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

Claim 0:
1. A totem-pole bridgeless power factor correction device comprising:
a power factor correction module comprising a first transistor and a second transistor connected in series, and a third transistor and a fourth transistor connected in series, wherein the first transistor and the second transistor are configured to achieve power factor correction, and the third transistor and the fourth transistor are configured to achieve synchronous rectification; and
a control module configured to:
in a first time period defined by a first voltage threshold and a second voltage threshold, control the third transistor and the fourth transistor to be off;
in the first time period and before a zero-crossing of an AC voltage applied to the power factor correction module, control the first transistor and the second transistor to be off;
in the first time period and after the zero-crossing of the AC voltage, control the first transistor and the second transistor such that at least one of the first transistor and the second transistor switches at a targeted switching frequency with a gradually increased duty cycle; and
after the first time period, control the first transistor and the second transistor to switch at a switching frequency lower than the targeted switching frequency.