US 12,283,882 B2
Supply voltage generating method for a driver circuit in a power system
Rui Wang, Chengdu (CN); Haishi Wang, Chengdu (CN); and Shanglin Xu, Chengdu (CN)
Assigned to Chengdu Monolithic Power Systems Co., Ltd., Sichuan (CN)
Filed by Chengdu Monolithic Power Systems Co., Ltd., Chengdu (CN)
Filed on Dec. 27, 2021, as Appl. No. 17/562,683.
Claims priority of application No. 202110032729.7 (CN), filed on Jan. 11, 2021.
Prior Publication US 2022/0224227 A1, Jul. 14, 2022
Int. Cl. H02M 3/07 (2006.01); H02M 1/08 (2006.01)
CPC H02M 3/07 (2013.01) [H02M 1/08 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A power system, the power system comprising:
a power input terminal, configured to receive an input voltage;
a system output terminal, configured to provide a system voltage;
an input transistor, having a first terminal coupled to the power input terminal, a second terminal coupled to a boost output terminal, and a control terminal;
a switching circuit, coupled between the boost output terminal and the system output terminal, wherein the switching circuit having a high side transistor coupled in series with a low side transistor, the high side transistor has a source, and the low side transistor has a drain, wherein the source of the high side transistor and the drain of the low side transistor forms a switching node, and wherein the switching circuit is configured to work in a buck mode to convert the input voltage to the system voltage, or to work in a boost mode to convert the system voltage to a boost output voltage at the boost output terminal;
a bootstrap capacitor, coupled between the switching node and a bootstrap terminal, wherein the bootstrap capacitor is configured to provide a bootstrap voltage at the bootstrap terminal;
a first power generation circuit, having a first input terminal to receive the input voltage, a second input terminal to receive the boost output voltage, a third input terminal to receive the bootstrap voltage, and an output terminal to provide a first supply voltage based on the input voltage, the boost output voltage and the bootstrap voltage; and
a first driver circuit, having a power terminal to receive the first supply voltage, a signal input terminal to receive a first control signal, and a signal output terminal to provide a first driving signal to the control terminal of the input transistor, wherein the first driving signal is generated based on the first control signal.