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Surge overvoltage absorption circuit used for power device

A power device and absorbing circuit technology, applied in the field of power device surge overvoltage absorbing circuit, can solve the problems of inability to effectively limit damage and low surge absorbing capacity, and achieve the effects of simple structure, low cost and high reliability

Inactive Publication Date: 2017-02-15
CHANGSHA QUNRUI ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common disadvantage of the above three circuits is that the ability to absorb surges is very low, so it cannot effectively limit the damage caused by lightning overvoltage to electronic equipment

Method used

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  • Surge overvoltage absorption circuit used for power device
  • Surge overvoltage absorption circuit used for power device

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Embodiment Construction

[0014] In order to make the technical means, creation features, achievement goals and functions realized by the present invention easy to understand and understand, the present invention is further described below with reference to the specific illustrations.

[0015] see figure 2 As shown, a surge overvoltage absorption circuit for a power device of the present invention includes a power device (1), a surge suppression circuit (2), and a lightning protection circuit (3), the power device (1), The surge suppression circuit (2) and the lightning protection circuit (3) are electrically connected in sequence.

[0016] The power device (1) according to claim 1, characterized in that: the power device is composed of Q1 and Q2 connected in series.

[0017] The surge suppression circuit (2) according to claim 1, characterized in that: the surge suppression circuit consists of R1, C1, R2, and C2 connected in series.

[0018] The lightning protection circuit (3) according to claim 1...

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PUM

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Abstract

The invention relates to a surge overvoltage absorption circuit used for a power device. The circuit comprises a power device (1), a surge suppression circuit (2) and a lightning protection circuit (3), wherein the power device (1), the surge suppression circuit (2) and the lightning protection circuit (3) are electrically connected in sequence. The circuit has the advantages of simple structure, low cost and high reliability.

Description

technical field [0001] The invention relates to a surge overvoltage absorption circuit for power devices. Background technique [0002] Switching power supplies are widely used, and the safe use of their equipment has become an important lesson. Nowadays, the power grid transmission lines are frequently switched by various resistive, capacitive and inductive loads. Normal operation, especially lightning overvoltage caused a lot of damage to electronic equipment. Therefore, it is necessary to add a limiting lightning overvoltage protection circuit to the existing circuit absorbing sharp pulses. [0003] Typical high-power power electronic power device snubber circuits have three forms, such as figure 1 shown. figure 1 (a) is a snubber circuit composed of a single low-inductance absorption capacitor, which is suitable for low-power power electronic power devices, can effectively suppress surge voltage, and has low circuit cost. The disadvantage of this circuit is that it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02H9/04
CPCH02M1/32H02H9/04
Inventor 黄建国
Owner CHANGSHA QUNRUI ELECTRONICS TECH CO LTD