In this paper, an interleaved buck–boost n-phase converter with the soft-switching operation is proposed. All the switches are switched at zero voltage by applying an inductor between every two consecutive phases. These inductors cause the soft-switching operation through all switches of the converter by discharging the inherent voltage of switches’ capacitor and keeping the voltage of switch at zero until the switching period ends. Also, due to the existence of these inductors, the output diodes are disconnected during zero current. The large number of phases in this kind of converter reduces the output voltage ripple, output and input current ripple and increases the reliability of the converter. Increasing the number of phases of the converter reduces the current stress on the power switches and, thereby, leads to reducing conduction losses of the power switches. This kind of converter has a high efficiency due to its soft-switching operation of switches and reduction of the conduction losses of all switches. Finally, the experimental results of a four-phase prototype of this converter with 100 W output power for input voltage 20 V and output voltage 100 V are presented for determining the features of the desired converter.

本文提出了一种具有软开关操作的交错式降压-升压n相转换器。通过在每两个连续的相位之间施加一个电感器，所有开关都在零电压下切换。这些电感器通过释放开关电容器的固有电压并使开关电压保持为零直到开关周期结束，从而通过转换器的所有开关进行软开关操作。同样，由于这些电感器的存在，输出二极管在零电流期间断开。这种转换器的大量相减少了输出电压纹波，输出和输入电流纹波，并提高了转换器的可靠性。增加转换器的相数可减少电源开关上的电流应力，从而，导致减少功率开关的传导损耗。这种转换器由于其开关的软开关操作和所有开关的导通损耗的降低而具有高效率。最后，给出了该转换器的四相原型的实验结果，其中输入电压为20 V，输出电压为100 V，输出功率为100 W，以确定所需转换器的特性。