Abstract:

At present,A-type residual current protector is used in the main charging piles in China.Due to the protection limitation of A-type residual current protector,it is unable to effectively protect the charging pile fault in an all-round way.In order to meet the development needs of the charging pile industry,this paper studies and designs a magnetic modulation DC residual current protector.The mathematical model of the working principle of the magnetic modulator is analyzed,and the relationship between the primary winding,the secondary winding and the measured load current of the magnetic modulator is analyzed.The design adopts the double core magnetic modulation technology scheme.The magnetic modulation DC residual current protector can realize the combined protection function of the DC 6 mA residual current protector and the A-type residual current protector.

Key words: magnetic modulation, residual current protector, charging post, software design