Design, analysis and application of smart wireless power transfer

Abstract

Recently, electromagnetic resonant coupling significantly promotes the progress of wireless power transfer (WPT) technology and offers various competitive advantages of larger capacity, higher efficiency, better flexibility, and stronger security. Besides the applications of wireless charging, the exploration of smart WPT and its emerging technologies will promisingly incubate some novel concepts and attractive advances in domestic, industrial and medical fields. This study mainly focuses on some research highlights in technology, application, information and energy market. Therefore, a series of smart WPT schemes is studied and devised, including wireless energy encryption, wireless lighting, wireless power and drive transfer (WPDT), and wireless energy trading. The study of wireless energy encryption and modulation is to improve the energy security performance of multi-objective WPT. Its research highlights comprise four parts. First, a switched-capacitorless transmitter and two-dimensional frequency-and-duration security keys are proposed to encrypt energy packages. Second, a continuous encryption scheme is developed by using the static variable capacitor for two-dimensional chaotic energy encoding. Third, a chaotic pulse-frequency-modulated WPT system is devised and identified with good controllability, selectivity, and security. Fourth, multi-frequency energy-on-demand is conceived to nominate authorized receivers to take over the initiative of encryption and request their customized demands from a single smart transmitter. The study of wireless lighting is to offer a robust solution of flexible lighting using light-emitting diodes (LEDs), especially for the harsh environment. A scheme of wireless lighting using anti-parallel LEDs is developed, and a variable-frequency variable-power control is newly used for LED dimming. Besides, a hybrid-frequency pacing (HFP) modulation and a high-order transformed network are presented to realize the robust zero-voltage switching (ZVS). The ZVS-HFP can boost the whole-process efficiency by over 7% during power control. The study of WPDT is to define a new concept for highlighting the drive capability of wireless power. The proposed WPDT can flexibly manipulate the wireless switches, wireless converters, wireless motors and other wireless devices. Accordingly, a wireless piping network, typically an underground drainage system, is conceived with no use of controllers, power grids, and communications. With the help of magnetic resonant modulation, the WPDT using wireless switches can conduct the desired commutation for wireless motors with bidirectional motion and speed control. The study of wireless energy trading is to advance an electric vehicle (EV) power network, termed traffic energy internet. Traffic energy routers are devised to support the rapid energy transactions with (or among) EVs. The EVs can get arbitrage and earn energy interest from the traffic energy internet via energy deposit or withdrawal. The traffic energy routers can download or upload the unbalanced energy during energy trading. Also, traffic energy economics is developed to stimulate the profit-oriented activities of EVs and thus conduct the energy management of one router as well as the energy distribution of the whole internet. Finally, to evaluate and verify the proposed smart WPT systems and their emerging technologies, theoretical analyses, computational simulations and prototype experimentations are performed to provide in-depth discussions and validations for the wireless energy encryption, wireless lighting, WPDT and wireless energy trading.