CN2137051Y

CN2137051Y - Light-operated delay-action electronic switch

Info

Publication number: CN2137051Y
Application number: CN 92242166
Authority: CN
Inventors: 郭云东
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-11-30
Filing date: 1992-11-30
Publication date: 1993-06-23
Anticipated expiration: 2002-11-30

Abstract

The utility model relates to a light-operated delay-action electronic switch, comprising a light control triggering circuit, a controlled silicon monostable triggering circuit and a controlled silicon. The trigger signal of the light control triggering circuit triggers the controlled silicon monostable triggering circuit. The controlled silicon monostable triggering circuit is used to control the on-off state of the controlled silicon. The controlled silicon monostable triggering circuit adopts a circuit construction which is composed of two transistors connected in series and a circuit construction which is composed of field effect transistors. The utility model has the functions of quenching and gradual quenching. The circuit is simple, and the installation and use is convenient.

Description

Light-operated delay-action electronic switch

The utility model relates to electronic switch, the particularly a kind of light-operated time-delay quencher and the electronic switch that gradually goes out.

Existing various switches, mechanical switch will be because the wearing and tearing of mechanical contact will cause the damage of switch at last, electronic switch improves greatly owing to no mechanical wear-out life, reliability strengthens, but general electronic switch function singleness, can not satisfy demand widely, occurred also that some are light-operated, the acoustic control electronic switch, make these switches can satisfy various application scenario, but they or circuit complexity, cost height, perhaps remain closed behind the switch connection always, be not suitable for the occasion that those do not need long-term illumination, as entrance hall, corridor etc.

The purpose of this utility model just provides a kind of light-operated delay electronic switch, and its circuit is simple, understands automatic disconnection after connection a period of time, has overcome the above-mentioned deficiency of existing switch.After main lighting apparatus extinguished, the lighting apparatus (for example wall lamp) of the utility model control was lighted automatically, extinguishes after the break time of delaying time.

Compared with the prior art the utility model has circuit advantage simple, with low cost, special because it is connected in series use with power consumption equipment, and it is convenient especially to install and use.

Below referring to accompanying drawing in detail the utility model is described in detail.

Fig. 1 is the electrical schematic diagram of the light-operated time-delay quencher switch of the utility model one embodiment;

Fig. 2 is gradually the go out electrical schematic diagram of switch of the light-operated time-delay of another embodiment of the utility model.

Earlier referring to Fig. 1,220 volts, 50Hz alternating current one the tunnel form main circuit through controllable silicon SCR after diode D1～D4 rectification, by big electric current bulb L is lighted, another road produces 7.2～8.2 volts of direct currents and gives by triode BG3, BG4, photo resistance M through resistance R 1 after diode D5, D6 and the capacitor C 1 rectifying and voltage-stabilizing filtering _GWith the light-operated circuits for triggering of formation such as capacitor C 4 and the controllable silicon single-shot trigger trigger power supply that constitutes by triode BG1, BG2 etc.

When extraneous light is strong, photo resistance M _GBe low resistive state (about 2K Ω), a point current potential is near supply voltage, and b point current potential is higher, triode BG4 saturation conduction, and triode BG3 ends, capacitor C 2 no-voltages, the output of controllable silicon single-shot trigger trigger Triggerless, controllable silicon SCR is ended, and bulb L does not work.

When the unexpected deepening of light, photo resistance M _GMoment becomes high-impedance state (a few approximately megohm) from low resistive state, the moment reduction of a point current potential, because 4 liang of terminal potentials of capacitor C can not suddenly change, b point current potential also with the moment reduction of a point, ends BG4, and the BG3 conducting, capacitor C 2 is recharged.When the voltage of C2 reaches monostable trigger-action circuit upset level, the BG1 collector electrode produces triggering signal, the controllable silicon SCR conducting, bulb L lights, along with the discharge of capacitor C 2, monostable trigger-action circuit restPoses after the voltage of capacitor C 2 is lower than the monostable trigger-action circuit triggering level, Triggerless output, controllable silicon SCR is ended, and bulb extinguishes automatically, because controllable silicon ends suddenly, so bulb extinguishes suddenly.Time-delay length is controlled by capacitor C 2 discharge times.

Referring again to Fig. 2, circuit structure and Fig. 1 are basic identical, and different with Fig. 1 is that thyristor gating circuit is made of the cmos fet pipe.BG3 ' conducting when capacitor C 4 chargings reach the conducting voltage of field effect transistor BG3 ' produces start pulse signal and makes the controllable silicon SCR conducting on resistance R 3.Because the field effect transistor input resistance is very high, grid current is very little, therefore the C4 discharge is very slow, BG3 ' is in the saturation conduction state, BG3 ' withdraws from saturation condition after 4～5 minutes, carries out the transition to magnifying state, and the trigger impulse phase place lags behind thereupon, therefore thyristor operating angle is reduced, and at this moment bulb is deepening gradually.BG3 ' ends when C4 voltage is lower than BG3 ' conducting voltage, and trigger impulse disappears, and controllable silicon SCR is ended, and bulb extinguishes fully.

Claims

1, a kind of light-operated delay electronic switch is characterized in that mainly comprising light-operated circuits for triggering and controllable silicon single-shot trigger trigger and controllable silicon, and light-operated circuits for triggering are mainly by triode BG3, BG4, photo resistance M _GForm with capacitor C 4, BG3 and BG4 cascade, the BG4 base stage connects an end of capacitor C 4, the other end connecting resistance M of C4 _G, M _GAnother termination positive source, the controllable silicon single-shot trigger trigger mainly is made up of the triode BG1 and the BG2 of serial connection, the base stage of BG2 is connected to the emitter of BG3 through a resistance, silicon controlled is controlled the collector electrode that the utmost point meets BG1.

2, a kind of light-operated delay switch is characterized in that mainly comprising light-operated circuits for triggering and controllable silicon single-shot trigger trigger and controllable silicon, and light-operated circuits for triggering are mainly by triode BG1, BG2, photo resistance M _GForm with capacitor C 3, BG1 and BG2 cascade, the BG2 base stage connects an end of capacitor C 3, the other end connecting resistance M of C3 _G, M _GAnother termination positive source, the controllable silicon single-shot trigger trigger mainly is made up of field-effect transistor BG3 ', the grid level of BG3 ' connects the emitter of BG1 through a resistance, the silicon controlled control utmost point connects the source electrode of BG3.