Low-loss quasi-parallel resonant DC link inverter with advanced PWM capability

A low-loss quasi-parallel resonant DC link (L 2 QPRDCL) circuit with advanced PWM capability is proposed for soft switching a three-phase PWM inverter. This L 2 QPRDCL has minimum voltage stress for the devices, and an advanced PWM capability due to the variable zero voltage duration of the DC-link...

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Bibliographic Details
Published in:International journal of electronics 1996-08, Vol.81 (2), p.219-234
Main Authors: JUNG, YONG-CHAE, CHO, GYU-HYEONG
Format: Article
Language:English
Subjects:
Applied sciences
Electrical engineering. Electrical power engineering
Exact sciences and technology
Power electronics, power supplies
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Summary:A low-loss quasi-parallel resonant DC link (L 2 QPRDCL) circuit with advanced PWM capability is proposed for soft switching a three-phase PWM inverter. This L 2 QPRDCL has minimum voltage stress for the devices, and an advanced PWM capability due to the variable zero voltage duration of the DC-link over a wide range. Owing to there being scarcely any freewheeling current in the L 2 QPRDCL during the zero voltage period, low-loss operation in the resonant circuit can be obtained. As a result, the proposed L 2 QPRDCL inverter is applicable to the highpower range. Operational principles and detailed analyses are presented. By adopting the non-nearest four vectors (N 2 FV) selection law in the space vector PWM technique, the narrow pulse problem originating from the link operation, which should be considered in those inverters having resonant DC-links, can be eliminated. Experimental results are also presented to verify the link operation and the performance of the selected space vector PWM method.
ISSN:0020-7217
1362-3060
DOI:10.1080/002072196136887