Digitally controlled synchronous bridge-rectifier for wireless power receivers

Reducing power loss in wireless power receivers is important to avoid thermal design issues. Synchronous rectification is a suitable means for loss reduction. In this paper we propose a synchronous rectifier with a simple control scheme. A detailed analysis leads to a time-domain model which is used to perform a power loss analysis. Experimental verification shows that the predicted efficiency improvement agrees with measurement results.

[1]  Peter Wambsganss,et al.  Inductive power transmission system with stabilized output voltage using local primary-and secondary-side control , 2010, Proceedings of 14th International Power Electronics and Motion Control Conference EPE-PEMC 2010.

[2]  Maysam Ghovanloo,et al.  An Integrated Power-Efficient Active Rectifier With Offset-Controlled High Speed Comparators for Inductively Powered Applications , 2011, IEEE Transactions on Circuits and Systems I: Regular Papers.

[3]  Yang Sun,et al.  A high speed comparator based active rectifier for wireless power transfer systems , 2011, 2011 IEEE MTT-S International Microwave Workshop Series on Intelligent Radio for Future Personal Terminals.

[4]  Horst Wupper.  Analyse elektronischer Schaltungen , 1996 .