CN113458542A - Pedal type welding machine control circuit for IGBT inversion - Google Patents
Pedal type welding machine control circuit for IGBT inversion Download PDFInfo
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- CN113458542A CN113458542A CN202110751610.5A CN202110751610A CN113458542A CN 113458542 A CN113458542 A CN 113458542A CN 202110751610 A CN202110751610 A CN 202110751610A CN 113458542 A CN113458542 A CN 113458542A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention belongs to the technical field of inverter welding machine control, and provides an IGBT inverted pedal type welding machine control circuit, which comprises: a power input module; a drive control module; the inversion output module is used for inverting and outputting the input voltage obtained by the power input module according to the control signal generated by the driving control module to obtain the output current of the welding machine; and the pedal switch is provided with a potentiometer, the potentiometer is connected with a sixth pin of the drive control module, and the resistance value of the potentiometer is adjusted by pressing the pedal switch so as to change the output current of the welding machine. The invention has the advantages that the output current of the welding machine is controlled by adopting a pedal switch, so that an operator can continuously adjust the output current of the welding machine in the welding process to achieve better welding effect, and the output current of the welding machine is more accurate by selecting the PWM chip of SG 3525.
Description
Technical Field
The invention relates to the technical field of inverter welding machine control, in particular to a pedal type welding machine control circuit for IGBT inversion.
Background
The welding machine is an electric appliance which provides a power supply with certain characteristics for welding, and the welding machine is widely applied to various industrial fields such as aerospace, ships, automobiles, containers and the like due to the advantages of flexibility, simplicity, convenience, firmness and reliability and even equal strength with a base metal after welding.
At present, in domestic and foreign markets, the quantity of welding machines is large, and the application is wide. However, the quality of the welder is affected by many factors, such as circuit board design, control circuitry, manufacturing process, etc., which ultimately affect the market competitiveness of the product.
The control circuit design of the welding machine in the market at present can be carried out in an IGBT inversion mode, but the control circuit adopting the IGBT inversion mode is complex, so that the manufacturing process is complicated, the current output of the welding machine is not accurate enough, and the current required by welding can not be achieved sometimes.
In addition, in the practical process of welding machine, operating personnel often need to operate through handheld welder handheld welding wire, can't carry out accurate control to the welding current stool and urine among the welding process, can only carry out fixed regulation through the button on the welding machine before the welding operation for the welded accuracy is not high.
Disclosure of Invention
The invention aims to provide a pedal type welding machine control circuit for IGBT inversion, which is used for solving the problems;
in order to achieve the purpose, the invention adopts the technical scheme that:
a foot-operated welding machine control circuit of IGBT contravariant includes:
a power input module;
a drive control module;
the inversion output module is used for inverting and outputting the input voltage obtained by the power input module according to the control signal generated by the driving control module to obtain the output current of the welding machine;
the driving control module comprises a driving chip U7 and a first signal amplification unit connected with a ninth pin of the driving chip U7, and an eleventh pin and a fourteenth pin of the driving chip U7 are both connected with the inversion output module;
and the pedal switch is provided with a potentiometer, the potentiometer is connected with a sixth pin of the drive control module, and the resistance value of the potentiometer is adjusted by pressing the pedal switch so as to change the output current of the welding machine.
Further, the foot switch includes:
the top of the base is provided with a bracket and a through hole;
the pedal is fixedly connected with the bracket and forms a preset angle with the top surface of the base;
the gear rack subassembly, including rack and gear, the one end of rack is passed the through-hole with footboard fixed connection, the gear with base swing joint and through a logical axle with the potentiometre is connected, when the rack drives the gear rotatory, through the rotatory resistance that changes the potentiometre of logical axle.
