Patent ID: 7489528
Filing Date: 2009-02-10
Classification: H02M,Y02B,Y04S

Abstract:
1. A current-to-voltage conversion circuit having an active state and a deactivated state, comprising: an input section to input an input power; a transformer to convert the input power into an output power; an output section to output the output power; a first circuit to stop a power supply to the transformer and put the current-to-voltage conversion circuit into a deactivated state when the output section is in a no-load state or a standby state, wherein said first circuit includes a first comparator to compare an output current on a secondary side of the transformer and a threshold current; a second circuit to start a power supply to the transformer and put the current-to-voltage conversion circuit into an active state when a voltage from external of the current-to-voltage conversion circuit is applied to the output section; a drive control circuit to drive the transformer; and a first coupler circuit including a photo-coupler to couple an output of the first comparator and an input of the drive control circuit.