CN218217105U - Switch type high-frequency oscillation arc striking circuit and electric welding machine - Google Patents

Abstract

A switch type high-frequency oscillation arc striking circuit and an electric welding machine. The switch type high-frequency oscillation arc striking circuit comprises a switch frequency generation module, a driving power amplification module, a switch power supply module and a high-frequency arc striking oscillation module, wherein the input end of the switch frequency generation module and the input end of the switch power supply module both receive high-frequency control signals; the high-frequency arc striking oscillation module comprises a thyristor, an eighth diode, a first capacitor and a first transformer, the output end of the switching power supply module is electrically connected with one input end of the first transformer, the other input end of the first transformer is electrically connected with the anode of the thyristor, the cathode of the thyristor is grounded, and the output end of the switching frequency generation module, the driving power amplification module and the control electrode of the thyristor are electrically connected in sequence; and the anode of the eighth diode is electrically connected with the cathode of the thyristor, and the cathode of the eighth diode is electrically connected with the anode of the thyristor. The utility model discloses can solve traditional high frequency arc starting device and can produce and vibrate many times, disturb big problem.

Description

Switch type high-frequency oscillation arc striking circuit and electric welding machine

Technical Field

The utility model belongs to the technical field of the contravariant welding machine technique and specifically relates to a be applied to switching mode high frequency oscillation striking circuit and electric welding on the contravariant welding machine.

Background

Argon tungsten-arc welding is a common welding method due to the characteristics of no splashing, fine control, stable electric arc, high welding quality and the like. The arc striking method for argon tungsten-arc welding is generally divided into three types: striking arc, lifting arc and high-frequency arc. Wherein, the high-frequency arc striking does not contact the workpiece, the arc striking current is controllable, and the application range is widest.

The high-frequency arc ignition is to use a high-frequency high-voltage generator to generate high voltage between a tungsten electrode and a workpiece to break down air discharge to ignite an arc. In the research direction of high-frequency pulse arc striking, a voltage-doubling rectification method is generally adopted at present to improve the voltage.

The circuit form is introduced in a reference document (journal of electric welding machines, 2006, 6 th, 8-9,55 pages, design and debugging of TIG welding voltage-multiplying rectification type arc striking circuits), voltage is firstly increased in a voltage-multiplying rectification mode, then the on-off of a thyristor is controlled through a control circuit, and a high-voltage arc striking signal is generated on the output of the welding machine by LC oscillation. However, when the voltage-doubling rectifying mode is adopted, the charging of the capacitor takes time, and the delay is more obvious when the required voltage is higher, so that the limitation that the voltage-doubling rectifying voltage cannot be too large is also realized. Meanwhile, the driving circuit of the thyristor introduced in the document is generated by a pulse signal with fixed frequency, and drives the thyristor through a transformer, the circuit is complex, and if a digital microprocessor is adopted to generate the pulse signal, the circuit is easily interfered.

In addition, a high-frequency arc striking circuit made of a current type PWM controller is also researched, namely, a flyback switching power supply is formed on the primary side of an isolation transformer, the secondary side voltage of the isolation transformer is increased, oscillation is formed after the secondary side voltage of the isolation transformer reaches the breakdown voltage of a spark discharger, and the secondary side voltage of the isolation transformer is coupled to the output of a welding machine through a booster transformer. But the spark gap still generates high-frequency oscillation essentially, and strong interference still exists.

SUMMERY OF THE UTILITY MODEL

The utility model provides a switch-type high frequency oscillation arc striking circuit and electric welding can solve traditional high frequency arc striking ware and can produce the problem that vibrate many times, disturb greatly.

In order to solve the above problems, the utility model adopts the following technical scheme:

according to a first aspect of the present invention, an embodiment of the present invention provides a switch type high-frequency oscillation arc striking circuit, which includes a switching frequency generation module, a driving power amplification module, a switching power supply module and a high-frequency arc striking oscillation module, wherein an input end of the switching frequency generation module and an input end of the switching power supply module are both used for receiving a high-frequency control signal; the high-frequency arc striking oscillation module comprises a thyristor, an eighth diode, a first capacitor and a first transformer, the output end of the switching power supply module is electrically connected with one input end of the first transformer, the other input end of the first transformer is electrically connected with the anode of the thyristor, the cathode of the thyristor is grounded, and the output end of the switching frequency generation module, the driving power amplification module and the control electrode of the thyristor are electrically connected in sequence; the anode of the eighth diode is electrically connected with the cathode of the thyristor, and the cathode of the eighth diode is electrically connected with the anode of the thyristor; one end of the first capacitor is electrically connected with the output end of the switch power supply module, and the other end of the first capacitor is electrically connected with the cathode of the thyristor.

