Wireless Power Transfer: A Paradigm Shift for the Next Generation

Abstract

The first generation of wireless power transfer (WPT) standard Qi, launched in 2010, contains a wide range of transmitter and receiver designs with the aim of maximizing compatibility to attract many manufacturers to share the same standard. Such compatibility feature (i.e., interoperability) has not only attracted over 400 company members in the Wireless Power Consortium (WPC), but also facilitated a fast-growing wireless power market for a decade. The WPC is now expanding the scope of WPT applications to mid-power and high-power applications up to several kilowatts while the Society for Automobile Engineers also set the SAE standard for wireless charging of electric vehicles (EVs) up to tens of kilowatts. Without compromising compatibility, the authors share in this paper their views on the need for a paradigm shift from compatibility to optimal performance in terms of maximum energy efficiency for the entire charging process and minimum charging time. This paradigm change is imminent and important in view of the increasing power of WPT applications. Several enabling technologies essential to the paradigm shift will be addressed.

System for wireless power transfer to rotating objects with stable power transmission based on parity- time symmetry

“…We propose the half-bridge class D inverter shown in Fig. 9 as an AC power source [18,19]. Figures 10(a components, the phase difference between vin and iL1 can vary with changes in ω, making it difficult to maintain constant input power.…”

Public perception of wireless power transfer safety

“…As per Figure 1 it can be seen that due to technological and financial limitations, however, widespread applications remained primarily theoretical for decades despite his ground-breaking work. With developments in semiconductor technologies in the late 20th century, interest in WPT started to pick up again (Hui et al, 2023). These breakthroughs made it possible for WPT to be used in more effective and useful ways.…”

Novel Control Approach for Resonant Class-DE Inverters Applied in Wireless Power Transfer Systems

“…The topology consists of a DC voltage source V i ; two switches Q 1 and Q 2 ; two shunt capacitors C Q1 and C Q2 ; a resonant capacitor C res ; a resonant inductor L res ; and a load resistor R L . In addition, the input-to-output transfer function corresponding to (1) allows for controlling the load voltage and consequently the voltage gain G DE [45].…”