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Overvoltage Protection Circuit

A protection circuit and overvoltage technology, which is applied in the direction of emergency protection circuit devices, electrical components, output power conversion devices, etc., can solve problems such as shutdown of external systems, failure to use normally, and user distress

Active Publication Date: 2020-07-31
亚荣源科技(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional overvoltage protection circuit cannot distinguish between the two, so that when the user operates the external system normally and causes back electromotive force feedback, the traditional overvoltage protection circuit will still control the switching power supply device to immediately reduce its output voltage The size of the over-voltage protection, this will cause the external system to shut down and cannot be used normally, causing users a lot of trouble

Method used

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  • Overvoltage Protection Circuit

Examples

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Embodiment Construction

[0008] exist figure 1 Among them, the switching power supply device 100 includes a noise filter 110, an AC-DC conversion circuit 120, a power stage (Power stage) 130, a transformer 140, a rectifier circuit 150, an energy storage unit 160, a feedback circuit 170 and a signal isolation unit 180. In this example, the transformer 140 has two primary windings and one secondary winding, and one of the primary windings of the transformer 140 can pass through the power stage 130, The AC-DC conversion circuit 120 and the noise filter 110 are coupled to the input voltage VIN. The noise filter 110 can be an EMI filter, and users can decide whether to use the noise filter 110 .

[0009] In addition, the AC-DC conversion circuit 120 can be a bridge rectifier (Bridge rectifier). As for the power stage 130, it has a PWM control circuit 132 and a power transistor 134 used as a switch. The power transistor 134 can be connected in series with the primary winding of the power stage 130 in th...

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PUM

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Abstract

An overvoltage protection circuit, which can distinguish whether the overvoltage state of the output voltage of the switchable power supply device is caused by internal feedback failure or external power supply, and can use the time difference of starting overvoltage protection to avoid the short-term and harmless external power influence The switching power supply device works normally, but when the internal feedback of the switching power supply device fails, it can stop the operation of the switching power supply device in real time to achieve protection.

Description

technical field [0001] The present invention relates to an overvoltage protection circuit, in particular to an overvoltage protection circuit suitable for a switching power supply device. Background technique [0002] A general switching power supply device (Switching power supply) will use an overvoltage protection circuit to control the pulse width modulation (PWM) in the switching power supply device when the output terminal of the switching power supply device has an overvoltage. Modulation, PWM) control circuit stops outputting the pulse width modulation signal, and then reduces the output voltage of the output terminal, so as to protect the internal circuit of the switching power supply device and the internal circuit of the external system of the output terminal from overvoltage, avoiding the two Either one of them is damaged. [0003] The output end will exhibit overvoltage due to two situations. One is caused by the failure of the internal circuit of the switching ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32H02H7/125
CPCH02H7/1252H02H7/1255H02M1/32H02M1/325
Inventor 尹葵许志源
Owner 亚荣源科技(深圳)有限公司