１．Austruct

In recent years, a progress of the power semiconductor devices (below called "power devices") is significant and its fundamental performance such as switching-speed and power capacity has been improving. From this reason, the high-frequency switching technique was applied to the power conversion system. By applied this technique, enhancing control performance, noise reduction, down-sizing could be realized. On the other hand, switching-losses, dynamic electrical stress and EMI/RFI noise were increased. There were big problems which is should be solved in order to achieve high-performance and high conversion efficiency. Hence, the soft-switching technique is proposed as one of methods for solving these problems. This technique has attracted attention. Therefore, the power conversion system using this technique have been investigated. Conventional high-frequency AC link DC-DC converter using phase-shifted PWM control scheme (below called "conventional DC-DC converter") has remarkable advantages, such as lowered switching losses, simple control schemes, and reduced EMI/RFI noise. However, its had some inherent problems which must be solved, such as reduced power conversion efficiency due to significant circulating current generation. So we proposed before high-frequency AC link DC-DC converter using secondary phase-shifted PWM controls scheme (below called "proposed DC-DC converter") and its effectivity was confirmed by simulation analysis. In this paper, its open-loop and closed-loop control characteristics are estimated by means of simulation results.

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