Abstract
Wireless power transmission (WPT) via inductive coupling is used in many applications such as biomedical implants, sensors, and radio-frequency identification (RFID). Range extension, robustness against load (R L ) variations and coil misalignments and rotations, and miniaturization of inductive links are key in such applications, demanding new architectures for the integrated power management (IPM) [1–6]. Conventional IPMs in the form of rectifiers or doublers operate in voltage mode (VM) using active synchronous switches to achieve high AC-DC power-conversion efficiency (PCE) in [1–3]. However, they suffer from limited voltage-conversion efficiency (VCE), requiring large AC carriers across the receiver (RX) LC-tank. In [4], the RX LC-tank has been shorted twice in every power carrier cycle for R L modulation. Although this approach increases PTE for small R L , it is not suitable for large R L and VCE is still less than 1. A resonant current-mode (CM) IPM has recently been presented in [5], primarily used for recharging battery-powered implants with sub-volt AC carriers. However, it requires a battery for startup and is not suitable for direct WPT. For applications that involve large coupling distance (d) and R L variations, neither VM- nor CM-only IPMs achieve highest power transmission efficiency (PTE), because VM and CM are suitable for small and large d or R L , respectively [6].
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