US 12,237,770 B2
3-level buck-boost converter with flying capacitor voltage balancing circuit
Jae Soon Choi, Seoul (KR); Hak Hee Lee, Yongin-Si (KR); and Seok Mun Choi, Seoul (KR)
Assigned to SILICON MITUS, INC., Seongnam-Si (KR)
Filed by SILICON MITUS, INC., Seongnam-Si (KR); and Hangzhou Silicon-Magic Semiconductor Technology Co., Ltd., Hangzhou (CN)
Filed on Mar. 30, 2023, as Appl. No. 18/192,772.
Claims priority of application No. 10-2022-0060667 (KR), filed on May 18, 2022.
Prior Publication US 2023/0378872 A1, Nov. 23, 2023
Int. Cl. H02M 3/158 (2006.01); H02M 1/00 (2006.01); H02M 7/483 (2007.01)
CPC H02M 3/1582 (2013.01) [H02M 1/0095 (2021.05); H02M 7/4837 (2021.05)] 7 Claims
OG exemplary drawing
 
1. A 3-level buck-boost converter with a flying capacitor voltage balancing circuit, comprising:
an inductor connected in series between a switching node and a ground terminal;
an output capacitor connected between an output terminal from which an output voltage is output and a ground terminal;
a first switch connected between an input terminal to which an input voltage is input and a top plate node;
a second switch connected between the top plate node and the switching node;
a third switch connected between the switching node and a bottom plate node;
a fourth switch connected between the bottom plate node and the output terminal;
a flying capacitor connected between the top plate node and the bottom plate node;
balancing switches connected between the switching node and the balancing node;
a top balancing capacitor connected between the input terminal and the balancing node; and
a bottom balancing capacitor connected between the balancing node and the output terminal.