A Parameter Tuning Method for a Double-Sided Compensated IPT System With Constant-Voltage Output and Efficiency Optimization

Abstract

A parameter tuning method is critical for inductive power transfer (IPT) systems because it ensures constant output and reduces reactive power. This is especially true for the double-sided <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCC</i> (DS- <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCC</i> ) compensated IPT system due to its high parameter tuning freedom. This article proposes a parameter tuning method for the DS- <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCC</i> compensated IPT system. By reconfiguring key resonant parameters, the load-independent constant voltage (CV) output and zero phase angle (ZPA) can be achieved without varying operating frequency. Based on this, two compensation factors for the primary and secondary compensation inductances are defined, and the performance of the IPT system under different compensation factors and the optimal matching criterion of these two factors are investigated in detail. By optimizing these two compensation factors, the overall system efficiency is improved over the entire power range without affecting the property of CV and ZPA. A 2-kW experimental prototype is built to validate the practicability of the proposed tuning method. The experimental results indicate that when the dc load varies from 13.4 to 134 Ω, ZPA can always be achieved, and the output voltage fluctuation is only 4.6 V. The peak efficiency reaches 92.14% at a 1.6-kW output power.