CN2166514Y

CN2166514Y - Non-arc discharging apparatus for AC contactor

Info

Publication number: CN2166514Y
Application number: CN93216126U
Authority: CN
Inventors: 蔡和平
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-06-17
Filing date: 1993-06-17
Publication date: 1994-05-25
Anticipated expiration: 2003-06-17
Also published as: AU6840594A; WO1995000962A1

Abstract

The utility model relates to the non-arc discharging apparatus of a contactor, which makes an alternating current circuit have a non-arc discharging circuit at the moment that the alternating current circuit is switched on and switched off. The utility model is formed by thyristors. The utility model is characterized in that the gate electrodes of the thyristors in a discharging circuit is connected with one of the phases of the opposite contactors of the instant voltages that the contactor generates in the process of the on-off of the contactor and the opposite contactors, the gate electrodes of the thyristors and the cathodes of the thyristors constitute the triggering loop of the gate electrodes. The utility model has the advantages of simple structure, low cost, reliable work, etc. The utility model can be widely used in the switch structures of circuit brakes, starters, relays, etc.

Description

Non-arc discharging apparatus for AC contactor

The utility model relates to a kind of contactor that utilizes thyristor to form can to make alternating current circuit break-make moment and do not have the arc discharge loop does not have the arc discharge device.

On the 548th page of in October, 1992 " low-voltage electrical apparatus design manual " that China Machine Press publishes, disclose a kind of A.C. contactor and do not had arc discharge device (as shown in Figure 1).Be to constitute thyristor door-plate circuits for triggering by inductor.Its shortcoming is complex structure, need the supplementary protection circuit and during contact closure gate circuit transistor gate exist the size of trigger current and controlled electric current to be restricted etc. always.

Also disclosing application number in the Chinese patent gazette on March 8th, 1989 is 88211900.1 " a kind of no arc discharge device ".Its structure is made up of electric devices such as bidirectional thyristor, capacitor, rectifier and transformers.Its shortcoming is that still complexity and adaptability are restricted structure.

The purpose of this utility model is to overcome above-mentioned shortcoming of the prior art and does not provide a kind of simple in structure, adaptability by force, reliably A.C. contactor does not have the arc discharge device efficiently.

The purpose of this utility model can reach by following structure:

A.C. contactor does not have the arc discharge device.Comprise contactor power supply input and output contact, assist control contact and unidirectional or bidirectional thyristor, and connect the discharge loop that forms with the contactor input/output terminal respectively by thyristor negative and positive end.Special feature of the present utility model is that the moving contact in the relative contact that can produce instantaneous voltage in make and break process of gate circuit transistor gate and contactor in the discharge loop links, and this relative contact and thyristor gate, negative electrode constitute gate pole and trigger the loop.Specifically, when adopting unidirectional thyristor and bridge contact contactor, connect with the contactor input/output terminal respectively by two ends after the anode and cathode inverse parallel of two unidirectional thyristors and to constitute discharge loop, each gate pole of two unidirectional thyristors rectifier diode of connecting respectively, linking with contactor bridge-type moving contact after two diode anode parallel connections constitutes two-way triggering loop; When adopting bidirectional thyristor and bridge contact contactor, connected with the contactor input/output terminal respectively by first, second anode two ends of a bidirectional thyristor and to constitute discharge loop, the gate pole of bidirectional thyristor and contactor bridge-type moving contact link and constitute two-way triggering loop; When adopting unidirectional thyristor and finger contact contactor, connected with the contactor input/output terminal respectively by two ends after the anode and cathode inverse parallel of two unidirectional thyristors and to constitute discharge loop, the auxiliary contact that each gate pole of two unidirectional brilliant locks is relative with contactor respectively link and constitute two-way gate pole pipe and trigger the loop mutually; When adopting bidirectional thyristor and finger contact contactor, connect with the contactor input/output terminal respectively by first, second anode two ends of a bidirectional thyristor and to constitute discharge loop, one of auxiliary contact that the gate pole of bidirectional thyristor is relative with contactor connect, and another auxiliary contact connect the two-way triggering of formation loop with second plate.In order to realize the complete air disjunction of circuit, the delay switch of can between contactor input and discharge loop, connecting, its time of delay should be greater than 10 milliseconds.

That the utility model has compared to existing technology is simple in structure, with low cost, easy to manufacture, the gate circuit transistor gate parameter area is wide, reliable operation, long service life and adaptability are strong, can be widely used in the advantage in the ac electric apparatus constructions of switch such as circuit breaker, starter, relay.

The drawing of accompanying drawing is described as follows:

Fig. 1 is that a kind of A.C. contactor in the prior art does not have arc discharge apparatus structure schematic diagram.

Fig. 2 is one of a utility model specific embodiment structural representation.

Fig. 3 is two structural representations of the utility model specific embodiment.

Fig. 4 is three structural representations of the utility model specific embodiment.

Fig. 5 is four structural representations of the utility model specific embodiment.