Further, the inverter output module comprises a MOS transistor VT7, a MOS transistor VT8, a MOS transistor VT9, a MOS transistor VT10, a resistor R30, a capacitor C24, a signal output chip U8 and an IGBT transistor;
the grid electrode of the MOS tube VT7 is connected with the eleventh pin of the driving chip U7, the source electrode of the MOS tube VT7 is connected with the drain electrode of the MOS tube VT7, and the drain electrode of the MOS tube VT7 is connected with the power supply; the grid electrode of the MOS tube VT8 is connected with the eleventh pin of the driving chip U7, the source electrode of the MOS tube VT8 is connected with the drain electrode of the MOS tube VT10, and the drain electrode of the MOS tube VT8 is connected with the power supply; the gate of the MOS transistor VT9 is connected to the fourteenth pin of the driver chip U7, and the source of the MOS transistor VT9 is grounded; the gate of the MOS transistor VT10 is connected to the fourteenth pin of the driver chip U7, and the source of the MOS transistor VT10 is grounded; the source of the MOS tube VT7 is also connected with the input end of the signal output chip U8, the source of the MOS tube VT8 is also connected with the input end of the signal output chip U8 through a resistor R30, a capacitor C24 is connected in parallel at two ends of the resistor R30, and the output end of the signal output chip U8 is connected with an IGBT tube.
Further, a second signal amplification unit is further arranged between the driving chip U7 and the inverter output module, and the second signal amplification unit includes: the circuit comprises a triode Q7, a triode Q5, a diode Z3, a capacitor C4, a resistor R7, a diode D1, a triode Q6, a triode Q8, a diode Z4, a capacitor C5, a resistor R8, a diode D2, a resistor R23 and a resistor R22;
an eleventh pin of the driving chip U7 is connected to a base of a transistor Q7 and a base of a transistor Q5, a collector of the transistor Q7 is connected to a power supply, an emitter of the transistor Q7 is connected to an emitter of a transistor Q5 through a resistor R22, a collector of the transistor Q5 is grounded, an emitter of the transistor Q7 is further connected to an anode of a diode Z3, a cathode of the diode Z3 is connected to a gate of a MOS transistor VT7, a cathode of the diode Z3 is further connected to one end of a resistor R7, the other end of the resistor R7 is connected to a cathode of a diode D1, an anode of the diode D1 is connected to an input power supply, a capacitor C4 is connected to both ends of the diode Z3 in parallel, and an emitter of the transistor Q5 is connected to a gate of the MOS transistor VT 9;
a fourteenth pin of the driving chip U7 is connected to a base of the transistor Q6 and a base of the transistor Q8, a collector of the transistor Q6 is connected to the power supply, an emitter of the transistor Q6 is connected to an emitter of the transistor Q8 through a resistor R23, a collector of the transistor Q8 is grounded, an emitter of the transistor Q6 is further connected to an anode of the diode Z3, a cathode of the diode Z3 is connected to a gate of the MOS transistor VT8, a cathode of the diode Z3 is further connected to one end of a resistor R8, the other end of the resistor R8 is connected to a cathode of the diode D2, an anode of the diode D2 is connected to the input power supply, the capacitor C5 is connected to both ends of the diode Z3 in parallel, and an emitter of the transistor Q8 is connected to a gate of the MOS transistor VT 10.
And the feedback module is connected with a fourth pin of the drive control module and used for acquiring the output current value of the welding machine and sending the current value to the drive control module.
Further, the intelligent power supply also comprises a thermal switch unit, and the thermal switch unit is connected with an eighth pin of the driving chip U7.
Further, the electronic device further comprises an input power supply detection unit, and the input power supply detection unit is connected with an eighth pin of the driving chip U7.
Further, the power supply device further comprises an auxiliary power supply module, which is used for converting the input power supply, so that the converted input power supply can supply power to the driver chip U7.
