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Fig 1.

Simplified electrical model of a single PEH unit.

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Fig 1 Expand

Fig 2.

Series equivalent circuit of PEH system.

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Fig 2 Expand

Fig 3.

Parallel equivalent circuit of PEH system.

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Fig 3 Expand

Fig 4.

Series-parallel equivalent circuit of PEH.

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Fig 4 Expand

Fig 5.

Experimental configuration for PEH system evaluation.

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Fig 5 Expand

Fig 6.

Current in the load of two piezoelectric elements in series.

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Fig 6 Expand

Fig 7.

Current in the load of two piezoelectric elements in parallel.

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Fig 7 Expand

Fig 8.

Percentage relative error (PRE) with two piezoelectric elements in series.

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Fig 8 Expand

Fig 9.

Percentage relative error (PRE) with two piezoelectric elements in parallel.

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Fig 9 Expand