High-frequency protection circuit of multifunctional welding machine

Abstract

The utility model discloses a high-frequency protection circuit of a multifunctional welding machine. The high-frequency protection circuit comprises a rectification input module, a full-bridge inversion module, a main transformer T5, a PWM driving assembly, an integrated control module MCU, a welding output module, a plasma cutting output module, an optocoupler U1 and a wire feeding device converter S, the device can effectively prevent high frequency from damaging the welding machine during misoperation, reduces the failure rate of the welding machine, is reasonable in structure, and is favorable for improving the use safety of the welding machine.

Description

[Technical field]

[0001] The utility model relates to the technical field of welding machine protection, in particular to the technical field of high-frequency protection circuits for multifunctional welding machines. [Background technology]

[0002] Welding and cutting equipment is the abbreviation of welding equipment and cutting equipment, and is the most basic processing equipment in metal machining technology. Welding and cutting equipment is an indispensable basic processing equipment in modern industrial production. As long as the industrial field of metal material processing is used, such as steel, aluminum alloy, and other non-ferrous metal processing, welding and cutting equipment is needed.

[0003] At present, multifunctional welding machines integrating semi-automatic gas shielded welding, argon arc welding, manual arc welding and plasma cutting are widely used in the market. The multifunctional welding machine generates high frequency when starting the arc in argon arc welding and plasma cutting; there are two methods of semi-automatic gas shielded welding, positive connection method and reverse connection method, in the positive connection method, the workpiece is connected to the positive output end of the welding machine, and the welding gun is connected to the negative output end of the welding machine; in the reverse connection method, the workpiece is connected to the negative output end of the welding machine, and the welding gun is connected to the positive output end of the welding machine; the welding gun of the semi-automatic gas shielded welding is connected to the wire feeding device, and the wire feeding device is connected to the positive output end or the negative output end of the welding machine through the conversion line to achieve the positive connection method or the reverse connection method; in argon arc welding and plasma cutting, the high frequency is achieved through the negative output end of the welding machine through the welding gun to the workpiece to start the arc; the wire feeding device is connected to the negative output end of the welding machine through the conversion line. At this time, the welding machine is in the state of argon arc welding or plasma cutting, and the arc starting will generate high frequency, which is transmitted to the wire feeding device and the control circuit through the negative output end and the wire feeding device conversion line, and the wire feeding device and the control circuit will be damaged by the high frequency. [Utility Model Content]

[0004] The purpose of the utility model is to solve the problems in the prior art and propose a multifunctional welding machine high-frequency protection circuit, which can effectively prevent high frequency damage to the welding machine during misoperation, reduce the failure rate of the welding machine, and has a reasonable structure, which is conducive to improving the safety of the welding machine.

[0005] To achieve the above-mentioned purpose, the utility model proposes a multifunctional welding machine high-frequency protection circuit, including a rectifier input module, a full-bridge inverter module, a main transformer T5, a PWM drive component, an integrated control module MCU, a welding output module, a plasma cutting output module, an optical coupler U1 and a wire feeding device converter S, wherein the rectifier input module is connected to the full-bridge inverter module, the full-bridge inverter module is connected to the primary sides CT1 and CT2 of the main transformer T5, the full-bridge inverter module is connected to the PWM drive component, and the PWM drive component is connected to the integrated control module MCU. The main transformer T5 is connected to the welding output module and the plasma cutting output module respectively, the pin 1 of the optocoupler U1 is connected to the positive output terminal of the welding machine through the protection circuit R1, the pin 2 of the optocoupler U1 is connected to the pin 1 of the wire feeding device conversion S, the pin 4 of the optocoupler U1 is connected to the integrated control module MCU, the pin 3 of the optocoupler U1 is grounded, the pin 1 of the wire feeding device conversion S is connected to the wire feeding device, the pin 2 of the wire feeding device conversion S is connected to the positive output terminal of the welding machine, and the pin 3 of the wire feeding device conversion S is connected to the negative output terminal of the welding machine.

[0006] Preferably, the rectifier input module includes a rectifier bridge DB1, a filter circuit C7 and a protection circuit R3, the rectifier bridge DB1 is connected to the filter circuit C7, the protection circuit R3 is connected in parallel at both ends of the filter circuit C7, and the output end of the filter circuit C7 is connected to the full-bridge inverter module.

