The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 14, 2021
Filed:
Dec. 29, 2018
Csmc Technologies Fab2 Co., Ltd., Jiangsu, CN;
Southeast University, Jiangsu, CN;
Qinsong Qian, Wuxi, CN;
Shengyou Xu, Wuxi, CN;
Feng Lin, Wuxi, CN;
Hao Wang, Wuxi, CN;
Wei Su, Wuxi, CN;
Qi Liu, Wuxi, CN;
Longxing Shi, Wuxi, CN;
CSMC TECHNOLOGIES FAB2 CO, LTD., Jiangsu, CN;
SOUTHEAST UNIVERSITY, Jiangsu, CN;
Abstract
A control system for synchronous rectifying transistor of LLC converter, the system comprising a voltage sampling circuit, a high-pass filtering circuit, a PI compensation and effective value detection circuit, and a control system taking a microcontroller (MCU) as a core. When the LLC converter is operating at a high frequency, a drain-source voltage Vof the synchronous rectifying transistor delivers, via the sampling circuit, a change signal of the drain-source voltage during turn-off into the high-pass filtering circuit and the PI compensation and effective value detection circuit to obtain an effective value amplification signal of a drain-source voltage oscillation signal caused by parasitic parameters, and the current value is compared with a previously collected value via a control circuit taking a microcontroller (MCU) as a core, so as to change a turning-on time of the synchronous rectifying transistor in the next period.