US 12,107,520 B2
Driving circuit and driving method
Zhiwei Xu, Hangzhou (CN); Chiqing Fang, Hangzhou (CN); and Yunlong Han, Hangzhou (CN)
Assigned to Silergy Semiconductor Technology (Hangzhou) LTD, Hangzhou (CN)
Filed by Silergy Semiconductor Technology (Hangzhou) LTD, Zhejiang (CN)
Filed on Jun. 23, 2021, as Appl. No. 17/356,028.
Claims priority of application No. 202010616781.2 (CN), filed on Jul. 1, 2020.
Prior Publication US 2022/0006398 A1, Jan. 6, 2022
Int. Cl. H02M 3/158 (2006.01); H02M 3/155 (2006.01); H02N 2/06 (2006.01)
CPC H02N 2/06 (2013.01) [H02M 3/155 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A driving circuit for driving a piezoelectric load, the driving circuit comprising:
a) an energy-storage capacitor;
b) a first power stage circuit configured to convert an input voltage into a first voltage, and to store the first voltage in the energy-storage capacitor;
c) a second power stage circuit configured to receive the first voltage to charge the piezoelectric load during a first operation interval of an operation period, such that a power supply voltage signal provided to the piezoelectric load in the first operation interval corresponds to a reference voltage in a first interval;
d) a discharging circuit configured to discharge the piezoelectric load during a second operation interval of the operation period, such that the power supply voltage signal in the second operation interval corresponds to the reference voltage in a second interval; and
e) a switching circuit coupled between the energy-storage capacitor and the second power stage circuit, wherein during a third operation interval of the operation period, the switching circuit is configured to receive the first voltage to charge the piezoelectric load, so that the power supply voltage signal in the third operation interval corresponds to the reference voltage in a third interval.