module 55 is vertically arranged at the edge of the negative electrode conductor 57 in a short distance, so that the voltage drop loss caused by the connection of capacitance pulse current through a lead is avoided, and meanwhile, the electric pulse forming module 55 is arranged at the bottom of the negative electrode conductor 57 and is convenient to disassemble and replace.

The pulse voltage and the welding power which accord with resistance type welding are achieved through the series voltage of the farad capacitor group 54, and the welding effect is better due to large instantaneous power; the first farad capacitor 541 and the second farad capacitor 542 are respectively and independently connected with the capacitor equalizing charging module 1 in parallel, each farad capacitor is independently managed, and the potential difference of each farad capacitor is detected through the constant voltage controller 13 to judge whether the capacitor is fully loaded with charges; meanwhile, the constant current controller 12 is used for controlling to avoid a charging short circuit state that the voltage of the capacitor is zero when no charge exists, so that the direct current voltage reduction constant current module 11 is protected from safe output, and the overcurrent charging of the farad capacitor is avoided.

The electric pulse forming module 55 is composed of an array parallel connection composed of metal oxide semiconductor field effect devices with ultra-large current capacity and low internal resistance and a special high-speed driving chip. The electric pulse forming module 55 is designed to be an ultra-low loss metal conductor component and direct nondestructive brazing of the metal oxide semiconductor field effect device array into a whole, solves the assembly process contradiction between the metal oxide semiconductor field effect device and the large-current metal conductor and the small-signal high-speed driving chip, and realizes the low-loss formation and output of the small-signal high-speed driving and the control of the huge pulse current by respectively using carriers between the metal oxide semiconductor field effect device and the large-current metal conductor and the small-signal high-speed driving chip.

The capacitance equalizing charge module 1 takes a high-performance (DC-DC) conversion module as a core, and is designed such that two independent channels perform balanced charge on a first farad capacitor 541 and a second farad capacitor 542 which are connected in series, the capacitance equalizing charge module 1 of each channel (CH1/CH2) generates a constant voltage of 2.7V and a constant current of up to 12A, and the connected first farad capacitor 541 and the second farad capacitor 542 are charged in parallel independently. The super capacitor single body rapid charging management system comprises a capacitor equalizing charging module 1, a peripheral constant voltage control circuit, a constant current control circuit and a temperature protection circuit, and aims to realize a rapid charging management mode in two stages of a constant current charging stage and a constant voltage charging stage of a super capacitor single body.

Moreover, the temperature protection value is set to 85 ℃ on the substrate in the capacitor equalizing charge module 1, so that the safety and reliability of the capacitor equalizing charge module 1 during large-current output charging are ensured. The capacitor equalizing charge module 1 has the advantages that two parameters are consistent, the channels are independent, the first farad capacitor 541 and the second farad capacitor 542 which are connected in series are respectively charged in parallel and balanced, independent charging and management of the super capacitor are realized, a good charge equalizing effect is obtained, the equalizing effect of maximum stored energy and two capacitor potentials is achieved in a short time for the farad capacitor group 54 which is connected in series, and the problem that the single capacitor is damaged due to the difference of the potential and the voltage of the capacitor when the farad capacitor group 54 which is connected in series is charged in series is solved.

Because the capacitance equalizing charge module 1 respectively charges the farad capacitor group 54 in a balanced manner by two channels, and the farad capacitor group 54 formed by the first farad capacitor 541 and the second farad capacitor 542 is connected in a series connection manner, the constant-power two-way output switching power supply 8 realizes the voltage reduction supply of the mains supply and converts the voltage reduction supply into a two-way independent output structure, so that the two-way independent power supply is used as the independent power supply of the capacitance equalizing charge module 1; in addition, in order to prevent the power supply short circuit caused by the damage of the super capacitor, the constant power two-way output switch power supply 8 is designed to be in a constant power mode, and simultaneously has the function of protecting the farad capacitor group 54 from temperature abnormality, so that the working operation safety of the farad capacitor group 54 is improved, and the temperature protection is formed by attaching the temperature sensing elements 14 with the detection temperature of 65 ℃ to the shells of the first farad capacitor 541 and the second farad capacitor 542.

