A single-phase resonant snubber inverter with fixed timing control for a UPS

In a UPS, the output voltage of a single-phase inverter is filtered with an LC filter to provide a sinusoidal output voltage. Since this inverter has an inductive load like an inverter for a motor drive, topologies for ZVS inverters utilized for motor drives can also be applied in the UPS application. A single-phase resonant snubber inverter (RSI) for application in a UPS has been developed. Analysis of the RSI in a normalized state plane provided insight into the operation of this ZVS inverter. Based on this analysis, fixed timing control based on the direction of the current flowing through the inductor in the output filter was implemented to control the auxiliary switches in a prototype RSI. The direction of the inductor current was sensed using a secondary winding on the output filter inductor. Experimental results are provided for a 1 kW prototype RSI in a UPS.

[1]  R. M. Nelms,et al.  State plane analysis of an auxiliary resonant commutated pole inverter and implementation with load current adaptive fixed timing control , 2002, IEEE 2002 28th Annual Conference of the Industrial Electronics Society. IECON 02.

[2]  R.M. Nelms,et al.  Geometric modeling and analysis of a family of ZVS inverters , 2003, IEEE 34th Annual Conference on Power Electronics Specialist, 2003. PESC '03..

[3]  Jih-Sheng Lai.  Fundamentals of a new family of auxiliary resonant snubber inverters , 1997, Proceedings of the IECON'97 23rd International Conference on Industrial Electronics, Control, and Instrumentation (Cat. No.97CH36066).

[4]  R.W. De Doncker,et al.  The auxiliary resonant commutated pole converter , 1990, Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting.

[5]  Robert W. Erickson,et al.  Steady state analysis of the duty cycle controlled series resonant converter , 1987, IEEE Power Electronics Specialists Conference.

[6]  Colonel William T. McLyman,et al.  Transformer and inductor design handbook , 1978 .

[7]  Fred C. Lee,et al.  State-plane analysis of parallel resonant converter , 1985, 1985 IEEE Power Electronics Specialists Conference.

[8]  Mehrdad Ehsani,et al.  A review of soft-switched DC-AC converters , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.