CN2490759Y

CN2490759Y - Touch switch capable of avoiding element damaged

Info

Publication number: CN2490759Y
Application number: CN 01229008
Authority: CN
Inventors: 洪当岳
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-06-21
Filing date: 2001-06-21
Publication date: 2002-05-08
Anticipated expiration: 2011-06-21

Abstract

A touch switch capable of avoiding element damaged comprises a control wafer which has at least one power input terminal, an AC signal input terminal connected with the power supply, a signal input and output terminal, a ground terminal; a voltage stabilization and rectification unit which is connected with the power supply; a touch control unit which has at least one contact member connected with the signal input terminal of the wafer; and a bidirectional thyristor which is provided with a gate end connected with the signal input terminal of the wafer, wherein a first end joins up in series an inductance connected with a lamp body, the other end of the lamp body is connected with the power supply, one end of a resistor is connected with the first end of the bidirectional thyristor, and the other end of the resistor is connected with a capacitance in series, is connected with a second end of the bidirectional thyristor, and is also earthed.

Description

Can avoid the soft-touch control of component wear

The utility model is relevant with soft-touch control, more detailed it, be to refer to a kind of soft-touch control of avoiding component wear.

Press, shown in Figure 1, be in the existing touch switch circuit 70.For using bidirectional triode thyristor 71 to be used as the local circuit structure of switch, by finding out among Fig. 1, the lock end 72 of this bidirectional triode thyristor 71 is connected in extraneous signal end, control its open circuit, path in order to receive outer signals, the two ends of this bidirectional triode thyristor 71 are connected to a light fixture 75 and a ground connection.

Aforesaidly commonly use touch switch circuit structure 70 in use, when bidirectional triode thyristor 71 is become off-state by transition, can cause very high (dv/di) c, if this value is higher than rated value and can forces bidirectional triode thyristor 71 to return conducting state (being that bidirectional triode thyristor is punched), do not have time enough to remove because bidirectional triode thyristor 71 connects the electric charge electronics of face, therefore caused the damage of bidirectional triode thyristor 71;

When supply voltage is lower than load voltage, can cause back electromotive force again,, the electric current of bidirectional triode thyristor 71 of flowing through can reduce to zero suddenly, cause bidirectional triode thyristor 71 commutation failures, can produce very high (di/dt) this moment, causes the damage of bidirectional triode thyristor 71 and light fixture 75 easily.

Main purpose of the present utility model is promptly providing a kind of soft-touch control of avoiding component wear, and it can protect bidirectional triode thyristor not fragile.

Of the present utility model time a purpose is that a kind of soft-touch control of avoiding component wear is being provided, and it can protect the lamp body that is connected not fragile.

Edge is, according to a kind of soft-touch control of avoiding component wear provided by the utility model, include: a control wafer, at least have a power input, an AC signal input, a signal input part, an earth terminal and a signal output part, this AC signal input is to be connected in AC power; One voltage stabilizing rectification unit is connected in AC power; One touch control unit has a contact at least, is connected in the signal input part of this control wafer; One two-way controllable silicon, its lock end is connected in the signal output part of this control wafer, and first end is connected in series an inductance and is connected in a lamp body, and this first end also is connected in series a resistance and an electricity visitor and be connected in second end of this bidirectional triode thyristor, this second end ground connection.

Wherein the model of this control wafer is TT8486BA.

Relevant detailed structure of the present utility model, feature and effect, below in conjunction with a preferred embodiment, and conjunction with figs. is further described, wherein:

Fig. 1 is the circuit structure diagram of existing soft-touch control;

Fig. 2 is the circuit structure diagram of the utility model one preferred embodiment.

See also Fig. 2, a kind of touch switch circuit 10 of avoiding component wear that the utility model one preferred embodiment is provided mainly is made up of a control wafer 11, a voltage stabilizing rectification unit 21, a touch control unit 31 and a two-way controllable silicon 41, wherein:

This control wafer 11, its model is TT8486BA, has a power input 12, an AC signal input 13, a signal input part 14, an earth terminal 15 and a signal output part 16; This power input 12 is connected in predetermined VCC (5V direct current) power supply; This AC signal input 13 is connected in series a resistance R 6 and is connected in AC power 19;

This voltage stabilizing rectification unit 21 is made up of a diode D1, a Zener diode ZD and an electric capacity EC1, is connected in this AC power 19, in order to transfer AC power 19 to the galvanic current source;

This touch control unit 31, has a contact 32 for the staff contact, this contact 32 is serial connection some capacitor C 2, C3, C4 and be connected in this signal input part 14, wherein these capacitor C 2, C3, C4 are be used to provide higher degree withstand voltage, with prevent human body with electrostatic potential too high and puncture this control wafer 11, in addition, 31 of this signal input part 14 and this touch control units more are provided with one group of catching diode D2, D3, can be effectively with voltage limit in fixing size, so that the effect of protection to be provided;

This bidirectional triode thyristor 41, its lock end 42 serial connection one capacitor C 1 and a resistance R 7 and be connected in the signal output part 16 of this control wafer 11, first end 44 serial connection one inductance L 1 of this bidirectional triode thyristor 41 and be connected in an end of a lamp body 50, the other end of this lamp body 50 is connected in AC power 19, and first end 44 of this bidirectional triode thyristor 41 also is connected in series a resistance R 9 and a capacitor C 5 and is connected in second end 46 of this bidirectional triode thyristor 41, this second end 46 and ground connection.

Aforesaid circuit structure in use, the user sees through to touch the action that this contact 32 causes switch lamp body 50 with hand, in the process of operation, when lamp body 50 is not lighted.And when staff touches this contact 32, the signal input part 14 of this control wafer 11 promptly receives the higher voltage signal, this moment, this control wafer 11 was promptly sent the lock end of signal to this bidirectional triode thyristor 41 through this signal output part 16, and then this bidirectional triode thyristor 41 conductings, this lamp body 50 are promptly switched on and luminous; When staff touches this contact 32 once more, promptly there is signal to input to this control wafer 11 again, this control wafer 11 is promptly sent signal once more to end between this bidirectional triode thyristor 41, and then this bidirectional triode thyristor 41 is opened circuit;

Advantage of the present utility model is: in these bidirectional triode thyristor 41 conductings, the process that opens circuit, the inductance that utilizes the utility model to connect, can effectively improve the problem of back electromotive force, reduce the value of (di/dt), can not damage to protect this bidirectional triode thyristor 41 and this lamp body 50; In addition, see through capacitor C 5 and resistance R 9 that the utility model connected, can effectively reduce (dv/di) c value of this bidirectional triode thyristor 41 when becoming off-state, be not destroyed to protect this bidirectional triode thyristor 41 by transition.

Claims

1. the soft-touch control that can avoid component wear is characterized in that, includes:

One control wafer has a power input, an AC signal input, a signal input part, an earth terminal and a signal output part at least, and this AC signal input is to be connected in AC power;

One voltage stabilizing rectification unit is connected in AC power;

One touch control unit has a contact at least, is connected in the signal input part of this control wafer;

One two-way controllable silicon, its lock end is connected in the signal output part of this control wafer, and first end of this bidirectional triode thyristor is connected in an end of an inductance, the other end of this inductance then is connected in a lamp body, the other end of this lamp body is to be connected in this AC power, one resistance is connected in first end of this bidirectional triode thyristor with the one end, and the other end of this resistance is connected in series an electric capacity and is connected in second end of this bidirectional triode thyristor, the second end ground connection of this bidirectional triode thyristor.

2. the soft-touch control of avoiding component wear according to claim 1 is characterized in that, wherein the model of this control wafer is TT8486BA.