Introduction to Digital Power Conversion
XMC4000/1000 Family
PWM Generation
Application Guide 44 V1.0, 2015-01
4.16 Full-Bridge LLC Control – Synchronous Rectification Using HRC
The Full-Bridge LLC control by Pulse-Frequency-Modulated (PFM) and complementary PWM signal-
pairs, with individual Dead-Time Insertions, offer a tailor-made matrix of variables for an LLC
converter, including a phase adjustable synchronous rectification for alignment to the sinusoidal
current phase.
Figure 33 PWM – Full-Bridge LLC Control – Phase-Adjusted High-Resolution Rectification
Adjusting the Synchronous Rectification Phase Compliantly to the Sinusoidal Current Phase
The synchronously running timers (CC80 and CC81) may be phase-adjusted, on-the fly, in order to be
mapped optimally to the voltage switching phase and the current phase respectively. This will focus
the rectifier operation for the best efficiency, combined with the high-resolution insertion by the HRC.
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