公开(公告)号：US20240128876A1

公开(公告)日：2024-04-18

申请号：US18335195

申请日：2023-06-15

申请人： Richtek Technology Corporation

发明人： Yu-Chang Chen ,  Ta-Yung Yang ,  Kun-Yu Lin ,  Fu-Ciao Syu ,  Chia-Hsien Yang ,  Hsin-Yi Wu

IPC分类号： H02M3/335 ,  H02M1/08

CPC分类号： H02M3/33507 ,  H02M1/083

摘要： A switching control circuit for use in controlling a resonant flyback power converter generates a first driving signal and a second driving signal. The first driving signal is configured to turn on the first transistor to generate a first current to magnetize a transformer and charge a resonant capacitor. The transformer and charge a resonant capacitor are connected in series. The second driving signal is configured to turn on the second transistor to generate a second current to discharge the resonant capacitor. During a power-on period of the resonant flyback power converter, the second driving signal includes a plurality of short-pulses configured to turn on the second transistor for discharging the resonant capacitor. A pulse-width of the short-pulses of the second driving signal is short to an extent that the second current does not exceed a current limit threshold.