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A Universal Adaptive Driving Scheme for Synchronous Rectification in LLC Resonant Converters

Fig. 1. Control scheme of proposed intelligent SR driving scheme.
A universal adaptive driving scheme for a synchronous rectification (SR) is proposed as shown in Fig. 1. The drain to source voltage of the synchronous rectifier is sensed, so that the paralleled body diode conduction is detected. Using the proposed SR driving scheme, the SR turn-off time is tuned to eliminate the body diode conduction as illustrated in Fig. 2. The SR gate driving signal can be tuned within all operating frequency regions. Compared to analog ones, it enables more intelligent and precise SR control, improving converter efficiency.

Fig. 2. SR tuning process by sensing drain-to-source voltage.
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