The microchip pulse parameter controller 9 is composed of a hardware MCU, a peripheral electronic circuit and software programming, is used for setting and controlling the output of pulse signals with different time widths of 0.5-10 milliseconds, and simultaneously has the functions of discharge minimum interval protection, low-capacitance electric quantity discharge protection, pulse current detection display, capacitance module voltage detection display and workpiece loop abnormal discharge alarm.

The microchip pulse parameter controller 9 is designed by software to achieve the purpose of improving the welding reliability, and simultaneously, the difficulty of setting parameters in operation is reduced.

The capacitive resistance welding device 5 and the capacitance equalizing charge module 1 are both connected with the box body 111, and the capacitive resistance welding device 5 and the capacitance equalizing charge module 1 are both arranged in the box body 111. The box body 111 is internally provided with a fixed frame 7, the capacitive resistance welding device 5 is connected with the fixed frame 7 and extends out of the box body 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, the downward stepping linkage mechanism is provided with a downward pull trigger switch 622, and the capacitive resistance welding device 5 is fixedly provided with a welding needle 51. The microchip pulse parameter controller 9 is connected with an up-push trigger switch 621 and a down-pull trigger switch 622 to determine the welding direction.

The pressure regulator comprises a first spring group 721, a second spring group 722 and an adjusting end 723, wherein the first spring group 721, the second spring group 722 and the adjusting end 723 are arranged on the fixing frame 7 and are used for adjusting tightness of the first spring group 721 and the second spring group 722, and the adjusting end 723 comprises an adjusting screw 724 and a connecting module 725 for connecting the adjusting screw 724 with the first spring group 721. Wherein the first spring set 721 and the second spring set 722 make the position of the welding head 5 reach a horizontal balance state.

The upward following mechanism includes a first force transmission end 611a abutting against the capacitive resistance welding device 5, a moving frame 612 fixedly disposed with the first force transmission end 611a, a linkage bar 613 fixed with the moving frame 612, and an upward pushing abutting end 623 disposed on the linkage bar 613 and cooperating with the upward pushing trigger switch 621 to perform a switching operation.

The downward stepping linkage mechanism comprises a first force transmission end 611a which abuts against the capacitive resistance welding device 5, a movable frame 612 which is fixedly arranged with the first force transmission end 611a, a linkage bar 613 which is fixed with the movable frame 612, and a downward pulling abutting end 624 which is arranged on the linkage bar 613 and is matched with a downward pulling trigger switch 622 to perform switching operation, wherein the tail end of the linkage bar 613 is connected with a pedal linkage device which can perform downward pulling on the linkage bar by a pedal, the movable frame 612 is provided with a second force transmission end 611, and the second force transmission end 611 is connected with the fixed frame 7. The first force transmission end 611a and the second force transmission end 611 transmit the direction of the pushing-up or pushing-down force.

Wherein the foot pedal linkage includes a pedal 631 and an extension post 632 connecting the pedal 631 with the linkage bar 613. The foot pedal 631 pulls the extending post 632 to drive the linkage bar 613 to complete the downward-stepping linkage.

The first spring group 721 and the second spring group 722 are provided to restore the original position of the capacitive resistance welding device 5 after the capacitive resistance welding device 5 is pushed up or down, and the pressure and angle of the capacitive resistance welding device 5 can be controlled by adjusting the degree of the adjusting screw 724 entering the fixing frame 7. After the capacitive resistance welding device 5 is pulled up, the extension column 632 is pushed to drive the linkage bar 613 to move upwards, so that the push-up abutting end 623 moves upwards to touch the push-up trigger switch 621 to perform spot welding operation, and the capacitive resistance welding device 5 returns to the original position after welding is completed because the pressure regulator has pulling force.

One side of the fixed frame 7 is provided with a limiting strip 73 for preventing the movable frame 612 from coming off.

A middle layer clamping plate 71 is arranged in the fixed frame 7, and the capacitive resistance welding device 5 is hinged with the side edge of the fixed frame 7. The positive electrode welding arm 52 and the negative electrode welding arm 53 are both movable up and down.

