Quick power failure detection system based on flyback topology, and method

A flyback topology, power-down detection technology, applied in measuring devices, measuring electrical variables, measuring current/voltage, etc., can solve problems such as insufficient data storage of single-chip microcomputer

Inactive Publication Date: 2019-02-12
JIANGSU LINYANG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention solves the problem that the single-chip microcomputer is not enough for data storage after the power supply system of the flyback topology is powered off, and proposes a fast power-down detection method to improve the storage time

Method used

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  • Quick power failure detection system based on flyback topology, and method
  • Quick power failure detection system based on flyback topology, and method
  • Quick power failure detection system based on flyback topology, and method

Examples

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Effect test

Embodiment 1

[0036] Based on the flyback topology, when the load output is reverse rectified, the threshold voltage is set to DC200V. When the input power supply voltage is 210V, it is greater than the set threshold voltage, and the voltage after the voltage division by the voltage dividing resistor is less than the conduction voltage of the transistor Q1, the transistor Q1 will be cut off, and the detection signal is at a high level at this time; the input power supply voltage is 190V When it is greater than the set threshold voltage, the voltage after the voltage division by the voltage dividing resistor is greater than the conduction voltage of the transistor Q1, the transistor Q1 will be conducted, the detection signal of the single-chip microcomputer is low level, and the output voltage of the load power supply is a stable DC voltage .

Embodiment 2

[0038] Based on the flyback topology, when the load output is forward rectified, the threshold voltage is set to DC200V. When the input power supply voltage is 210V, it is greater than the set threshold voltage, and the voltage after the voltage division by the voltage dividing resistor is greater than the conduction voltage of the triode Q1, the triode Q1 will be turned on, and the detection signal is at a low level at this time; the input power supply voltage is When 190V is lower than the set threshold voltage, the voltage after the voltage division by the voltage divider resistor is lower than the conduction voltage of the transistor Q1, the transistor Q1 will be cut off, the detection signal of the single-chip microcomputer is high level, and the output voltage of the load power supply is a stable DC voltage .

[0039] The fast power-off detection circuit based on the flyback topology of the present invention effectively solves the problem of insufficient data storage aft...

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PUM

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Abstract

The invention discloses a quick power failure detection system based on flyback topology, and a method. The system is used for adding a forward circuit into a secondary output winding side for power failure detection. The forward circuit is used for power failure detection. The power failure detection system comprises a rectifying circuit, a filtering circuit, a voltage division circuit, a protection circuit and a signal conversion circuit, wherein the rectifying circuit, the filtering circuit, the voltage division circuit, the protection circuit and the signal conversion circuit are connectedin series in sequence; and finally, a digital signal generated by power failure is sent to a single chip microprocessor. On the basis of a situation that an original flyback topology power supply system is not affected, energy stored by an input side electrode after power failure happens is effectively utilized for the single chip microprocessor to store data.

Description

technical field [0001] The invention relates to a fast power-off detection system and method based on flyback topology, which can adjust the power-off threshold through parameter adjustment and setting, and better utilize the energy of the high-voltage electrolytic capacitor at the input end to increase the power-off storage time , does not affect the power supply system of the original flyback topology, especially suitable for occasions with high requirements for power-down storage time. Background technique [0002] When the single-chip microcomputer is running normally, the data in the data memory (RAM) will be lost due to a sudden power failure for some reason. In some applications such as measurement, control and other fields, the single-chip microcomputer collects and calculates some important data during normal operation, and these important data need to be restored after the next power-on. Therefore, in some single-chip application systems without a backup power sup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/165
CPCG01R19/16528
Inventor 张美仙杨金土朱佳伟汤文泉张珊珊
Owner JIANGSU LINYANG ENERGY CO LTD
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