CN113458542B - IGBT inversion pedal welding machine control circuit - Google Patents
IGBT inversion pedal welding machine control circuit Download PDFInfo
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- CN113458542B CN113458542B CN202110751610.5A CN202110751610A CN113458542B CN 113458542 B CN113458542 B CN 113458542B CN 202110751610 A CN202110751610 A CN 202110751610A CN 113458542 B CN113458542 B CN 113458542B
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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 a pedal welding machine control circuit for IGBT inversion, 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 drive control module to obtain the output current of the welding machine; the foot switch is provided with a potentiometer, the potentiometer is connected with a sixth pin of the drive control module, and the resistance of the potentiometer is adjusted by stepping on the foot switch so that the output current of the welding machine is changed. The invention has the advantages that the pedal switch is adopted 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 to achieve better welding effect, and the output current of the welding machine is more accurate by selecting the PWM modulation chip of SG 3525.
Description
Technical Field
The invention relates to the technical field of inverter welding machine control, in particular to a pedal welding machine control circuit for IGBT inversion.
Background
The welding machine is an electric appliance for providing a power supply with certain characteristics for welding, and the welding is widely applied to various industrial fields such as aerospace, ships, automobiles, containers and the like due to the advantages of flexibility, convenience, firmness and reliability, and even equal strength with a base metal after welding.
At present, in the markets at home and abroad, the sales of the welding machine is large, and the application is wide. The quality of the welder can be affected by many factors, such as circuit board design, control circuitry, manufacturing processes, etc., which ultimately can affect the market competitiveness of the product.
The control circuit design in the welding machine in the current market is carried out in an IGBT inversion mode, but the control circuit for selecting IGBT inversion is complex, so that the manufacturing process is complex, the current output of the welding machine is not accurate enough, and sometimes the current required by welding cannot be achieved.
In addition, in the practical process of the welding machine, an operator often needs to operate through a handheld welding gun and a handheld welding wire, so that the welding current in the welding process cannot be accurately controlled, and the welding current can only be fixedly adjusted through a button on the welding machine before the welding operation, so that the welding accuracy is not high.
Disclosure of Invention
The invention aims to provide a pedal welding machine control circuit for IGBT inversion, which is used for solving the problems;
in order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a foot-operated welder control circuit for IGBT inversion, comprising:
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 drive control module to obtain the output current of the welding machine;
the driving control module comprises a driving chip U7 and a first signal amplifying 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;
the foot switch is provided with a potentiometer, the potentiometer is connected with a sixth pin of the drive control module, and the resistance of the potentiometer is adjusted by stepping on the foot switch so that the output current of the welding machine is changed.
Further, the foot switch includes:
the base is provided with a bracket and a through hole at the top;
the pedal is fixedly connected with the bracket and forms a preset angle with the top surface of the base;
the rack and pinion assembly comprises a rack and a pinion, one end of the rack penetrates through the through hole and is fixedly connected with the pedal, the pinion is movably connected with the base and is connected with the potentiometer through a through shaft, and when the rack drives the pinion to rotate, the resistance of the potentiometer is changed through rotation of the through shaft.
Further, the inversion output module comprises a MOS tube VT7, a MOS tube VT8, a MOS tube VT9, a MOS tube VT10, a resistor R30, a capacitor C24, a signal output chip U8 and an IGBT tube;
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 a 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 a power supply; the grid electrode of the MOS tube VT9 is connected with the fourteenth pin of the driving chip U7, and the source electrode of the MOS tube VT9 is grounded; the grid electrode of the MOS tube VT10 is connected with the fourteenth pin of the driving chip U7, and the source electrode of the MOS tube VT10 is grounded; the source electrode of the MOS tube VT7 is also connected with the input end of the signal output chip U8, the source electrode 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 at two ends of the resistor R30 in parallel, and the output end of the signal output chip U8 is connected with an IGBT tube.
