Patent ID: 6525490
Filing Date: 2003-02-25
Classification: H02M

Abstract:
A power control circuit for connection to an AC supply circuit for supplying AC current to a load, comprising:a bilateral, very high speed power control switch for connection in series with the load; a bilateral, very high speed energy return switch for connection in parallel with the load; a driver circuit connected to each of said power control switch and said energy return switch for controlling the opening and closing of said switches, said driver circuit being configured to cause said energy return switch to be open when said power control switch is closed and said energy return switch to close when said power control switch opens; a timer circuit operatively connected to said driver circuit for controlling the operation of said driver circuit so that said power control switch is closed for at least a predetermined initial time period and a discrete predetermined final time period during each half cycle of the AC current; and a power supply circuit for connection to the AC supply circuit for supplying power to said driver circuit and said timer circuit.