Compared with the prior art, the invention at least comprises the following beneficial effects:
(1) the output current of the welding machine is controlled by adopting a pedal switch, so that an operator can continuously adjust the output current of the welding machine in the welding process, and a better welding effect is achieved;
(2) the output current of the welding machine is more accurate by selecting the PWM chip of SG 3525;
(3) the output current value can be obtained in real time through the output current feedback unit, and when the output current value cannot meet the welding requirement, a user is reminded to check and maintain in time;
(4) the temperature of the IGBT tube is detected through the thermosensitive switch unit, so that the whole circuit is prevented from being burnt out due to overhigh temperature of the IGBT tube in the welding process, and unnecessary damage is further caused to a user.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;
FIG. 2 is a first schematic view of a foot pedal according to an embodiment of the present invention;
FIG. 3 is a second schematic view of a foot pedal according to an embodiment of the present invention;
FIG. 4 is an overall circuit diagram of a power input module and a partial inverter output module according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of a drive control module and a portion of an inverter output module according to an embodiment of the present invention;
FIG. 6 is a circuit diagram of the interior of the drive control module in an embodiment of the present invention;
fig. 7 is a circuit diagram of an auxiliary power supply module in an embodiment of the invention.
Detailed Description
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
Moreover, descriptions of the present invention as relating to "first," "second," "a," etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating a number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1 to 4, the present invention provides a control circuit for IGBT inverter pedal welder, comprising: the power supply comprises a power supply input module, a drive control module, an inversion output module, a feedback module, an auxiliary power supply module and a foot switch.
The inversion output module is used for inverting and outputting the input voltage obtained by the power input module according to the control signal generated by the driving control module to obtain the output current of the welding machine; the feedback module is connected with a fourth pin of the drive control module and used for acquiring the output current value of the welding machine and sending the current value to the drive control module; the auxiliary power supply module is used for converting the input power supply, so that the converted input power supply can supply power for the drive control module. The pedal switch is provided with a potentiometer 6 which is connected with a sixth pin of the driving control module, and the output current of the welding machine is changed by pressing the pedal switch to adjust the resistance value of the potentiometer.
Wherein, foot switch includes base 1, footboard 2 and rack and pinion subassembly, and 1 top of base is provided with a support 3 and through-hole, footboard 2 and support 3 fixed connection, and be preset angle with the base top surface.
The rack and pinion subassembly includes rack 4 and gear 5, the through-hole is passed to the one end of rack 4 and is connected with footboard 2 fixed connection, gear 5 and base 1 swing joint just are connected with potentiometre 6 through a logical axle (not shown in the figure), when footboard 2 atress, the rack removes along vertical direction, it is rotatory to drive gear 5 through rack 4, and then the resistance through the rotatory potentiometre 6 that changes of logical axle, make operating personnel can constantly adjust the output current of welding machine in welding process, reach better welding effect.
As shown in fig. 5, the inverter output module includes a MOS transistor VT7, a MOS transistor VT8, a MOS transistor VT9, a MOS transistor VT10, a resistor R30, a capacitor C24, a signal output chip U8, and an IGBT.
The grid electrode of the MOS tube VT7 is connected with the eleventh pin of the driving chip U7, the source electrode of the MOS tube VT7 is connected with the drain electrode of the MOS tube VT7, and the drain electrode of the MOS tube VT7 is connected with the power supply; the grid electrode of the MOS tube VT8 is connected with the eleventh pin of the driving chip U7, the source electrode of the MOS tube VT8 is connected with the drain electrode of the MOS tube VT10, and the drain electrode of the MOS tube VT8 is connected with the power supply; the gate of the MOS transistor VT9 is connected to the fourteenth pin of the driver chip U7, and the source of the MOS transistor VT9 is grounded; the gate of the MOS transistor VT10 is connected to the fourteenth pin of the driver chip U7, and the source of the MOS transistor VT10 is grounded; the source of the MOS tube VT7 is also connected with the input end of the signal output chip U8, the source of the MOS tube VT8 is also connected with the input end of the signal output chip U8 through a resistor R30, a capacitor C24 is connected in parallel at two ends of the resistor R30, and the output end of the signal output chip U8 is connected with an IGBT tube.
