A New Energy Recovery Circuit for the Capacitive Load using the Current-Balance Transformer

This paper proposes a new recovery circuit for the capacitive load. Connecting the one side of windings to the load together, the resonant current is shared in both windings, hence the conduction loss is reduced. Simple circuit structure with transformer achieves the reduced the number of devices. Furthermore, the current-balance transformer enables ZVS operation of the switching device. To confirm the validity of the proposed circuit, prototype hardware with 12-inch mercury-free flat fluorescent lamp is experimented. The results are compared with a conventional energy-recovery circuit in perspective of luminance performances.