US 12,438,465 B2
Buck-boost converter and hybrid control method
Bo Yang, Allen, TX (US); Xiaoyu Xi, Dallas, TX (US); and David Meng, Los Altos, CA (US)
Assigned to M3 Technology Inc., Taipei (TW)
Filed by M3 Technology Inc., Taipei (TW)
Filed on Apr. 28, 2023, as Appl. No. 18/141,156.
Application 18/141,156 is a continuation of application No. 17/094,184, filed on Nov. 10, 2020, granted, now 11,705,811.
Prior Publication US 2023/0268837 A1, Aug. 24, 2023
Int. Cl. H02M 3/158 (2006.01); H02M 1/00 (2007.01); H02M 1/08 (2006.01)
CPC H02M 3/1582 (2013.01) [H02M 1/08 (2013.01); H02M 1/0009 (2021.05)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
an on-time timer configured to determine a turn-off edge of a first gate drive signal based on comparing a first ramp signal with a first threshold voltage proportional to an output voltage of a power converter, wherein the on-time timer is configured to determine an on-time period of a high-side switch of a buck portion of a buck-boost converter;
an off-time timer configured to determine a turn-off edge of a second gate drive signal based on comparing a second ramp signal with a second threshold voltage proportional to an input voltage of the power converter, wherein the off-time timer is configured to determine an off-time period of a low-side switch of a boost portion of the buck-boost converter; and
a current mode control device having a first output for determining a turn-on edge of the first gate drive signal and a second output for determining a turn-on edge of the second gate drive signal.