This article aims to realize an isolated dc–dc converter with high power density, high power efficiency, and low noise performance. Although a dual-active-half-bridge (DAHB) converter can achieve high efficiency, it requires input and output low-pass filters to suppress the operational ripple current and switching noise. Owing to the volume of the filters, a DAHB converter cannot be implemented with high power density. This article presents a design theory for a novel isolated bidirectional dc–dc converter with built-in filters. The proposed converter is derived from a DAHB converter and can eliminate the input and output filters via split windings and tank capacitors; the principle of elimination is based on $LC$ low-pass filter function and zero-ripple-current operation. As the number of transistors, capacitors, and magnetic cores of the proposed converter are equal to those of the DAHB converter, the application of the proposed converter allows volume reduction by eliminating the filter components at the input and output ports. Theoretical equations are derived to design a power flow control function and a filter function simultaneously. Finally, prototypes of a DAHB converter and the proposed converter are constructed for comparison. The results demonstrate that the input port noise of the proposed prototype is lower than that of the DAHB prototype by 10 dB (peak) over 1 MHz, and the proposed approach can achieve a significant improvement in efficiency.

中文翻译：

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具有内置滤波器的高功率密度隔离式双向 DC-DC 转换器的设计

本文旨在实现具有高功率密度、高功率效率和低噪声性能的隔离式 DC-DC 转换器。虽然双有源半桥 (DAHB) 转换器可以实现高效率，但它需要输入和输出低通滤波器来抑制工作纹波电流和开关噪声。由于滤波器的体积，DAHB 转换器无法实现高功率密度。本文介绍了一种具有内置滤波器的新型隔离式双向 DC-DC 转换器的设计理论。所提出的转换器源自 DAHB 转换器，可以通过分离绕组和槽路电容器消除输入和输出滤波器；消除原理基于$LC$低通滤波器功能和零纹波电流操作。随着晶体管、电容器的数量，所提出的转换器的磁芯和磁芯与 DAHB 转换器的磁芯相同，所提出的转换器的应用允许通过消除输入和输出端口的滤波器组件来减小体积。推导出理论方程同时设计潮流控制函数和滤波器函数。最后，构建 DAHB 转换器的原型和所提出的转换器以进行比较。结果表明，所提出的原型的输入端口噪声比 DAHB 原型的输入端口噪声低 10 dB（峰值）超过 1 MHz，并且所提出的方法可以实现效率的显着提高。推导出理论方程同时设计潮流控制函数和滤波器函数。最后，构建 DAHB 转换器的原型和所提出的转换器以进行比较。结果表明，所提出的原型的输入端口噪声比 DAHB 原型的输入端口噪声低 10 dB（峰值）超过 1 MHz，并且所提出的方法可以实现效率的显着提高。推导出理论方程同时设计潮流控制函数和滤波器函数。最后，构建 DAHB 转换器的原型和所提出的转换器以进行比较。结果表明，所提出的原型的输入端口噪声比 DAHB 原型的输入端口噪声低 10 dB（峰值）超过 1 MHz，并且所提出的方法可以实现效率的显着提高。