In the domain of electric vehicle (EV) charging applications, single-stage solutions are constantly gaining prominence due to their compactness and high power density. On the other hand, increase in charger power level, naturally leads to increase in the number of phases, as the distributed power transfer allows for lower current and voltage stress on the semiconductors and passive components of each of the phases individually. In this article, a single-stage, three-phase, inductive power transfer charger for EV applications is considered. Coils of the system are based on the DD(2)Q topology. For each of the phases, a three-phase to single-phase matrix converter is employed as the interface between the grid and the inductive link. Modulation of the given converter is proposed and outlined, allowing for stable power transfer, and by that means low distortion of the grid currents and high power factor, thus complying with the required grid code. Power distribution problem caused by misalignment is discussed in-detail, and solution that equalizes power levels per phase is proposed. An experimental prototype was built and several different tests were conducted in order to verify the proposed ideas, with the power transfer of up to 24 kW and system efficiencies of up to 86.42%. The proposed modulation of the employed converter results in THD of the grid currents less than 3% and the power factor higher than 0.98.
In the domain of electric vehicle (EV) charging applications, single-stage solutions are constantly gaining prominence due to their compactness and high power density. On the other hand, increase in charger power level, naturally leads to increase in the number of phases, as the distributed power transfer allows for lower current and voltage stress on the semiconductors and passive components of each of the phases individually. In this article, a single-stage, three-phase, inductive power transfer charger for EV applications is considered. Coils of the system are based on the DD(2)Q topology. For each of the phases, a three-phase to single-phase matrix converter is employed as the interface between the grid and the inductive link. Modulation of the given converter is proposed and outlined, allowing for stable power transfer, and by that means low distortion of the grid currents and high power factor, thus complying with the required grid code. Power distribution problem caused by misalignment is discussed in-detail, and solution that equalizes power levels per phase is proposed. An experimental prototype was built and several different tests were conducted in order to verify the proposed ideas, with the power transfer of up to 24 kW and system efficiencies of up to 86.42%. The proposed modulation of the employed converter results in THD of the grid currents less than 3% and the power factor higher than 0.98. Read More
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