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A Full Regulated Two Output Forward Converter with a Novel Parallel Regulation Technique
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| Author(s) |
A. Ferreres; J. A. Carrasco; A.E. Navarro; R. García; E. J. Dede |
| Abstract |
The complete elimination of cross-regulation in
PWM multiple-output converters requires
post-regulation. For medium-high output
currents the more usual post-regulators are: the
PWM regulators in cascade, the magamp, and
the synchronous switch post-regulators (SSPR)
[1]. The last two are very efficient but their
actuation can only reduce the duty cycle and the
design of the magamp control loop is difficult
due to the presence of non linear elements and a
phase delay [2][3].
For high outputs currents an alternative for the
elimination of cross-regulation is the parallel
post-regulator with controlled transformer [4]
[5], this combines a good efficiency and the
easiness of design of classical switching power
supplies. The idea is based on handling only a
percentage of the power delivered by the output
in order to regulate it. By using the transformer
the post-regulator adds a positive or negative
voltage to the output filter and adjusts the voltssecond
balance.
The model for a parallel post-regulator is not
described for PWM converters. This paper
describes the post-regulation strategy for
obtaining two outputs independently regulated,
and presents a model to obtain the control
transfer function and the expressions of
cross-impedances. |
| Download |
| Filename: | EPE1999 - PP00652 - Ferreres.pdf |
| Filesize: | 120.8 KB |
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| Type |
Members Only |
| Date |
Last modified 2004-03-24 by System |
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