Further, a second signal amplifying unit is further disposed between the connection of the driving chip U7 and the inversion output module, and the second signal amplifying unit includes: transistor Q7, transistor Q5, diode Z3, capacitor C4, resistor R7, diode D1, transistor Q6, transistor Q8, diode Z4, capacitor C5, resistor R8, diode D2, resistor R23 and resistor R22;
an eleventh pin of the driving chip U7 is respectively connected with a base electrode of the triode Q7 and a base electrode of the triode Q5, a collector electrode of the triode Q7 is connected with a power supply, an emitter electrode of the triode Q7 is connected with an emitter electrode of the triode Q5 through a resistor R22, a collector electrode of the triode Q5 is grounded, an emitter electrode of the triode Q7 is also connected with an anode of a diode Z3, a cathode of the diode Z3 is connected with a grid electrode of a MOS (metal oxide semiconductor) tube VT7, a cathode of the diode Z3 is also connected with one end of the resistor R7, the other end of the resistor R7 is connected with a cathode of a diode D1, an anode of the diode D1 is connected with an input power supply, a capacitor C4 is connected to two ends of the diode Z3 in parallel, and an emitter electrode of the triode Q5 is connected with a grid electrode of the MOS tube VT 9;
the fourteenth pin of the driving chip U7 is respectively connected with the base electrode of the triode Q6 and the base electrode of the triode Q8, the collector electrode of the triode Q6 is connected with the emitter electrode of the triode Q8 through a resistor R23, the collector electrode of the triode Q8 is grounded, the emitter electrode of the triode Q6 is also connected with the positive electrode of a diode Z3, the negative electrode of the diode Z3 is connected with the grid electrode of a MOS tube VT8, the negative electrode of the diode Z3 is also connected with one end of the resistor R8, the other end of the resistor R8 is connected with the negative electrode of a diode D2, the positive electrode of the diode D2 is connected with an input power supply, a capacitor C5 is connected with the two ends of the diode Z3 in parallel, and the emitter electrode of the triode Q8 is connected with the grid electrode of the MOS tube VT 10.
Further, the welding machine further comprises a feedback module connected with the fourth pin of the driving control module and used for obtaining an output current value of the welding machine and sending the current value to the driving control module.
Further, the device also comprises a thermal switch unit, wherein the thermal switch unit is connected with an eighth pin of the driving chip U7.
Further, the device also comprises an input power supply detection unit, wherein the input power supply detection unit is connected with an eighth pin of the driving chip U7.
Further, the power supply system further comprises an auxiliary power supply module, wherein the auxiliary power supply module is used for converting an input power supply, so that the converted input power supply can supply power for the driving 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 PWM modulation chip of SG3525 is selected, so that the output current of the welding machine is more accurate;
(3) The output current value can be obtained in real time through the output current feedback unit, and when the output current value can not meet the welding requirement, a user is timely reminded of checking and maintaining;
(4) The temperature of the IGBT tube is detected through the thermal switch unit, so that the whole circuit is prevented from being burnt out due to the fact that the temperature of the IGBT tube is too high in the welding process, and unnecessary damage is further caused to a user.
Drawings
FIG. 1 is a schematic overall structure of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a foot switch according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a foot switch according to an embodiment of the present invention;
FIG. 4 is an overall circuit diagram of a power input module and a portion of an 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 in 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 module in an embodiment of the invention.
Detailed Description
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions such as those referred to herein as "first," "second," "a," and the like are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1 to 4, the control circuit of the pedal welding machine with the IGBT inversion of the present invention includes: 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 drive 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 is used for acquiring an 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 foot switch is provided with a potentiometer 6 which is connected with a sixth pin of the drive control module, and the resistance value of the potentiometer is adjusted by stepping the foot switch so that the output current of the welding machine is changed.
Wherein, foot switch includes base 1, footboard 2 and rack and pinion subassembly, and base 1 top is provided with a support 3 and through-hole, and footboard 2 and support 3 fixed connection just are the angle of predetermineeing with the base top surface.
The rack and pinion subassembly includes rack 4 and gear 5, and through-hole and footboard 2 fixed connection are passed to the one end of rack 4, and gear 5 and base 1 swing joint just are connected with potentiometre 6 through a logical axle (not shown in the figure), and when footboard 2 atress, the rack removes along vertical direction, drives gear 5 rotation through rack 4, and then changes potentiometre 6's resistance through the rotation of logical axle for operating personnel can constantly adjust the output current of welding machine in welding process, reaches better welding effect.
As shown in fig. 5, the inversion 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 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 a 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 a power supply; the grid electrode of the MOS tube VT9 is connected with the fourteenth pin of the driving chip U7, and the source electrode of the MOS tube VT9 is grounded; the grid electrode of the MOS tube VT10 is connected with the fourteenth pin of the driving chip U7, and the source electrode of the MOS tube VT10 is grounded; the source electrode of the MOS tube VT7 is also connected with the input end of the signal output chip U8, the source electrode 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 at two ends of the resistor R30 in parallel, and the output end of the signal output chip U8 is connected with an IGBT tube.
