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Digital Variable Frequency Control for Zero Voltage Switching and Interleaving of Synchronous Buck Converters
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| Author(s) |
Pal Andreassen, Giuseppe Guidi, Tore Undeland |
| Abstract |
When a synchronous buck converter is operated
with zero voltage switching (ZVS) and fixed frequency, the
direction of the current in the output inductor is alternated
each switching period. Thus the output current ripple of the
converter is high to ensure zero voltage switching operation
at maximum load. With interleaved outputs this leads to
high circulating currents at low loads. In this paper, to
minimize circulating currents at low loads, solutions for
digital control of ZVS with variable switching frequency
and interleaving control for bidirectional power flow are
presented. The methods have been implemented in a DSP
and verified by measurements. |
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| Filename: | T3-114.pdf |
| Filesize: | 338.8 KB |
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| Type |
Members Only |
| Date |
Last modified 2007-03-08 by System |
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