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Touch lamp switch what principle?

My table lamps, touch switches, do not know what principle, is it possible to draw circuit diagrams

Posted on 2013-02-15 03:06:12

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Speed Touch mode touch light switch model presented here with only a touch light switch pads, you can complete the turn on the lights and turn off the lights. With touch as light switches, the use of phase two-wire into the switch, you can directly replace ordinary switch without having to change the original wiring room. Works touch switch circuit as shown in the dotted line right of the figure for the general power supply wiring, left the Ministry of touch light switch lines. A main circuit switch routing VDl VS VD4 and composition, composed of manifold A switch control circuit o R51VD5 and C3 form a simple resistance buck regulator circuit, the output of about 12V DC power supply control loop, etc.. Instructions for the low-light LED for night indicating the location of the touch switch for easy use. If instructions do not need low light, with a wire to the positive and negative LED pins can be shorted solder joints. IC A Yes - Dual D flip-flop block, respectively, then as a one-shot circuit and a bistable circuit. The role of the monostable circuit is a pulse width of the touch signal shaping to ensure that each touches are reliable. VS bistable thyristor circuit to drive the opening or close. M is the touch pads, touch finger M, the body leakage of AC voltage drop across the resistor R2, the positive half cycle signal into the A 3-foot one-shot circuit that CP side to make the turn into the occasional one-shot circuit state and its output Q is 1 foot from the low into a high jump, the high Cl by the R3 to charge, so that the R-side potential of 4 foot rise, when up to reset the level, the single stable state circuit reset, a low foot recovery. So every time the touch electrodes M, 1 pin to output a fixed-width positive pulse. This positive pulse will be directly added to the 11 feet that bistable circuit CP side to make a bistable flip the circuit, its output level Q that is 13 feet to change again. When the 13 pin is high, VS R4 get through the gate trigger current and forward the opening of the electronic switch is closed, lamp light shine. At this time the voltage across the capacitor C3 will drop to around 3V, LED LED goes out, but A still work properly. When the 13 pin output low, VS lost trigger current, when the AC zero crossing is shut off, lights go out. At this time the voltage across C3 can return to 12V, LED light for low light instructions. Thus, each time touching the electrodes M, can achieve the "on" or "off" lights in action. A selection and production of components with the CD4013 dual D flip-flop digital integrated circuits, which uses 14-pin dual in-line plastic package oVS with MCRl00-8 2N6565-type and other small plastic one-way thyristor. VD1-4 with a 1N4004- 1N4007 silicon rectifier diode type, etc., VD5 with 12V, 1/2W Zener diode, such as 2CW60 type. Red light-emitting diode LED is available. R5 preferably RJ-1W metal film resistors, and the remaining resistors are carbon film resistors with RTX-l/8W. C1 C2 CT4-type monolithic capacitors are available, C3 with CDll-16V electrolytic capacitors. Switch housing production by 86 series switch panel, to ensure the absolute safety of the user may contact mode between the electrodes and the resistors R1 and then a 2M high impedance resistor connected in series access this switch lighting circuit, connected in the same ordinary switch , according to the phase diagram into the switch, such as the relative position of the zero line reversed, the circuit does not work. After loading the circuit without debugging, after power can work. Mode bit M, lights; touching their - under the lamp. The principle touch mode lamp light touch is what it does not common in internal small SCR bad, very cheap, either for the same model only.

2013-02-15 03:06:12