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Resonant DC link soft-switching inverter without storage capacitor in auxiliary circuit
(PDF)

[ISSN:1007-449X/CN:23-1 408/TM]

Issue:
2017年08
Page:
78-87
Research Field:
Publishing date:

Info

Title:
Resonant DC link soft-switching inverter without storage capacitor in auxiliary circuit
Author(s):
?WANG Qiang TANG Chao-yin WANG Tian-shi LIU Xiao-qin
?( College of Information and Control Engineering,Liaoning Shihua University,Fushun 113001,China)
Keywords:
inverter storage capacitor resonant zero-voltage switching zero-current-switching
PACS:
TM 46
DOI:
10.15938/j.emc.2017.08.011
Abstract:
?Abstract: The storage capacitors that divide the voltage of the DC side in auxiliary circuit are used to supply energy to resonant circuit in the most resonant DC link soft-switching inverter.The disadvantage is that the storage capacitors will cause the center tap potential variation problem.Aiming at this problem,a resonant DC link soft-switching inverter topology circuit is proposed in this paper.It avoided the storage capacitors which were used to divide the voltage in auxiliary circuit and there was no center tap potential variation problem,which improved reliability in the inverter.The structure of the auxiliary circuit was very simple,which was conductive to reduce the cost of hardware and simplified control strategy. The operation principle of the soft-switching inverter was analyzed in detail on the basis of equivalent circuits at different operation modes.The conditions for realization of soft-switching were presented.The mathematical model for auxiliary resonant circuit loss was established.A 3kW laboratory prototype was built.The experiment results verified that the switching devices of this soft-switching inverter can realize soft-switching and the soft-switching inverter presented effectively reduces switching loss and improves efficiency.

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Last Update: 2017-11-20