CN2146061Y - Multifunctional safety socket - Google Patents

Abstract

The utility model introduces a multifunctional safety socket in order to meet requirements of the safe operation of various electric appliances. The safety socket is realized by that an original socket is additionally provided with a protective tube and an overvoltage protection element. As a consequence, the multifunctional safety socket has functions of over-current protection and overvoltage protection. When the power supply voltage reaches the rated voltage protection value of the safety socket, the safety socket can cut off the power supply in time to protect the safety of electric appliances.

Description

Multifunctional safety socket

The utility model has related to electrical connector, specifically a kind of multifunctional protecting socket.Be applicable to being connected of various electrical appliances and power supply.

At present, along with the universal use of various household electrical appliance, it is more and more important that Electrical Safety has seemed, in the middle of this, to the most frequently used parts of power consumption equipment---and the improvement and the renewal of socket function have become the heat subject that people study.Manage to make socket when using as electrical connector; also has certain defencive function; the patent No. 89206173.1 once disclosed a kind of socket with overvoltage and overcurrent protection function, and promptly " multifunctional protecting socket " this socket is novel, rational in infrastructure and be subjected to the user and welcome.But the overvoltage protection of this safety socket is to realize by a Zinc-oxide piezoresistor that is attempted by in the internal circuit, is to utilize the high pressure on state characteristic of Zinc-oxide piezoresistor to realize with the overvoltage protection of electric loading.Because the Zinc-oxide piezoresistor conducting can not recover its primary characteristic after puncturing again, therefore need to change Zinc-oxide piezoresistor and just can make safety socket keep original function.Obviously very inconvenient.In addition because the not steep misoperation that causes protection device easily of volt-ampere characteristic of Zinc-oxide piezoresistor.

Be to release a kind of multifunctional protecting socket of simple in structure, easy to use, cheap, reliable operation, so that safety socket is able to higher generalization and use order of the present utility model.

Task of the present utility model is by protective tube of serial connection in the socket internal circuit and and connect a bidirectional triode thyristor and a resistance is realized.Bidirectional triode thyristor and resistance are attempted by in the load circuit of protective tube back.Bidirectional triode thyristor is a kind of very good switch element, and when not having trigger current or trigger current less than a certain value, bidirectional triode thyristor is in off state.Have only when gate pole feeds certain triggering Control current, bidirectional triode thyristor is conducting work, and after trigger current minimizing or the disappearance, bidirectional triode thyristor returns to off state again.The The Trigger of Bidirectional Triode Thyristor electric current is along with the change of supply voltage changes in the utility model.Thereby the conducting that makes bidirectional triode thyristor is subjected to the change of supply voltage with shutoff and changes.Specific practice is: two anodes of bidirectional triode thyristor are attempted by use the electric loading two ends, with resistance of cross-over connection between the gate pole of bidirectional triode thyristor and one of them anode.The withstand voltage of bidirectional triode thyristor will be higher than power supply accident voltage.The conducting electric current of bidirectional triode thyristor is greater than more than the twice of electric current protective tube nominal value.Resistance is determined by the resistance that supply voltage is elevated to when needing the bidirectional triode thyristor conducting.The utility model is to realize protection work like this: supply voltage just often, needed trigger current when the trigger current that injects gate pole by resistance is far smaller than the bidirectional triode thyristor conducting.Bidirectional triode thyristor is in off state, the circuit operate as normal.When supply voltage raises suddenly and reach the magnitude of voltage that needs protection, the trigger current the when electric current by resistance reaches the bidirectional triode thyristor conducting, bidirectional triode thyristor conducting; form short circuit, short circuit current fusing protective tube is cut off the electricity supply; protected electrical appliance, the bidirectional triode thyristor trigger current disappears.Bidirectional triode thyristor turn-offs, and supply voltage is normal.When short trouble appearred in electrical appliance, short circuit current fusing protective tube was cut off the electricity supply, and has guaranteed the work of safety socket normal reliable.

The utility model has been owing to adopted bidirectional triode thyristor as over-voltage protection element, not only prolonged the useful life of over-voltage protection element in circuit, and because the through-current capacity of bidirectional triode thyristor is big, no-spark during work, safe and reliable.Under AC and DC, high and low pressure state, all can use, widen the scope of application of safety socket greatly.

Protective tube in the utility model adopts socket connection, is convenient to replacing, bidirectional triode thyristor, resistance employing screw connection or welding, and installing and using, changing of socket is very convenient.

Specific embodiment of the utility model is provided by following accompanying drawing:

Fig. 1 is circuit theory diagrams of the present utility model

Fig. 2 is an internal structure schematic diagram of the present utility model

As scheming: (1) is protective tube, and (2) are bidirectional triode thyristor, and (3) are resistance, and (4) are conductive copper sheet, (5) be terminal screw, (6) are terminal screw, and (7) are terminal screw, and (8) are the protective tube reed, (9) be jack, (10) are insulating body, and (11) are spring.Power line is connected on respectively on terminal screw (5) and the terminal screw (6).Two anodes of bidirectional triode thyristor (2) are attempted by on terminal screw (5) and the terminal screw (7).The two ends of resistance (3) are connected on respectively on the gate pole and terminal screw (7) of bidirectional triode thyristor (2).Supply voltage just often, the very for a short time trigger current value that do not reach of the electric current of the resistance of flowing through (3).Bidirectional triode thyristor (2) is in off state, the socket normal power supply.When supply voltage raises when reaching overvoltage protection value of the present utility model for some reason, the electric current of the resistance of flowing through (3) increases and also reaches trigger current value, bidirectional triode thyristor (2) conducting; form short circuit; short circuit current fusing protective tube (1) is cut off the electricity supply, and has protected electrical appliance.

Claims (1)

1. A kind of by insulating body (10), terminal screw (5), (6), (7); the safety socket that conductive copper sheet (4), jack (9) are formed; a protective tube (1) is housed in the socket; it is characterized in that in socket, also being equipped with bidirectional triode thyristor (2) resistance (3) as over-voltage protection element; two anodes of bidirectional triode thyristor are connected on respectively on terminal screw (5) and (7), and the two ends of resistance (3) are connected on respectively on the gate pole and terminal screw (7) of bidirectional triode thyristor (2).