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Study on Pyroelectric Harvesters with Various Geometry
#MMPMID26270666
Siao AS
; Chao CK
; Hsiao CC
Sensors (Basel)
2015[Aug]; 15
(8
): 19633-48
PMID26270666
show ga
Pyroelectric harvesters convert time-dependent temperature variations into
electric current. The appropriate geometry of the pyroelectric cells, coupled
with the optimal period of temperature fluctuations, is key to driving the
optimal load resistance, which enhances the performance of pyroelectric
harvesters. The induced charge increases when the thickness of the pyroelectric
cells decreases. Moreover, the induced charge is extremely reduced for the
thinner pyroelectric cell when not used for the optimal period. The maximum
harvested power is achieved when a 100 ?m-thick PZT (Lead zirconate titanate)
cell is used to drive the optimal load resistance of about 40 M?. Moreover, the
harvested power is greatly reduced when the working resistance diverges even
slightly from the optimal load resistance. The stored voltage generated from the
75 ?m-thick PZT cell is less than that from the 400 ?m-thick PZT cell for a
period longer than 64 s. Although the thinner PZT cell is advantageous in that it
enhances the efficiency of the pyroelectric harvester, the much thinner 75
?m-thick PZT cell and the divergence from the optimal period further diminish the
performance of the pyroelectric cell. Therefore, the designers of pyroelectric
harvesters need to consider the coupling effect between the geometry of the
pyroelectric cells and the optimal period of temperature fluctuations to drive
the optimal load resistance.
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