This article presents average modeling of a dual-half-bridge (DHB) dc–dc converter operated with independent control over phase shift, the primary-side duty cycle, and the secondary-side duty cycle. All six possible working modes and their corresponding power transfer characteristics are derived. State-space average models of the working modes are developed, and a corresponding closed-loop control scheme is proposed to regulate the power flow and lower/upper arm voltage split at both sides of the transformer independently. In addition, a transformer minimum rms current operation rule is presented. Finally, experimental results are presented to support the theoretical analysis.

中文翻译：

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三自由度调制的双半桥转换器的平均建模

本文介绍了双半桥 (DHB) dc-dc 转换器的平均建模，该转换器在相移、初级侧占空比和次级侧占空比的独立控制下运行。导出所有六种可能的工作模式及其相应的功率传输特性。建立了工作模式的状态空间平均模型，并提出了相应的闭环控制方案，以独立调节变压器两侧的潮流和上下臂电压分流。此外，还介绍了变压器最小均方根电流操作规则。最后，给出了实验结果以支持理论分析。