A frequency converter pre-charge device

Abstract

The utility model relates to a kind of frequency converter pre-charging device including power module, grade switch module, transformer, switching switch module, rectifier module and filter module;Grade switch module includes first grade switch, second grade switch and third grade switch;Grade switch module connects power module and transformer primary side;Different grade switches are closed to adapt the voltage grade of frequency converter;Switching switch module includes first switching switch, second switching switch, third switching switch and fourth switching switch;Switching switch module connects transformer secondary side;Switching switch module is the output end of switching switch module;Different switching switches are closed to make different charging voltage be provided in different charging stage of frequency pre-charging device;The output of switching switch module is connected rectifier module, filter module and output module in turn;The corresponding charging voltage is output after output module. The present application can automatically charge frequency converter, and charging is convenient and easy to operate.

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