CN206981959U - A kind of inverter type welder arc ignition circuit - Google Patents

Abstract

It the utility model is related to a kind of inverter type welder arc ignition circuit, including main transformer, striking transformer T1 and striking impulse circuit, in inverter type welder negative output line, the primary of the striking transformer T1 is connected the secondary tandem of the striking transformer T1 with the striking impulse circuit.The inverter type welder arc ignition circuit provided in above-mentioned technical proposal, the superimposed pulses of 80V crest voltages are on inverter type welder output voltage wherein caused by striking impulse circuit, striking voltage is raised, greatly improves the arcing initiation success rate of inverter type welder, and there is the advantages of being not easy current interruption when welding.

Description

A kind of inverter type welder arc ignition circuit

Technical field

It the utility model is related to arc ignition circuit control technology field, and in particular to a kind of inverter type welder arc ignition circuit.

Background technology

Inversion refers to the process of direct current to be changed into alternating current, based on inversion transformation technique, by electric main rectification-inverse Change-rectification again, its Arc Welding Power for exporting direct current and having steep dropping voltampere characteristic are referred to as inverter type welder.General inverter type welder is not set Special arc ignition circuit, generally use contacting ignition arc before welding, i.e., welding rod and weldment are slidably reciprocated striking before welding, due to it Floating voltage is low, and an arcing initiation success rate only has 1/3rd, and the easy current interruption in welding process, particularly in low current During welding, the shortcoming is especially prominent.

Utility model content

The technical problems to be solved in the utility model, which is to provide one kind, to raise striking voltage, greatly improve inverter type welder The inverter type welder arc ignition circuit of arcing initiation success rate, its circuit structure is simple, cost is cheap, can greatly reduce current interruption during welding Rate.

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

A kind of inverter type welder arc ignition circuit, including main transformer, striking transformer T1 and striking impulse circuit, the striking Transformer T1 secondary tandem is in inverter type welder negative output line, the primary and striking pulse of the striking transformer T1 Circuit is connected, and the striking impulse circuit includes dc source DC, resistance R1, R2, R3, electric capacity C1, C2, and diode D is two-way Diac DB, triode TR；The positive pole of the dc source DC connects a points, to b points after a point series resistances R1；Electric capacity C1's Positive pole connects b points, electric capacity C1 negative pole ground connection；A resistance R2 termination b points, resistance R2 another termination capacitor C2 one end and two Tie point c points between person connect bidirectional trigger diode DB one end, electric capacity C2 other end ground connection；Bidirectional trigger diode DB Another terminating resistor R3 one end, resistance R3 another termination triode TR base stage, triode TR grounded emitter, three Pole pipe TR colelctor electrode connects diode D anode and one end that striking transformer T1 is primary respectively, diode D negative electrode and The other end primary striking transformer T1 is connected with b points respectively.

Preferably, the primary and secondary turn ratio N1 of the striking transformer T1:N2=1:1.

Preferably, the voltage of the dc source DC is 80V.

The inverter type welder arc ignition circuit provided in above-mentioned technical proposal, 80V electricity is superimposed in the output end of former inverter type welder The continuous impulse of pressure a so that arcing initiation success rate improves, current interruption rate reduces；To avoid between welding terminal and arc ignition circuit Influence each other, it is 1 to increase primary and secondary turn ratio in welding terminal:1 striking transformer is isolated, striking transformer For secondary tandem on the cathode output end U0 of welding machine, primary connects striking impulse circuit, striking impulse circuit produce peak value be 80V, Frequency is that 50Hz continuous impulse is added in the primary of striking transformer, is that the secondary of striking transformer produces same superimposed pulses On welding machine output voltage, because striking pulse voltage is high so that current interruption rate is big when one time arcing initiation success rate is greatly improved, welded It is big to reduce.

The beneficial effects of the utility model are that circuit structure is simple, cost is cheap, before original welder performance is not changed Increase striking impulse circuit is put, the higher striking voltage of peak value is superimposed on the output voltage of welding machine, makes arcing initiation success rate big Big to improve, current interruption rate during welding substantially reduces, arc ignition circuit use impulse form, low in energy consumption, the output permission of arc ignition circuit Short circuit.

Brief description of the drawings

Fig. 1 is the schematic diagram of the utility model inverter type welder arc ignition circuit；

Fig. 2 is the welding machine idle voltage output oscillogram of superposition striking pulse.

Embodiment

In order that the purpose of this utility model and advantage are more clearly understood, the utility model is entered with reference to embodiments Row illustrates.It should be appreciated that following word is only to describe one or more of specific embodiments of the present utility model, Considered critical is not carried out to the protection domain of the specific request of the utility model.

