CN2265867Y

CN2265867Y - Super microcrystalline iron core single-end inverse DC welder

Info

Publication number: CN2265867Y
Application number: CN 96249841
Authority: CN
Inventors: 蒋冠珞; 祁琦
Original assignee: Jiangxi Dayou Science & Technology Co Ltd
Current assignee: Jiangxi Dayou Science & Technology Co Ltd
Priority date: 1996-12-30
Filing date: 1996-12-30
Publication date: 1997-10-29
Anticipated expiration: 2006-12-30

Abstract

The utility model relates to the technical field of metal welding, particularly a super microcrystalline iron core single-end inverse DC electric welder which is applied during the metal welding process. The transformer of the electric welder is made of microcrystal iron cores. The magnetic parameter and the process are selected reasonably as so to ensure the lowest loss of the transformer and the lowest residual magnetism. In order to gain required output with large power, the technique that a plurality of single-end inverse circuit units are connected in parallel is adopted, which causes the utility model to gain output with large power, enhancing the working effect and ensuring favorable constant current characteristic. The circuit construction is reasonable, and consequently, the phenomenon of damaging components caused by faulty conduction is avoided, which ensures the operating reliability.

Description

The single-ended inversion type direct-current welding machine of ultracrystallite iron core

The utility model relates to the metal welding techniques field, particularly a kind ofly is used for the single-ended inversion type direct-current welding machine of ultracrystallite iron core that metal solder is used.

In the prior art, dc welding machine generally is to take full-bridge type and half bridge circuit.Though this structure is the transformer utilization factor height, be easy to make more powerful electric welding machine, yet there is tangible deficiency in it, the first is easy to generate magnetic bias, causes core sataration.It two is to mislead easily, causes power supply short circuit.Above-mentioned two kinds of situations all very easily cause the damage of high power transistor.Because the electric welding machine reverse frequency is very high, therefore, wrong slightly control just will produce serious consequence.

For solving the shortcoming that exists in the prior art, the purpose of this utility model just is to provide a kind of single-ended inversion type direct-current welding machine of ultracrystallite iron core of high reliability, this electric welding machine adopts and constitutes single-ended contravariant circuit by inversion and transducing rectifying part, the ultracrystallite iron core is manufactured transformer, a plurality of single-ended inverter circuit parallel connections are adopted on former limit, secondary also adopts the parallel connection of a plurality of transducing rectification circuit, and from the current divider output current signal to controller, compare with given current signal, in time adjust the pulse width of triggering signal, form closed-loop control, thereby guarantee constant current output.For obtaining high-power output, can be with the parallel connection of a plurality of single-ended contravariant circuit.For guarantee transformer on make efficient, the utility model adopts the ultracrystallite iron core to make transformer, choose reasonable magnetic parameter (iron core process other patent) is to guarantee low-loss, low remanent magnetism.

Now reach embodiment in conjunction with the accompanying drawings and further set forth the utility model architectural feature and operation principle thereof.

Fig. 1 is the utility model scheme circuit block diagram.Wherein 1 is power unit, and 2 is the single-ended contravariant circuit part that inversion and transducing partly constitute, and 3 is output, and 4 is the controller part.Wherein S represents three-phase alternating-current supply, and W represents the output of electric welding machine direct current.

Fig. 2 is the utility model schematic circuit, and wherein M is a current divider.

Fig. 3 is the utility model schematic appearance.Wherein 1 is the inversion type direct-current welding machine housing, and 2 is the electric current dial gauge, and 3 is the voltage dial gauge, and 4 is that electric current is given, and 5 is that thrust is given, and 6 is start button, and 7 is stop button, and 8 is soldering set, and 9 is shell holder, and 10 is that migration is rolled.

Fig. 4 is a controller output pulse signal oscillogram.

Referring to Fig. 2, the full-wave rectification that three phase mains S forms through D1-D6 is that DC voltage is switch transistor T with ac voltage rectifier after filter capacitor C filtering ₁, T ₂Power supply.T ₁The emitter stage of switching tube is by transformer B ₁Former limit N ₁₁With T ₂The colelctor electrode C of switching tube ₂Connect former limit N ₁₁Two ends are by diode D ₁₃, D ₁₄Join with negative, positive two ends of dc source respectively, to guarantee T ₁, T ₂When pipe turn-offs, line chart N ₁₁The peak value of back voltage that produces is clamped on the supply voltage of twice.T ₁, T ₂The corresponding output square-wave signal with controller of base stage end realizes that circuit is connected, as pulse triggering signal.C ₁₁, R ₁₁, D ₁₁And C ₁₂, R ₁₂, D ₁₂Form two cover clutters respectively and absorb circuit, be connected in parallel on switch transistor T ₁And T ₂Between the emitter and collector, to reduce switch transistor T ₁, T ₂Open, breakdown consumption.Transformer B ₁Secondary N ₁₂End of the same name and commutation diode D ₁₅Positive pole join diode cathode and continued flow tube D ₁₆Negative pole join and be connected to welding terminal, N ₁₂The other end and continued flow tube D ₁₆Anodal connection is also passed through inductance L ₃, current divider M is to the other end of welding terminal, sampled signal F ₁, F ₂Feed back to controller.The dead load R that welding machine must have _LBe connected in parallel on welding terminal, be used for when welding machine quits work, keeping minimum current.For guaranteeing transformer B ₁Be positive polarity output, the winding of transformer and lead-in wire should be according to secondary N ₁₂End of the same name and D ₁₅Positive pole be connected, in addition end then with continued flow tube D ₁₆Positive pole join.