The drive signal that drive control module sent carries out signal amplification through MOS pipe VT7, MOS pipe VT8, MOS pipe VT9 and MOS pipe VT10 and then exports the IGBT pipe through signal output chip U8 to the break-make of IGBT pipe is adjusted through the PWM wave that drive control module output, makes intermittent type oscillation's frequency low and pulse width narrow, and like this not only no-load loss is little, and the transformer is difficult for saturating moreover. Because the control technology taking Pulse Width Modulation (PWM) as a core is adopted, the better constant current characteristic and the 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 driving chip is SG3525AJ (16).
The first signal amplifying unit includes 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 transistor 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 transistor 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 a ninth pin of the driving chip U7.
After the resistance of the potentiometer changes, the signal of the operational amplifier U2 is amplified, so that the driving chip U7 knows the adjustment condition of a user, and then the output frequency of the PWM wave is changed to change the output current value of the welder.
A second signal amplifying unit is further arranged between the driving chip U7 and the connection of the inversion output module, and the second signal amplifying unit comprises: transistor Q7, transistor Q5, diode Z3, capacitor C4, resistor R7, diode D1, transistor Q6, transistor Q8, diode Z4, capacitor C5, resistor R8, diode D2, resistor R23 and resistor R22;
an eleventh pin of the driving chip U7 is respectively connected with a base electrode of the triode Q7 and a base electrode of the triode Q5, a collector electrode of the triode Q7 is connected with a power supply, an emitter electrode of the triode Q7 is connected with an emitter electrode of the triode Q5 through a resistor R22, a collector electrode of the triode Q5 is grounded, an emitter electrode of the triode Q7 is also connected with an anode of a diode Z3, a cathode of the diode Z3 is connected with a grid electrode of a MOS (metal oxide semiconductor) tube VT7, a cathode of the diode Z3 is also connected with one end of the resistor R7, the other end of the resistor R7 is connected with a cathode of a diode D1, an anode of the diode D1 is connected with an input power supply, a capacitor C4 is connected to two ends of the diode Z3 in parallel, and an emitter electrode of the triode Q5 is connected with a grid electrode of the MOS tube VT 9;
the fourteenth pin of the driving chip U7 is respectively connected with the base electrode of the triode Q6 and the base electrode of the triode Q8, the collector electrode of the triode Q6 is connected with the emitter electrode of the triode Q8 through a resistor R23, the collector electrode of the triode Q8 is grounded, the emitter electrode of the triode Q6 is also connected with the positive electrode of a diode Z3, the negative electrode of the diode Z3 is connected with the grid electrode of a MOS tube VT8, the negative electrode of the diode Z3 is also connected with one end of the resistor R8, the other end of the resistor R8 is connected with the negative electrode of a diode D2, the positive electrode of the diode D2 is connected with an input power supply, a capacitor C5 is connected with the two ends of the diode Z3 in parallel, and the emitter electrode of the triode Q8 is connected with the grid electrode of the MOS tube VT 10.
The PWM wave output by the driving chip U7 enables the triode to be turned on or turned off, and PWM wave output with higher voltage 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 positive electrode of the diode Z1 is connected with the input power supply detection unit, the negative electrode of the diode D3 is connected with the thermosensitive switch unit, and the working state of the power supply of the welding machine is judged by collecting the input power supply value, so that the current output of the welding machine is controlled, and accidents are prevented; the temperature information of IGBT is gathered to the thermal switch unit to feed back to driver chip U7, make driver chip U7 can in time control output current, protection overall 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 input end of the interface CON6 is connected with the current output end of the inversion output module, the output port 1 of the interface CON6 is connected with the second pin of the operational amplifier through the resistor R9, the output current feedback unit sends the collected output current to the ninth pin of the driving chip U7 after passing through the operational amplifier, and the driving chip U7 can adjust the output frequency of PWM waves according to the collected output current, so that the output current value of 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 the P1 port, a 24V power supply is obtained through a transformer T2-1 and used for driving inversion of an IGBT tube, and a 12V power supply is also obtained through the transformer T2-2 and used for supplying power to a driving chip U7.
