CN1044426A

CN1044426A - Transistorized arch welding inverter

Info

Publication number: CN1044426A
Application number: CN 89109052
Authority: CN
Inventors: 吴宪平; 方臣富
Original assignee: ZHENJIANG SHIP COLLEGE
Current assignee: ZHENJIANG SHIP COLLEGE
Priority date: 1989-12-01
Filing date: 1989-12-01
Publication date: 1990-08-08

Abstract

The present invention relates to a kind of transistorized arch welding inverter, can be used for multiple welding methods such as micro-plasma arc welding and argon tungsten-arc welding, be suitable for the welding of thin plate especially as welding equipment.This machine adopts high power transistor module to form fast switching circuit as the high-speed switch element; Enlarged output function, i.e. pulse and direct current output; Little current arc ignition circuit and short-circuit protection circuit have been set up; This machine cost is low, and volume is little, and is in light weight, saved electrical material, has realized shutting down automatically when little current arc ignition and external circuit short circuit duration surpass three seconds, has further improved the reliability and the welding technological properties of inverter.

Description

Transistorized arch welding inverter

The present invention relates to a kind of transistorized arch welding inverter, can be used for multiple welding methods such as micro-plasma arc welding and argon tungsten-arc welding, be suitable for the welding of thin plate especially as welding equipment.

Arc welding inverter is that the eighties begins to appear at the international market, be referred to as the 4th generation Arc Welding Power.1979 at first develop with the high-power thyristor in states such as the U.S., Holland, Denmark, Norway is the controllable silicon formula arc welding inverter of high-speed switch element, then developed again with the transistorized arch welding inverter of high power transistor as the high-speed switch element in Italy in 1981, nineteen eighty-three is developed FET arc welding inverter (CN85201941U) in Chinese South China Science ﹠ Engineering University.Electric arc instability when the little electric current of controllable silicon formula arc welding inverter welds, and have noise; Transistor type arc welding inverter arc stability, volume are little than the controllable silicon formula, and noiseless, but its control power is bigger, need the multitube related job, have equal flow problem, complex circuit, and need to solve the second breakdown problem; The contrary device frequency of FET arc-welding is up to 50000HZ, further reduced volume, but the FET saturation voltage drop is bigger, efficient can not be than the further improve of transistor type, need multitube parallel work simultaneously, and FET costs an arm and a leg, and works under too high reverse frequency, consider anti-interference problem; Arc welding inverter output impedance is little, the rush of current value is very high, unfavorable to welding procedure first during short-circuit arc, second influences the service life of rapidly switched tube.

The objective of the invention is to overcome the shortcoming of above-mentioned prior art; provide a kind of pulse direct current dual-purpose; adopted the transistorized arch welding inverter of a kind of novel little current arc ignition circuit and short-circuit protection circuit simultaneously, to improve the reliability and the welding procedure of inverter.

The main feature of transistorized arch welding inverter of the present invention is: adopt high power transistor module to form fast switching circuit as the high-speed switch element, both reduced production cost, make circuit design greatly simplify again, and reduced driving power, volume is little, and is in light weight, saved electrical material; Set up little current arc ignition circuit, realized little current arc ignition; Setting up of short-circuit protection circuit can make this machine shut down automatically when the short circuit time surpasses three seconds outside; The exportable DC current of this machine, the square wave pulse current of also exportable band forward position spike, electric arc was still highly stable when little electric current welded, and was suitable for the welding of thin plate especially.

Below in conjunction with accompanying drawing transistorized arch welding inverter of the present invention is elaborated.

Fig. 1: transistorized arch welding inverter basic principle block diagram of the present invention.

Wherein, 1, little current arc ignition circuit setting value, 2, selector switch, 3, direct-flow set value; 4, pulse setting value, 5, little current arc ignition circuit, 6, external characteristic control circuit, 7, electronic control circuit; 8, short-circuit protection circuit, 9, input rectifying, 10, the output rectification.

Fig. 2,3 transistorized arch welding inverter working circuit diagrams of the present invention, its component specification is seen attached list.

Transistorized arch welding inverter of the present invention by major loop, electronic control circuit, external characteristic control circuit, pulse direct current output circuit, little current arc ignition circuit, short-circuit protection circuit, have anti-inclined to one side pulse driving circuit and anti saturation circuit and form.

With reference to Fig. 1; the basic functional principle of transistorized arch welding inverter of the present invention: before the striking; little current arc ignition circuit is set at a smaller value with initial current; in the arc process; pass through current feedback; make the output current linear increment, reach welding current after, little current arc ignition circuit is deactivated automatically; selector switch can be selected direct current or pulse output as required; when inserting dc signal, the output Constant Direct Current is when inserting pulse signal; then export the square wave pulse current; when the external circuit short circuit duration surpasses three seconds, short-circuit protection circuit will force electronic control circuit to quit work, and complete machine turn-offs voluntarily.