The driving signal sent by the driving control module is amplified by the MOS tube VT7, the MOS tube VT8, the MOS tube VT9 and the MOS tube VT10 and then output to the IGBT tube through the signal output chip U8, and the on-off of the IGBT tube is adjusted through the PWM wave output by the driving control module, so that the intermittent oscillation frequency is low and the pulse width is narrow, and thus, the no-load loss is small, and the transformer is not easy to saturate. Due to the adoption of the control technology taking Pulse Width Modulation (PWM) as a core, better constant current characteristic and excellent welding process effect can be obtained.
As shown in fig. 5 and 6, the driving control module includes a driving chip U7, a first signal amplifying unit, a second signal amplifying unit and a signal detecting unit, and the model of the driving chip is SG3525AJ (16).
The first signal amplification unit comprises a resistor R2, a light emitting diode LED1, a light emitting diode LED2, a resistor R10, a capacitor C3, a resistor R19, a capacitor C6, a resistor R17, a resistor R3, a resistor R24, an operational amplifier U2, a capacitor C11, a resistor R9, a resistor R1, a resistor R25, a resistor R29, a capacitor C10, a diode D4, a triode Q4, a capacitor C9, a capacitor C7, a resistor R20, a capacitor C1, a resistor R4, a resistor R13, a resistor R14, a capacitor C12, a resistor R26, a resistor R11, a triode Q9 and a resistor R27.
One end of the resistor R3 is connected with the potentiometer, and the output end of the operational amplifier is connected with the ninth pin of the driving chip U7.
The output current of the welding machine is adjusted through the potentiometer, after the resistance value of the potentiometer changes, the signal of the operational amplifier U2 is amplified, the driving chip U7 knows the adjustment condition of a user, and then the output frequency of the PWM wave is changed, so that the output current value of the welding machine changes.
Still be provided with second signal amplification unit between driver chip U7 and the contravariant output module is connected, second signal amplification unit includes: the circuit comprises a triode Q7, a triode Q5, a diode Z3, a capacitor C4, a resistor R7, a diode D1, a triode Q6, a triode Q8, a diode Z4, a capacitor C5, a resistor R8, a diode D2, a resistor R23 and a resistor R22;
an eleventh pin of the driving chip U7 is connected to a base of a transistor Q7 and a base of a transistor Q5, a collector of the transistor Q7 is connected to a power supply, an emitter of the transistor Q7 is connected to an emitter of a transistor Q5 through a resistor R22, a collector of the transistor Q5 is grounded, an emitter of the transistor Q7 is further connected to an anode of a diode Z3, a cathode of the diode Z3 is connected to a gate of a MOS transistor VT7, a cathode of the diode Z3 is further connected to one end of a resistor R7, the other end of the resistor R7 is connected to a cathode of a diode D1, an anode of the diode D1 is connected to an input power supply, a capacitor C4 is connected to both ends of the diode Z3 in parallel, and an emitter of the transistor Q5 is connected to a gate of the MOS transistor VT 9;
a fourteenth pin of the driving chip U7 is connected to a base of the transistor Q6 and a base of the transistor Q8, a collector of the transistor Q6 is connected to the power supply, an emitter of the transistor Q6 is connected to an emitter of the transistor Q8 through a resistor R23, a collector of the transistor Q8 is grounded, an emitter of the transistor Q6 is further connected to an anode of the diode Z3, a cathode of the diode Z3 is connected to a gate of the MOS transistor VT8, a cathode of the diode Z3 is further connected to one end of a resistor R8, the other end of the resistor R8 is connected to a cathode of the diode D2, an anode of the diode D2 is connected to the input power supply, the capacitor C5 is connected to both ends of the diode Z3 in parallel, and an emitter of the transistor Q8 is connected to a gate of the MOS transistor VT 10.
The PWM wave output by the driving chip U7 enables the triode to be switched on or switched off, and higher voltage PWM wave output is generated.
