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Low Power Multiple Output DC Supply – Part II: Crossover Voltage Control in Multiple Output DC Supply
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| Author(s) |
Peter Zajec, Danijel Voncina, Janez Nastran, Marko Petkovsek |
| Abstract |
The paper proposes a new topology for multiple
outputs DC supplies allowing for implementation of
commercial low power AC/DC converters. A special
attention is paid to supplying mixed analogue/digital circuits
that give rise to permissive voltage deviations when
discontinuous load currents are applied. To avoid this
problem, the paper is particularly concerned with the backend
requirements of the power supply stage generally
generating two system voltages, i.e. the bipolar voltage
(± 12 V) and the unipolar voltage (+5 V), the latter
supplying digital circuits. Here, the main concern is to
ensure efficient output voltages ranging within set
tolerances of ± 5 % and ± 2 %. This requirement is to be
satisfied even in the case of short cutouts of net voltage at no
system functionality minimization. The described back-end
power stage topology consisting of two buck converters
generating three voltages controlled with only one
secondary side PWM controller has proven to be
appropriate for the achievement of this target. With an
adequate crossover control of output voltages the
component and manufacture costs are kept on the low level.
Experimental results confirm the minimization of output
voltages dependence on output currents discontinuity.
Moreover, voltage ratings as well as the size of electrolytic
capacitor providing back-up energy are reduced, too. |
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| Filename: | T2-120.pdf |
| Filesize: | 160.3 KB |
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| Type |
Members Only |
| Date |
Last modified 2007-03-13 by System |
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