Structure and duty with reference to Fig. 2,3 transistorized arch welding inverter each several parts of the present invention are as follows:

(1) major loop:

ZL ₁₀₁Be input rectifying, B ₁₀₁Be main transformer, BG ₁₀₁And BG ₁₀₂Be high power switch Darlington transistor module, D ₁₀₁And D ₁₀₂Be output rectification, V _IfBe welding current feedback signal, V _UfBe the executed arc voltage feedback signal.BG ₁₀₁And BG ₁₀₂Critical piece for full machine, constitute by a Darlington transistor module, owing to adopted this module, circuit arrangement is greatly simplified, and need not multitube parallel work, just there is not equal flow problem yet, also need not select the pipe pairing, the multiplication factor of its electric current can be up to more than 100, and therefore required driving power is minimum, absorb network owing to inserted RC, see the C among Fig. 2 ₁₀₈, C ₁₀₉, R ₁₁₉, R ₁₂₀, make transistor avoid high power consumption district, solved the second breakdown problem.

B ₁₀₁Adopt ferrite 'E' core, specification is EF ₂₀, two secondary uses side by side unshakable in one's determination:

Net sectional area Ae=1568mm unshakable in one's determination ²

Inductance coefficent Al=6500

Average length of magnetic path Le=141mm

Elementary umber of turn N ₁=17 circles

Secondary windings number of turn N ₂=5+5 circle

(2) electronic control circuit:

By IC ₄And peripheral circuit is formed IC ₄Adopt W ₃₄₂₀Or W ₃₅₂₀, this circuit is exported the control impuls of 180 ° of two groups of phase phasic differences, and frequency is 2000HZ, and its pulse width is by little current arc ignition circuit and external characteristic control circuit control.

(3) voltage-stabilized power supply:

By B ₂₀₁And IC ₁And peripheral circuit is formed.

(4) external characteristic control circuit

By A ₂And the peripheral circuit composition, work as K ₃₀₁When inserting dc signal, the output direct current is worked as K ₃₀₁When inserting pulse signal, then export the pulse welding current.

(5) pulse direct current output circuit:

By R ₃₁₆, W ₃₀₄And R ₃₂₈Form the given signal of direct current, regulate W ₃₀₄Can regulate output DC stream size; By IC ₃Two groups of amplifier A ₃, A ₄And peripheral circuit constitutes impulse circuit, wherein W ₃₀₇, D ₃₀₇And C ₃₀₇Form the burst length, R ₃₁₉, W ₃₀₆, R ₃₁₇Form the pulse signal circuit, the pulse frequency adjusting range is 0.5-200HZ, transfers W ₃₀₇Be the adjustable burst length, W ₃₀₆Adjustable pulse amplitude; C ₃₀₇, D ₃₀₆And W ₃₀₈Form the arc maintenance time, R ₃₀₇, W ₃₀₃, R ₃₀₈Form the arc maintenance signal circuit, transfer W ₃₀₈Can adjust the arc maintenance time, W ₃₀₃The adjustable dimension arc current; D ₃₀₇, W ₃₀₇With D ₃₀₆, W ₃₀₈Reverse parallel connection is with independent regulation burst length and arc maintenance time, K ₃₀₁For direct current or pulse choice switch, by K ₃₀₁Carry out direct current or pulse choice, to by A ₂And the external characteristics circuit that peripheral circuit is formed controls, to obtain direct current or pulse output.

(6) little current arc ignition circuit

By A ₁And peripheral circuit is formed C ₃₀₆At R ₃₁₁And R ₃₁₃Between draw ground connection, pass through W ₃₀₅, R ₃₁₁, C ₃₀₆, R ₃₁₃Set the striking initial current,, setting value changed continuously by current feedback, rise to the setting value of external characteristic control circuit when output current after, D ₃₀₂Be reverse biased D ₃₀₃Conducting, little current arc ignition circuit is deactivated, and external characteristic control circuit enters duty, exports normal welding current.

(7) short-circuit protection circuit

By IC ₂And peripheral circuit is formed R ₁₁₂, D ₁₀₄, C ₁₀₆Be attempted by power output end, to obtain the output voltage signal, with control IC ₂, IC ₂1,2 pin be serially connected in power supply and IC ₄10 pin between, with control IC ₄The break-make of power supply.During normal the welding, voltage feedback signal V _UfMake IC ₂1,2 pin connect, provide power supply to electronic control circuit, when the external circuit short circuit, C ₁₀₆Discharge off, V _UfEqual zero, make IC ₂1,2 pin disconnect, the electronic control circuit outage, the no-output pulse, complete machine automatically shuts down.

(8) have anti-inclined to one side pulse driving circuit:

By B ₁₀₂, B ₁₀₃And D ₁₁₁With D ₁₁₂Form B ₁₀₂, B ₁₀₃Elementary employing centre cap formula, D ₁₁₁With D ₁₁₂Be serially connected in B respectively ₁₀₂And B ₁₀₃Primary side, behind end-of-pulsing, produce one and pass through D ₁₁₁With D ₁₁₂Reversing the current, to obtain anti-output partially.

