Patent ID: 11929669
Assignee: INVENTCHIP TECHNOLOGY CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G  Y | IPC G  H

Claim 9:
10. A method comprising:
configuring a first transistor and a second transistor of a power factor correction module to achieve power factor correction, and configuring a third transistor and a fourth transistor of the power factor correction module to achieve synchronous rectification;
in a first time period defined by a first voltage threshold and a second voltage threshold on an AC voltage applied to the power factor correction module, configuring the third transistor and the fourth transistor to be off;
in the first time period and before a zero-crossing of the AC voltage, configuring the first transistor and the second transistor to be off;
in the first time period and after the zero-crossing of the AC voltage, configuring at least one of the first transistor and the second transistor to switch at a targeted switching frequency with a gradually increased duty cycle; and
after the first time period, configuring the first transistor and the second transistor to switch at a switching frequency lower than the targeted switching frequency.