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Overvoltage protection circuit and switching power supply

An overvoltage protection circuit and circuit technology, applied in emergency protection circuit devices, electrical components and other directions, can solve the problems of affecting the service life, component damage of switching power supply, unstable mains voltage, etc., to achieve overvoltage protection, The effect of preventing damage

Pending Publication Date: 2018-02-09
HEFEI HUIKE JINYANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides an overvoltage protection circuit and a switching power supply, aiming to solve the problem in the prior art that the components of the switching power supply will be damaged and the service life will be affected due to the instability of the mains voltage

Method used

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  • Overvoltage protection circuit and switching power supply

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Embodiment 1

[0047] figure 1 The structure of an overvoltage protection circuit 100 provided by an embodiment of the present invention is shown. For the convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows:

[0048] Such as figure 1 As shown, an overvoltage protection circuit 100 provided by an embodiment of the present invention includes an overvoltage detection module 110 , a switch module 120 , an input module 130 and an output module 140 .

[0049] The output terminal of the overvoltage detection module 110 is connected to the controlled terminal of the switch module 120 , the output terminal of the input module 130 is connected to the input terminal of the switch module 120 , and the output terminal of the switch module 120 is connected to the input terminal of the output module 140 .

[0050] The input terminal of the overvoltage detection module 110 receives an external sampling signal Sample, and th...

Embodiment 2

[0061] Embodiment 2 is a further refinement of the structure of the overvoltage protection circuit 100 provided in Embodiment 1.

[0062] Such as figure 2 As shown, in one embodiment of the present invention, figure 1 The overvoltage detection module 110 includes a voltage division unit 111 and a comparison unit 112 .

[0063] The input terminal of the voltage dividing unit 111 is the input terminal of the overvoltage detection module 110 , the output terminal of the voltage dividing unit 111 is connected to the input terminal of the comparison unit 112 , and the output terminal of the comparison unit 112 is the output terminal of the overvoltage detection module 110 .

[0064] The voltage dividing unit 111 receives the sampling signal Sample for voltage dividing processing and then outputs the down-voltage sampling signal to the comparison unit 112 , and the comparison unit 112 controls the switch module 120 to be in an off state or an on-state according to the voltage of t...

Embodiment 3

[0073] Embodiment 3 is a further refinement of the structure of the overvoltage protection circuit 100 provided in Embodiment 2.

[0074] Such as image 3 As shown, in one embodiment of the present invention, figure 2 The voltage dividing unit 111 includes a first resistor R1, a second resistor R2, a third resistor R3 and a first capacitor C1.

[0075] The first end of the first resistor R1 is the input end of the voltage dividing unit 111, the second end of the first resistor R1 is connected to the first end of the second resistor R2, and the second end of the second resistor R2 is connected to the first end of the third resistor R3. One terminal is commonly connected with the first terminal of the first capacitor C1 to form the output terminal of the voltage dividing unit 111 , and the second terminal of the third resistor R3 is commonly connected with the second terminal of the first capacitor C1 to the ground.

[0076] In this embodiment, the voltage dividing unit 111 c...

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Abstract

The invention discloses an overvoltage protection circuit and a switching power supply. The circuit receives an external sampling signal through an overvoltage detection module, and receives an external AC signal through an input module. When the voltage of the sampling signal is less than or equal to a preset threshold value, the overvoltage detection module controls a switching module to be in aconnected state, and an output module outputs a power supply signal. When the voltage of the sampling signal is greater than the threshold value, the overvoltage detection module controls the switching module to be in a disconnected state, and the output module stops the outputting of the power supply signal. The switching power supply comprises the overvoltage protection circuit, a power management circuit and an AC-DC conversion circuit. The AC-DC conversion circuit is used for converting the connected commercial power into a direct current for supplying power to power utilization equipment. The power management circuit is used for controlling the working state of the AC-DC conversion circuit according to the power supply signal outputted by the overvoltage protection circuit. The overvoltage protection circuit achieves the overvoltage protection of the circuit, and protects the overvoltage from causing damages to circuit elements.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to an overvoltage protection circuit and a switching power supply. Background technique [0002] According to the current design standard of switching power supply, the input voltage is set within the range of AC 90V-264V. The mains power in most areas of our country can meet this standard. However, in some special areas, such as remote mountainous areas or third-party countries, the mains voltage is extremely unstable due to the unstable power supply system, and sometimes the mains voltage may exceed 380V. This extremely high voltage will cause irreversible damage to the switching power supply, and may even cause disasters such as fire. If in order to avoid this situation, the specifications of the components in the switching power supply are increased, such as the rated voltage of the capacitor is set to 600V, and the withstand voltage of the MOS tube and Schottky is incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/125
CPCH02H7/1252
Inventor 王智勇王平
Owner HEFEI HUIKE JINYANG TECH
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