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Mitsubishi Electric corporation, Kita Itami Works ABS"RACT Semiconductor-applied Power Electronics ( SPE 1, which is divided into two; micro-power and macro-power electroiiics, i s defined as a systems technology which i s i n t e r s t i t i a l to a l l four major disciplines of electrical engineering; power / energy systems engineering, solid-state electronic devices and circuit system engineering, analog digital control and instrumentation systems theory and their applied engineering, and computer hardware & software engineering. SPE Mainly deals with Multi-diverse application-oriented systems engineering and theory on analysis and design of electronics for switched-mode conversion & conditioning circuits and control processing circuits of large amounts of electrical power in the fields of u t i l i t y grid-connected power systems and new energy utilization and storage systems, and consumer and high-tech power systems.This paper describes the present status and some advanced feasibilities of high-frequency (HF) swi tched-mode power conversion & conditioning circuits and control systems in SPE applications.The future trends and new conceptional prospects in next generation SPE are discussed fron a practical systems engineering point of view.