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

Claim 19:
20. A power adapter, wherein the power adapter comprises
a direct current DC-DC converter; and
a control system that comprises
a sampling control circuit, and
a power factor correction (PFC) circuit that comprises
an inductor,
a first power supply drive circuit,
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 that is connected to a load,
a second parallel connection point between the first bridge arm and the second bridge arm that is grounded,
a first bridge arm midpoint of the first bridge arm that 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 that 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;

the sampling control circuit is configured to:
control, based on voltages of the two ends of the alternating current power supply, the first lower bridge arm to be turned on, so that the first power supply drive circuit starts charging; and
when charging duration of the first power supply drive circuit reaches first target duration, control the first lower bridge arm to be turned off, so that the first power supply drive circuit completes charging; and an input end of the control system is connected to an alternating current power supply, and an output end of the control system is connected to an output end of the power adapter by using the DC-DC converter.