CN2059028U

CN2059028U - Protector for tv set

Info

Publication number: CN2059028U
Application number: CN 89207775
Authority: CN
Inventors: 陈琳; 陈义
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-06-01
Filing date: 1989-06-01
Publication date: 1990-07-04

Abstract

The utility model discloses a protector for the TV set. The appearance of the protector for the TV set is similar with the ordinary circuit board, the appearance of the protector for the TV set has an automatic turning off function after the power failure and an over-voltage protection function, and the protector for the TV set is also provided with a pair of touch switches and an indicating lamp which can indicate when the power is supplied. The protector for the TV set has the advantages of simple structure, convenient operation, high reliability and low cost.

Description

Protector for TV set

The utility model relates to the protective device of household electrical appliance, is specifically related to a kind of television protector.

In television set rating process, if plug is loosening or grid cut-off power supply again at once, may produce the prejudicial impulse current of television set, at this moment the user hastens to feel about in the dark to turn off television set usually.

Can cut off the electricity supply automatically when the purpose of this utility model is to design a kind of the outage, simple in structure, easy to use, dependable performance, television protector that cost is low.

The utility model is made of jointly shell 2, bridge rectifier 1, unidirectional controllable silicon S CR, resistance R 1, electrochemical capacitor C1, voltage stabilizing didoe D1, resistance R 5, triode BG1, electrochemical capacitor C3, power line E, F and output O, P.An one end E of power line and an end O of output respectively with bridge rectifier 1 exchange end H, G links, the other end F of power line and the other end P of output link, two dc terminal D of unidirectional controllable silicon S CR and bridge rectifier 1, the I parallel connection, electrochemical capacitor C1 and voltage stabilizing didoe D1 parallel connection again with the two ends that are connected in controllable silicon SCR after resistance R 1 is connected, the collector electrode of triode BG1 and resistance R 1, the interface C of capacitor C 1 links, one end of its base stage and resistance R 5 links, the positive pole of its emitter and capacitor C 3 links with the control utmost point of unidirectional controllable silicon S CR together, and the negative pole of the negative pole of capacitor C 3 and unidirectional controllable silicon S CR links.During use, power line and civil power link, and television set and output link.During startup, power supply forms the loop through television set, bridge rectifier 1, resistance R 1, capacitor C 1 and voltage stabilizing didoe D1, makes capacitor C 1 two ends have a galvanic current to press Vc1.When hand touches the B point of triode BG1 base resistance R5, transistor base produces induced current Ib, make triode BG1 conducting, triode BG1 collector electrode has an electric current I c to emitter, thereby triggered unidirectional controllable silicon S CR, make its conducting, and keep conducting when making unidirectional controllable silicon S CR zero passage by capacitor C 3, like this, power supply, television set, bridge rectifier, one-way SCR form a loop, and television set is exchanging end, and one-way SCR is in dc terminal, television set and power supply form the loop, and television set can operate as normal.At this moment, the voltage Vc1 on the capacitor C 1 is through resistance R 1 and unidirectional controllable silicon S CR discharge.During power cut-off, one-way SCR automatically shuts down, when sending a telegram here again, because triode BG1 base stage does not have trigger current, and not conducting, so unidirectional controllable silicon S CR is an off state, television set and power supply can not form the loop.Thereby can avoid the infringement of any impulse current of power end to television set, the user needn't go to have turned off television set in the dark.

The utlity model has simple in structure, easy to use, dependable performance, low cost and other advantages.

The utility model has following accompanying drawing:

Fig. 1 television protector principle schematic

Fig. 2 television protector profile schematic diagram

Fig. 3 television protector printed panel schematic diagram

Below in conjunction with accompanying drawing the utility model is elaborated.

Fig. 1 is the utility model principle schematic, and its basic comprising is bridge rectifier 1 and unidirectional controllable silicon S CR, and load (television set) is connected on the interchange end of bridge rectifier, and unidirectional controllable silicon S CR is connected on the dc terminal of bridge rectifier.Resistance R 1, electrochemical capacitor C1, voltage stabilizing didoe D1 and triode BG1 have constituted the trigger of unidirectional controllable silicon S CR, and capacitor C 3 makes unidirectional controllable silicon S CR keep conducting when the power supply zero passage.The selection of trigger element wants bonding to triggering, the conducting reliably of controllable silicon SCR energy quilt.Resistance R 5 can be selected mega-ohms for use, to guarantee the safe in utilization of soft-touch control.

