Abstract
In order to compensate the large leakage inductance and improve the power transmission capacity, capacitors are widely used in inductive power transfer (IPT) systems, which results in high voltage or current stresses in the resonant tanks and limits higher volt-ampere (VA) rating of the transfer power, especially in medium and low frequency applications. This paper presents a symmetrical half-bridge resonant converter (SHRC) for series-series/series compensated IPT systems with detailed analysis and design. It operates at a relatively low frequency of 12.5 kHz, suitable for IGBT applications. The theoretical analysis shows that, compared with full-bridge resonant converter (FRC) for IPT, the symmetrical half-bridge resonant converter achieves a higher efficiency. Simulation and a prototype of 1500 W power output were built to verify the theoretical analysis. The experimental results show that the power loss of SHRC is 39.7 W while that of FRC is 79.4 W, which is consistent with the theoretical analysis. The global efficiency of the IPT based on the proposed converter is 91.6%.
Highlights
Inductive power transfer (IPT) systems transfer electric power across an air gap by magnetic coupling and produces comparative advantages over transfer with physical contact
The reasons are probably related to the following issues of the half-bridge main factor limiting the power capacity of the inductive power transfer (IPT) system is the high voltage stresses of the topology: Poor controllability, power voltage imbalance theoperating two capacitors
It is shown that the symmetrical half-bridge resonant converter (SHRC) IPT system is more efficient than full-bridge resonant converter (FRC) IPT system under these conditions
Summary
Inductive power transfer (IPT) systems transfer electric power across an air gap by magnetic coupling and produces comparative advantages over transfer with physical contact. In order reduce the presented to avoid instantaneous changes in the voltagescoefficient of the inverter andto was proved to be size of the inductors in LCL, LCC was proposed in [22], which had high misalignment tolerance suitable under variations of load and coupling coefficient [21]. An efficient double-sided LCC for IPT system was proposed in [23], and the dead time optimization additional capacitors and/or inductors. The reasons are probably related to the following issues of the half-bridge main factor limiting the power capacity of the IPT system is the high voltage stresses of the topology: Poor controllability, power voltage imbalance theoperating two capacitors.
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