In this article, a single-stage ac–dc based on the dual active bridge with natural power factor correction is proposed. A modulation strategy and a control technique have been given to achieve the unity power factor of the ac side without inner current tracking loops and lookup tables. A notch filter is used in the output voltage feedback path to reduce the influence from the low-frequency output-voltage ripple to the regulator. All of the input-side power devices can achieve zero voltage switching (ZVS) on and all of the output-side power devices can achieve ZVS under certain load conditions with the proposed control strategy. The ZVS conditions and parameter design are given in this article. A 1.4-kW prototype has been fabricated to verify the effectiveness of the proposed converter and control strategy.

中文翻译：

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基于双有源桥DC-DC转换器的单级自然功率因数校正器，无内部电流跟踪环路

在本文中，提出了一种基于具有自然功率因数校正的双有源电桥的单级 ac-dc。已经给出了一种调制策略和控制技术，以在没有内部电流跟踪回路和查找表的情况下实现交流侧的单位功率因数。在输出电压反馈路径中使用陷波滤波器以减少低频输出电压纹波对稳压器的影响。通过所提出的控制策略，在一定负载条件下，所有输入侧功率器件都可以实现零电压开关（ZVS），并且所有输出侧功率器件都可以实现 ZVS。本文给出了 ZVS 条件和参数设计。已经制造了一个 1.4 千瓦的原型来验证所提出的转换器和控制策略的有效性。