(9) anti saturation circuit

By D ₁₀₅, D ₁₀₇, D ₁₀₈, D ₁₁₀Form D ₁₀₇With D ₁₀₅Be total to anode, D ₁₁₀With D ₁₀₈Be total to anode, D ₁₀₇And D ₁₁₀Negative electrode be connected to BG respectively ₁₀₁With BG ₁₀₂Base stage, D ₁₀₅With D ₁₀₈Negative electrode be connected to BG respectively ₁₀₁With BG ₁₀₂Colelctor electrode, when supersaturation, D ₁₀₅And D ₁₀₈Unnecessary electric current is caused BG ₁₀₁And BG ₁₀₂Colelctor electrode, to reach the anti-saturation purpose.

According to the selected components and parts of subordinate list, the output current scope that this machine can reach is the 4-63 ampere.

Compared with the prior art the present invention has following advantage and effect:

1, owing to adopted pulse and the given signal selection circuit of direct current, realized direct current With two kinds of functions of pulse output, the broad 0.5-200HZ of pulse output frequency adjustable range has enlarged the adaptability of technology, is conducive to the welding of full position and little electric current.

2, adopt little current arc ignition circuit, realized little current arc ignition, so that the short circuit surge current greatly reduces, avoided workpiece because of the pollution that short-circuit arc causes, improved processing performance, also avoided transistor to flow through too high electric current simultaneously, improved reliability.

3, owing to adopted short-circuit protection circuit, when the short circuit time surpassed three seconds outside, inverter automatically shut down, and avoided arc welding inverter because of the damage that long-time short circuit causes, and had further improved reliability.

4, owing to adopted anti-inclined to one side drive circuit and the anti saturation circuit of band, shorten transistorized waiting time and quickened the shutoff decrease speed, made transistor improve anti-second breakdown ability, also improved reverse frequency simultaneously.

5,,, has good welding technological properties so the various welding conditions of control accuracy height can accurately be controlled because the external characteristics circuit that adopts can be realized fast reaction.

6, owing to adopted the Darlington module, avoided the transistor parallel operation, control power simultaneously and greatly reduce, thereby circuit design has been fairly simple.

7, compare with conventional Arc Welding Power, saved a large amount of electrical materials, as copper and silicon steel sheet, weight also reduces therefrom significantly.

8, compare with the analogue-digital conversion Arc Welding Power with arc generator, efficient has improved 60%, has saved the energy.

Claims

1, a kind of transistorized arch welding inverter of forming by major loop, electronic control circuit, voltage-stabilized power supply, external characteristic control circuit; it is characterized in that having the pulse direct current output circuit, little current arc ignition circuit, short-circuit protection circuit, have anti-inclined to one side pulse driving circuit and anti saturation circuit.

2, transistorized arch welding inverter according to claim 1 is characterized in that the pulse direct current output circuit is by R ₃₁₆, W ₃₀₄And R ₃₂₈Form the given signal of direct current; By IC ₃Two groups of amplifier A ₃, A ₄And peripheral circuit constitutes impulse circuit, wherein W ₃₀₇, D ₃₀₇And C ₃₀₇Form the burst length, R ₃₁₉, W ₃₀₆, R ₃₁₇Form the pulse signal circuit; C ₃₀₇, D ₃₀₆And W ₃₀₈Form the arc maintenance time, R ₃₀₇, W ₃₀₃, R ₃₀₈Form the arc maintenance signal circuit, D ₃₀₇, W ₃₀₇With D ₃₀₆, W ₃₀₈Reverse parallel connection; K ₃₀₁Selector switch for direct current or pulse.

3, transistorized arch welding inverter according to claim 1 is characterized in that little current arc ignition circuit is by A ₁And peripheral circuit is formed C ₃₀₆At R ₃₁₁And R ₃₁₃Between draw ground connection.

4, transistorized arch welding inverter according to claim 1 is characterized in that short-circuit protection circuit is by IC ₂And peripheral circuit is formed R ₁₁₂, D ₁₀₄, C ₁₀₆Be attempted by circuit output end, IC ₂1,2 pin be serially connected in power supply and IC ₄10 pin between.

5, transistorized arch welding inverter according to claim 1 is characterized in that having anti-inclined to one side pulse driving circuit by B ₁₀₂, B ₁₀₃And D ₁₁₁And D ₁₁₂Form B ₁₀₂, B ₁₀₃Elementary employing centre cap formula, D ₁₁₁And D ₁₁₂Be serially connected in B respectively ₁₀₂And B ₁₀₃Primary side.

6, transistorized arch welding inverter according to claim 1 is characterized in that anti saturation circuit is by D ₁₀₅, D ₁₀₇, D ₁₀₈, D ₁₁₀Form D ₁₀₇With D ₁₀₅Be total to anode, D ₁₁₀With D ₁₀₈Be total to anode, D ₁₀₇And D ₁₁₀Negative electrode be connected to BG respectively ₁₀₁With BG ₁₀₂Base stage, D ₁₀₅With D ₁₀₈Negative electrode be connected to BG respectively ₁₀₁With BG ₁₀₂Colelctor electrode.