Single-phase ac-dc converter for low-frequency pulse load normally requires high-capacitance electrolytic capacitors, which reduces the lifetime and may cause reliability problem. To meet the challenges of voltage ripple, this article introduces a power pulsation buffer (PPB) that smooths the output voltage and provides essential pulse power to the load simultaneously. The proposed PPB is realized by a discontinuous current mode (DCM) bidirectional buck/boost converter with real-time duty-cycle calculation (RDC) and peak voltage control. The proposed control method can relieve the capacitance requirement and achieve good dynamic response. The electrolytic capacitor is replaced with the film capacitor which has better reliability. SiC devices are adopted to further reduce the inductor volume of PPB. The core-less design is also proposed to design an integrated air-core inductor for further volume deduction. To meet the DCM requirement of PPB in various operating conditions, the phase shift between the line voltage and pulse load is taken into account. An electrolytic capacitor-less prototype with 1800-W peak power is built to verify the advantages of the proposed method.

中文翻译：

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具有SiC功率脉动缓冲器的单相AC-DC转换器，适用于脉冲负载应用

用于低频脉冲负载的单相AC-DC转换器通常需要高电容电解电容器，这会缩短使用寿命并可能引起可靠性问题。为了应对电压纹波的挑战，本文介绍了一种功率脉动缓冲器（PPB），该缓冲器可平滑输出电压并同时向负载提供必要的脉冲功率。所提出的PPB通过具有实时占空比计算（RDC）和峰值电压控制的不连续电流模式（DCM）双向降压/升压转换器来实现。所提出的控制方法可以减轻电容需求并获得良好的动态响应。用可靠性更高的薄膜电容器代替了电解电容器。采用SiC器件可进一步减小PPB的电感器体积。还提出了无芯设计来设计集成的空心电感，以进一步减小体积。为了在各种运行条件下满足PPB的DCM要求，考虑了线路电压和脉冲负载之间的相移。构建了一个无电解电容器的峰值功率为1800W的原型，以验证该方法的优点。