Patent ID: 9257913
Filing Date: 2016-02-09
CPC Classification: H02M,Y02B

Claim Text:
1. A power conversion system, comprising: a resonant circuit, comprising: a controller operatively coupled to provide the first and second switching control signals as modulated signals to the switching circuit in each of a plurality of switching cycles to modify a voltage at the switching node to control a converter output voltage; a sensing circuit operatively coupled with the series circuit to provide a sense signal representing a resonant current flowing in the series circuit; and a detection circuit operatively coupled with the sensing circuit to receive the sense signal and operative to selectively provide a detection signal or value to the controller in a first state if an amplitude of the sense signal is below a predetermined threshold in a predetermined portion of a given half cycle of a given one of the plurality of switching cycles and to provide the detection signal or value in a different second state if the amplitude of the sense signal is greater than or equal to the predetermined threshold in the predetermined portion of the given half cycle; wherein the controller is operative to selectively modify the first and second switching control signals responsive to receiving the detection signal or value in the first state.