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overvoltage protection circuit

An overvoltage protection circuit and circuit technology, applied in emergency protection circuit devices, protection reacting to overvoltage, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve problems such as level surges

Active Publication Date: 2018-08-28
SICHUAN YICHONG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] When the USB interface is inserted, the exposed transmission line interface is likely to introduce high-voltage pulses that the chip cannot withstand, or even level surges

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Embodiment Construction

[0044] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0045] The invention provides an overvoltage protection circuit, which realizes rapid response and shutdown to input level signals higher than the safe voltage, and the overvoltage programming process realizes a wide protection range that can be configured for different systems.

[0046] figure 1 A schematic structural diagram of an overvoltage protection circuit provided by an embodiment of the present invention. Such as figure 1 As shown, the overvoltage protection circuit includes a voltage divider module 101, a signal switching module 102, a comparison module 103, a gating module 104, a first control module 105, a second control module 106, a first delay module 107 and a second delay module 108 .

[0047] The voltage dividing module 101 includes N voltage dividing units for dividing the signal to be detected, th...

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Abstract

The invention relates to an overvoltage protection circuit which comprises a voltage division module, a signal switching module and a comparison module. The voltage division module comprises N voltage division units for dividing the voltage of a signal to be detected. The output value of each voltage division unit comprises a target overvoltage detection voltage, a first hysteresis voltage and a second hysteresis voltage. The voltage division module obtains the target overvoltage detection voltage from N target overvoltage detection voltages and outputs the target overvoltage detection voltage, wherein N is a positive integer. The signal switching module is used for selecting the target overvoltage detection voltage or the first hysteresis voltage and outputting to the comparison module according to a feedback signal output by the comparison module. The comparison module is used for comparing the output voltage of the signal switching module with a reference voltage, and outputting the feedback signal and an overvoltage protection signal. The overvoltage protection circuit is used for carrying out safety monitoring protection on level signals exceeding a safety threshold value, meanwhile achieving rapid response for the input level of the protection threshold value and stopping a chip to protect system environment safety.

Description

technical field [0001] The invention relates to the field of high-speed circuits, in particular to an overvoltage protection circuit. Background technique [0002] In the charger equipment applied to OTG loads, a load switch circuit with bidirectional conduction function is required, which can not only satisfy the power supply to charge the host device, but also enable the host device to charge the OTG load when connected to the OTG load; [0003] When the USB interface is inserted, the exposed transmission line interface is likely to introduce high-voltage pulses that the chip cannot withstand, or even level surges. In this case, it is necessary to perform overvoltage detection protection for the level signal exceeding the safety threshold, so as to prevent the chip and the system environment from being burned out. Contents of the invention [0004] The purpose of the present invention is to solve the above problems, and proposes an overvoltage protection circuit. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/20H02H9/04
CPCH02H3/20H02H9/042
Inventor 杨靖刘柳梅当民
Owner SICHUAN YICHONG TECH CO LTD
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