Patent ID: 8018743
Filing Date: 2011-09-13
Classification: H02M,Y02B

Abstract:
1. A method of operating a switching power converter, the method comprising: operating the switching power converter in pulse frequency modulation mode in a first output current range higher than a first output current level and lower than a second output current level; operating the switching power converter in pulse width modulation mode in a second output current range higher than a third output current level and lower than a fourth output current level, the third output current level being higher than the second output current level, and wherein between the second output current level and the third output current level the switching power converter is operated at either a first operating point associated with the third output current level or a second operating point associated with the second output current level thereby forming a control gap, the first operating point corresponding to a first operating frequency and a first duty cycle of the switching power converter and the second operating point corresponding to a second operating frequency and a second duty cycle of the switching power converter.