Loosely-coupled wireless power transfer: Physics, circuits, standards

Abstract

Loosely-coupled (LC) wireless power transfer (WPT) offers unique, next-generation improvements in user experience, and product design and innovation towards the vision of ubiquitous power, and infinite stand-by time for a wide range of consumer electronic devices. We outline the vision as it relates to today's mobile, battery-powered, hand-held, consumer electronics devices, and consider the unique capabilities of loosely-coupled (LC) WPT. We then describe the physics of the magnetically coupled resonant coil subsystem, which lies at the heart of LC WPT, discuss approaches and challenges in implementing WPT electronic circuits, and review industry progress towards timely, high-quality WPT technical standards.