双有源桥钳位变换器的简单PWM移相控制策略

针对传统移相控制方法下双有源桥变换器会产生较大电流应力和在宽电压范围下低效率运行的问题，提出一种面向双有源桥钳位变换器的简单PWM移相控制策略。首先，利用钳位开关的运行周期和占空比取代变换器内移相比，以简化原边H桥工作过程并提高控制自由度。然后，计算了副边H桥开关管的占空比。通过分析所提出的移相控制策略的工作原理和软开关特性，推导出以传输功率标幺值为控制量的线性大信号模型。最后，采用基于TMS320F2808为控制器的实验平台进行验证。实验结果展示了简单PWM移相控制降低了变换器的电压应力和电流应力，显著提升了变换器的传输效率。

Simple PWM phase shift control strategy for a dual active bridge clamp converter

A simple PWM phase shift control strategy for a dual active bridge clamp converter is proposed to address the problems of large current stress and low transmission efficiency over a wide voltage range in the conventional phase shift control method. First, the operational period and duty cycle of the clamp switch are used instead of the inter phase shift ratio of the converter to simplify the primary H-bridge operation and improve the degrees of control freedom. Then the duty cycle of the secondary H-bridge switches is calculated. By analyzing the working principle and soft switching characteristics of the proposed phase shift control strategy, a linear large-signal model is derived with the unified transmission power per-unit value as the control quantity. Finally, an experimental platform based on TMS320F2808 as the controller is used for verification. The results demonstrate that the simple PWM phase shift control reduces the voltage stress and current stress of the converter and significantly improves its transmission efficiency. This work is supported by the National Natural Science Foundation of China (No. 61803174).