The utility model is described in further detail below in conjunction with concrete enforcement shown in the accompanying drawing:

Fig. 2 is a most preferred embodiment of the present utility model, wherein thyristor T ₁, T ₂Be connected on by C after the inverse parallel ₂, C ₃The bridge-type fixed contact two ends that constitute.Its effect is the side-arcing electric current, used T ₁, T ₂Be 20A/1000VKP type triode thyristor.Diode D ₁, D ₂Negative electrode is connected on T respectively ₁, T ₂On the gate pole, be connected on by C by little spring t after the negative electrode parallel connection ₁On the bridge-type moving contact that constitutes, its effect is when utilizing the contact action, moving contact C ₁The instantaneous voltage of last generation triggers thyristor T ₁, or T ₂Used D ₁, D ₂Be the common rectifier diode of 1N4007 type.Bridge contact C ₁, C ₂, C ₃The electric current of make-and-break ability be 40A/380V.Its course of work is: when contact system closed moment, and moving contact C ₁On will produce relative fixed contact C ₂Or C ₃The forward instantaneous voltage.This voltage is by t and D ₁Or D ₂Trigger T ₁Or T ₂Make its conducting, thereby with the arc current bypass.Concrete T ₁And T ₂Which thyristor conducting is then born forward voltage on contact action which thyristor of moment and is decided.After contact system is stable at closure state, the thyristor T of conducting ₁Or T ₂By contact C ₁Short circuit and turn-offing, this moment D ₁, D ₂And T ₁, T ₂Quit work owing to being on the same current potential.When contact system disjunction moment, moving contact C ₁On will produce relative C ₂Or C ₃The forward instantaneous voltage, this voltage passes through D again ₁Or D ₂Trigger T ₁Or T ₂Make its conducting, thereby with the arc current bypass.At C ₁Divide fully and have no progeny T ₁Or T ₂Lose triggering signal and natural zero-crossing shutoff in a cycle.So far, a course of work finishes.D ₁And D ₂Another effect be to prevent at T ₁Or T ₂When being in off-state, mislead by the gate pole electric leakage.

Fig. 3 is by the unidirectional thyristor T in the two-way brilliant pipe closer alternate figures 2 of KS ₁And T ₂Its course of work and last example are basic identical.

The no arc discharge device that the utility model is related also goes for the single contact contactor that line contacts finger contact or other form.To the single contact contact system, can utilize contactor auxiliary contact or additional auxiliary contact that unidirectional thyristor or bidirectional thyristor are triggered.The used thyristor T of Fig. 4 ₁, T ₂Be the plain edition unidirectional thyristor.The used thyristor KS of Fig. 5 is common bidirectional thyristor.J is the contactor auxiliary contact among Fig. 4 and Fig. 5, C ₁And C ₂Be respectively moving contact and fixed contact in the contactor main contacts, g is the contact insulated connecting rod.T among Fig. 4 ₁And T ₂Triggering be to utilize T ₁, T ₂The gate pole leakage current triggers mutually by auxiliary contact J.The triggering of KS is when moving by auxiliary contact among Fig. 5, and the instantaneous voltage that produces between gate pole and second plate is realized.

Claims

1, A.C. contactor does not have the arc discharge device, comprise by the thyristor negative and positive and extremely connect the discharge loop that forms with the contactor input/output terminal respectively, it is characterized in that the moving contact in the relative contact that can produce instantaneous voltage in make and break process of gate circuit transistor gate and contactor in the discharge loop links, this relative contact and thyristor gate, negative electrode constitute and trigger the loop.

2, A.C. contactor according to claim 1 does not have the arc discharge device, it is characterized in that connecting with the contactor input/output terminal respectively and constitute discharge loop by two ends after the anode and cathode inverse parallel of two unidirectional thyristors, each gate pole of two unidirectional thyristors rectifier diode of connecting respectively, linking with contactor bridge-type moving contact after the two diode anode parallel connections constitutes two-way triggering loop.

3, A.C. contactor according to claim 1 does not have the arc discharge device, it is characterized in that first, second anode two ends by a bidirectional thyristor connect with the contactor input/output terminal respectively constitutes discharge loop, and the gate pole of bidirectional thyristor and contactor bridge-type moving contact link and constitute two-way triggering loop.

4, A.C. contactor according to claim 1 does not have the arc discharge device, it is characterized in that for the finger contact contactor, connected with the contactor input/output terminal respectively by two ends after the anode and cathode inverse parallel of two unidirectional thyristors and to constitute discharge loop, the auxiliary contact that each gate pole of two unidirectional thyristors is relative with contactor respectively link and constitute two-way gate pole and trigger the loop mutually.

5, A.C. contactor according to claim 1 does not have the arc discharge device, it is characterized in that for the finger contact contactor, connect with the contactor input/output terminal respectively by first, second anode two ends of a bidirectional thyristor and to constitute discharge loop, one of auxiliary contact that the gate pole of bidirectional thyristor is relative with contactor connect, and another auxiliary contact connect the two-way triggering of formation loop with second plate.