Soft Switching in Switched Inertance Hydraulic Circuits

Alexander C. Yudell, James D. Van De Ven

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


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%.

Original languageEnglish (US)
Article number121007
JournalJournal of Dynamic Systems, Measurement and Control, Transactions of the ASME
Issue number12
StatePublished - Dec 1 2017

Bibliographical note

Publisher Copyright:
© 2017 by ASME.


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