Patent ID: 9735665
Date: 2017-08-15
CPC Classifications: H02M

Claim:
1. A circuit for use in a power converter, comprising: a control circuit coupled to detect whether an electrical energy source is coupled to an input of the power converter; and a switch coupled to the control circuit and coupled to transfer energy from the input of the power converter to an output of the power converter during a first operating mode, wherein the control circuit is coupled to drive the switch in the first operating mode when the electrical energy source is coupled to the input of the power converter, wherein the control circuit is coupled to drive the switch in a second operating mode when the electrical energy source is uncoupled from the input of the power converter, wherein the control circuit is further coupled to drive the switch in the second operating mode to discharge a capacitance coupled between input terminals of the power converter to a threshold voltage in less than a maximum period of time.