US 12,489,362 B2
Power supply apparatus and totem-pole PFC circuit control method
Ken Chin, Shenzhen (CN); Yuanjun Liu, Shenzhen (CN); Shanglin Mo, Dongguan (CN); and Liangyun Kang, Shenzhen (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Oct. 30, 2023, as Appl. No. 18/497,110.
Application 18/497,110 is a continuation of application No. PCT/CN2021/091692, filed on Apr. 30, 2021.
Prior Publication US 2024/0072647 A1, Feb. 29, 2024
Int. Cl. H02M 1/42 (2007.01); H02M 3/158 (2006.01)
CPC H02M 1/42 (2013.01) [H02M 3/158 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A power supply apparatus, comprising:
a totem-pole power factor correction (PFC) circuit and a control apparatus, the totem-pole PFC circuit comprises a first switching transistor and a second switching transistor, a source of the first switching transistor and a drain of the second switching transistor are jointly connected to a first reference point, and a first input end of an alternating current input source is connected to the first reference point through an inductor;
the control apparatus comprises a controller and a dead time detection circuit, wherein the dead time detection circuit comprises a detection capacitor and a detection resistor, a first end of the detection capacitor is connected to the first reference point, a second end of the detection capacitor is connected to a first end of the detection resistor, and a second end of the detection resistor is grounded; and
the controller is configured to: generate a first dead time control signal and a second dead time control signal based on a voltage of the detection resistor and polarity of a voltage input by the alternating current input source, control an on/off status of the first switching transistor based on the first dead time control signal, and control an on/off status of the second switching transistor based on the second dead time control signal.