Charging device in advance

The utility model provides a charging device in advance, belongs to dc -to -ac converter precharge field, dc -to -ac converter after the specially adapted is changed. To change back when the dc -to -ac converter in order solving under the common condition, need to stop the rectification, close the inlet wire switch of dc -to -ac converter, and then start the rectification, could drop into the problem of the dc -to -ac converter after the change. The device includes first contactor 10, second contactor 20, starting switch 6, alternating current 220V switch 4, direct current 24V switch 5, time relay 80, auxiliary relay 70, alternating current 220V commentaries on classics direct current 24V power module 9, precharging resistor 3. After the dc -to -ac converter trouble, behind this device of use, reach under the circumstances of rectifier that does not stop, the switch switch that closes, quick recovering change back dc -to -ac converter device move, have reduced the purpose of shutting down the time of processi