Patent ID: 7607896

Claim:
A method implemented in a drive for electrical equipment, the drive having a converter section, a capacitor bank and an inverter section, the method comprising: detecting a beginning of a ride-through event; disabling the converter section of the drive in response to detecting the beginning of the ride-through event, wherein disabling the converter section comprises actively controlling the converter section to prevent the converter section from converting an AC voltage on an input line to a DC voltage at the capacitor bank; drawing power from the capacitor bank during the ride-through event to maintain operation of the inverter section; detecting an end of the ride-through event; and resuming operation of the converter section of the drive in response to detecting the end of the ride-through event, wherein resuming operation of the converter section comprises actively controlling the converter section to cause the converter section to convert the AC voltage on the input line to the DC voltage at the capacitor bank and to limit current flowing to the capacitor bank.