T ₃, T ₄And T ₅, T ₆Be respectively two separate units in addition, the same T of its structure ₁, T ₂Formed single-ended inversion and transducing part are identical.The single-ended inverter circuit of a plurality of independences unit is can be respectively in parallel with input, output, so that form high-power output.Geosutures in the accompanying drawing 2, promptly expression is by desired output power, a suitable n in parallel separate unit.

Now in conjunction with the accompanying drawings 2, with T ₁, T ₂Separate unit of single-ended contravariant circuit is an example, sets forth the utility model operation principle:

Because ultracrystallite transformer B ₁Former sideline figure N ₁₁Be serially connected in power switch pipe T ₁, T ₂Between do load, work as switch transistor T ₁, T ₂Simultaneously under the triggering of square-wave signal during conducting, N ₁₁There is electric current to pass through, transformer B ₁Secondary N ₁₂Produce an induced potential e, its polarity such as Fig. 2, end promptly of the same name is for just, because former limit N ₁₁With secondary N ₁₂Turn ratio much larger than 1, therefore, just with B ₁The high voltage-small current signal transition of former limit one side is B ₁Secondary one side low-voltage, high-current signal.Work as T ₁, T ₂During conducting, according to the contravariant design principle, this moment D ₁₅Be in positive bias and conducting, output current is through load R _LAnd work done; Work as T ₁, T ₂When ending, because reactor L ₃The afterflow effect and make L ₃On energy storage pass through D ₁₆Discharge is to maintain R _LOn electric current.Current divider M output signal F ₁, F ₂Compare to control circuit, with given signal, when deviation, then change the width (referring to Fig. 4) of impulse waveform in order to control T by control circuit ₁, T ₂ON time, realize that output current gets back to set-point, whole system forms closed loop tracking system, thereby guarantees splendid constant-current characteristics, to satisfy workpiece is welded needed operating current.

The utility model is in order to realize high-power output, take a plurality of inversions and transducing unit in parallel with input, output respectively, be about to the same circuit structure a plurality of single-ended inverter circuit consistent and be connected in parallel on capacitor C and sustained diode according to actual needs respectively with component parameters ₁₆Two ends.Though this is that owing to single-end circuit has only utilized first quartile to the ultracrystallite transformer, thereby power is unfit to do too greatly because single-ended inversion direct current welding machine has anti-magnetic bias and advantage such as false triggering does not take place.The utility model is then taked a plurality of cellular constructions, and promptly per two switching tubes are (with T ₁, T ₂Be example) corresponding two cover clutter absorption circuit C ₁₁, R ₁₁, D ₁₁And C ₁₂, R ₁₂, D ₁₂And sustained diode ₁₃, D ₁₄, transformer B and appended rectifying output circuit, constitute a separate unit.A plurality of like this unit are in input, output parallel connection.Form high-power output.Fig. 2 is exactly three unit output in parallel example, can make four according to the needs of power output, five to n.

Implement the utility model, will produce following technique effect:

1, because line construction rationally reaches the magnetic parameter of high-quality selection of Transformers and choose reasonable ultracrystallite, make the transformer own loss extremely low, remanent magnetism is extremely low, guarantees not magnetic bias.

2, the problem that can not produce misleading, thereby the reliability of the work of assurance.

3, adopt a plurality of single-ended contravariant circuit export technique in parallel, overcome the little shortcoming of single-end circuit power, can form n unit in input, output parallel connection according to actual needs, to improve power.

4, because whole circuit is realized closed-loop control, make output current in time get back to set-point, thereby can guarantee splendid constant-current characteristics.

Claims

1, the single-ended inversion type direct-current welding machine of a kind of ultracrystallite iron core, comprise power unit, control section, it is characterized in that adopting and constitute single-ended contravariant circuit by inversion and transducing rectification, ultracrystallite appendiron core transformer, former limit adopt a plurality of inverter circuit parallel connections, and secondary also adopts a plurality of rectification circuit parallel connections, and from the current divider output signal of telecommunication to control section, the control section output links to each other with single-ended contravariant contactor pipe base stage.

2, the single-ended inversion type direct-current welding machine of a kind of ultracrystallite iron core according to claim 1, it is characterized in that in the described single-ended contravariant circuit unit, the former limit N11 of transformer B1 connects with T2 switching tube colelctor electrode, and be connected to positive source by diode reverse, the end of the same name on former limit is connected with the T1 emitter stage and links to each other with power supply negative terminal by the diode reverse connection, clutter absorbs circuit and is connected across switch transistor T 1 respectively, between T2 emitter stage and the colelctor electrode, the end of the same name of the secondary N12 of transformer B1 is connected with the commutation diode forward and is connected to load one end, the other end of N12 and fly-wheel diode positive pole join, and press to the load other end by inductance L 3 and current divider M.