Switch-mode hydraulic circuits, analogous to switch-mode power electronics, provide variable power control topologies that rely on switching between efficient on and off states. A challenge in realizing these circuits is the need for a high-speed valve with fast transition time and high switching frequency. The work presented includes the design and modeling of a suitable valve and experimental demonstration of the prototype in a pressure boost converter. The valve architecture consists of a dual spool design actuated by a crank-slider mechanism. The valve design constraints included a switching frequency up to 120 Hz, a transition ratio of 5% of the cycle period, and a flow rate of 22.8 lpm at a 0.6 MPa pressure drop. The valve prototype was validated with experimental demonstration in a pressure boost converter accomplishing boost ratios between 1.08-2.06. This high-speed valve enables switch-mode circuit studies that can improve efficiency in future work.
University of Minnesota M.S.M.E. thesis. June 2016. Major: Mechanical Engineering. Advisor: JAMES VAN DE VEN. 1 computer file (PDF); vii, 130 pages.
Design of a High-Speed Crank-Slider Valve for use in Hydraulic Switch-Mode Systems with Experimental Validation in a Pressure Boost Converter Circuit.
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