Zero-Phase-Angle Load-Independent and -Adaptable Dual-Side <i>LCC</i> Inductive Wireless Power Transfer System
Tomokazu Mishima, Ching‐Ming Lai
Abstract
This paper presents a zero phase angle (ZPA) load-independent and -adaptable (LIA) high-order resonant inductive wireless power transfer (IPT) systems. By designing a ZPA frequency that makes all the mesh networks resonate at the same frequency, constant current (CC) or constant voltage (CV) output mode is achievable for the load variations with voltage / current source. In addition to the frequency-domain analysis, characteristics of the high-order IPT are investigated by a dual-side <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCC</i> (D- <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCC</i> ) resonant tanks, where the load power can be controlled over the wide range by pulse frequency modulation (PFM) / phase shift pulse width modulation (PS-PWM) hybrid controller. The PS-PWM and PFM hybrid modulation overcomes the issues of the existing power controls for load independent WPT. The performances of the proposed IPT system are evaluated by experiment of 5 kW prototype, after which the validity of the system design methodology is evaluated from the practical points of view.