US 12,348,120 B2
Switched capacitor voltage converter
Wei Zhao, Shanghai (CN); and Xing Liang, Shanghai (CN)
Assigned to Southchip Semiconductor Technology (Shanghai) Co., Ltd., Shanghai (CN)
Filed by Southchip Semiconductor Technology (Shanghai) Co., Ltd., Shanghai (CN)
Filed on Nov. 8, 2022, as Appl. No. 17/982,529.
Claims priority of application No. 202111337159.9 (CN), filed on Nov. 12, 2021.
Prior Publication US 2023/0155478 A1, May 18, 2023
Int. Cl. H02M 1/088 (2006.01); H02M 1/00 (2006.01); H02M 3/07 (2006.01); H02M 3/158 (2006.01)
CPC H02M 1/0058 (2021.05) [H02M 1/088 (2013.01); H02M 3/07 (2013.01); H02M 3/1584 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A switched capacitor voltage converter, wherein the switched capacitor voltage converter is a two-branch parallel 2:1 switched capacitor voltage converter and comprises an inductive branch and two branches, wherein the two branches comprise a first branch and a second branch, and an external input voltage, upon travelling via the two branches, is converted into another voltage and output;
the inductive branch is connected between the first branch and the second branch, and switch transistors in the first branch and the second branch are primary switch transistors; and
the inductive branch is configured to transfer an electric charge or electric charges on parasitic capacitors of one branch to another branch of the two branches after all the primary switch transistors are turned off, so that a voltage difference between both terminals of each of the primary switch transistors becomes zero, and then the each of the primary switch transistors is turned on, the voltage difference between both terminals of the each of the primary switch transistors becomes zero at an instant when the each of the primary switch transistors is turned on respectively,
wherein the first branch comprises a first switch transistor, a second switch transistor, a third switch transistor, a fourth switch transistor and a first capacitor, and the second branch comprises a fifth switch transistor, a sixth switch transistor, a seventh switch transistor, an eighth switch transistor and a second capacitor;
wherein a first terminal of the first switch transistor and a first terminal of the fifth switch transistor are connected to an input terminal of the switched capacitor voltage converter, the input terminal is connected to the external input voltage, a second terminal of the first switch transistor is connected to a first terminal of the second switch transistor and a first terminal of the first capacitor, and a second terminal of the fifth switch transistor is connected to a first terminal of the sixth switch transistor and a first terminal of the second capacitor;
a second terminal of the second switch transistor is connected to a first terminal of the third switch transistor, and a second terminal of the sixth switch transistor is connected to a first terminal of the seventh switch transistor;
a second terminal of the third switch transistor is connected to a second terminal of the first capacitor and a first terminal of the fourth switch transistor, and a second terminal of the seventh switch transistor is connected to a second terminal of the second capacitor and a first terminal of the eighth switch transistor;
a second terminal of the fourth switch transistor and a second terminal of the eighth switch transistor are grounded; and
the second terminal of the second switch transistor, the first terminal of the third switch transistor, the second terminal of the sixth switch transistor and the first terminal of the seventh switch transistor are connected to an output terminal of the switched capacitor voltage converter.