Multiblock Soft-Switched Bidirectional AC-AC Converter Using a Single Loss-Less Active Snubber Block

A multiblock soft-switched bidirectional ac-ac converter using an active snubber is proposed in this paper. The snubber provides zero-voltage switching (ZVS) for the main switches of the entire power converter blocks in the entire input voltages and polarities. To achieve ZVS operation, the snubber...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2012-05, Vol.27 (5), p.2260-2272
Main Authors: Safaee, A., Yazdani, D., Bakhshai, A., Jain, P. K.
Format: Article
Language:English
Subjects:
AC-AC converter
Applied sciences
Bidirectional
bidirectional converter
Blocking
Capacitors
Circuit properties
Connection and protection apparatus
Converters
Electric currents
Electric power
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electrical equipment
Electronic circuits
Electronics
Exact sciences and technology
Inductors
Polarity
Power electronics, power supplies
Prototypes
Signal convertors
Snubbers
soft-switching techniques
Switches
Switching
Switching frequency
Switching loss
Switching, multiplexing, switched capacity circuits
Voltage
Zero voltage switching
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Summary:A multiblock soft-switched bidirectional ac-ac converter using an active snubber is proposed in this paper. The snubber provides zero-voltage switching (ZVS) for the main switches of the entire power converter blocks in the entire input voltages and polarities. To achieve ZVS operation, the snubber block extracts the energy of the main switch drain-source capacitors and delivers it to the high-voltage side. Moreover, the snubber switches have zero-current switching (ZCS) turn-on and ZVS turn-off transitions. The performance of the proposed converter system is evaluated on a prototype including two converter blocks of 500 W working at 150 kHz with an input-voltage range of 110 V (-30% to +20%) and output of 175 V. Experimental results confirm that the proposed snubber improves the efficiency by 3% (4%) at half (full) load power for the entire input-voltage range.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2011.2172959