Soft-switching Converter for Inductive Power Transfer System with Double-sided LCC Resonant Network
Soft-switching Converter for Inductive Power Transfer System with Double-sided LCC Resonant Network
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发表时间：
2022-09
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通讯作者：
Ryohei Okada;Ryosuke Ota;N. Hoshi
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作者：
Ryohei Okada;Ryosuke Ota;N. Hoshi
在感应功率传输(IPT)系统的一般软开关方法中，有意在谐振网络中产生无功电流，然后利用该电流来实现软开关。然而，由于无功电流在系统中循环，整个系统的效率变差。针对这一问题，提出了软开关有源电桥(SAB)逆变器。SAB变流器由全桥有源变流器和LC电路组成，可以代替谐振网络产生无功电流。结果，减少了系统中循环的无功电流，并且可以获得高效率。本文介绍了如何将SAB转换器应用于具有双面LCC拓扑的IPT系统。理论分析阐明了LC电路的设计对整个系统效率的影响，并讨论了LC电路的设计原则。通过实验验证了理论分析结果和设计指导思想的正确性。理论分析结果表明，SAB-IPT系统可以在较宽的工作范围内获得较高的效率。其中，2.5kW的效率提高了0.69个百分点，1.5kW的效率提高了0.88个百分点。
In a general soft switching method for inductive power transfer (IPT) systems, a reactive current is intentionally generated in the resonant network and then utilized to achieve soft switching. However, the whole-system efficiency worsens because the reactive current circulates in the system. Against this problem, the soft-switching active bridge (SAB) converter is proposed. The SAB converter comprises the full-bridge active converter and the LC circuit, which can generate the reactive current in place of the resonant network. As a result, the reactive current circulating in the system is reduced, and high efficiency can be achieved. This paper shows how to apply the SAB converter to IPT systems with the double-sided LCC topology. The theoretical analysis clarifies the effect of the design of the LC circuit on the whole-system efficiency, and the design guideline for the LC circuit is discussed. In the experiment, the validities of the theoretical analysis result and the design guideline are shown. The SAB-IPT system can get higher efficiency over wide operation range as well as the theoretical analysis result. Especially, the efficiency at 2.5 kW-output is improved by 0.69 points, and the efficiency at 1.5 kW-output is improved by 0.88 points.