The moving frame 612 is provided with a second force transmission end 611, and the second force transmission end 611 is connected with the fixed frame 7.

By pushing up the capacitive resistance welding device 5 or pushing down the capacitive resistance welding device 5 to the extreme, the microchip pulse parameter controller 9 is caused to select the push-up welding mode or the lower pedal welding mode at the same time.

If the push-up welding mode is selected, the weldment is held and is touched with the welding pin 51, the capacitive resistance welding device 5 is pushed up by applying force after the welding pin 51 is touched, the capacitive resistance welding device 5 moves up to drive the first power transmission end 611a, the moving frame 612, the linkage bar 613 and the push-up abutting end 623 arranged on the linkage bar 613, the push-up abutting end 623 abuts against the push-up trigger switch 621, and the microchip pulse parameter controller 9 receives a signal from the push-up trigger switch 621 and then controls the electric pulse forming module 55 to transmit current to the capacitive resistance welding device 5, the welding pin 51 and the weldment to be welded.

If the pedal-down welding mode is selected, the weldment is placed, the capacitor type resistance welding device 5 is pressed down by driving the pedal 631 to press down, the pull-down abutting end 624 is driven to abut against the pull-down trigger switch 622, and the microchip pulse parameter controller 9 receives a signal from the pull-down trigger switch 622 and then controls the electric pulse forming module 55 to deliver current to the capacitor type resistance welding device 5, the welding needle 51 and the weldment for welding.

A. a constant current charging stage, in which when the constant voltage controller 13 detects that the capacitor voltage is closer to 0 volt, the capacitor charge is extremely small, the internal resistance is extremely small, if the capacitor is short-circuited, in order to prevent the capacitor from being in a short-circuit state during charging, the constant current controller 12 for detecting the sampling resistor 15 controls the charging current to perform the constant current charging stage on the capacitor;

in this case, during the constant current charging phase, the charging circuit is a pure resistance circuit, and according to ohm's law, at rated power, the charging current increases as the capacitor voltage increases and decreases as the capacitor voltage decreases.

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 of the capacitor gradually increases, the charging voltage gradually increases, and the charging current gradually decreases, so that the charging of the dc step-down constant current module 11 is stopped.

The constant current controller 12 is configured to detect whether the current at the two 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 equalizing charge module 1 adjusts the voltage or the current, thereby avoiding damage to the dc step-down constant current module 11 and the faraday capacitor group 54.

Still further, balance charging is performed on the first farad capacitor 541 and the second farad capacitor 542, wherein the first farad capacitor 541 and the second farad capacitor 542 are arranged in series, the constant-power two-way output switching power supply 8 isolates and reduces the mains supply to direct current 12V and respectively conveys the direct current to each capacitor equalization charging module 1, and each capacitor equalization charging module 1 respectively performs balance charging on the first farad capacitor 541 and the second farad capacitor 542.

Next, the capacitance equalizing charge 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 two-way output switching power supply 812V into a constant voltage of 2.7V and a constant current output by 12A, and independently charges the connected first farad capacitor 541 or second farad capacitor 542 in parallel.

The constant current controller 12 controls the constant current charging stage and the constant voltage charging stage of the first farad capacitor 541 or the second farad capacitor 542 in correspondence with the constant voltage controller 13.

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 with the constant power two-way output switching power supply 8, the temperature peak value of the temperature sensing element 14 is set to 65 ℃, and shutdown protection processing is performed when the temperature is exceeded.

In the present invention: the capacitive resistance welding device 5 comprises an anode welding arm 52, a cathode welding arm 53, a farad capacitor group 54 connected in series between the anode welding arm 52 and the cathode welding arm 53, and an electric pulse forming module 55 connected in series between the cathode welding arm 53 and the farad capacitor group 54, wherein 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 equalizing charging module 1, and the capacitor equalizing charging module 1 comprises a direct current voltage reduction 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 uniformly charged, so that a good charge balance effect is obtained, the farad capacitor group 54 connected in series is charged with the maximum stored energy and the balance effect of the two capacitor potentials in a short time, and the extreme problem that the single capacitor in the farad capacitor group 54 is possibly damaged due to the fact that the capacitor single potential voltage is different when the farad capacitor group 54 is charged in series is solved.

