Patent ID: 11923769
Assignee: HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 11:
12. A method for controlling a totem pole power factor correction circuit, wherein the control method is applicable to a sampling control circuit in a control system, wherein the control system comprises a power factor correction PFC circuit and a sampling control circuit, the PFC circuit comprises an inductor, a first power supply drive circuit, and a first bridge arm and a second bridge arm that are connected in parallel, a first parallel connection point between the first bridge arm and the second bridge arm is connected to a load, a second parallel connection point between the first bridge arm and the second bridge arm is grounded, a first bridge arm midpoint of the first bridge arm is connected to a first connection end of an alternating current power supply by using the inductor, a second connection end of the alternating current power supply is connected to a second bridge arm midpoint of the second bridge arm, the first bridge arm midpoint is a serial connection point between a first upper bridge arm and a first lower bridge arm of the first bridge arm, one end of the sampling control circuit is connected to the alternating current power supply, the other end of the sampling control circuit is connected to the first lower bridge arm, a first connection end of the first power supply drive circuit is connected to the first upper bridge arm, and a second connection end of the first power supply drive circuit is connected to the first bridge arm midpoint;
and the method comprises:
controlling, by the sampling control circuit based on voltages of two ends of an alternating current power supply, a first lower bridge arm to be turned on, so that a first power supply drive circuit starts charging; and
when a charging duration of the first power supply drive circuit reaches a first target duration, controlling, by the sampling control circuit, the first lower bridge arm to be turned off, so that the first power supply drive circuit completes charging.