US 12,294,296 B2
Totem pole power factor correction circuit and method of operating the same
Chun-Hao Huang, Taoyuan (TW); Chun-Wei Lin, Taoyuan (TW); I-Hsiang Shih, Taoyuan (TW); Ching-Nan Wu, Taoyuan (TW); and Jia-Wei Yeh, Taoyuan (TW)
Assigned to DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed by DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed on Feb. 22, 2023, as Appl. No. 18/112,733.
Claims priority of application No. 202211206638.1 (CN), filed on Sep. 30, 2022.
Prior Publication US 2024/0113615 A1, Apr. 4, 2024
Int. Cl. H02M 1/42 (2007.01); H02M 1/00 (2006.01)
CPC H02M 1/4216 (2013.01) [H02M 1/0009 (2021.05); H02M 1/4233 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A Totem Pole power factor correction circuit, when configured to convert a DC power to an AC power, comprising:
at least one fast-switching leg, each fast-switching leg comprising a fast-switching upper switch and a fast-switching lower switch,
a slow-switching leg, coupled to the at least one fast-switching leg in parallel, and the slow-switching leg comprising a slow-switching upper switch and a slow-switching lower switch, and
a control unit, configured to receive an AC voltage with a phase angle, and the control unit comprising:
a current detection loop, configured to receive the phase angle,
a voltage detection loop, configured to receive the phase angle, and
a control loop, coupled to the current detection loop and the voltage detection loop, and the control loop configured to generate a first control signal assembly with complementary levels to respectively control the fast-switching upper switch and the fast-switching lower switch, and generate a second control signal assembly with complementary levels to respectively control the slow-switching upper switch and the slow-switching lower switch,
wherein the control loop controls the second control signal assembly to follow the phase angle, and dynamically adjusts a duty cycle of the second control signal assembly to respectively turn on or turn off the slow-switching upper switch and the slow-switching lower switch.