Patent ID: 9627988
Date: 2017-04-18
CPC Classifications: H02M,Y02B,Y02P

Claim:
1. A switch control circuit for controlling switching operations of first and second switches that control power supply of a resonant converter, the switch control circuit comprising: a half cycle signal generator to generate a half cycle signal according to a result of comparing a comparison voltage corresponding to an output voltage of the resonant converter to a first signal based on a current sense voltage according to a load of the resonant converter; and a frequency limit controller to differently limit a variation ratio of a frequency of a first clock signal according to a result of comparing a target on-time based on a first enable period in a previous switching cycle of a first clock signal for determining switching frequencies of the first and second switches to a first period beginning from an enable start time point of the first clock signal and ending at a point in time at which the half cycle signal is generated.