As another embodiment, its feature also is the end F that power line and output directly link, P is a live wire, diode D6 and resistance R 2, be connected between the negative pole of live wire F and unidirectional controllable silicon S CR after the R3 series connection, the control utmost point of the collector electrode of triode BG2 and unidirectional controllable silicon S CR links, the negative pole of its emitter and unidirectional controllable silicon S CR links, the positive pole of its base stage and capacitor C 2, the positive pole of voltage stabilizing didoe D7 links, the negative pole of the negative pole of capacitor C 2 and unidirectional controllable silicon S CR links, the negative pole of voltage stabilizing didoe D7 and resistance R 2, the interface of R3 links.The combination of above unit, device makes to the utlity model has over-voltage protecting function.When supply voltage surpassed design load (present embodiment is 245 volts), triode BG3 conducting made triode BG2 saturated, and capacitor C 3 is by bypass, thereby unidirectional controllable silicon S CR is automatically shut down when the power supply zero passage.This function can protect condenser unit to avoid damage, turn-off time t≤0.01 second when the power supply overvoltage effectively.

Another embodiment of the present utility model, its both positive and negative polarity that is further characterized in that voltage stabilizing didoe D7 link with emitter, the collector electrode of triode BG3 respectively, are connected with resistance R 4 on the base stage of triode BG3.The function of above element is: when hand touches the other end A of resistance R 4, make triode BG3 conducting, and triode BG2 conducting thereupon, capacitor C 3 is by bypass, thereby unidirectional controllable silicon S CR is automatically shut down when zero passage.As seen, the A point of the B point of triode BG1 base resistance R5 and triode BG3 base resistance R4 is actually one group of contact witch, and the effect of resistance R 4 is to ensure safety.Contact witch is better than the antijamming capability of inductive switch.

Shell of the present utility model can adopt the terminal block 2 of existing bigeminy at least, and whole components and parts of protector are installed in terminal block inside.Fig. 2 has provided a kind of embodiment, and it has one group of berrette file socket and one group of flat, shared socket of circle, so just goes for the condenser unit of three kinds of different plugs.Have the window of indicator light D8 on the terminal block 2, indicator light D8 can adopt devices such as light-emitting diode, neon tube, and the end of indicator light D8 and the positive pole of unidirectional controllable silicon S CR link, and the other end links by the negative pole of resistance R 6 with unidirectional controllable silicon S CR.When sending a telegram here after the outage, indicator light D8 is bright again, and television set is connected rear indicator light D8 and extinguished automatically.

The utility model both can become a device and condenser unit to be used separately, also can be installed in condenser unit inside, was integrated with the condenser unit movement.

Fig. 3 is the utility model printed panel schematic diagram, as we can see from the figure the relative space relation between each components and parts of the utility model.

Claims

1; a kind of television protector; of the present utility modelly be characterised in that it is by shell 2; bridge rectifier 1; unidirectional controllable silicon S CR; resistance R 1; electrochemical capacitor C1; voltage stabilizing didoe D1; resistance R 5; triode BG1; electrochemical capacitor C3; power line E; F and output O; the common composition of P; an one end E of power line and an end O of output respectively with bridge rectifier 1 exchange end H; G links; the other end F of power line and the other end P of output link; two dc terminal D of unidirectional controllable silicon S CR and bridge rectifier 1; I is in parallel; electrochemical capacitor C1 is in parallel with voltage stabilizing didoe D1; with the two ends that are connected in controllable silicon SCR after resistance R 1 is connected; the collector electrode of triode BG1 and resistance R 1; the interface C of capacitor C 1 links; the positive pole of its emitter and capacitor C 3 links with the control utmost point of unidirectional controllable silicon S CR together; one end of its base stage and resistance R 5 links, and the negative pole of the negative pole of capacitor C 3 and unidirectional controllable silicon S CR links.

2; television protector as claimed in claim 1; it is characterized in that the end F that power line and output directly link; P is a live wire; diode D6 and resistance R 2; be connected in after the R3 series connection between live wire F and the unidirectional negative pole that meets silicon SCR; the control utmost point of the collector electrode of triode BG2 and unidirectional controllable silicon S CR links; the negative pole of its emitter and unidirectional controllable silicon S CR links; the positive pole of its base stage and capacitor C 2; the positive pole of voltage stabilizing didoe D7 links; the negative pole of the negative pole of capacitor C 2 and unidirectional controllable silicon S CR links, the negative pole of voltage stabilizing didoe D7 and resistance R 2; the interface of R3 links.

3, television protector as claimed in claim 2, the both positive and negative polarity that it is characterized in that voltage stabilizing didoe D7 link with emitter, the collector electrode of triode BG3 respectively, are connected with resistance R 4 on the base stage of triode BG3.

4, as claim 1 or claim 2 or the described television protector of claim 3; it is characterized in that shell 2 is the terminal block of bigeminy at least; whole units of protector, device are installed in terminal block inside; have the window of indicator light D8 on the terminal block; the end of indicator light D8 and the positive pole of unidirectional controllable silicon S CR link, and the other end links by the negative pole of resistance R 6 with unidirectional controllable silicon S CR.