US 12,088,189 B2
Zero-crossing state detection device for converter
Xiaohui Wu, Shanghai (CN); and Lilong Wang, Shanghai (CN)
Assigned to Shanghai Hanmai Electronic Technology Co., Ltd, Shanghai (CN)
Filed by Shanghai Hanmai Electronic Technology Co., Ltd, Shanghai (CN)
Filed on Jan. 17, 2023, as Appl. No. 18/098,067.
Claims priority of application No. 202210081780.1 (CN), filed on Jan. 24, 2022.
Prior Publication US 2023/0369960 A1, Nov. 16, 2023
Int. Cl. H02M 1/08 (2006.01); H02M 1/00 (2006.01); H02M 3/158 (2006.01)
CPC H02M 1/083 (2013.01) [H02M 1/0009 (2021.05); H02M 3/158 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A zero-crossing state detection device for a converter, the converter comprising a first type of power switch electrically coupled between an input terminal and a switch node, a second type of power switch electrically coupled between the switch node and a ground terminal, and an inductor electrically coupled between the switch node and an output terminal, the zero-crossing state detection device comprising:
a zero-crossing state indication circuit configured to generate an indication signal indicating a zero-crossing state of an inductor current flowing through the inductor, according to a first driving signal and a second driving signal respectively applied to the first type of power switch and the second type of power switch, based on a voltage at the switch node after the second type of power switch is turned off and before the first type of power switch is turned on; wherein the zero-crossing state indication circuit is configured to:
generate a first indication signal indicating that an event of the inductor current being less than zero occurs if the voltage at the switch node is a first preset value; and
generate a second indication signal indicating that the event of the inductor current being less than zero has not occurred if the voltage at the switch node is a second preset value.