https://orcid.org/0000-0003-1742-5526Design & Analysis of Wireless Power Transfer for
Electric Vehicle (EV) Applications
This Model includes
1) Typical wireless EV charging system.
2) General Two-coil WPT system
3) Power electronics converter and power control
4) Exposure limit boundary for an 8 kW WPT system
Wireless power transfer (WPT) using magnetic resonance is the technology which could set human free from the annoying wires.
The advances make the WPT very attractive to the electric vehicle (EV) charging applications in both stationary and dynamic charging scenarios.
A typical wireless EV charging system is shown in Fig.
It includes several stages to charge an EV wirelessly. First, the utility ac power is converted to a dc power source by an ac to dc converter with power factor correction.
Then, the dc power is converted to a high-frequency ac to drive the transmitting coil through a compensation network.
The high-frequency current in the transmitting coil generates an alternating magnetic field, which induces an ac voltage on the receiving coil.
By resonating with the secondary compensation network, the transferred power and efficiency are significantly improved. At last, the ac power is rectified to charge the battery.
L1 represents the self-inductance of the primary side transmitting coil and L2 represents the self-inductance of the receiving coil.
S1 and S2 are the apparent power goes into L1 & L2.
S3 and S4 are the apparent power provided by the power converter.
S12 and S21 represent the apparent power exchange between the two coils.
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