Abstract
This paper proposes a novel LCC-SP compensation topology for inductive power transfer (IPT) system and its tuning methods to enhance misalignment tolerance. The impedance condition and the constant current output characteristic of the newly proposed topology are analyzed, followed by a detailed derivation of compensation parameters based on the discussion about resonant tank. The realization of zero voltage switching (ZVS) and reactive power demand are discussed by theoretical deduction and numerical simulation. Then, the parameters detuning method to enhance misalignment tolerance is presented and it is found that a stable output current is maintained over a wide misalignment. Compared to traditional compensation topologies, the newly proposed compensation topology provides the advantages of easy achievement of ZVS, high design freedom and high misalignment tolerance. Finally, the IPT prototype with the LCC-SP compensation network is built and tested. The experimental results match well with the calculations, validating the correctness of theoretical analysis.
Highlights
Inductive power transfer (IPT) systems with advantages of isolation, convenience and safety features, have attracted considerable attention in last several years, such as highpower applications including batteries charging of electric vehicles (EVs) [1]-[3] and low-power applications including mobile devices [4] and implanted implants [5], [6]
A typical IPT system consists of several stages: a high frequency inverter (HFI), a magnetic couplers, compensation networks on both sides and a rectifier circuitry for dc charging
Compensation topology is essential for its determination of resonant frequency, power factor, output characteristics to achieve higher system efficiency, power density, and reliability
Summary
Inductive power transfer (IPT) systems with advantages of isolation, convenience and safety features, have attracted considerable attention in last several years, such as highpower applications including batteries charging of electric vehicles (EVs) [1]-[3] and low-power applications including mobile devices [4] and implanted implants [5], [6]. LCL compensation topology has the design freedom to realize load-independent constant output current (CCO) and input ZPA simultaneously, the compensation inductance should be equal to the self-inductance of coupling coil, which is usually quite large to transfer more power. This prominent problem leads to large power dissipation and relatively low system efficiency. The aforementioned literatures mainly focuses on maintaining voltage output, the stable output of IPT system is more desirably a current source in some applications, such as constant-current charging stage of EVs. From the perspective of excellent CCO demand and smoothing the transmission power fluctuation, a novel LCCSP compensation topology and the parameters optimization methods are proposed.
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