Abstract
When using a single DC/DC converter with multiple outputs and having a buck topology, which has one filter inductor per output, the designer can choose to couple these outputs together. This paper demonstrates additional benefits of coupling output inductors together. Apart from saving mass and volume, and due to an improved small signal behaviour it also reduces the output impedance of the regulated output. The paper will analyse a seven output push-pull converter used as a space power converter module and verify the theoretical results with experimental measurements.
Highlights
Coupled inductors applied to interleaved topologies have already been studied in [1] [2] [3] [4]
This paper presents a detailed study of the output impedance of seven coupled inductors used together with primary peak current control in a push-pull converter
This SPICE circuit includes many of the existing parasitic elements, the input filter, internal blocks of the PWM modulator, rectifying output diodes and resistance of tracks and switching devices
Summary
Coupled inductors applied to interleaved topologies have already been studied in [1] [2] [3] [4] Their use in multiple output converters, usually applying weighted control, is studied in [1] [5] [6] [7] and an improvement of cross regulation has been demonstrated in [5]. In [9], the authors propose to use coupled inductors to improve the transient response of high power output feeding load voltage / high current loads. It is a way of taking advantage of the lower output impedance of coupled inductor converters
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