US 12,470,133 B2
Conversion circuit with a capacitor module, balancing module and a startup module and related electronic device
Haitao Chen, Shenzhen (CN); and Xingzhong Zhang, Dongguan (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Jan. 20, 2023, as Appl. No. 18/157,270.
Application 18/157,270 is a continuation of application No. PCT/CN2020/105423, filed on Jul. 29, 2020.
Prior Publication US 2023/0155488 A1, May 18, 2023
Int. Cl. H02M 3/00 (2006.01); H02M 1/00 (2007.01); H02M 1/36 (2007.01); H02M 3/07 (2006.01)
CPC H02M 3/01 (2021.05) [H02M 1/008 (2021.05); H02M 1/36 (2013.01); H02M 3/07 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A conversion circuit comprising:
a capacitor module, wherein the capacitor module comprises at least a first capacitor and a second capacitor;
a balancing module, wherein the balancing module comprises at least a first resonant circuit; and
a startup module, wherein the startup module comprises a direct current-direct current converter separately coupled to both ends of a target capacitor, the first resonant circuit comprises at least two groups of switches connected in parallel to each other and a first resonant cavity connected between the two groups of switches, the first capacitor is connected in series to the second capacitor, and the first capacitor is connected in parallel to the target capacitor, the first resonant circuit is separately connected to both ends of the target capacitor and the second capacitor, the balancing module is configured to balance voltages at both ends of the first capacitor and the second capacitor by controlling the switches in the first resonant circuit in conjunction with influence of the first resonant cavity on a current, the startup module is configured to start the balancing module and the capacitor module;
wherein one group of switches in the two groups of switches in the first resonant circuit further comprises: at least a first switch and a third switch, the other group of switches in the two groups of switches in the first resonant circuit further comprises: at least a second switch and a fourth switch, the first switch and the third switch are not simultaneously turned on, and the second switch and the fourth switch are not simultaneously turned on; and
wherein the first switch is connected in series to the third switch, and the second switch is connected in series to the fourth switch; one end of the second capacitor is connected to a first end of the second switch, and the other end of the second capacitor is separately connected to a first end of the first switch, a first end of the direct current-direct current converter, and one end of the first capacitor; a second end of the direct current-direct current converter is separately connected to one end of the target capacitor and a second end of the fourth switch; the other end of the first capacitor is connected to a third end of the direct current-direct current converter; and a fourth end of the direct current-direct current converter is separately connected to a second end of the third switch and the other end of the target capacitor.