As shown in fig. 5 and 6, the signal detection unit includes a diode Z1, a resistor R5, a thyristor Q1, a diode D3, a diode Z2, a resistor R21, a resistor R12, a capacitor C8, a resistor R6, a transistor Q2, and a transistor Q3.
The anode of the diode Z1 is connected with the input power supply detection unit, the cathode of the diode D3 is connected with the thermal switch unit, the working state of the power supply of the welding machine is judged by collecting the value of the input power supply, the current output of the welding machine is further controlled, and accidents are prevented; the temperature information of the IGBT is collected by the thermosensitive switch unit and fed back to the driving chip U7, so that the driving chip U7 can control the output current in time and protect the whole circuit.
As shown in fig. 5 and 6, the feedback module includes a resistor R21, an interface CON6, a resistor R37, a capacitor C33, a capacitor C32, a diode Z6, and a capacitor C31. The current output end of contravariant output module is connected to interface CON 6's input, interface CON 6's output port 1 passes through resistance R9 and is connected with operational amplifier's second pin, output current feedback unit sends the output current of gathering to driver chip U7's ninth pin behind operational amplifier, driver chip U7 can adjust the output frequency of PWM ripples according to the output current size of gathering, and then the output current value that makes the welding machine is more accurate.
As shown in fig. 7, the auxiliary power module includes a resistor R73, a resistor R74, a resistor R75, a capacitor C46, a diode D17, an interface 626, a capacitor C44, a resistor R68, a resistor R67, a resistor R69, a transformer T2-2, a diode D19, a capacitor C50, a transformer T2-1, a diode D19, and a capacitor C48.
And a power supply is output from a P1 port, a 24V power supply is obtained through a transformer T2-1 and is used for driving inversion of an IGBT (insulated gate bipolar transistor) tube, and a 12V power supply is also obtained through a transformer T2-2 and is used for supplying power for a driving chip U7.
The invention adopts the pedal switch to control the output current of the welding machine, so that an operator can continuously adjust the output current of the welding machine in the welding process, and a better welding effect is achieved; the output current of the welding machine is more accurate by selecting the PWM chip of SG 3525; the output current value can be obtained in real time through the output current feedback unit, and when the output current value cannot meet the welding requirement, a user is reminded to check and maintain in time; the temperature of the IGBT tube is detected through the thermosensitive switch unit, so that the whole circuit is prevented from being burnt out due to overhigh temperature of the IGBT tube in the welding process, and unnecessary damage is further caused to a user.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (8)
1. The utility model provides a foot-operated welding machine control circuit of IGBT contravariant which characterized in that includes:
a power input module;
a drive control module;
the inversion output module is used for inverting and outputting the input voltage obtained by the power input module according to the control signal generated by the driving control module to obtain the output current of the welding machine;
the driving control module comprises a driving chip U7 and a first signal amplification unit connected with a ninth pin of the driving chip U7, and an eleventh pin and a fourteenth pin of the driving chip U7 are both connected with the inversion output module;
and the pedal switch is provided with a potentiometer, the potentiometer is connected with a sixth pin of the drive control module, and the resistance value of the potentiometer is adjusted by pressing the pedal switch so as to change the output current of the welding machine.
2. The control circuit of welder by IGBT inversion according to claim 1, characterized in that the foot switch comprises:
the top of the base is provided with a bracket and a through hole;
the pedal is fixedly connected with the bracket and forms a preset angle with the top surface of the base;
the gear rack subassembly, including rack and gear, the one end of rack is passed the through-hole with footboard fixed connection, the gear with base swing joint and through a logical axle with the potentiometre is connected, when the rack drives the gear rotatory, through the rotatory resistance that changes the potentiometre of logical axle.