In some embodiments, the driving power amplifying module includes a fifth triode, a sixth triode, a seventeenth capacitor, a twenty-eighth resistor and a twenty-ninth resistor, the sixth triode is an NPN-type triode, the fifth triode is a PNP-type triode, a base of the fifth triode is electrically connected to a base of the sixth triode, an output end of the switching frequency generating module is electrically connected to the base of the sixth triode, a collector of the sixth triode is electrically connected to the dc power supply, an emitter of the sixth triode is electrically connected to an emitter of the fifth triode, a collector of the fifth triode is grounded, the emitter of the sixth triode, the seventeenth capacitor, the twenty-eighth resistor and a control electrode of the thyristor are electrically connected in sequence, and one end of the twenty-eighth resistor connected to the control electrode of the thyristor, the twenty-ninth resistor and a ground terminal are electrically connected in sequence.

In some embodiments, the switching frequency generation module includes an NE555 chip, the 2 pins and the 6 pins of the NE555 chip are both used for receiving the high-frequency control signal, the 3 pin of the NE555 chip is electrically connected with the driving power amplification module, the 3 pin of the NE555 chip is electrically connected with the 2 pin of the NE555 chip, the 4 pin and the 8 pin of the NE555 chip are both electrically connected with a direct current power supply, the 1 pin and the 7 pin of the NE555 chip are both grounded, and the 5 pin of the NE555 chip, the capacitor C14 and the ground terminal are sequentially and electrically connected.

In some embodiments, the switching power supply module includes a flyback switching power supply, a forward switching power supply, or a push-pull switching power supply.

In some embodiments, the switching power supply module includes a UC3845 chip, a switching tube and a second transformer, one input end of the second transformer is electrically connected to the dc power supply, the other input end of the second transformer is electrically connected to one connection end of the switching tube, the other connection end of the switching tube is grounded, a control end of the switching tube is electrically connected to pin 10 of the UC3845 chip, the grounded connection end of the switching tube is electrically connected to pin 5 of the UC3845 chip, and pin 3 of the UC3845 chip is electrically connected to a secondary winding of the second transformer.

In some embodiments, the switching type high-frequency oscillation arc striking circuit further includes a seventh triode, a base of the seventh triode is used for receiving the high-frequency control signal, a collector of the seventh triode is electrically connected to pin 1 of the UC3845 chip, and an emitter of the seventh triode is grounded.

In some embodiments, the switching type high-frequency oscillation arc striking circuit further includes a common input terminal, a seventh diode, an eighth diode, and a twenty-fifth resistor, the common input terminal is configured to receive the high-frequency control signal, an anode of the seventh diode is electrically connected to the common input terminal, a cathode of the seventh diode is electrically connected to the input terminal of the switching frequency generation module, an anode of the eighth triode is electrically connected to the common input terminal, and a cathode of the eighth diode, the twenty-fifth resistor, and a base of the seventh triode are electrically connected in sequence.

According to the utility model discloses a second aspect, the utility model discloses an embodiment provides an electric welding, include as above-mentioned first aspect arbitrary switched mode high frequency oscillation striking circuit.

The utility model discloses following beneficial effect has at least: the utility model discloses a switching frequency generation module output control signal, through drive power amplification module carry out power amplification back direct drive thyristor, when the thyristor switched on, first electric capacity discharges to first transformer, the coil formation of first electric capacity and first transformer vibrates, then the electric current continues to charge to first electric capacity in the reverse direction, first electric capacity charges and accomplishes the back, the thyristor is closed, and the eighth diode switches on, first electric capacity reverse discharge, the thyristor bears the back pressure, this working process forms and vibrates to be used for the striking. The circuit structure can reduce the frequency of high-frequency oscillation and effectively weaken electromagnetic interference.

Drawings

Fig. 1 is a schematic block diagram of a switching type high-frequency oscillating arc striking circuit according to an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of a switching type high-frequency oscillating arc striking circuit according to an embodiment of the present invention;

fig. 3 is a schematic circuit structure diagram of a high-frequency arc striking oscillation module according to an embodiment of the present invention;

fig. 4 is a schematic circuit diagram of a driving power amplifying module according to an embodiment of the present invention;

fig. 5 is a schematic circuit diagram of a switching frequency generation module according to an embodiment of the present invention;

fig. 6 is a schematic circuit diagram of a switching power supply module according to an embodiment of the present invention.