[0007] Preferably, the full-bridge inverter module includes an inverter control circuit IGBT Q1, an inverter control circuit IGBT Q2, an inverter control circuit IGBT Q3 and an inverter control circuit IGBT Q4, and the PWM drive component is connected one by one to the inverter control circuit IGBT Q1, the inverter control circuit IGBT Q2, the inverter control circuit IGBT Q3 and the inverter control circuit IGBT Q4 respectively.

[0008] Preferably, the welding output module includes a rectifier output circuit D1, an inductor L1, an arc starter T2 and a rectifier output circuit D2, pin 1 of the main transformer T5 is connected to the rectifier output circuit D1, pin 2 of the main transformer T5 is connected to the inductor L1, the inductor L1 is connected to the arc starter T2, and pin 3 of the main transformer T5 is connected to the rectifier output circuit D2.

[0009] Preferably, the plasma cutting output module includes a rectifier output circuit D3, a rectifier output circuit D4, a rectifier output circuit D5, a rectifier output circuit D6, an inductor L2, an arc starter T2 and a relay K1, pin 7 of the main transformer T5 is respectively connected to the rectifier output circuit D3 and the rectifier output circuit D4, pin 8 of the main transformer T5 is respectively connected to the rectifier output circuit D5 and the rectifier output circuit D6, the rectifier output circuit D4 and the rectifier output circuit D5 are connected to the inductor L2, the inductor L2 is connected to the arc starter T2, and the rectifier output circuit D3 and the rectifier output circuit D6 are connected to the relay K1.

[0010] Preferably, the optical coupler U1 is provided with a protection circuit R2 in series.

[0011] Beneficial effects of the utility model: the utility model combines a rectifier input module, a full-bridge inverter module, a main transformer T5, a PWM drive component, an integrated control module MCU, a welding output module, a plasma cutting output module, an optocoupler U1 and a wire feeding device converter S together, and after experimental optimization, the welding gun of the semi-automatic gas shielded welding is connected to the wire feeding device, and the semi-automatic gas shielded welding realizes the reverse connection method by connecting the 1st and 2nd pins of the wire feeding device converter S to the positive output terminal of the welding machine; the semi-automatic gas shielded welding realizes the positive connection method by connecting the 1st and 3rd pins of the wire feeding device converter S to the negative output terminal of the welding machine; when the 1st and 3rd pins of the wire feeding device converter S are connected to the negative output terminal of the welding machine, when the welding machine is working, a voltage difference is generated between the positive output terminal of the welding machine and the negative output terminal of the welding machine, and is loaded to the 1st and 2nd pins of the optocoupler U1 through the protection circuit R1 to make the optocoupler U1 work, at this time, the level of the 4th pin of the optocoupler U1 becomes low, and the 4th pin of the optocoupler U1 is connected to the integrated control module MCU, and the integrated control module When the MCU detects a low level, the integrated control module MCU controls the high-frequency component of the welder not to generate high frequency and issues a warning during argon arc welding or plasma cutting; when pins 1 and 2 of the wire feeding device converter S are connected to the positive output terminal of the welder or pins 1, 2 and 3 of the wire feeding device converter S are not connected, pins 1 and 2 of the optocoupler U1 do not generate a voltage difference in any state, the optocoupler U1 does not work, and pin 4 of the optocoupler U1 is a high level. During argon arc welding or plasma cutting, the integrated control module MCU controls the high-frequency component to generate high frequency, and the high-frequency component is connected to the arc starter T2. After the integrated control module MCU controls the high-frequency component to generate high frequency, it is coupled to the negative output terminal of the welder through the arc starter T2. Relay K1 is closed only when plasma cutting is selected and disconnected in the welding state to avoid the high plasma output voltage from being superimposed on the welding circuit, effectively preventing the damage of the high frequency to the welder during misoperation, reducing the failure rate of the welder, and improving the safety of the welder.

