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首页> 外文期刊>Power Electronics, IET >Three-phase ripple free DCM boost converter with low THD
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Three-phase ripple free DCM boost converter with low THD

机译：具有低THD的三相无纹波DCM升压转换器

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摘要

High total harmonic distortion (THD) and ripple of input current are the two main disadvantages of a single switch discontinuous current mode boost power factor correction (PFC) converter. In this study, THD and input current ripple of conventional DCM boost converter are improved. Reduction of input current THD is achieved by reducing the discharge time of input inductors using magnetic switch concept. Input inductors currents are discharged with a voltage equal to twice of output voltage instead of the output voltage. Also, high input current ripple in discontinuous conduction mode (DCM) operation is solved by using an additional input inductor-capacitor (LC) filter in the conventional converter. This will result in extra weight and volume of the converter. To eliminate the required additional inductors for implementation of the mentioned input LC filter, a ripple cancellation cell using coupled inductors is used and by adjusting mutual inductance in a proper manner, very low input current ripple is achieved. Results from a 400 W prototype converter are presented. Input current THD is below 8% for a wide range of input voltage. Furthermore, the efficiency of the proposed converter is compared with conventional DCM boost PFC converter under the same input current THD. Although the proposed converter applies two switches, the total switching and conduction losses are reduced considerably.
机译：高总谐波失真（THD）和输入电流纹波是单开关不连续电流模式升压功率因数校正（PFC）转换器的两个主要缺点。在这项研究中，改进了传统DCM升压转换器的THD和输入电流纹波。通过使用磁性开关概念减少输入电感器的放电时间，可以降低输入电流THD。输入电感器电流以等于输出电压（而不是输出电压）两倍的电压放电。同样，通过在常规转换器中使用附加的输入电感器电容器（LC）滤波器，可以解决不连续传导模式（DCM）操作中的高输入电流纹波。这将导致转换器的额外重量和体积。为了消除实现上述输入LC滤波器所需的额外电感器，使用了使用耦合电感器的纹波消除单元，并且通过以适当的方式调节互感系数，可以实现非常低的输入电流纹波。给出了400 W原型转换器的结果。对于广泛的输入电压，输入电流THD低于8％。此外，在相同的输入电流THD下，将建议的转换器的效率与传统的DCM升压PFC转换器进行了比较。尽管建议的转换器使用两个开关，但是总开关损耗和传导损耗却大大降低了。

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