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Power supply undervoltage protection circuit with hysteresis window wide range input

A power supply undervoltage and protection circuit technology, which is applied in the direction of protection against undervoltage or no voltage, can solve the problems of easy oscillation of the output voltage, easy false triggering of the circuit, poor anti-interference ability, etc., and is not easy to falsely trigger. , High reliability and good stability

Inactive Publication Date: 2017-07-21
NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional input under-voltage protection circuit is prone to oscillate output voltage near the under-voltage protection point, the circuit is easy to trigger by mistake, and the anti-interference ability is poor

Method used

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  • Power supply undervoltage protection circuit with hysteresis window wide range input

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with accompanying drawing:

[0011] Such as figure 1 As shown, the power supply undervoltage protection circuit with hysteresis window and wide range input in this embodiment includes a comparator N3, a reference source N1, a voltage divider circuit, a voltage regulator circuit and a switch circuit. The voltage divider circuit is connected in series by a resistor R2 and a resistor R3 Composition, the inverting input terminal of the comparator N3 is connected between the resistor R2 and the resistor R3, the other end of the resistor R3 is grounded, and the other end of the resistor R2 is the voltage input terminal of the power supply undervoltage protection circuit; the non-inverting input terminal of the comparator N3 The terminal is connected to the cathode of the reference source N1 through the resistor R4, the anode of the reference source N1 is grounded, its reference terminal is grounded through t...

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PUM

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Abstract

The invention relates to a power supply undervoltage protection circuit with hysteresis window wide range input. The power supply undervoltage protection circuit comprises a comparator N3, a reference source N1, a voltage divider circuit, a voltage stabilizing circuit, and a switching circuit. The inverting input end of the comparator N3 is connected to a node between a resistor R2 and a resistor R3 connected in series. The other end of the resistor R3 is grounded, and the other end of the resistor R2 is used as a voltage input end. The noninverting input end of the comparator N3 is connected to the cathode of the reference source N1 through a resistor R4, the anode of the reference source N1 is grounded, and the reference end is grounded through a capacitor C1. The output end of the comparator N3 is connected to the input end of the switch circuit, and the noninverting input end of the comparator N3 is connected to the output end through a resistor R5. The input end of the voltage stabilizing circuit is grounded, and the output end is connected to the inverting input end of the comparator N3. The power supply undervoltage protection circuit of the invention has the advantages of a simple circuit, little possibility of false triggering, good stability, high anti-interference ability, and high reliability.

Description

technical field [0001] The invention relates to a power supply undervoltage protection circuit, in particular to a power supply undervoltage protection circuit with hysteresis window and wide-range input. Background technique [0002] The input undervoltage protection circuit is the core protection unit of the power module. Its function is to shut down the module when the input voltage of the module is lower than the normal working voltage range, so as to protect the internal components of the module from damage. Conventional input under-voltage protection circuits are prone to oscillate in the output voltage near the under-voltage protection point, the circuit is prone to false triggering, and the anti-interference ability is poor. Contents of the invention [0003] The purpose of the present invention is to provide a power supply undervoltage protection circuit with hysteresis window and wide-range input, which is not easy to generate false triggers and has strong anti-i...

Claims

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Application Information

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IPC IPC(8): H02H3/24
CPCH02H3/24
Inventor 杨正男胡进张石磊吴磊袁宝山郭靖赵隆冬胡海斌马升杰刘航志王粤桦
Owner NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC
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