Detailed Description

The present disclosure provides the following description with reference to the accompanying drawings to assist in a comprehensive understanding of various embodiments of the disclosure as defined by the claims and their equivalents. The description includes various specific details to aid understanding, but such details are to be regarded as exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. Moreover, the descriptions of the disclosed functions and configurations may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are not limited to the literal meanings, but are used merely by the utility model to enable a clear and consistent understanding of the disclosure. Accordingly, it will be apparent to those skilled in the art that the following descriptions of the various embodiments of the present disclosure are provided for illustration only and not for the purpose of limiting the disclosure as defined by the appended claims and their equivalents.

The terms "having," "may have," "including," or "may include" used in various embodiments of the present disclosure indicate the presence of the respective functions, operations, elements, etc., disclosed, but do not limit additional one or more functions, operations, elements, etc. Furthermore, it is to be understood that the terms "comprises" or "comprising," when used in various embodiments of the present disclosure, are intended to specify the presence of stated features, integers, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, operations, elements, components, or groups thereof.

It will be understood that when an element (e.g., a first element) is "connected" or "electrically connected" to another element (e.g., a second element), the element can be directly connected or electrically connected to the other element or intervening elements (e.g., a third element) may be present between the element and the other element.

An embodiment of the utility model provides a switch-type high frequency oscillation striking circuit, as shown in fig. 1-3, it includes that switching frequency generation module 100, drive power amplification module 200, switching power supply module 300 and high frequency strike and vibrate module 400, and switching frequency generation module 100's input and switching power supply module 300's an input all are used for receiving high frequency control signal, and high frequency control signal specifically can be produced by the control module of electric welding to control whole switch-type high frequency oscillation striking circuit and strike the arc. The high-frequency arc striking oscillation module comprises a thyristor SCR, an eighth diode K8, a first capacitor C1 and a first transformer (a booster transformer in the figure), the output end of the switching power supply module 300 is electrically connected with one input end of the first transformer, the other input end of the first transformer is electrically connected with the anode of the thyristor, the cathode of the thyristor is grounded, and the output end of the switching frequency generation module 100, the driving power amplification module 200 and the control electrode of the thyristor are electrically connected in sequence; the anode of the eighth diode is electrically connected with the cathode of the thyristor, and the cathode of the eighth diode is electrically connected with the anode of the thyristor; one end of the first capacitor is electrically connected with the output end of the switching power supply module, and the other end of the first capacitor is electrically connected with the cathode of the thyristor.

In this embodiment, the switching power supply module 300 outputs the boosted arc striking signal, the switching frequency generation module 100 outputs the control signal, and the thyristor is directly driven after power amplification is performed by the driving power amplification module 200. When the thyristor is conducted, the first capacitor discharges to the first transformer, the first capacitor and a coil of the first transformer oscillate, then the current continues to reversely charge the first capacitor, after the charging of the first capacitor is completed, the thyristor is turned off, the eighth diode is conducted, the first capacitor reversely discharges, the thyristor bears the back voltage, the oscillation is formed in the working process, and after the voltage is boosted for the second time through the first transformer, the first transformer can output a high-voltage signal of tens of thousands of volts so as to perform arc striking. Compared with the traditional arc initiator, the circuit structure of the embodiment can reduce the frequency of high-frequency oscillation and effectively weaken electromagnetic interference.

In some embodiments, as shown in fig. 4, the driving power amplifying module includes a fifth transistor K5, a sixth transistor K6, a seventeenth capacitor C17, a twenty eighth resistor R28, and a twenty ninth resistor R29, the sixth transistor is an NPN-type transistor, the fifth transistor is a PNP-type transistor, a base of the fifth transistor is electrically connected to a base of the sixth transistor, an output terminal of the switching frequency generating module is electrically connected to the base of the sixth transistor, a collector of the sixth transistor is electrically connected to the dc power supply, specifically, the collector of the sixth transistor of the present embodiment may be electrically connected to a +15V dc power supply, an emitter of the sixth transistor is electrically connected to an emitter of the fifth transistor, the collector of the fifth transistor is grounded, an emitter of the sixth transistor, the seventeenth capacitor, the twenty eighth resistor, and a control electrode of the thyristor are electrically connected in sequence, and one end of the twenty eighth resistor connected to the control electrode of the thyristor, the twenty ninth resistor, and a ground terminal are electrically connected in sequence.

