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%.
Soft Switching in Switched Inertance Hydraulic Circuits
Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received December 7, 2016; final manuscript received May 16, 2017; published online August 10, 2017. Assoc. Editor: Heikki Handroos.
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Yudell, A. C., and Van de Ven, J. D. (August 10, 2017). "Soft Switching in Switched Inertance Hydraulic Circuits." ASME. J. Dyn. Sys., Meas., Control. December 2017; 139(12): 121007. https://doi.org/10.1115/1.4036887
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