US 12,301,100 B2
Power factor correction circuit and power converter
Ken Chin, Shenzhen (CN); Yuanjun Liu, Shenzhen (CN); and Zhixiang Hu, Dongguan (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Guangdong (CN)
Filed on Feb. 13, 2023, as Appl. No. 18/168,515.
Application 18/168,515 is a continuation of application No. PCT/CN2020/112324, filed on Aug. 29, 2020.
Prior Publication US 2023/0198381 A1, Jun. 22, 2023
Int. Cl. H02M 1/42 (2007.01); H02M 1/32 (2007.01); H02M 1/44 (2007.01); H02M 3/04 (2006.01); H02M 7/217 (2006.01)
CPC H02M 1/4208 (2013.01) [H02M 1/32 (2013.01); H02M 1/44 (2013.01); H02M 3/04 (2013.01); H02M 7/217 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power factor correction (PFC) circuit, wherein the PFC circuit comprises an alternating current input circuit, a totem-pole PFC circuit, an input sampling circuit, an output sampling circuit, and a PFC control protection circuit,
wherein a first output terminal of the alternating current input circuit is respectively connected to a first input terminal of the totem-pole PFC circuit and a first input terminal of the input sampling circuit, a second output terminal of the alternating current input circuit is respectively connected to a second input terminal of the totem-pole PFC circuit and a second input terminal of the input sampling circuit, an output terminal of the totem-pole PFC circuit is connected to an input terminal of the output sampling circuit, an output terminal of the output sampling circuit is connected to a first input terminal of the PFC control protection circuit, a first output terminal of the input sampling circuit and a second output terminal of the input sampling circuit are respectively connected to a second input terminal of the PFC control protection circuit and a third input terminal of the PFC control protection circuit, and an output terminal of the PFC control protection circuit is connected to a third input terminal of the totem-pole PFC circuit;
wherein the PFC control protection circuit is configured to control an output voltage of the totem-pole PFC circuit based on a first sampling voltage input at the first input terminal of the PFC control protection circuit, and the PFC control protection circuit is further configured to: when the alternating current input circuit outputs a negative voltage, perform overvoltage protection on the totem-pole PFC circuit based on a second sampling voltage input at the third input terminal, wherein when the alternating current input circuit outputs the negative voltage, an output voltage at the first output terminal of the alternating current input circuit is less than an output voltage at the second output terminal of the alternating current input circuit.