In this embodiment, when the switching frequency generation module 100 outputs a high level, the sixth triode is turned on, the fifth triode is turned off, and the dc power is loaded to the control electrode of the thyristor after passing through the sixth triode, so that the thyristor is turned on; when the switching frequency generation module 100 outputs a bottom level, the fifth transistor is turned on, the sixth transistor is turned off, and the control electrode of the thyristor is grounded, so that the thyristor is turned off, thereby driving the thyristor.

Further, as shown in fig. 5, the switching frequency generation module includes an NE555 chip, pins 2 and 6 of the NE555 chip are both used for receiving a high-frequency control signal, pin 3 of the NE555 chip is electrically connected with the driving power amplification module, pin 3 of the NE555 chip is electrically connected with pin 2 of the NE555 chip, pin 4 and pin 8 of the NE555 chip are both electrically connected with a dc power supply, pin 1 and pin 7 of the NE555 chip are both grounded, and pin 5 of the NE555 chip, the capacitor C14 and a ground terminal are sequentially electrically connected.

In this embodiment, pin 2 of the NE555 chip is used as a trigger pin, which receives a high-frequency control signal, and pin 3 is used as an output to be electrically connected to the driving power amplification module. Because pin 3 is electrically connected with pin 2, an oscillation loop is formed, and pin 3 can output a pulse oscillation signal. Compared with the method for controlling the thyristor by using the digital microprocessor, the switching frequency generation module of the embodiment is not easily interfered, and can stably drive the thyristor.

In some embodiments, the switching power supply module includes a flyback switching power supply, a forward switching power supply, or a push-pull switching power supply. The flyback switching power supply can adjust output voltage through simple circuit change, the process of starting the switching power supply to establish the output voltage basically has no time delay, the switching power supply is generally a high-frequency switching power supply, the power supply is small in size, and the flyback switching power supply is preferably adopted.

Specifically, as shown in fig. 6, the switching power supply module includes a UC3845 chip, a switching tube K1 and a second transformer T1, one input end of the second transformer is electrically connected to the dc power supply, the other input end of the second transformer is electrically connected to one connection end of the switching tube, the other connection end of the switching tube is grounded, a control end of the switching tube is electrically connected to pin 10 of the UC3845 chip, the grounded connection end of the switching tube is electrically connected to pin 5 of the UC3845 chip, and pin 3 of the UC3845 chip is electrically connected to the secondary winding of the second transformer. Therefore, the flyback switching power supply controlled by the current type PWM is formed, and the whole structure is simple.

Further, as shown in fig. 2, the switch-type high-frequency oscillation arc striking circuit further includes a seventh triode K7, a base of the seventh triode is used for receiving the high-frequency control signal, a collector of the seventh triode is electrically connected to pin 1 of the UC3845 chip, and an emitter of the seventh triode is grounded. The seventh triode K7 plays a role of an inverter, when the high-frequency control signal is at a high level, pin 1 of the UC3845 chip is at a low level, and when the high-frequency control signal is at a low level, pin 1 of the UC3845 chip is at a high level, and after level conversion, the requirements of the switching power supply module can be met.

Furthermore, as shown in fig. 2, the switch-type high-frequency oscillating arc-striking circuit further includes a common input terminal, a seventh diode D7, an eighth diode D8 and a twenty-fifth resistor R25, the common input terminal is configured to receive a high-frequency control signal, an anode of the seventh diode is electrically connected to the common input terminal, a cathode of the seventh diode is electrically connected to the input terminal of the switching frequency generation module, an anode of the eighth triode is electrically connected to the common input terminal, and a cathode of the eighth diode, the twenty-fifth resistor and a base of the seventh triode are electrically connected in sequence. Thus, the switching frequency generation module and the switching power supply module receive the high-frequency control signal through the same port, which can simplify the circuit structure.

The embodiment of the utility model provides an electric welding still provides an electric welding, including the switch mode high frequency oscillation striking circuit of any above-mentioned embodiment, above-mentioned embodiment can be referred to the concrete description about switch mode high frequency oscillation striking circuit, no longer gives details here.

