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research-article

SOFT SWITCHING IN SWITCHED INERTANCE HYDRAULIC CIRCUITS

[+] Author and Article Information
Alexander C. Yudell

Department of Mechanical Engineering University of Minnesota 111 Church St. SE Minneapolis, MN 55455
yudel004@umn.edu

James D. Van de Ven

Department of Mechanical Engineering University of Minnesota 111 Church St. SE Minneapolis, MN 55455
vandeven@umn.edu

1Corresponding author.

ASME doi:10.1115/1.4036887 History: Received December 07, 2016; Revised May 16, 2017

Abstract

Switched Inertance Hydraulic Systems (SIHS) use inductive, capacitive, and switching elements to boost or “buck” (reduce) a pressure from a source to a load in an ideally lossless manner. Real SIHS circuits suffer a variety of energy losses, with throttling of flow during transitions of the high-speed valve resulting in as much as 44% of overall losses. These throttling energy losses can be mitigated by applying the analog of zero-voltage-switching, a soft switching strategy, adopted from power electronics. In the soft switching circuit, the flow that would otherwise be throttled across the transitioning valve is stored in a capacitive element and bypassed through check valves in parallel with the switching valves. To evaluate the effectiveness of soft switching in a boost converter SIHS, a lumped parameter model was constructed. Simulation demonstrates that soft switching improves the efficiency of the modeled circuit by 42% at peak load power and extends the power delivery capabilities by 77%.

Copyright (c) 2017 by ASME
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