Patent ID: 11955884
Assignee: RICHTEK TECHNOLOGY CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 4:
5. The resonant switching power converter circuit according to claim 1, wherein the control circuit includes:
a duty ratio determination circuit, which is configured to compare a ramp-up voltage at a ramp-up node with a periodic waveform signal, so as to generate a duty ratio signal;
a duty ratio distribution circuit, which is configured to generate the first control signal and the at least one second control signal according to the duty ratio signal; and
a ramp-up voltage generation circuit, which is coupled to the duty ratio determination circuit and which is configured to generate the ramp-up voltage at the ramp-up node in the start-up mode;
wherein the ramp-up voltage at the ramp-up node increases gradually in the start-up mode, so that the duty ratios of the first control signal and the at least one second control signal increase gradually.