Rudolf Scheidl, Helmut Kogler, Philipp Zagar,
"A Hydraulically Controlled Multiple Buck Converter System"
: Proceedings of the 2022 BATH/ASME Symposium on Fluid Power and Motion Control FPMC 2022 September 14-16, 2022, University of Bath, Bath, UK., 9-2022
A Hydraulically Controlled Multiple Buck Converter System
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Proceedings of the 2022 BATH/ASME Symposium on Fluid Power and Motion Control FPMC 2022 September 14-16, 2022, University of Bath, Bath, UK.
The hydraulic buck converter with a pipe as inertance element is mostly considered with magnetically actuated fast switching valves. These valves are hardly available on the market and are costly. A further burden of most buck converters are the high hydraulic capacitances added on load side to flatten pulsation. They lead to a softness which requires sophisticated control.
A previous study on a phase shifted operation of several buck converters showed a low pulsation which may make an extra pulsation attenuation device obsolete. Another study suggested a hydraulic actuation of the switching valves. In this paper a combination of these concepts is analyzed. It realizes a constant switching frequency with a variable duty cycle and a phase shifted switching of the several converter units. The performance is compared to control by a single servo valve and a multiple converter system using electrically actuated valves.