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Under-voltage and over-voltage protection circuit for power supply circuit

A technology of undervoltage and overvoltage, power supply circuit, which is applied in the direction of emergency protection circuit device, protection against undervoltage or no voltage, protection against overvoltage, etc., to reduce manufacturing cost, high reliability, and structure simple effect

Active Publication Date: 2014-03-26
BEIJING ESD POWER COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an undervoltage and overvoltage protection circuit for power supply circuits to solve the problem of undervoltage and overvoltage protection for switching power supply circuits

Method used

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  • Under-voltage and over-voltage protection circuit for power supply circuit
  • Under-voltage and over-voltage protection circuit for power supply circuit
  • Under-voltage and over-voltage protection circuit for power supply circuit

Examples

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Embodiment 1

[0030] Such as figure 1 Shown is an undervoltage and overvoltage protection circuit for a power supply circuit according to the first embodiment of the present invention, which is coupled to an external power supply and an external circuit, and includes a protection unit 101 and a control unit 102, wherein,

[0031] The protection unit 101 is coupled to the external power supply and the control unit 102, and is used to clamp or divide the supply voltage when the external power supply is under-voltage or over-voltage. The current corresponding to the processed voltage is sent to the control unit 102;

[0032] The control unit 102 is coupled to the protection unit 101 and an external circuit, and is configured to receive the current sent by the protection unit 101 to supply power to the external circuit. At the same time, when the protection unit 101 receives When the current value of is less than the minimum shut-off current value, the coupling with the external circuit is turned of...

Embodiment 2

[0041] Now combined Figure 2 to 4 , The specific application of the undervoltage and overvoltage protection circuit for the power supply circuit is described:

[0042] Such as figure 2 As shown in the prior art, in the switching power supply control circuit, although the switching power supply control device of model DPA423 is used to turn off or turn on the whole circuit, the overvoltage or undervoltage of the input voltage will cause the DPA423 Failure or even damage. Therefore, undervoltage and overvoltage protection circuits are added to the circuit structure. image 3 Shown.

[0043] Practical applications, image 3 The actual circuit corresponding to the circuit block diagram shown is as follows Figure 4 Shown is the actual circuit corresponding to the undervoltage and overvoltage protection circuit 20 for the power supply circuit in a specific application, where:

[0044] R1 and R4 are voltage divider resistors, R2, R3 and R5 are current-limiting resistors, D3 is a voltag...

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PUM

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Abstract

The invention discloses an under-voltage and over-voltage protection circuit for a power supply circuit, which is coupled to an external power supply and an external circuit. The under-voltage and over-voltage protection circuit comprises a protection unit and a control unit, wherein the protection unit is coupled to the external power supply and the control unit, and is used for carrying out clamping processing or partial pressure processing on a power supply voltage when the power supply of the external power supply is under-voltage or over-voltage and sending current corresponding to the voltage after being processed to the control unit; the control unit is coupled to the protection unit and the external circuit, and is used for receiving the current sent by the protection unit so as to supply power to the external circuit, and meanwhile turning off the coupling with the external circuit when the value of the received current sent by the protection unit is smaller than the minimum turn-off current value so as to carry out under-voltage protection on the external circuit, or turning off the coupling with the external circuit when the value of the received current sent by the protection unit is greater than the maximum turn-off current value so as to carry out over-voltage protection on the external circuit. The under-voltage and over-voltage protection circuit solves the problem of under-voltage and over-voltage protection for a switch power supply circuit.

Description

Technical field [0001] The invention relates to the field of electronic circuits, and in particular to an undervoltage and overvoltage protection circuit for power supply circuits. Background technique [0002] At present, with the rapid development of semiconductor technology, integrated circuits have been used in various fields, especially for power control switching circuits, such as: DC-DC circuits (miniature switching power supply circuits), which have been widely used in power electronics, Military industry, scientific research, industrial control equipment, communication equipment, instrumentation, switching equipment, access equipment, mobile communication, router communication, industrial control, automotive electronics, aerospace and other fields. Due to the short design cycle, high reliability, and easy system upgrade characteristics of the DC-DC circuit to build a power system, DC-DC circuits are more and more widely used. With the extensive use of semiconductor tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/10H02H3/20H02H3/24
Inventor 梁东李伟辛剑明刘冬月
Owner BEIJING ESD POWER COMM