Claims

1. A super farad capacitive resistance welder, includes box (111), its characterized in that: the box body (111) is internally provided with a capacitive resistance welding device (5), two groups of one-way capacitance equalizing charging modules (1) connected with the capacitive resistance welding device (5), a constant-power two-way output switching power supply (8) respectively connected with the two groups of capacitance equalizing 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 an anode welding arm (52), a cathode welding arm (53), a farad capacitor group (54) connected in series between the anode welding arm (52) and the cathode welding arm (53), and at least one electric pulse forming module (55) connected in series between the cathode welding arm (53) and the farad capacitor group (54), the farad capacitor group (54) comprises a first capacitor (541) and a second capacitor (542) which are connected in series, the first farad capacitor (541) and the second farad capacitor (542) are respectively connected with a capacitance equalizing charging module (1) in parallel and in one-way connection, wherein the capacitance equalizing charging module (1) comprises a direct-current voltage-reducing constant-current module (11) in one-way connection with a constant-power two-way output switching power supply (8), a constant current controller (12) and a constant voltage controller (13) which are used for detecting the current of the single farad capacitor.

2. The super farad capacitive resistance welder according to claim 1, characterized in that: set up series conductor (56) of connecting first farad electric capacity (541), second farad electric capacity (542) between farad electric capacity group (54), electric pulse forms and establishes negative conductor (57) between module (55) and first farad electric capacity (541) in series, negative conductor (57) and first farad electric capacity (541) fixed connection, electric pulse forms module (55) and sets up in negative conductor (57) bottom and with negative conductor (57) mutually perpendicular setting.

3. The super farad capacitive resistance welder according to claim 1, characterized in that: the capacitance equalizing charge module (1) is electrically connected with a farad capacitor bank (54), the farad capacitor bank (54) is electrically connected with an electric pulse forming module (55), wherein the capacitance equalizing charge module (1) performs equalizing charge on the farad capacitor bank (54), and the electric pulse forming module (55) controls the farad capacitor bank (54) to perform pulse output.

4. The super farad capacitive resistance welder according to claim 1, characterized in that: the constant-power two-way output switching power supply (8) is electrically connected with the temperature sensing element (14).

5. The super farad capacitive resistance welder according to claim 1, characterized in that: and the output end of the capacitance equalizing charging module (1) is also provided with a sampling resistor (15) for sampling and detecting the current value by the constant current controller (12).

6. The super farad capacitive resistance welder according to claim 1, characterized in that: the microchip pulse parameter controller (9) is respectively connected with a direct current voltage reduction constant current module (11), a constant current controller (12), a constant voltage controller (13) in the capacitance equalizing charging module (1), an electric pulse forming module (55) in the capacitance resistance welding device (5) and a constant power two-way output switching power supply (8) in an associated mode.

7. A capacitance independent balance management method of a super farad capacitance type resistance welder is characterized by comprising the following steps:

A. a constant current charging stage, when the constant voltage controller (13) detects that the capacitor voltage is closer to 0 volt, the capacitor charge is extremely small, the internal resistance is extremely small, if the capacitor is charged, namely short circuit occurs, in order to prevent the capacitor from being in a short circuit state during charging, the constant current controller (12) for detecting the sampling resistor (15) controls the charging current, and the constant current charging stage is carried out on the capacitor;

B. and 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 is gradually increased, the charging voltage is gradually increased, and the charging current is gradually reduced, so that the direct current voltage reduction constant current module (11) stops charging.

8. The method of claim 7, wherein the method comprises the following steps: the constant current controller (12) is used for detecting whether the current at the two ends of the sampling resistor (15) is in a constant value or not, so that the direct current voltage reduction constant current module (11) is in a voltage reduction constant current stage, the capacitor equalizing charging module (1) adjusts the voltage or the current, and the direct current voltage reduction constant current module (11) and the pull capacitor group (54) are prevented from being damaged.