US 12,456,913 B2
Resonant switched capacitor voltage converter and control method thereof
Kuo-Chi Liu, Hsinchu (TW); Ta-Yung Yang, Taoyuan (TW); Wei-Hsu Chang, Hsinchu (TW); and Chao-Chi Chen, New Taipei (TW)
Assigned to RICHTEK TECHNOLOGY CORPORATION, Zhubei (TW)
Filed by Richtek Technology Corporation, Zhubei (TW)
Filed on Aug. 14, 2023, as Appl. No. 18/449,182.
Claims priority of provisional application 63/374,141, filed on Aug. 31, 2022.
Claims priority of application No. 112101231 (TW), filed on Jan. 11, 2023.
Prior Publication US 2024/0072633 A1, Feb. 29, 2024
Int. Cl. H02M 3/07 (2006.01); H02M 1/00 (2006.01)
CPC H02M 1/0058 (2021.05) [H02M 1/0009 (2021.05); H02M 3/07 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A resonant switched capacitor voltage converter (first RSCC), which is configured to be coupled to at least another RSCC (second RSCC) and operate in synchronization with the second RSCC, to convert an input voltage to an output voltage; the first RSCC comprising:
a plurality of switches, which constitute a switching circuit, wherein the switching circuit is configured to operably receive the input voltage;
a resonant inductor, which is coupled to the switching circuit;
a resonant capacitor, which is coupled to the switching circuit; and
a control circuit, which is configured to operably generate a plurality of switching signals, to correspondingly control the plurality of switches in the switching circuit, so that the resonant capacitor and the resonant inductor are connected in series to each other, to perform resonant operation during a switching period, thus converting the input voltage to the output voltage;
wherein the control circuit is configured to operably generate a zero current signal and a first synchronization signal when a resonant inductor current flowing through the resonant inductor is zero;
wherein the control circuit is configured to operably turn off at least one corresponding switch according to the zero current signal;
wherein the first synchronization signal is configured to be inputted into the second RSCC;
wherein the control circuit is configured to operably turn on the at least one corresponding switch according to the zero current signal and a second synchronization signal, so that the first RSCC operates in synchronization with the second RSCC.