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Anti-lightning surge circuit of switching power supply and switching power supply using same

A switching power supply and surge circuit technology, applied in the field of switching power supply, can solve problems such as damage, limited energy of varistor 101, and unsatisfactory reliability, achieve simple and effective circuit structure, and improve the ability to prevent lightning surges , the effect of increasing reliability

Inactive Publication Date: 2012-07-18
杭州乐图光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the energy absorbed by the piezoresistor 101 is limited, and the number of times it can be reused is also limited, so that when the power supply is struck by lightning, the reliability cannot meet the requirements, and the possibility of damage is very high, especially in the case of lightning pulses

Method used

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  • Anti-lightning surge circuit of switching power supply and switching power supply using same
  • Anti-lightning surge circuit of switching power supply and switching power supply using same
  • Anti-lightning surge circuit of switching power supply and switching power supply using same

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Embodiment Construction

[0016] Several preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made on the spirit and scope of the present invention. In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0017] refer to figure 2 , shows a functional block diagram of the power supply with lightning surge protection circuit according to the first embodiment of the present invention. In this embodiment, different from the prior art, a passive sink network 201 connected between the rectifier circuit 103 and the filter capacitor 104 is used ...

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Abstract

The invention relates to an anti-lightning surge circuit of a switching power supply. The anti-lightning surge circuit comprises an inactive absorbing network, which is connected between a rectifying circuit and a filter capacitor of the switching power supply, wherein when lightning surge happens, the generated surge current is released through the inactive absorbing network; and when lightning surge does not happen, the inactive absorbing network does not work. According to the anti-lightning surge circuit of the switching power supply, the circuit structure is simple and effective, the anti-lightning surge ability of the power supply is improved, and the reliability of the power supply is increased.

Description

technical field [0001] The invention relates to a switching power supply, in particular to a lightning surge protection circuit of the switching power supply. Background technique [0002] As an inevitable natural phenomenon, lightning strike will produce an impact voltage with energy, generally between 1000 and 3000V. On the one hand, due to the highly integrated internal structure of electronic equipment (VLSI very large scale integrated circuit chip), resulting in The level of withstand voltage and overcurrent resistance decreases, and the ability to withstand lightning decreases; on the other hand, such a large impulse voltage transmitted to the interior of the electronic device is far higher than the withstand voltage value of the semiconductor device inside the electronic device, damaging the semiconductor device , and then make the entire electronic equipment (such as various power supplies) unable to work normally. [0003] refer to figure 1 , shows an implementati...

Claims

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Application Information

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IPC IPC(8): H02M1/32H02M7/06H02M3/335H02H9/04
Inventor 张晓峰
Owner 杭州乐图光电科技有限公司
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