The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and it is not to be understood that the specific embodiments of the present invention are limited to these descriptions. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement.

Claims (8)

1. A switch type high-frequency oscillation arc striking circuit is characterized in that: the high-frequency arc striking and extinguishing device comprises a switching frequency generating module, a driving power amplifying module, a switching power supply module and a high-frequency arc striking and oscillating module, wherein the input end of the switching frequency generating module and one input end of the switching power supply module are used for receiving a high-frequency control signal; the high-frequency arc striking oscillation module comprises a thyristor, an eighth diode, a first capacitor and a first transformer, the output end of the switching power supply module is electrically connected with one input end of the first transformer, the other input end of the first transformer is electrically connected with the anode of the thyristor, the cathode of the thyristor is grounded, and the output end of the switching frequency generation module, the driving power amplification module and the control electrode of the thyristor are electrically connected in sequence; the anode of the eighth diode is electrically connected with the cathode of the thyristor, and the cathode of the eighth diode is electrically connected with the anode of the thyristor; one end of the first capacitor is electrically connected with the output end of the switching power supply module, and the other end of the first capacitor is electrically connected with the cathode of the thyristor.

2. The switched high frequency oscillating arc ignition circuit of claim 1 wherein: the drive power amplification module includes fifth triode, sixth triode, seventeenth electric capacity, twenty-eighth resistance and twenty-ninth resistance, the sixth triode is NPN type triode, the fifth triode is PNP type triode, the base of fifth triode and the base electricity of sixth triode are connected, switching frequency generation module's output is connected with the base electricity of sixth triode, the collecting electrode and the DC power supply electricity of sixth triode are connected, the projecting pole of sixth triode with the projecting pole electricity of fifth triode is connected, the collecting electrode ground connection of fifth triode, the projecting pole of sixth triode, seventeenth electric capacity, twenty-eighth resistance and the control pole of thyristor are connected in order electricity, the one end that links to each other with the control pole of thyristor of twenty-eighth resistance, twenty-ninth resistance and earthing terminal are connected in order electricity.

3. The switched high frequency oscillating arc ignition circuit of claim 1 wherein: the switching frequency generation module comprises an NE555 chip, wherein pins 2 and 6 of the NE555 chip are used for receiving the high-frequency control signal, pins 3 of the NE555 chip are electrically connected with the driving power amplification module, pins 3 of the NE555 chip are electrically connected with pins 2 of the NE555 chip, pins 4 and 8 of the NE555 chip are electrically connected with a direct current power supply, pins 1 and 7 of the NE555 chip are grounded, and pin 5 of the NE555 chip, a capacitor C14 and a ground terminal are electrically connected in sequence.

4. The switched high frequency oscillating arc ignition circuit of claim 1 wherein: the switching power supply module comprises a flyback switching power supply, a forward switching power supply or a push-pull switching power supply.

5. The switched high frequency oscillating arc ignition circuit of claim 4 wherein: the switching power supply module includes UC3845 chip, switch tube and second transformer, an input and the direct current power supply electricity of second transformer are connected, and another input is connected with a link electricity of switch tube, another link ground connection of switch tube, the control end of switch tube is connected with 10 pins electricity of UC3845 chip, that link of switch tube ground connection is connected with 5 pins electricity of UC3845 chip, 3 pins of UC3845 chip are connected with the secondary winding electricity of second transformer.

6. The switched high frequency oscillating arc ignition circuit of claim 5 wherein: the switch type high-frequency oscillation arc striking circuit further comprises a seventh triode, a base electrode of the seventh triode is used for receiving the high-frequency control signal, a collector electrode of the seventh triode is electrically connected with a pin 1 of the UC3845 chip, and an emitting electrode of the seventh triode is grounded.

7. The switched high frequency oscillating arc ignition circuit of claim 6 wherein: the switch type high-frequency oscillation arc striking circuit further comprises a public input end, a seventh diode, an eighth diode and a twenty-fifth resistor, wherein the public input end is used for receiving the high-frequency control signal, the anode of the seventh diode is electrically connected with the public input end, the cathode of the seventh diode is electrically connected with the input end of the switching frequency generation module, the anode of the eighth triode is electrically connected with the public input end, and the cathode of the eighth diode, the twenty-fifth resistor and the base of the seventh triode are electrically connected in sequence.

8. An electric welding machine which characterized in that: comprising a switched high frequency oscillating arc ignition circuit according to any one of claims 1 to 7.

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