US 11,870,346 B2
DC-DC converter
Dong Chen, Shanghai (CN); Lei Shi, Shanghai (CN); and Zhaohui Wang, Nuremberg (DE)
Assigned to HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Dec. 13, 2021, as Appl. No. 17/548,963.
Application 17/548,963 is a continuation of application No. PCT/CN2019/127191, filed on Dec. 20, 2019.
Prior Publication US 2022/0103070 A1, Mar. 31, 2022
Int. Cl. H02M 3/158 (2006.01); H02M 1/32 (2007.01); H02M 1/36 (2007.01); H02M 3/07 (2006.01)
CPC H02M 3/158 (2013.01) [H02M 1/32 (2013.01); H02M 1/36 (2013.01); H02M 3/07 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A direct current (DC)-DC converter, comprising:
a bus having a positive end, a negative end, and an intermediate node;
a first switch device having one end coupled to the positive end of the bus and another end coupled to a first intermediate node;
a second switch device having one end coupled to the first intermediate node and another end coupled to a reference end;
a third switch device having one end coupled to the reference end and another end coupled to a second intermediate node;
a fourth switch device having one end coupled to the second intermediate node and another end coupled to the negative end of the bus;
a first capacitor having one end coupled to the positive end of the bus and another end coupled to the intermediate node of the bus;
a second capacitor having one end coupled to the intermediate node of the bus and another end coupled to the negative end of the bus;
a flying capacitor having a positive end coupled to the first intermediate node and a negative end coupled to the second intermediate node; and
a protective circuit having a clamping unit and a buffering unit, wherein the first intermediate node and the second intermediate node are coupled to the intermediate node of the bus through the protective circuit.