A Sensorless control strategy of a Single-stage fast EV battery charger based on the Voltage-type PWM Converter

Voltage-type PWM converter has been widely used in high-power bidirectional chargers due to its advantages such as flexible control, adjustable power factor, and bidirectional energy flow. However, traditional electric vehicle charger generally adopts the two-stage structure, and its rated operating point efficiency is lower than 95%, and further improvement of efficiency will significantly increase the costs. On the other hand, in order to further improve the power of electric vehicle, its voltage level is gradually developing towards a high voltage of 800V. Therefore, this paper proposes a single-stage fast electric vehicle (EV) charger based on the voltage-type PWM converter for 800V voltage level and its corresponding control strategy without DC current sensor. Finally, a set of fast EV battery charger experiment platform based on voltage-type PWM converter is built to verify the correctness of the sensorless control strategy proposed in this paper and the practicability of the single-stage fast EV battery charger structure based on the voltage-type PWM converter.