US 12,334,815 B2
Multi-phase interleaved power converters with improved current balancing
Zhihua Gu, Kowloon (HK); Siu Chik Wong, Kowloon (HK); and Kim Ly Kha, Kowloon (HK)
Assigned to Astec International Limited, Kowloon (HK)
Filed by Astec International Limited, Kowloon (HK)
Filed on Jan. 17, 2023, as Appl. No. 18/155,363.
Application 18/155,363 is a continuation of application No. 16/747,262, filed on Jan. 20, 2020, granted, now 11,557,961.
Prior Publication US 2023/0155486 A1, May 18, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H02M 7/219 (2006.01); H02M 1/00 (2006.01); H02M 1/42 (2007.01)
CPC H02M 1/4233 (2013.01) [H02M 1/0032 (2021.05); H02M 7/219 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multi-phase interleaved power factor correction (PFC) converter, comprising:
at least six switches coupled in a multi-phase interleaved circuit arrangement; and
a control circuit coupled to the at least six switches, the control circuit configured to:
during a first polarity of an AC input voltage, turn on and turn off a first one of the at least six switches according to a pulse-width modulation (PWM) signal to operate the first switch as a power factor correction (PFC) active switch having an off-time as a function of a duty cycle of the PWM signal, while turning on and turning off a second one of the at least six switches as a synchronous switch;
receive one or more signals indicative of the currents in each phase of the interleaved circuit arrangement;
in response to the one or more signals indicating that the converter is operating in a continuous mode, set an on-time of the a second switch equal to the off-time of the first switch; and
in response to the one or more signals indicating that the converter is operating in a discontinuous mode, set the on-time of the second switch to a duration less than the off-time of the first switch.