[0012] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Brief Description of the Drawings

[0013] Figure 1 The utility model is a circuit structure schematic diagram of a high-frequency protection circuit of a multifunctional welding machine. [Specific implementation method]

[0014] See also Figure 1The utility model multifunctional welding machine high-frequency protection circuit includes a rectifier input module, a full-bridge inverter module, a main transformer T5, a PWM drive component, an integrated control module MCU, a welding output module, a plasma cutting output module, an optical coupler U1 and a wire feeding device conversion S. The rectifier input module is connected to the full-bridge inverter module, the full-bridge inverter module is connected to the primary sides CT1 and CT2 of the main transformer T5, the full-bridge inverter module is connected to the PWM drive component, the PWM drive component is connected to the integrated control module MCU, the main transformer T5 is respectively connected to the welding output module and the plasma cutting output module, and the 1st foot of the optical coupler U1 is connected to the positive output terminal of the welding machine through the protection circuit R1. Pin 2 of the optocoupler U1 is connected to pin 1 of the wire feeding device converter S, pin 4 of the optocoupler U1 is connected to the integrated control module MCU, pin 3 of the optocoupler U1 is grounded, pin 1 of the wire feeding device converter S is connected to the wire feeding device, pin 2 of the wire feeding device converter S is connected to the positive output end of the welding machine, and pin 3 of the wire feeding device converter S is connected to the negative output end of the welding machine. The rectifier input module includes a rectifier bridge DB1, a filter circuit C7 and a protection circuit R3. The rectifier bridge DB1 is connected to the filter circuit C7, and the protection circuit R3 is connected in parallel at both ends of the filter circuit C7. The output end of the filter circuit C7 is connected to a full-bridge inverter module, and the full-bridge inverter module includes an inverter control circuit IGBT Q1, an inverter control circuit IGBT Q2, an inverter control circuit IGBT Q3 and an inverter control circuit IGBT Q4. The PWM drive component is respectively connected to the inverter control circuit IGBT Q1, the inverter control circuit IGBT Q2, the inverter control circuit IGBT Q3 and the inverter control circuit IGBT Q4 are connected one by one, the welding output module includes a rectifier output circuit D1, a reactor L1, an arc starter T2 and a rectifier output circuit D2, the 1st foot of the main transformer T5 is connected to the rectifier output circuit D1, the 2nd foot of the main transformer T5 is connected to the reactor L1, the reactor L1 is connected to the arc starter T2, the 3rd foot of the main transformer T5 is connected to the rectifier output circuit D2, and the plasma cutting output module includes a rectifier output circuit D3, a rectifier output circuit D4, a rectifier output circuit D5, and a rectifier output circuit D6 , reactor L2, arc starter T2 and relay K1, pin 7 of the main transformer T5 is respectively connected to the rectifier output circuit D3 and the rectifier output circuit D4, pin 8 of the main transformer T5 is respectively connected to the rectifier output circuit D5 and the rectifier output circuit D6, the rectifier output circuit D4 and the rectifier output circuit D5 are connected to the reactor L2, the reactor L2 is connected to the arc starter T2, the rectifier output circuit D3 and the rectifier output circuit D6 are connected to the relay K1, and the optocoupler U1 is serially connected with a protection circuit R2.

[0015] The welding gun of the semi-automatic gas shielded welding is connected to the wire feeding device. The semi-automatic gas shielded welding realizes the reverse connection method by converting the 1st and 2nd pins of S through the wire feeding device and connecting them to the positive output terminal of the welding machine. The semi-automatic gas shielded welding realizes the positive connection method by converting the 1st and 3rd pins of S through the wire feeding device and connecting them to the negative output terminal of the welding machine. When the wire feeding device converts the 1st and 3rd pins of S and connects them to the negative output terminal of the welding machine, when the welding machine is working, a voltage difference is generated between the positive output terminal of the welding machine and the negative output terminal of the welding machine, which is loaded to the 1st and 2nd pins of the optocoupler U1 through the protection circuit R1 to make the optocoupler U1 work. At this time, the level of the 4th pin of the optocoupler U1 becomes low, and the 4th pin of the optocoupler U1 is connected to the integrated control module MCU. When the integrated control module MCU detects a low level, the integrated control module MCU controls the high-frequency component of the welding machine not to generate high frequency and emit during the argon arc welding or plasma cutting process. Warning: When pins 1 and 2 of the wire feeding device converter S are connected to the positive output terminal of the welding machine, or when pins 1, 2 and 3 of the wire feeding device converter S are not connected, pins 1 and 2 of the optocoupler U1 do not generate a voltage difference in any state, the optocoupler U1 does not work, and pin 4 of the optocoupler U1 is at a high level. During argon arc welding or plasma cutting, the integrated control module MCU of the welding machine controls the high-frequency component to generate high frequency, and the high-frequency component is connected to the arc starter T2. After the integrated control module MCU controls the high-frequency component to generate high frequency, it is coupled to the negative output terminal of the welding machine through the arc starter T2. Relay K1 is closed only when plasma cutting is selected and is disconnected in the welding state to avoid the high output voltage of plasma being superimposed on the welding circuit, effectively preventing the damage of the high frequency to the welding machine during misoperation, reducing the failure rate of the welding machine, and improving the safety of the welding machine.

