Abstract
The scientific and applied problems discussed in this paper are related to the development of a wireless charging station using an inductive power transfer (IPT) module power supply with energy dosing and dynamic matching. A computer simulation and an experimental study allowed the authors to define the ranges of the parameter variation of the equivalent load and to design the best matching so that maximum energy transfer is efficiency achieved. The proposed principle of energy control provides highly reliable and a flexible charging station even with a simplified system of automatic control and fault protection. A prototype charging station is developed and built to supply an inductive power transfer system that delivers 30–35 kW power over an air gap between transmitting and receiving parts measuring 50–200 mm and with a horizontal misalignment of ±200 mm. The results showed that the system can transfer the specified electrical power with about 82–92% efficiency and that the IPT module and its dynamic matching during charging exhibited a high degree of stability under a misaligned (x-y-z) condition and battery state of charge.
Highlights
Over the last decade, almost all leading automobile companies have made research and development contributions in the field of electric vehicles (EVs)
The main conclusion is that this method is not suitable for loads with highly including inductive power transfer (IPT) systems for EV charging, because it increases the switching losses of transistors, causes variable parameters, including IPT systems for EV charging, because it increases the switching losses highly distorted form of current through the IPT coils, and works in inappropriate operating modes of transistors, causes highly distorted form of current through the IPT coils, and works in with decreased efficiency
This requires the use of additional measures for dynamic matching at different x-y-z coils positions; in case of magnetic coupling change, T equivalent circuit inductances change over a wider range than in the equivalent circuit with two inductances; at k values in the range 0.2 < k < 0.6, relative change of ∆LN1 (k)/∆LL1 (k) is about 1.68
Summary
Almost all leading automobile companies have made research and development contributions in the field of electric vehicles (EVs). Major additional control of matching could be affected by means of and/or dynamic correction of matching setup by changing of resonant capacitors value. The main conclusion is that this method is not suitable for loads with highly including IPT systems for EV charging, because it increases the switching losses of transistors, causes variable parameters, including IPT systems for EV charging, because it increases the switching losses highly distorted form of current through the IPT coils, and works in inappropriate operating modes of transistors, causes highly distorted form of current through the IPT coils, and works in with decreased efficiency. It is appropriate to change the matching capacitor value in transmitting transmitting using electronic switches. This allows for an adjustment of the matching circuit during using electronic switches.
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