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Circuit protection system

A technology for circuit protection and electrostatic protection, which is applied in the direction of circuit devices, emergency protection circuit devices, electrical components, etc., and can solve problems such as the inability to protect integrated circuits 101 and integrated circuits 101 from electrostatic damage

Inactive Publication Date: 2013-06-05
QISDA OPTRONICS (SUZHOU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, when there is static electricity input to the input terminal P IN At this time, the damaged electrostatic protection element 100 cannot protect the integrated circuit 101, so that the integrated circuit 101 is damaged by static electricity

Method used

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Embodiment Construction

[0022] Please refer to figure 2 , the first embodiment of the present invention, the circuit protection system 200 includes an electrostatic protection element 210 and a leakage current protection circuit 220 . The ESD protection element 210 is used to prevent the integrated circuit 201 from being damaged by ESD. The ESD protection element 210 is coupled to the input terminal P of the integrated circuit 201 IN . input terminal P IN to be used from the signal source S IN Receive input signal. ESD protection element 210 includes Zener diode ZD 1 with ZD 2 , which works as figure 1 As described in the description, it will not be repeated. It should be understood that in addition to the ESD protection component of the present invention, there may still be other ESD protection components applicable to the present invention. Leakage current protection circuit 220 includes filter capacitor C F1 , and the current limiting resistor R L1 . filter capacitor C F1 Coupled to ...

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Abstract

The invention relates to a circuit protection system comprising a static protection element and a leakage current protection circuit, wherein the static protection element is perforatively coupled with the input end of an integrated circuit, and the input end of the integrated circuit is used for receiving an input signal from a signal source; the leakage current protection circuit is provided with a filter capacitor coupled with the static protection element; and when the input signal has leakage currents and the leakage currents contain AC components, the filter capacitor has high impedanceso as to prevent the leakage currents generated due to an AC power supply from entering the static protection element.

Description

technical field [0001] The present invention relates to a circuit protection system, in particular to a circuit protection system which can avoid being damaged by the leakage current generated by the AC power supply. Background technique [0002] Please refer to figure 1 . figure 1 Schematic diagram of a prior art ESD protection component. The ESD protection element 100 is used to prevent an integrated circuit (integrated circuit, IC) 101 from being damaged by ESD. The ESD protection element 100 is coupled to the input terminal P of the integrated circuit 101 IN . input terminal P IN to be used from the signal source S IN Receive input signal. The electrostatic protection element 100 includes a Zener diode (Zener diode) ZD 1 with ZD 2 . Zener diode ZD 1 The first terminal of is coupled to the input terminal P IN . Zener diode ZD 1 The second terminal is coupled to the Zener diode ZD 2 the second end of . Zener diode ZD 2 The first terminal of is coupled to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02
Inventor 吴宗训张为钧宋建纬
Owner QISDA OPTRONICS (SUZHOU) CO LTD
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