[0016] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. Multifunctional welding machine high frequency protection circuit, characterized by: It includes a rectifier input module, a full-bridge inverter module, a main transformer T5, a PWM drive component, an integrated control module MCU, a welding output module, a plasma cutting output module, an optical coupler U1 and a wire feeding device conversion S. The rectifier input module is connected to the full-bridge inverter module, the full-bridge inverter module is connected to the primary sides CT1 and CT2 of the main transformer T5, the full-bridge inverter module is connected to the PWM drive component, the PWM drive component is connected to the integrated control module MCU, the main transformer T5 is respectively connected to the welding output module and the plasma cutting output module, the pin 1 of the optical coupler U1 is connected to the positive output end of the welding machine through the protection circuit R1, the pin 2 of the optical coupler U1 is connected to the pin 1 of the wire feeding device conversion S, the pin 4 of the optical coupler U1 is connected to the integrated control module MCU, the pin 3 of the optical coupler U1 is grounded, the pin 1 of the wire feeding device conversion S is connected to the wire feeding device, the pin 2 of the wire feeding device conversion S is connected to the positive output end of the welding machine, and the pin 3 of the wire feeding device conversion S is connected to the negative output end of the welding machine.

2. The multifunctional welding machine high frequency protection circuit as claimed in claim 1, characterized in that: The rectifier input module includes a rectifier bridge DB1, a filter circuit C7 and a protection circuit R3. The rectifier bridge DB1 is connected to the filter circuit C7. The protection circuit R3 is connected in parallel at both ends of the filter circuit C7. The output end of the filter circuit C7 is connected to the full-bridge inverter module.

3. The multifunctional welding machine high frequency protection circuit as claimed in claim 1, characterized in that: The full-bridge inverter module includes an inverter control circuit IGBT Q1, an inverter control circuit IGBT Q2, an inverter control circuit IGBT Q3 and an inverter control circuit IGBT Q4, and the PWM drive component is connected to the inverter control circuit IGBT Q1, the inverter control circuit IGBT Q2, the inverter control circuit IGBT Q3 and the inverter control circuit IGBT Q4 one by one.

4. The multifunctional welding machine high frequency protection circuit as claimed in claim 1, characterized in that: The welding output module includes a rectifier output circuit D1, an inductor L1, an arc starter T2 and a rectifier output circuit D2, pin 1 of the main transformer T5 is connected to the rectifier output circuit D1, pin 2 of the main transformer T5 is connected to the inductor L1, the inductor L1 is connected to the arc starter T2, and pin 3 of the main transformer T5 is connected to the rectifier output circuit D2.

5. The multifunctional welding machine high frequency protection circuit as claimed in claim 1, characterized in that: The plasma cutting output module includes a rectifier output circuit D3, a rectifier output circuit D4, a rectifier output circuit D5, a rectifier output circuit D6, an inductor L2, an arc starter T2 and a relay K1. Pin 7 of the main transformer T5 is respectively connected to the rectifier output circuit D3 and the rectifier output circuit D4, pin 8 of the main transformer T5 is respectively connected to the rectifier output circuit D5 and the rectifier output circuit D6, the rectifier output circuit D4 and the rectifier output circuit D5 are connected to the inductor L2, the inductor L2 is connected to the arc starter T2, and the rectifier output circuit D3 and the rectifier output circuit D6 are connected to the relay K1.

6. The multifunctional welding machine high frequency protection circuit as claimed in claim 1, characterized in that: The optical coupler U1 is connected in series with a protection circuit R2.

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