Comprehensible wireless charging and data transfer for electric cars

Newswise – With a focus on reducing emissions and improving fuel economy, automakers are developing electric vehicles (EV) to replace fuel and diesel vehicles from 2030 to 2040. The green power supply of electric vehicles offers maximum environmental benefit, no emissions and less pollution. However, climate changes occur from time to time, which lead to a rotating reserve of electrical energy. Fortunately, a stable electrical storage system (ESS) can compensate for this problem.

Electromagnetic induction transfers energy from the source to the load across an air gap based on Faraday’s theorem, Ampere’s theorem, and Maxwell’s equation. A power pad combined with a twisted network (or compensation network) forms a resonant circuit to efficiently transmit and receive more massive energy. As a result, it can perform tremendously with a higher efficiency of up to 90%, a quality factor of 5 ~ 100, a coupling factor of 0.2 ~ 0.5, and a basic operating frequency range of hundreds of Hz to several 100 kHz over an acceptable one Air gap. These achievements are due to high frequency semiconducting switching components with less power loss, and a matched compensation network can compensate for power transmission loss due to lateral misalignment between coils. In addition, high quality power pads can provide higher magnetic flux to overcome the limitation of the air gap.

A static battery charging system with a heavy electrical storage system will definitely give the vehicle a longer drive. However, the heavy electrical storage system will put a load on the vehicle and cause more environmental pollution. In contrast, a dynamic battery charging system can reduce the size and weight of the vehicle battery while increasing the driving efficiency of the vehicle. However, the system has to integrate various infrastructures such as the widely used battery charging stations.

Adaptive compensation of the magnetic-inductive system (ACMIS), based on a zero voltage switch (ZVS) that transfers electrical power from a single-end inverter, combined with a compensated network of the parallel-to-parallel (PP) type and a self-tuning impedance from LC Tank is presented in this book. The topic of simultaneous power and data communication is covered. The coherent wireless data transmission scheme includes handshake communication, a current balancing mechanism, and a data-linked scheme that synchronizes with the flow of current via a magnetic connection. The advantages are low cost and RF radiation and interference. In addition, it simultaneously transmits real-time feedback of the message from the load side. The experiment for a multifunctional contactless power flow of the G2V mode and bidirectional external communication and internal communication with giant magnetoresistance effect (GMR) for parking guidance is presented. The experiment analyzes the data transmission performance including the current trimming method and the data-bound method in order to evaluate the data transmission quality according to the varying lateral offset, the output power and an air gap between two inductive power pads.

About the author:

Chih-Cheng Huang was born in 1970 in Taichung, Taiwan. He received an MS in Electrical Engineering from National Chung Hsing University, Taichung, Taiwan in 2012 and a Ph.D. Graduated from the same university in 2017. He is currently working as an Assistant Researcher at the Department of Electrical Engineering, National Applied Research Laboratories, Taiwan. His research interests include wireless energy transmission, communication, industrial electronics and optimization techniques in the economy and application of energy systems.

Chun-Liang Lin was born in 1958 in Tainan, Taiwan. He received the Ph.D. Graduated from National Cheng Kung University, Tainan, Taiwan, in 1991. He was Associate Professor and Professor in the Department of Automatic Control Engineering, Feng Chia University, Taichung, Taiwan from 1995 to 2003. He is currently a professor at the Department of Electrical Engineering, National Chung Hsing University, Taichung, Taiwan. His research interests include leadership and control, wireless power transmission, and biometrics with applications. In 2000, 2003 and 2010 he received three Distinguished Research Awards from the National Science Council of Taiwan.

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