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Research Papers

Soft Switching in Switched Inertance Hydraulic Circuits

[+] Author and Article Information
Alexander C. Yudell

Department of Mechanical Engineering,
University of Minnesota,
111 Church Street SE,
Minneapolis, MN 55455
e-mail: yudel004@umn.edu

James D. Van de Ven

Mem. ASME
Department of Mechanical Engineering,
University of Minnesota,
111 Church Street SE,
Minneapolis, MN 55455
e-mail: vandeven@umn.edu

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.

J. Dyn. Sys., Meas., Control 139(12), 121007 (Aug 10, 2017) (9 pages) Paper No: DS-16-1585; doi: 10.1115/1.4036887 History: Received December 07, 2016; Revised May 16, 2017

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%.

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References

Figures

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Fig. 1

Baseline boost converter hydraulic circuit

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Fig. 2

Soft switching boost converter utilizing spring loaded capacitive elements

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Fig. 3

Soft switched boost converter sequence of operation

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Fig. 4

Zero voltage switching boost converter. Image adapted from Ref. [6].

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Fig. 5

Lumped parameter inertance tube “medium line” model

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Fig. 6

Simulation results of inertance tube mean, peak and minimum flow rates over a switching period versus duty cycle for the baseline boost converter

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Fig. 7

Switched volume pressure inertance tube flow in a baseline boost converter, D=0.7

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Fig. 8

Power losses over a switching cycle in a baseline boost converter, D=0.7

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Fig. 9

Switched volume pressure and inertance tube flow in a soft switched boost converter, D=0.7

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Fig. 10

Power losses over a switching cycle in a soft switched boost converter compared to power losses in a baseline boost converter, D=0.7

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Fig. 11

Efficiency versus duty cycle for a baseline and soft switched circuit. Load flow rate is 0.1 L/s.

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Fig. 12

Load pressure versus duty cycle for a baseline and soft switched circuit. Load flow rate is 0.1 L/s.

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Fig. 13

Efficiency versus load power delivery for a baseline and soft switched circuit. Load flow rate is 0.1 L/s.

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