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Overvoltage protection circuit of signal switch

A technology of overvoltage protection circuit and signal switch, applied in the direction of protection that reacts to overvoltage, etc., can solve the problem of false triggering of overvoltage protection, etc., and achieve the effect of reducing capacitance and increasing equivalent impedance

Pending Publication Date: 2022-08-02
SHANGHAI AWINIC TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In this regard, the present application provides an overvoltage protection circuit for a signal switch to solve the problem of false triggering of the overvoltage protection due to the rising slope of the resistance voltage division exceeding the rising slope of the port voltage in the existing related solutions

Method used

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Embodiment Construction

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] First of all, it should be noted that the same combination figure 1 , when the high-voltage port voltage rises, the current flowing through the feed-forward capacitor is ICf=Cf*V / t, and the equivalent impedance is t / Cf, that is, the faster the high-voltage port voltage rises, the larger the feed-forward capacitor, the larger the feed-forward capacitor The smaller the equivalent impedance is, the faster the rising slope of the r...

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Abstract

The invention provides an overvoltage protection circuit for a signal switch, and the circuit is characterized in that a basic overvoltage comparison unit is used for generating an overvoltage comparison signal according to a high-voltage port voltage and a preset reference voltage; the voltage clamping unit is used for clamping the voltage of the low-voltage port according to the voltage of the low-voltage port and a preset clamping threshold value in the voltage clamping unit and generating a clamping control signal; the control unit is used for generating a control voltage to the control end of the signal switch according to the overvoltage comparison signal and the clamping control signal so as to control the on-off of the signal switch, so that the voltage of the low-voltage port can be clamped, and the on-off of the signal switch can be cooperatively controlled through the overvoltage comparison signal and the clamping control signal; and the capacitance value of the feed-forward capacitor in the basic overvoltage comparison unit is smaller than the preset value, so that the capacitance value of the feed-forward capacitor in the basic overvoltage comparison unit is reduced, the equivalent impedance of the feed-forward capacitor is improved, and the rising slope of resistance voltage division is prevented from exceeding the rising slope of port voltage.

Description

technical field [0001] The invention relates to the technical field of semiconductor integrated circuits, in particular to an overvoltage protection circuit of a signal switch. Background technique [0002] like figure 1 As shown in the figure, the overvoltage protection circuit of the existing signal switch mainly divides the voltage on the high-voltage port through the first voltage dividing resistor (R1 in the figure) and the second voltage dividing resistor (R2 in the figure), and uses the comparison The device compares the resistor divider voltage (VDIV in the figure) with the reference voltage (VREF in the figure), and immediately turns off the signal switch (Switch in the figure) if overvoltage occurs. [0003] In the actual circuit, the first voltage dividing resistor has parasitic capacitance (Cp in the figure) to the ground, the rising slope of the voltage dividing port of the output voltage dividing voltage is slower than that of the high voltage port, and the vo...

Claims

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Application Information

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IPC IPC(8): H02H3/20
CPCH02H3/20
Inventor 姜艳
Owner SHANGHAI AWINIC TECH CO LTD
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