Lightning protection device and inverter

Abstract

The invention provides a lightning protection device and an inverter, the lightning protection device comprises a first overvoltage protector and a second overvoltage protector which are connected inseries between a protected line and the ground, the first overvoltage protector is connected with the protected line, and the second overvoltage protector is grounded. Moreover, the lightning protection device also comprises a voltage regulation circuit, and the voltage regulation circuit at least comprises a first voltage division circuit which is connected in parallel with the two ends of the second overvoltage protector. When the lightning protection device is in a normal working condition, the first voltage division circuit is used for adjusting the voltage drop of the first overvoltage protector or the second overvoltage protector. By adjusting the impedance value of the first voltage division circuit, the voltage drop on the second overvoltage protector (or the first overvoltage protector) is reduced, so that the voltage withstanding performance requirement of the second overvoltage protector (or the first overvoltage protector) is reduced, and the hardware cost of the lightningprotection device is further reduced.

Description

technical field [0001] The invention belongs to the technical field of lightning protection, and in particular relates to a lightning protection device and an inverter. Background technique [0002] At present, lightning protection devices usually use a combination of metal-oxide varistor (MOV) and gas discharge tube (GAS). Since the equivalent impedance of MOV is about tens of megohms, while the The equivalent impedance is very large, usually up to gigaohms. It can be seen that the impedance of the gas discharge tube is much larger than that of the MOV. According to the larger the impedance in the series circuit, the higher the partial voltage is. Under normal circumstances, most of the voltage of the protected line It is borne by a gas discharge tube, especially in a high-voltage system. Therefore, it is necessary to select a gas discharge tube with a high withstand voltage. However, there are few gas discharge tubes with a high withstand voltage on the market at present, ...

AI Technical Summary

Problems solved by technology

[0002] At present, lightning protection devices usually use a combination of metal-oxide varistor (MOV) and gas discharge tube (GAS). Since the equivalent impedance of MOV is about tens of megohms, while the The equivalent impedance is very large, usually up to gigaohms. It can be seen that the impedance of the gas discharge tube is much larger than that of the MOV. According to the larger the impedance in the series circuit, the higher the partial voltage is. Under normal circumstances, most of the voltage of the protected line It is borne by the gas discharge tube, especially in the high-voltage system. Therefore, it is necessary to choose a gas discharge tube with a high withstand voltage. However, there are few gas discharge tubes with a high withstand voltage on the market at present, and the cost is very high.

Images