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Key protection circuit and realization method thereof

A technology for protecting circuits and buttons, which is applied in the field of button protection circuits and its realization, can solve problems affecting user convenience and system instability, and achieve the effect of improving convenience and system stability

Active Publication Date: 2012-06-13
SHENZHEN TCL NEW-TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will not only affect the convenience of user operation, but also make the system more unstable

Method used

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  • Key protection circuit and realization method thereof
  • Key protection circuit and realization method thereof
  • Key protection circuit and realization method thereof

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Embodiment Construction

[0030] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0031] refer to figure 1 , figure 1 It is a schematic diagram of the principle of the first embodiment of the key protection circuit of the present invention.

[0032] In this embodiment, a key protection circuit provided can be applied to various household appliances using touch key systems such as televisions and refrigerators. The key protection circuit includes a control chip 10 and an inductive sensor 20. The input terminal of the control chip 10 is connected to the inductive sensor 20. When the human body approaches or touches the inductive sensor 20, a control signal will be generated. At this time, the control chip 10 The input terminal can be used to receive the control signal; the output terminal of the control chip 10 is connected with the key identification circuit in the touch key system, and the effect...

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Abstract

The invention discloses a key protection circuit comprising a control chip and an inductive sensor. The inductive sensor is connected with an input terminal of the control chip; and an output terminal of the control chip is connected with a key identification circuit in a touch key system. Besides, the key protection circuit also comprises a first differential line and a second differential line, wherein the two differential lines are arranged between the inductive sensor and the input terminal of the control chip; the first differential line and the earth form a first induction capacitor; and one end of the second differential line and the earth form a second induction capacitor, wherein the one end of the second differential line approaches the inductive sensor. And according to a difference value between the first induction capacitor and the second induction capacitor, it is determined whether the output terminal of the control chip is used to output a signal to the key identification circuit in the touch key system. In addition, a realization method of the key protection circuit is provided in the invention. According to the provided key protection circuit in the invention, it can be realized that no dysfunction phenomenon occurs at a touch key when the touch key is interfered by an external electromagnetic wave or the ground level is fluctuated, thereby substantially improving convenience of user operation; and meanwhile, the system can be stable.

Description

technical field [0001] The invention relates to the technical field of circuit protection, in particular to a key protection circuit and an implementation method thereof. Background technique [0002] In the current household electrical appliances, buttons are used to adjust the functions of the products, and these household appliances generally use buttons or metal domes as switches, and the power switch and function selection are realized by pressing the buttons with fingers. However, when this key switch is in use, the pressure on the button when the finger presses the button will affect its sensitivity, and the click sound produced when the button is pressed will also bring unnecessary noise to consumers, affecting consumption. Audience's auditory experience, but also affect the overall appearance of electrical products. [0003] With the continuous development of science and technology, the level of living consumption and the gradual improvement of appreciation taste, ...

Claims

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Application Information

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IPC IPC(8): H03K17/96
Inventor 黄晓明
Owner SHENZHEN TCL NEW-TECH CO LTD
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