CN2165550Y

CN2165550Y - Safety device for household electric appliances

Info

Publication number: CN2165550Y
Application number: CN 93223781
Authority: CN
Inventors: 石元文
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-09-13
Filing date: 1993-09-13
Publication date: 1994-05-18
Anticipated expiration: 2003-09-13

Abstract

The utility model relates to a safety device for household electric appliances, composed of a transformer, a bleeder circuit, a controlled silicon, and a fuse, wherein, the controlled silicon is connected in parallel with the load of a power supply, the bleeder circuit is connected between the two poles of the power supply, the connecting point is connected with the trigger foot of the controlled silicon, and the output end of the transformer is also connected with the trigger foot of the controlled silicon. The matching working of the bleeder circuit, the controlled silicon, and the fuse has the function of protecting the household appliances; the matching working of the transformer, the controlled silicon, and the fuse has the functions of preventing electrical leakage and protecting personal safety. The utility model has the advantages of complete function, reliable working, low cost, and small size; the complete set of the circuit can be arranged in a common power socket; the utility model can not lose effect after reserved for a long time.

Description

Safety device for household electric appliances

The utility model relates to a kind of safe protector for domestic electric apparatus.

Various household electrical appliance bring a lot of facilities for people's life, but also exist some hidden danger simultaneously, mainly are: one, and the line voltage instability when especially voltage is higher, can produces household electrical appliance and destroy.Two, household electrical appliance in use may produce leaky, thereby cause personal injury.Safe protector for domestic electric apparatus of the prior art mainly is the earth leakage protective device that utilizes instrument transformer to cooperate relay to constitute; there is the shortcoming that cost is higher, volume is bigger than normal in this product; because household electrical appliance all are to work under following normal state usually; rare leaky; so its relay seldom moves; be in idle state of normal phase, be easy to make relay to lose efficacy, the functional reliability of this protector just is difficult to satisfactory.In addition, present protector for household electrical appliances function singleness can not have overvoltage and two kinds of defencive functions of electric leakage simultaneously.

The purpose of this utility model is to provide a kind of novel safe protector for domestic electric apparatus.To address the above problem.

The technical solution that the utility model adopted is: whole protector mainly is made of instrument transformer, bleeder circuit, controllable silicon and fuse.Wherein, fuse is connected on the live wire of power supply, and controllable silicon is in parallel with the load of power supply, and bleeder circuit is connected between the two poles of the earth of power supply, and its node is connected silicon controlled and triggers on the pin, and the output of instrument transformer also is connected on silicon controlled and triggers on the pin.When line voltage was too high, the node by bleeder circuit was delivered to silicon controlled with a higher voltage and is triggered pin, makes the controllable silicon conducting, and power supply short circuit is fuse opening, thereby played the effect of protection household electrical appliance.When leaky took place, the output by instrument transformer was delivered to silicon controlled with a higher voltage and is triggered pin, makes the controllable silicon conducting, and power supply short circuit is fuse opening, thereby played the effect of protection personal safety.

The utility model has the advantages that multiple functional, reliable operation, cost is low, volume is little, a whole set of circuit can be installed in the general supply socket, and it can not lose efficacy because of putting for a long time.

Below in conjunction with embodiment the utility model is further described.

Accompanying drawing: the circuit diagram of a kind of embodiment of the utility model.

As shown in the figure, employed circuit is to constitute like this in this example, the output of instrument transformer L1 is connected the trigger end of controllable silicon D1 by the filter circuit of being made of capacitor C 1, resistance R 1, described bleeder circuit is made up of resistance R 2, R3, its node is by voltage stabilizing didoe D2 and be connected the trigger end of controllable silicon D1 by the filter circuit that capacitor C 2, resistance R 4 are formed, controllable silicon D1 is in parallel with load R, fuse A is connected on the live wire of power supply, in this example, also be provided with a fuse A relay indicating light L, it is connected in parallel on the fuse A by current-limiting resistance R5.During operate as normal, the output no signal output of instrument transformer, the node voltage of bleeder circuit is lower, not conducting of voltage stabilizing didoe D2, simultaneously, the output no signal output of instrument transformer, so the silicon controlled trigger end is a low level, controllable silicon ends, and power supply is to the load normal power supply, indicator light L both end voltage is substantially zero, and this indicator light does not work.When line voltage was too high, the node place voltage of bleeder circuit raise, and makes voltage stabilizing didoe D2 conducting, and the trigger end of controllable silicon D1 obtains triggering signal, so the controllable silicon conducting, power supply short circuit is with fuse opening, and power supply is stopped power supply.Because fuse A is blown and the controllable silicon conducting, no-voltage in the load, thus playing the effect of protecting household electrical appliance, indicator light L both end voltage raises the luminous warning of indicator light L simultaneously.When household electrical appliance generation leaky, the output voltage of instrument transformer raises, and the trigger end of controllable silicon D1 obtains triggering signal, so the controllable silicon conducting, power supply short circuit blows fuse A, and power supply is stopped power supply.Because fuse A is blown and the controllable silicon conducting, no-voltage in the load, thus playing the effect that guarantees personal safety, indicator light L both end voltage raises the luminous warning of indicator light L simultaneously.

Claims

1, a kind of safe protector for domestic electric apparatus is made up of testing circuit, controllable silicon and the relay that is used to cut off the electricity supply, it is characterized in that controllable silicon (D1) that is in parallel by testing circuit, with household electrical appliance and the fuse (A) that is used to cut off the electricity supply form.

2, safe protector for domestic electric apparatus as claimed in claim 1, it is characterized in that described testing circuit comprises an instrument transformer (L1) and a bleeder circuit by resistance (R2, R3) formation, the node of bleeder circuit all is connected by the trigger end of rectification circuit with controllable silicon (D1) with the output of instrument transformer.