In this article, a new bidirectional single-stage interleaved totem-pole electrolytic capacitorless ac-dc converter with high-frequency isolation and low components count is proposed. The proposed converter is constructed using nonregulating two-phase interleaved totem-pole converter switched with a fixed 50% duty on the grid side and a full-bridge on the dc-side for active power and dc output regulation. This switching method results in a ripple-free grid current regardless of the magnitude of the input inductances. Consequently, a proper design of input inductance secures soft switching for all switches under wide voltage and load ranges without an auxiliary circuit or resonant tank. Hence, the proposed topology overcomes the reverse recovery issue, thereby enabling the use of Si devices in CCM. Moreover, the current spike around the ac main zero-crossing is avoided in the CCM operation due to small rectified voltage around zero-crossing. Furthermore, the instantaneous powers at the grid side and dc-side are identical since the proposed topology is electrolytic capacitorless with inherent second harmonic ripple current at the dc-side. PFC is inherently performed in the proposed converter without a current shaping control loop, and the phase-shift angle is the only control variable. Hence, the control system is simple and reliable. A 3.3 kW prototype of the proposed converter is built and tested in order to verify the performance and the theoretical claims.

中文翻译：

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以 CCM 运行的交错图腾柱 ZVS 转换器，用于具有高频隔离的单级双向 AC-C 转换


在本文中，提出了一种具有高频隔离和低元件数量的新型双向单级交错图腾柱电解无电容交流-直流转换器。所提出的转换器采用非调节两相交错图腾柱转换器构建，该转换器在电网侧以固定的 50% 占空比进行开关，在直流侧使用全桥进行有功功率和直流输出调节。无论输入电感的大小如何，这种开关方法都会产生无纹波栅极电流。因此，正确的输入电感设计可以确保所有开关在宽电压和负载范围下实现软开关，而无需辅助电路或谐振回路。因此，所提出的拓扑克服了反向恢复问题，从而能够在 CCM 中使用硅器件。此外，由于过零附近的整流电压较小，因此在 CCM 操作中避免了交流主过零附近的电流尖峰。此外，电网侧和直流侧的瞬时功率相同，因为所提出的拓扑是无电解电容器的，并且直流侧具有固有的二次谐波纹波电流。 PFC 本质上是在所提出的转换器中执行的，没有电流整形控制环路，并且相移角是唯一的控制变量。因此，控制系统简单、可靠。构建并测试了所提议转换器的 3.3 kW 原型，以验证性能和理论主张。