The invention adopts the pedal switch to control the output current of the welding machine, so that operators can continuously adjust the output current of the welding machine in the welding process, thereby achieving better welding effect; the PWM modulation chip of SG3525 is selected, so that the output current of the welding machine is more accurate; the output current value can be obtained in real time through the output current feedback unit, and when the output current value can not meet the welding requirement, a user is timely reminded of checking and maintaining; the temperature of the IGBT tube is detected through the thermal switch unit, so that the whole circuit is prevented from being burnt out due to the fact that the temperature of the IGBT tube is too high in the welding process, and unnecessary damage is further caused to a user.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (7)
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 drive control module to obtain the output current of the welding machine;
the driving control module comprises a driving chip U7 and a first signal amplifying 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;
the foot switch is provided with a potentiometer, the potentiometer is connected with a sixth pin of the drive control module, and the resistance of the potentiometer is adjusted by stepping the foot switch so that the output current of the welding machine is changed;
the inversion output module comprises a MOS tube VT7, a MOS tube VT8, a MOS tube VT9, a MOS tube VT10, a resistor R30, a capacitor C24, a signal output chip U8 and an IGBT tube;
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 a 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 a power supply; the grid electrode of the MOS tube VT9 is connected with the fourteenth pin of the driving chip U7, and the source electrode of the MOS tube VT9 is grounded; the grid electrode of the MOS tube VT10 is connected with the fourteenth pin of the driving chip U7, and the source electrode of the MOS tube VT10 is grounded; the source electrode of the MOS tube VT7 is also connected with the input end of the signal output chip U8, the source electrode 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 at two ends of the resistor R30 in parallel, and the output end of the signal output chip U8 is connected with an IGBT tube.
2. The IGBT inverted foot welder control circuit of claim 1, wherein the foot switch comprises:
the base is provided with a bracket and a through hole at the top;
the pedal is movably connected with the bracket and forms a preset angle with the top surface of the base;
the gear rack assembly comprises a rack and a gear, one end of the rack penetrates through the through hole to be movably connected with the pedal, the gear is movably connected with the base and is connected with the potentiometer through a through shaft, and when the rack drives the gear to rotate, the resistance of the potentiometer is changed through rotation of the through shaft.
3. The control circuit of the IGBT inverted foot-operated welder according to claim 1, wherein a second signal amplifying unit is further provided between the connection of the driving chip U7 and the inverted output module, and the second signal amplifying unit includes: transistor Q7, transistor Q5, diode Z3, capacitor C4, resistor R7, diode D1, transistor Q6, transistor Q8, diode Z4, capacitor C5, resistor R8, diode D2, resistor R23 and resistor R22;
an eleventh pin of the driving chip U7 is respectively connected with a base electrode of the triode Q7 and a base electrode of the triode Q5, a collector electrode of the triode Q7 is connected with a power supply, an emitter electrode of the triode Q7 is connected with an emitter electrode of the triode Q5 through a resistor R22, a collector electrode of the triode Q5 is grounded, an emitter electrode of the triode Q7 is also connected with an anode of a diode Z3, a cathode of the diode Z3 is connected with a grid electrode of a MOS (metal oxide semiconductor) tube VT7, a cathode of the diode Z3 is also connected with one end of the resistor R7, the other end of the resistor R7 is connected with a cathode of a diode D1, an anode of the diode D1 is connected with an input power supply, a capacitor C4 is connected to two ends of the diode Z3 in parallel, and an emitter electrode of the triode Q5 is connected with a grid electrode of the MOS tube VT 9;
the fourteenth pin of the driving chip U7 is respectively connected with the base electrode of the triode Q6 and the base electrode of the triode Q8, the collector electrode of the triode Q6 is connected with the emitter electrode of the triode Q8 through a resistor R23, the collector electrode of the triode Q8 is grounded, the emitter electrode of the triode Q6 is also connected with the positive electrode of a diode Z4, the negative electrode of the diode Z4 is connected with the grid electrode of a MOS tube VT8, the negative electrode of the diode Z4 is also connected with one end of the resistor R8, the other end of the resistor R8 is connected with the negative electrode of a diode D2, the positive electrode of the diode D2 is connected with an input power supply, a capacitor C5 is connected with the two ends of the diode Z4 in parallel, and the emitter electrode of the triode Q8 is connected with the grid electrode of the MOS tube VT 10.
4. The control circuit of the IGBT inverted foot-operated welder according to claim 1, further comprising a feedback module connected with a fourth pin of the drive control module for obtaining an output current value of the welder and sending the current value to the drive control module.
5. The control circuit of the IGBT inversion pedal welder 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.
6. The control circuit of the IGBT inversion foot-operated welder according to claim 1, further comprising an input power supply detection unit, wherein the input power supply detection unit is connected with an eighth pin of the driving chip U7.
7. The control circuit of the IGBT inversion foot-operated welder according to claim 1, further comprising an auxiliary power module for converting an input power source, so that the converted input power source can supply power for the driving chip U7.
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| CN202110751610.5A CN113458542B (en) | 2021-07-02 | 2021-07-02 | IGBT inversion pedal welding machine control circuit |
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| CN202110751610.5A CN113458542B (en) | 2021-07-02 | 2021-07-02 | IGBT inversion pedal welding machine control circuit |
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| CN200945540Y (en) * | 2006-08-08 | 2007-09-12 | 陈仁富 | Foot-switch current controller for square wave welding machine |
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