Abstract
Owing to its relatively high efficiency, extended transmission range, and less exposure to radio frequency radiation, near-field resonant wireless power transfer (R-WPT) has been widely used in consumer electronics and bio-implants. For most applications, a well-regulated output voltage is required against the coupling and loading variations, and thus a regulation scheme should be employed in an R-WPT system. To achieve an optimal receiver (RX) or overall efficiency, together with a reduced cost overhead, several regulation schemes have been proposed in recent years, where the regulation can be implemented at either the RX or transmitter (TX) side, or both. These regulation schemes have been reviewed and comprehensively discussed in this paper. Hence, the main contribution of this paper is to provide a guideline for designing the regulation scheme in R-WPT systems. Moreover, potential new topologies of regulation are investigated here.
Highlights
The wireless power transfer (WPT) technique is at the critical point of explosive growth.Many consumer electronics and bio-implant systems have integrated WPT circuits for their compactness, being water-proof, and their reduced maintenance cost
An LDO cascading the rectifier can provide precise regulation while keeping a small voltage ripple compared to a direct current (DC)–DC converter
The rectifier is working in Discontinuous Conduction Mode (DCM) similar to a DC–DC converter
Summary
The wireless power transfer (WPT) technique is at the critical point of explosive growth. Among the near-field WPT techniques, resonant WPT (R-WPT) has gradually drawn widespread attention This is because the R-WPT technique can extend the power transfer range to several tens of centimeters, which is much wider than that of the inductive coupling technique. TX regulation can be achieved by PA supply voltage control [32,33], resonant frequency control [34], PA power switch duty cycle control [35,36,37,38,39,40], and vector power summing control [41,42].
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