US 12,283,883 B2
Series-parallel 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. 10, 2022, as Appl. No. 17/985,029.
Claims priority of application No. 202111337088.2 (CN), filed on Nov. 12, 2021.
Prior Publication US 2023/0155492 A1, May 18, 2023
Int. Cl. H02M 3/07 (2006.01); H02M 1/00 (2007.01); H02M 1/08 (2006.01)
CPC H02M 3/07 (2013.01) [H02M 1/0058 (2021.05); H02M 1/083 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A series-parallel switched capacitor voltage converter, wherein the series-parallel switched capacitor voltage converter is a series-parallel 3:1 switched capacitor voltage converter and comprises an inductive branch and two branches, and the two branches comprise a first branch and a second branch, and an 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 a parasitic capacitor of one branch to another branch of the two branches after all the primary switch transistors are turned off;
the first branch comprises a first switch transistor, a second switch transistor, a third switch transistor, a fourth switch transistor, a fifth switch transistor, a sixth switch transistor, a seventh switch transistor, a first capacitor and a second capacitor, and the second branch comprises an eighth switch transistor, a ninth switch transistor, a tenth switch transistor, an eleventh switch transistor, a twelfth switch transistor, a thirteenth switch transistor, a fourteenth switch transistor, a third capacitor and a fourth capacitor;
a first terminal of the first switch transistor and a first terminal of the eighth switch transistor are connected to an input terminal of the series-parallel switched capacitor voltage converter, and the input terminal is connected to an 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 eighth switch transistor is connected to a first terminal of the ninth switch transistor and a first terminal of the third capacitor;
a second terminal of the first capacitor is connected to a first terminal of the third switch transistor and a first terminal of the fourth switch transistor, and a second terminal of the third capacitor is connected to a first terminal of the tenth switch transistor and a first terminal of the eleventh switch transistor;
a second terminal of the third switch transistor and a second terminal of the tenth switch transistor are grounded, a second terminal of the fourth switch transistor is connected to a first terminal of the fifth switch transistor and a first terminal of the second capacitor, and a second terminal of the eleventh switch transistor is connected to a first terminal of the twelfth switch transistor and a first terminal of the fourth capacitor;
a second terminal of the second capacitor is connected to a first terminal of the sixth switch transistor and a first terminal of the seventh switch transistor, and a second terminal of the fourth capacitor is connected to a first terminal of the thirteenth switch transistor and a first terminal of the fourteenth switch transistor;
a second terminal of the sixth switch transistor and a second terminal of the thirteenth switch transistor are grounded; and
a second terminal of the second switch transistor, a second terminal of the fifth switch transistor, a second terminal of the seventh switch transistor, a second terminal of the ninth switch transistor, a second terminal of the twelfth switch transistor and a second terminal of the fourteenth switch transistor are connected to an output terminal of the series-parallel switched capacitor voltage converter.