Technical scheme that the utility model is taken is as shown in figure 1, a kind of inverter type welder arc ignition circuit, including main transformer 10th, striking transformer T1 and striking impulse circuit 20, the secondary tandem of the striking transformer T1 export in inverter type welder negative pole On line, the primary of the striking transformer T1 is connected with the striking impulse circuit 20, and the striking impulse circuit 20 includes Dc source DC, resistance R1, R2, R3, electric capacity C1, C2, diode D, bidirectional trigger diode DB, triode TR；The direct current Power supply DC positive pole connects a points, to b points after a point series resistances R1；Electric capacity C1 positive pole connects b points, electric capacity C1 negative pole ground connection；Electricity Hinder a R2 termination b points, resistance R2 another termination capacitor C2 one end and tie point c points between the two connect two-way triggering two Pole pipe DB one end, electric capacity C2 other end ground connection；Bidirectional trigger diode DB another terminating resistor R3 one end, resistance R3 Another termination triode TR base stage, triode TR grounded emitter, triode TR colelctor electrode connects diode D's respectively One end of anode and striking transformer T1 primary, the other end that diode D negative electrode and striking transformer T1 are primary are distinguished It is connected with b points.

The primary and secondary turn ratio N1 of the striking transformer T1:N2=1:1.The voltage of the dc source DC is 80V.

Bidirectional trigger diode DB model DB3 in the present embodiment, triode TR are Darlington triode, model TIP122。

Operation principle of the present utility model is：80V dc source DC is charged by resistance R1 for electric capacity C1, due to resistance R1, electric capacity C1 time constant are smaller, and b point voltages quickly reach 80V；At the same time b point voltages are electric capacity C2 by resistance R2 Charging, resistance R2, electric capacity C2 time constant are larger, about last 20ms, when electric capacity C2 on voltage i.e. c point voltages reach two-way tactile When sending out diode DB break over voltage, about 33V, bidirectional trigger diode DB is turned on and is entered negative resistance state, and electric capacity C2 passes through double Base current is injected to triode TR and discharge to diac DB, resistance R3, triode TR saturation conductions, striking transformer T1 primary obtains 80V crest voltages, and striking transformer T1 secondary is similarly obtained 80V induced voltages and is superimposed upon welding machine output electricity In pressure.Due to resistance R1 presence, b point voltages gradually reduce, electric capacity C1 electric discharges.When c points voltage is less than bidirectional trigger diode During DB blanking voltages, bidirectional trigger diode DB cut-offs are primary and secondary into high-impedance state, triode TR cut-offs, striking transformer T1 End-of-pulsing.Above procedure is then repeated, is gone round and begun again, makes striking transformer T1 is primary and secondary to produce peak value 80V, cycle about 20ms, frequency about 50Hz striking pulse, as shown in Figure 2.

It is striking transformer T1 primary coil afterflows that diode D, which is used for, in Fig. 1, is prevented because its back-emf punctures triode TR.Due to resistance R1 current limliting, even if striking transformer T1's is secondary when short-circuit caused by welding rod and weldment adhesion, also will not Burn triode TR.

In a word, inverter type welder arc ignition circuit provided by the utility model, circuit structure is simple, cost is low, and striking voltage is adopted With impulse form, striking power is small, low in energy consumption, and output allows short circuit.

Embodiment of the present utility model is explained in detail above in conjunction with accompanying drawing, but the utility model is not limited to Above-mentioned embodiment, for those skilled in the art, after content described in the utility model is known, On the premise of not departing from the utility model principle, some equal conversion can also be made to it and are substituted, these equal conversion and Replacement also should be regarded as belonging to the scope of protection of the utility model.

Claims (3)

1. a kind of inverter type welder arc ignition circuit, including main transformer, striking transformer T1 and striking impulse circuit, its feature exist In：The secondary tandem of the striking transformer T1 in inverter type welder negative output line, the striking transformer T1 primary with The striking impulse circuit is connected, the striking impulse circuit include dc source DC, resistance R1, R2, R3, electric capacity C1, C2, Diode D, bidirectional trigger diode DB, triode TR；The positive pole of the dc source DC connects a points, after a point series resistances R1 extremely B points；Electric capacity C1 positive pole connects b points, electric capacity C1 negative pole ground connection；A resistance R2 termination b points, resistance R2 another termination capacitor C2 one end and tie point c points between the two connect bidirectional trigger diode DB one end, electric capacity C2 other end ground connection；It is two-way Diac DB another terminating resistor R3 one end, resistance R3 another termination triode TR base stage, triode TR's Grounded emitter, triode TR colelctor electrode connect diode D anode and one end that striking transformer T1 is primary, two poles respectively The primary other end of pipe D negative electrode and striking transformer T1 is connected with b points respectively.

2. inverter type welder arc ignition circuit according to claim 1, it is characterised in that：The striking transformer T1's is first, secondary Level turn ratio N1:N2=1:1.

3. inverter type welder arc ignition circuit according to claim 1, it is characterised in that：The voltage of the dc source DC is 80V。