| 摘要 |
PROBLEM TO BE SOLVED: To make the overcurrent protection function fully workable when an arm of the switching element of an inverter is short-circuited through restricting the increase in the bias current of a DC reactor by bypassing the part of a charging current of a snubber capacitor of the inverter, when an inverter having DC reactor shifts from a reflux mode to a power mode. SOLUTION: In an inverter equipment, in which a return diode 3 is connected in parallel to a DC reactor 2 for restricting a current rise rate between a DC voltage source 1 and an inverter 7 and a snubber circuit 4, is connected in parallel with the return diode 3, an LC series circuit 14 of a capacitor 15 and a reactor 16 is connected in parallel to the DC reactor 2, and the LAC parallel circuit 14 functions as a bias current increase which restricts circuit of the DC reactor 2. By doing this, the inverter overcurrent protection circuit 13 can be operated reliably. |
