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Time-sharing space-voltage vector controlled inverter with new high-frequency transformer-assisted quasi-resonant DC link

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2 Author(s)
Yonemori, H. ; Dept. of Electr. & Electron. Eng., Kobe Univ., Japan ; Nakaoka, M.

A newly-improved quasi-resonant DC link (QRDCL) circuit topology operating under a commutation principle of the HF transformer-assisted zero voltage soft switching is proposed. The basic operating principle of this improved power conversion circuit (auxiliary transformer-assisted QRDCL TQRDCL) which is more suitable with the power factor correction input DC side expected in constant voltage-constant frequency (CVCF) UPS, power active filters and switched-mode PWM converters, and new energy-interfaced power supplies for utility-interactive interconnection, is presented. Its operating characteristics are discussed and evaluated in terms of computer-aided simulation results. The experimental circuit is tested and examined for CVCF/UPS systems. This tested equipment is considered for linear and nonlinear electrical loads under the conditions of large load variations and voltage fluctuations from a practical point of view

Published in:

Industrial Electronics, Control, and Instrumentation, 1993. Proceedings of the IECON '93., International Conference on

Date of Conference:

15-19 Nov 1993