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公开(公告)号：US11201557B2
公开(公告)日：2021-12-14
申请号：US16959116
申请日：2018-12-29
发明人： Qinsong Qian , Shengyou Xu , Feng Lin , Hao Wang , Wei Su , Qi Liu , Longxing Shi
摘要： 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 VDS(SR) of 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.
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2.发明授权公开(公告)号：US11081967B2
公开(公告)日：2021-08-03
申请号：US16617508
申请日：2018-09-28
申请人： SOUTHEAST UNIVERSITY
发明人： Qinsong Qian , Shengyou Xu , Qi Liu , Weifeng Sun , Shengli Lu , Longxing Shi
摘要： The invention discloses a self-adaptive synchronous rectification control system and a self-adaptive synchronous rectification control method of an active clamp flyback converter. The control system comprises a sampling and signal processing circuit, a control circuit with a microcontroller as a core and a gate driver. According to the control method, a switching-on state, an early switching-off state, a late switching-off state and an exact switching-off state of a secondary synchronous rectifier of the active clamp flyback converter can be directly detected, and the synchronous rectifier and a switching-on time of the synchronous rectifier in next cycle can be controlled according to a detection result. After several cycles of self-adaptive control, the synchronous rectifier enters the exact switching-on state, thus avoiding oscillation of an output waveform of the active clamp flyback converter.
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