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Light touch switch type key circuit

A light touch switch and circuit technology, which is applied in the electronic field, can solve the problems of light touch switch buttons such as easy and practical effects, and achieve the effects of improving user satisfaction, saving maintenance costs, and reducing after-sales complaints

Active Publication Date: 2010-01-06
SHENZHEN TCL NEW-TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The object of the present invention is to provide a light touch switch key circuit, aiming to solve the problem that the light touch switch key is easy to be effective in the prior art

Method used

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] attached figure 2 Shows the circuit diagram of the tact switch key circuit provided by the embodiment of the present invention, including resistors R1 and R2, tact switch K1, and electronic switch, wherein the electronic switch is composed of semiconductor transistor Q1, resistor R3 and resistor R4, and the triode The collector of Q1 is connected to the power supply Vcc through two series-connected resistors R1 and R2, the emitter is connected to the circuit ground, the base is connected to a contact of the tact switch K1, and the gap between the base and the emitter is Connected with resi...

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Abstract

The invention is applicable for the technical field of electronics, and provides a light touch switch type key circuit, which comprises a power supply (Vcc), a resistor (R1) and a resistor (R2). The key circuit further comprises an electronic switch and a light touch switch (K1), wherein the light touch switch (K1) is connected with an input end of the electronic switch; after the resistor (R1) and the resistor (R2) are connected in series, one end of the resistor (R1) and one end of the resistor (R2) are connected with the power supply (Vcc), while the other ends are connected with an output end of the electronic switch; the light touch switch (K1) is used for controlling the on-off of the electronic switch through the on-off of the light touch switch (K1); and the electronic switch is used for outputting a control signal. Through the technical scheme in the invention, a light touch switch type key still can be normally used if insulation resistance thereof is decreased much or contact resistance is increased much, so that the working reliability of equipment is greatly improved, the degree of satisfaction of users is improved, after-sales complaints about the failure of the key are greatly reduced, and the maintenance cost is saved.

Description

technical field [0001] The invention belongs to the field of electronic technology, in particular to a light touch switch type key circuit. Background technique [0002] More and more tact switches are used in existing electrical equipment. Tact switches have the advantages of simple circuit and low cost, but there are also some problems in their actual use. Taking televisions as an example, at present, the The part with the most after-sales complaints and repairs of TV sets is the failure of TV buttons. The main cause of failure is the failure of the tact switch used for the button. When the resistance between the two pins is in the off state), the dysfunction caused by the reduction, the continuous effect brought by the normally on state, etc., also has a part of the contact resistance of the light touch switch (defined in the present invention as when the button is pressed and the switch is in the on state The resistance between the two feet) increases the dysfunction, n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/96
Inventor 康伟
Owner SHENZHEN TCL NEW-TECH CO LTD
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