Abstract
Tunable Self-Oscillating Switching (TSOS) methods are a robust solution for tuning of Inductive Power Transfer (IPT) systems. However, they require deep analysis to be an appropriate choice for Dynamic Wireless Charging (DWC) systems. In this paper, the optimal operation point of TSOS in the maximum power transfer, efficiency, and Zero Voltage Switching (ZVS) realization perspectives are determined based on sensitivity analysis for DWC of Electric Vehicles (EVs). In the sensitivity analysis, all the possible states of the coupling factor and state of charge (SOC) are considered as system variables. Moreover, a new phasor modeling for constant voltage (battery) loads is proposed. The performance of this model is quite different from the conventional static model for the loads. Moreover, to limit the current of the charger under light couplings, a simple hysteresis controller is employed. A setpoint is proposed based on the sensitivity analysis method to transfer maximum energy in misaligned conditions. The proposed setpoint increases transferred energy and energy efficiency while limits the current of the charger. To analyze this method, simulation is done in the Simulink/MATLAB, and to verify the results, a laboratory prototype is implemented.
Highlights
The wireless power transfer (WPT), which enables electric power transferring from the transmitter to the receiver over a large air gap, is developing rapidly [1]–[5]
In this paper, Tunable Self-Oscillating Switching (TSOS) is investigated for dynamic wireless charging (DWC) of electric vehicles (EVs)
A resonant half-bridge inverter with series-series compensator and unequal double D (UDD) coil is used as the charger
Summary
The wireless power transfer (WPT), which enables electric power transferring from the transmitter to the receiver over a large air gap, is developing rapidly [1]–[5]. In WPT, the power transfer coupler can be completely sealed, because no direct connection is needed. This provides protection against intrusion, dust, water, snow, and chemicals and makes it suitable for power supply applications in the harsh environment [6], [7]. In addition to electric shock risks reduction and ease of use for the disabled or the elderly, WPT makes it possible to charge EVs on the go, which is called dynamic wireless charging (DWC) [9]–[11]. With DWC realization, the range anxiety problem could be eliminated [12], [13]
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