An Improvement of Power Control and Transfer Efficiency in a Single-Ended Converter Driven WV2H by a new Control Scheme

Abstract

In this paper, we propose a V2H system based on a power supply voltage and resonance parameter modification method that conforms to the international standard SAE J2954. Usual two-way WPT systems for V2H consist of a bridge converter, which makes the apparatus larger and more expensive. As a result, the system has become larger and more costly. In this study, the radio V2H is composed of a single switch converter to reduce the size and cost of the system. There were two problems in the early studies. First, the transmit power varied significantly by only few % variation of circuit parameters. Thus, the operation is less robust for circuit parameter variation. Next, the transmit power changing region is not sufficient, since the transfer frequency is not kept in the allowable frequency band of the international standard. To solve these problems, we propose a wireless V2H using a bi-directional single-ended converter controlled by a power supply voltage and a resonance parameter change scheme. The system robustness become strong, and the transfer power can be changed from zero to a maximum power output of 6 kW under constant frequency by using a voltage changer. The proposed system is validated by experiments.