CN2111595U

CN2111595U - Multi-functional electronic switch

Info

Publication number: CN2111595U
Application number: CN 92202181
Authority: CN
Inventors: 吴伟
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-01-30
Filing date: 1992-01-30
Publication date: 1992-07-29

Abstract

The utility model discloses a multi-functional electronic switch which is widely used in various alarm circuits. The multi-functional electronic switch has the functions of a thyristor switch and a delay switch, and the cost of the multi-functional electronic switch is one third of the thyristor switch. The multi-functional electronic switch (1) is composed of a transistor (2), a capacitor (3) and a triggering tip (4). When the transistor (2) is triggered to switch on, the capacitor is quickly charged. After a trigger switch An is turned off, the electric potential in two ends of the capacitor doesn't change, and the transistor (2) can keep switching on. A circuit R is connected two ends of the capacitor (3) in parallel to make the capacitor (3) discharge, and the electric potential in the b terminal of the base gradually changes ultimately to switch off the transistor (2) to obtain a delaying effect.

Description

Multi-functional electronic switch

The invention belongs to electronic switch, can be widely used in and trigger various warning circuits.

There are many occasions need be to the object of which movement monitoring, alarming.As commercially available combination lock alarm, when case and bag were mentioned by the people by horizontal positioned, action of gravity made casing inner sensor closure, triggered the ghyristor circuit conducting, and alarm continues to report to the police.

The purpose of this invention is to provide a kind of above-mentioned reverse-blocking tetrode thyristor function that promptly has, have delay function and cost to have only 1/3rd multifunctional electronic switch of reverse-blocking tetrode thyristor again.

The present invention finishes as follows.Electronic switch (1) is made up of triode (2), electric capacity (3) and trigger end (4).Trigger end (4) and external trigger switch A join, when trigger switch A is closed, triode (2) conducting, simultaneously electric capacity by quick charge to supply voltage.After trigger switch A disconnected, electric capacity two terminal potentials were constant, and triode (2) keeps conducting.

Below in conjunction with accompanying drawing invention is described in further detail:

Fig. 1 is principle of the invention figure.Referring to Fig. 1.The collector electrode c of triode (2) and emitter e are serially connected with among the direct current supply line L, and a pair of trigger terminal (4) is arranged on collector electrode c and the base stage b, and A joins with the external trigger switch.Base stage b series capacitance (3) back joins with power line M.When trigger switch A is closed, triode (2) conducting, simultaneously power supply through trigger switch A to capacitor fast charging to supply voltage.After trigger switch A disconnected, electric capacity two terminal potentials were constant, and triode (2) keeps conducting.If the resistance R in parallel at electric capacity (3) two ends, then electric capacity (3) two ends electric charge discharges by resistance R, and base stage b terminal potential gradually changes triode (2) is closed, and reaches the effect of time delayed turn-off.

Triode among Fig. 1 (2) is the NPN type.If electric power polarity is opposite, then should select positive-negative-positive for use, the polarity of electric capacity (3) also should be exchanged.

The embodiment of the invention one is to be used for the combination lock alarm.Its electrical schematic diagram such as Fig. 1.Triode (2) model is 9013, electric capacity (3) capacity 220 microfarads, and the alarm integrated circuit (IC) adopts KD-9561, and resistance R does not connect.Because loudspeaker directly obtain electric current from power supply, actual flow is the microampere order electric current of IC through the electric current of electronic switch (1), and the base current of triode (2) also is that the discharging current of electric capacity (3) is almost nil, and electric capacity two terminal potentials are constant, and alarm continues to report to the police.

The embodiment of the invention two is to insert resistance R on embodiment one basis.When resistance R is 510 kilo-ohms, when capacitance was 220 microfarads, after trigger switch A disconnected, alarm still continued to report to the police about one minute.

Claims

1, multifunctional electronic switch is characterized in that electronic switch (1) is made up of triode (2), electric capacity (3) and trigger end (4).

2,, it is characterized in that in the collector electrode c of triode (2) and the electric power loop that emitter e is serially connected with controlled circuit its base stage b and the other end that connects power supply after electric capacity (3) is connected by the described switch of claim 1.

3, by the described switch of claim 1, it is characterized in that the two ends of trigger end (4) pick out from the collector electrode c and the base stage b of triode (2) respectively.