Multifunctional capacitive contact switch

Abstract

The invention discloses a multifunctional capacitive touch switch, which comprises a shell and a capacitive screen, wherein the capacitive screen is arranged on the shell; a circuit board comprises a current detection circuit, a thyristor, a control module, a zero cross detection circuit, an on-off key and a positive and negative dimmer key; the on-off key is connected with the control circuit; a zero line connection terminal and an LED fire line connection terminal are connected with a thyristor staring current circuit and a dynamic current maintaining circuit in parallel; a thyristor control circuit is arranged between the thyristor and the control module; the thyristor control circuit is used for providing trigger pulse current to the thyristor; and an optocoupler transfer control circuit is arranged between the dynamic current maintaining circuit and the control module. According to the multifunctional capacitive touch switch, the flicker phenomenon that the thyristor is unexpectedly closed due to the fact that an LED lamp is relatively low in power and discontinuous in current is avoided; the condition that current which flows through the control module flows through the LED lamp is avoided; and the phenomenon that the originally controlled LED lamp flickers or cannot be turned off is also avoided.

Description

technical field [0001] The invention relates to the technical field of power switches, in particular to a multifunctional capacitive touch switch. Background technique [0002] The existing capacitive touch switch can only control the on and off of the LED light, only considering the lighting, the brightness of the LED light cannot be adjusted through the switch, which cannot meet the needs of more people; for example, it cannot be adjusted according to the season, illuminance On the one hand, LED lamps cannot be well adapted to traditional thyristor dimmers, because LED lamps have a built-in switching power supply and are driven by this switching power supply, and the current of the switching power supply when it is working Usually discontinuous, that is, there will be hundreds to thousands of current discontinuities in one cycle of alternating current. Even if the current is continuous, the current at the bottom of the current is often not enough to maintain the normal con...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a multifunctional capacitive touch switch, which solves the situation that the thyristor is accidentally opened due to excessive reverse electromotive force when the current is switched, and avoids the failure of the control module. The current will flow through the LED lamps, which solves the phenomenon that the originally controlled LED lamps flicker or cannot be turned off

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