An AC current source circuit converts a DC input voltage into an AC output current, and comprises a chopper circuit for converting a DC input voltage into a chopper voltage; and an inverter for converting the chopper voltage into an output AC current of a predetermined frequency. The inverter comprises...http://www.google.co.uk/patents/US5892675?utm_source=gb-gplus-sharePatent US5892675 - AC current source circuit for converting DC voltage into AC current