3. The IGBT inversion pedal type welder control circuit according to claim 1, wherein the inversion output module comprises a MOS transistor VT7, a MOS transistor VT8, a MOS transistor VT9, a MOS transistor VT10, a resistor R30, a capacitor C24, a signal output chip U8 and an IGBT transistor;
the grid electrode of the MOS tube VT7 is connected with the eleventh pin of the driving chip U7, the source electrode of the MOS tube VT7 is connected with the drain electrode of the MOS tube VT7, and the drain electrode of the MOS tube VT7 is connected with the power supply; the grid electrode of the MOS tube VT8 is connected with the eleventh pin of the driving chip U7, the source electrode of the MOS tube VT8 is connected with the drain electrode of the MOS tube VT10, and the drain electrode of the MOS tube VT8 is connected with the power supply; the gate of the MOS transistor VT9 is connected to the fourteenth pin of the driver chip U7, and the source of the MOS transistor VT9 is grounded; the gate of the MOS transistor VT10 is connected to the fourteenth pin of the driver chip U7, and the source of the MOS transistor VT10 is grounded; the source of the MOS tube VT7 is also connected with the input end of the signal output chip U8, the source of the MOS tube VT8 is also connected with the input end of the signal output chip U8 through a resistor R30, a capacitor C24 is connected in parallel at two ends of the resistor R30, and the output end of the signal output chip U8 is connected with an IGBT tube.
4. The IGBT inversion foot-operated welding machine control circuit according to claim 3, wherein a second signal amplification unit is further arranged between the connection of the driving chip U7 and the inversion output module, and the second signal amplification unit comprises: the circuit comprises a triode Q7, a triode Q5, a diode Z3, a capacitor C4, a resistor R7, a diode D1, a triode Q6, a triode Q8, a diode Z4, a capacitor C5, a resistor R8, a diode D2, a resistor R23 and a resistor R22;
an eleventh pin of the driving chip U7 is connected to a base of a transistor Q7 and a base of a transistor Q5, a collector of the transistor Q7 is connected to a power supply, an emitter of the transistor Q7 is connected to an emitter of a transistor Q5 through a resistor R22, a collector of the transistor Q5 is grounded, an emitter of the transistor Q7 is further connected to an anode of a diode Z3, a cathode of the diode Z3 is connected to a gate of a MOS transistor VT7, a cathode of the diode Z3 is further connected to one end of a resistor R7, the other end of the resistor R7 is connected to a cathode of a diode D1, an anode of the diode D1 is connected to an input power supply, a capacitor C4 is connected to both ends of the diode Z3 in parallel, and an emitter of the transistor Q5 is connected to a gate of the MOS transistor VT 9;
a fourteenth pin of the driving chip U7 is connected to a base of the transistor Q6 and a base of the transistor Q8, a collector of the transistor Q6 is connected to the power supply, an emitter of the transistor Q6 is connected to an emitter of the transistor Q8 through a resistor R23, a collector of the transistor Q8 is grounded, an emitter of the transistor Q6 is further connected to an anode of the diode Z3, a cathode of the diode Z3 is connected to a gate of the MOS transistor VT8, a cathode of the diode Z3 is further connected to one end of a resistor R8, the other end of the resistor R8 is connected to a cathode of the diode D2, an anode of the diode D2 is connected to the input power supply, the capacitor C5 is connected to both ends of the diode Z3 in parallel, and an emitter of the transistor Q8 is connected to a gate of the MOS transistor VT 10.
5. The IGBT inversion pedal type welding machine control circuit according to claim 1, further comprising a feedback module connected to a fourth pin of the drive control module and used for obtaining an output current value of the welding machine and sending the current value to the drive control module.
6. The IGBT inverting foot-operated welder control circuit according to claim 1, further comprising a thermal switch unit, wherein the thermal switch unit is connected with an eighth pin of the driving chip U7.
7. The IGBT inversion foot-operated welding machine control circuit according to claim 1, further comprising an input power detection unit, wherein the input power detection unit is connected with an eighth pin of the driving chip U7.
8. The IGBT inversion pedal welder control circuit according to claim 1, further comprising an auxiliary power module for converting an input power so that the converted input power can supply power to the driving chip U7.
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