Patent ID: 9722411
Date: 2017-08-01
CPC Classifications: H02H

Claim:
1. A secondary power system, which is used for supplying power for a load equipment, and comprises: a fuse circuit, a filter circuit, a convertor circuit and an over-voltage and under-voltage protection circuit, the fuse circuit, the filter circuit, the over-voltage and under-voltage protection circuit and the convertor circuit being sequentially connected in series; wherein, an input terminal of the fuse circuit is configured to be electrically connected to a primary power source, and the fuse circuit is capable of cutting off power supplied to a latter-stage circuit connected to an output terminal of the fuse circuit when an overcurrent occurs in the primary power source or the latter-stage circuit; the filter circuit is configured to suppress influence on the secondary power system caused by noise of the primary power source, and to prevent interference generated by the secondary power system from entering the primary power source at the same time; the over-voltage and under-voltage protection circuit is configured to cut off power supplied to the convertor circuit when power supplied by the primary power source is an under-voltage or over-voltage; and the convertor circuit is configured to convert a voltage provided by the primary power source into a voltage of a secondary power source required by the load equipment.