Power supply and filter of power supply

Abstract

The invention is applied to the field of power electronics and provides a power supply and a filter of the power supply. The filter of the power supply comprises a difference-mode voltage conservation grade used for filtering difference-mode interference voltage in grid voltage and then outputting the voltage, a common-mode voltage conservation grade used for filtering common-mode interference voltage in the voltage output by the difference-mode voltage conservation grade and output the voltage, and a residual voltage releasing grade used for providing a releasing passage for residual voltage of disturbance voltage in the voltage output by the common-mode voltage conservation grade. The filter of the power supply utilizes the responding time difference of the common-mode voltage conservation grade and the residual voltage releasing grade at medium strength applying time to disperse the sum of the residual voltage of the disturbance voltage on the common-mode voltage conservation grade and the residual voltage releasing grade. When the strength of media is tested, testing voltage is applied on the common-mode voltage conservation grade, through parameter selection of a voltage dependent resistor and a discharge tube, the combination of the voltage dependent resistor and the discharge tube is enabled to meet the requirements of the strength of the media and the requirements of lightning stroke resistance and impact voltage, so that the safe operation performance of electric equipment of the filter of the power supply is further improved.

Description

technical field [0001] The invention belongs to the field of power electronics, in particular to a power supply and a filter thereof. Background technique [0002] In the power industry, in order to ensure the safe operation of electrical equipment, it is necessary to consider the dielectric strength, and the ability to resist lightning strikes and impulse voltages in the design of electrical equipment, and make the dielectric strength, and the ability to resist lightning strikes and impulse voltages meet the requirements of the country or industry respectively. standard requirements. For this reason, a power filter needs to be added in the power supply of the electrical equipment. [0003] Such as figure 1 The circuit of the power supply filter provided by the prior art is shown, which uses the varistor RV2 and the discharge tube GD2, and the varistor RV3 and the discharge tube GD3 to form a common mode protection circuit, and uses the fuse F1, the fuse F2, the varistor ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a power filter, aiming at solving the problem of using the combination of varistor and discharge tube in the power filter provided by the prior art. Impulse voltage capability and dielectric strength cannot meet the requirements at the same time

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