For the research of wireless power transfer, loosely coupled inductive power transfer (LCIPT) is one of the widely adopted technologies. There are already various researches focusing on development of high-efficiency LCIPT. However, when the transmission and receiver coils are misaligned, the power transfer efficiency will be significantly dropped. This article considers the change of mutual inductance when two induction coils are misaligned. A fuzzy control approach to solve for this problem by adaptively adjusting operational frequency is introduced. Experiments show that it can reduce the power transferring efficiency drop by 11% when two conduction coils are misaligned up to 50 mm. This research also supports adaptive maximum power transfer using tracking mechanism. Before conducting power transmission, the system can choose G2V or V2G according to the vehicle battery capacity via handshaking communication without the need of radio frequency links. In addition, the phase shift pulsewidth modulation technique is proposed for simultaneous data transmission enabling binary quadrature amplitude modulation for digital signal transmission. Fast over current protection is incorporated for power transfer safety when current overload happens. The transmission frequency of this article is controlled to meet the frequency specified by SAE TIR J2954.

Implementation of a multifunctional contactless bidirectional charging and discharging system with the aid of giant magnetoresistance (GMR) effect for car parking guidance is proposed. Traditional Hall effect sensors can detect magnetic flux changes. However, if the changes are not significant enough to induce detectable interference voltage, there will be error detection. To remedy, a GMR sensor may detect tiny changes in the magnetic field which will produce a larger change in resistance; this resistance is less susceptible to external noise influence while generating a relatively stable signal level. As a novel application, our research task combines a GMR sensor, a flexible magnetic stripe constituted by GMRs, a microprocessor and a wireless inductive power/data transfer module to realize a positioning control system for the parking lot's micro grid. Real-world experiments are conducted to verify the proposed approach.

Transmission delay time can be neglected on traditional large-scale electricity system. However it is a serious issue in distributed power grid (DPG) system. In DPG system, electricity is propagated through highly related transmission line network and the impact of transmission delay will be amplified. This highly interconnected attribute will not only cause the power system less efficient but also make whole system unstable. Aimed at solving the above difficulty, we generate a matrix sign function. This method is good for multi-state, input delay DPG system. Using the proposed matrix sign function, a lagging and time discrete system with multiple lagging is turned up to an uninterrupted time system with multiple time lagging. We also provide a discrete time model to demonstrate how compelling of our new method.

This invention proposes a novel light emitting diode (LED) lighting (dimmable) control scheme to transmit digital data through a magnetic field generated by a flyback driver that utilizes digitized data to adjust the brightness of LEDs for potential applications. This design would eliminate the cost of establishing wireless transmission hardware by simply relying on the magnetic field for communication to meet the management of the lighting control system. The method used a frequency-shift keying (FSK) technique on the secondary side of the system to send digitized data to the primary side. The primary side of the system interpreted the control commands by detecting the frequency change, and the corresponding lighting control was decoded. The inner communication connected the primary and secondary sides to the transformer through wirelessly transmitted data, which eliminated the requirements of optical coupling and peripheral circuits. For extended applications, the designed system can be combined with sensors at home for lighting management with the benefits of energy saving and potential emergency warnings.

This research proposes bidirectional power and data transfer which implements electric vehicle (EV) battery charge/discharging using magnetic resonance coupling wireless power transfer (MRC‐WPT) with inner communication by binary phase‐shift keying (BPSK) technology between the primary side and the secondary side. The MRC‐WPT‐BPSK can implement grid‐to‐vehicle, vehicle‐to‐grid, or vehicle‐to‐load (V2L) functions due to inner communication capability without additional wireless communication modules such as Wi‐Fi, Bluetooth, ZigBee, and so on. In the experiment result, charging power up to 300 W can reach an efficiency of 85%. The data communication accuracy (quality) of this system can be almost 100% within the air gap from 0 to 50 mm. In addition, the V2L function can provide energy up to 1000 Wh, such as emergency power, backup power, or light sources in the parking lot. Therefore, MRC‐WPT‐BPSK like a smart grid aids the user to obtain benefits from charging or discharging the battery according to time‐of‐use list.

This research is a magnetic resonance wireless charging system and focuses on the design of bidirectional power and data feedback using Binary Phase-Shift Keying (BPSK) technology. The system is designed to achieve two-way power transmission and data feedback simultaneously without additional wireless communication modules such as Wi-Fi, Bluetooth, ZigBee, etc. It can also simultaneously receive charging or discharging information from the secondary side or primary fed back to meet the modern electric vehicle charging and discharging to load (Vehicle to Load, V2L) function.