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Resistive touch screen protecting circuit

A technology of resistive touch screen and protection circuit, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc. , to prevent ESD overvoltage phenomenon, eliminate high transient voltage, and achieve the effect of simple structure

Inactive Publication Date: 2017-07-28
PIXY SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no special protection circuit, and it is impossible to effectively protect against overvoltage phenomena such as ESD.

Method used

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  • Resistive touch screen protecting circuit

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Experimental program
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Effect test

Embodiment

[0019] Such as figure 1 As shown, a resistive touch screen protection circuit is arranged on the drive line between the resistive touch screen control board and the resistive touch screen to prevent instantaneous high voltage on the resistive touch screen drive line. The protection circuit includes a transient voltage suppression diode D1, The first resistor R1, the second resistor R2 and the capacitor C1, the signal output terminal of the resistive touch screen control board, the second resistor R2, the first resistor R1 and the signal input terminal of the resistive touch screen are connected in sequence, and the positive pole of the transient voltage suppression diode D1 is grounded, and the negative pole is grounded. Connected between the first resistor R1 and the second resistor R2, one end of the capacitor C1 is grounded, and the other end is connected between the first resistor R1 and the signal input end of the resistive touch screen.

[0020] The value range of the fi...

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Abstract

The invention relates to a resistive touch screen protecting circuit which is arranged on a driving line between a resistive touch screen control board and a resistive touch screen and is used for preventing instantaneous high voltage on a resistive screen driving line. The protecting circuit comprises a transient voltage inhibition diode, a first resistor and a capacitor. The signal output end of the resistive touch screen control board, the first resistor and the resistive touch screen signal input end are successively connected. The anode of the transient voltage inhibition diode is grounded, and the cathode is connected between the first resistor and the signal output end of the resistive touch screen control board. One end of the capacitor is grounded, and the other end is connected between the first resistor and the signal input end of the resistive touch screen. Compared with prior art, the resistive touch screen protecting circuit has advantages of high integration degree, small size, high convenience and high flexibility in use, effective ESD overvoltage protection, etc.

Description

technical field [0001] The invention relates to a protection circuit, in particular to a resistance touch screen protection circuit. Background technique [0002] Vehicle-mounted display devices are generally used in relatively complex electromagnetic environments such as locomotives. Instantaneous high voltages often appear on the touch-screen drive lines of vehicle-mounted display devices, which will cause abnormal operation of the touch screen and damage the touch screen in severe cases. At present, there are only ordinary filter capacitors on the common drive circuit to filter out high-frequency interference. However, without a special protection circuit, it is impossible to effectively protect against overvoltage phenomena such as ESD. Contents of the invention [0003] The object of the present invention is to provide a resistive touch screen protection circuit in order to overcome the above-mentioned defects in the prior art. [0004] The purpose of the present in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04G06F3/045
CPCH02H9/04G06F3/045
Inventor 武利伟余吉陈权孙涵彦
Owner PIXY SHANGHAI CO LTD
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