Improving Wireless Power Transfer Efficiency with DC/DC Boost Charger by Multi-Sine Excitation at 5.8 GHz

The increasing efficiency requirements on wirelessly provided DC supply for low-power ICs, imposes the development of new design techniques for RF to DC converter coupled with commercial DC/DC chargers. Because these are typically based on DC/DC boost converter they operate as current sinks, thus imposing challenging design constraints. This paper investigates the impact of applying a multi-sine RF input signal on power transfer efficiency, involving a source-pull optimization to maximize RF to DC energy conversion and maximizing the current throughput. The paper provides experimental demonstration of 1.8 improvement with respect to conventional design at the operative frequency of 5.8 GHz, and result suitable for vehicular dedicated short-range communications.