A MHz High Voltage Gain PV Micro-converter Featuring Extended ZVS operation and Continuous Input Current With Coupled Magnetics

2021 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2021-06-14 DOI:10.1109/APEC42165.2021.9487150

Samira Ahmadiankalati, Kajanan Kanathipan, J. Lam

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Abstract

A MHz DC/DC micro converter with extended zero voltage switching turn-on and step-up voltage capability for PV energy applications is presented. The proposed converter consists of a boost converter integrated with a CL parallel resonant converter. An auxiliary circuit is employed to achieve soft-switching operation at all conditions, and its inductor is coupled with the boost inductor to reduce the size and weight of the overall system. This in turn, allows for duty cycle based maximum power extraction control to be applied to the boost switch. The operating frequency of the converter’s switches are on the order of mega-hertz to further decrease the size and cost of passive components. Theoretical analysis and the operating principles of the proposed converter is provided. Simulation results on a 1.06MHz, 200W and 380V-output converter are presented to highlight the merits of the proposed topology. Experimental results are provided on a proof of concept prototype to highlight the features of the circuit.

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一种MHz高电压增益PV微转换器，具有扩展ZVS操作和连续输入电流与耦合磁

提出了一种用于光伏能源应用的具有扩展零电压开关通断和升压能力的MHz DC/DC微型变换器。该变换器由一个升压变换器和一个CL并联谐振变换器组成。采用辅助电路实现各种条件下的软开关操作，其电感与升压电感耦合，减小了整个系统的尺寸和重量。这反过来又允许基于占空比的最大功率提取控制应用于升压开关。转换器开关的工作频率在兆赫数量级，以进一步减小无源元件的尺寸和成本。对该变换器进行了理论分析和工作原理分析。最后给出了一个1.06MHz、200W、380v输出的变换器的仿真结果，以突出所提出的拓扑结构的优点。实验结果提供了一个概念验证原型，以突出电路的特点。

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2021 IEEE Applied Power Electronics Conference and Exposition (APEC)

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