US5644184A — Piezo-pyroelectric energy converter and method

Claim 1

Independent Claim 73 words

An energy conversion device, comprising: one or more plates formed of piezo-pyroelectric material; thermally conductive electrodes interleaved with said one or more plates forming a capacitor; hot and cold heat sinks in thermal communication with said electrodes; means for holding said one or more plates together; means coupled to said capacitor for applying voltage and resonant frequency thereto; and means coupled to said capacitor for removing electrical charge therefrom created from piezo-pyroelectric effects.

Claim 2

Dependent Claim 73 words

An energy conversion device, comprising: one or more plates formed of piezo-pyroelectric material; thermally conductive electrodes interleaved with said one or more plates forming a capacitor; hot and cold heat sinks in thermal communication with said electrodes; means for holding said one or more plates together; means coupled to said capacitor for applying voltage and resonant frequency thereto; and means coupled to said capacitor for removing electrical charge therefrom created from piezo-pyroelectric effects.

Claim 3

Dependent Claim 37 words

A device defined in claim 1, wherein said one or more plates comprises PZT, BaNaNb 5 O 15 , PVDF, BaTiO 3 , LiNbO 3 , LiTaO 3 , PbScTaO x , YMnO 3 , or PZST.

Claim 4

Dependent Claim 15 words

A device defined in claim 1, wherein said electrodes comprise electrically and thermally conductive materials.

Claim 5

Dependent Claim 24 words

A device defined in claim 1, wherein said electrodes comprise Au, Au--Ni, Ag, Pd, Ni, Cu, Al, Mg, Ag--Pd, or combinations or alloys thereof.

Claim 6

Dependent Claim 22 words

A device defined in claim 1, wherein said electrodes comprise C, TiN, ZiN, HfN, TiC, ZrC, WC, or combinations or alloys thereof.

Claim 7

Dependent Claim 13 words

A device defined in claim 1, wherein said electrodes comprise Pt or Ir.

Claim 8

Dependent Claim 20 words

A device defined in claim 1, further comprising diffusion barriers disposed between said one or more plates and said electrodes.

Claim 9

Dependent Claim 14 words

A device defined in claim 7, wherein said diffusion barriers comprise SiC or SiN.

Claim 10

Dependent Claim 15 words

A device defined in claim 7, wherein said diffusion barriers comprise doped-diamond electrically conductive coatings.

Claim 11

Dependent Claim 20 words

A device defined in claim 7, wherein said diffusion barriers comprise W, Re, Os, Ir, Pt, Au, or combinations thereof.

Claim 12

Dependent Claim 18 words

A device defined in claim 1, wherein said hot and cold heat sinks comprise metal or metal alloys.

Claim 13

Dependent Claim 19 words

A device defined in claim 11, further comprising thermally conductive graphite lubrication disposed on said metal or metal alloys.

Claim 14

Dependent Claim 19 words

A device defined in claim 1, further comprising an electric insulator disposed between the capacitor and the heat sinks.

Claim 15

Dependent Claim 28 words

A device defined in claim 13, wherein said electric insulator comprises TEFLON, KAPTON, Al 2 O 3 , AlN, MgO, NiO 2 , SiO 2 , or BeO.

Claim 16

Dependent Claim 16 words

A device defined in claim 1, wherein said hot and cold heat sinks comprise ceramic material.

Claim 17

Dependent Claim 33 words

A device defined in claim 15, wherein said ceramic material comprises BeO, AlN, SiO 2 , SiC, MgO 2 , NiO 2 , TiB 2 , W 2 B 5 , or SiN.

Claim 18

Dependent Claim 26 words

A device defined in claim 1, wherein said hot and cold heat sinks comprise a thermally conductive dielectric material coated on the one or more plates.

Claim 19

Dependent Claim 43 words

A device defined in claim 17, wherein said dielectric material comprises aluminum nitride, non-doped diamond coatings, aluminum oxide, zirconium oxide, titanium oxide, yttrium oxide, magnesium oxide, beryllium oxide, silicon oxide, nickel dioxide, scandium oxide, hafnium oxide, lanthanoid oxides, thorium oxide, or uranium oxide.

Claim 20

Dependent Claim 15 words

A device defined in claim 1, wherein said hot and cold heat sinks comprise graphite.

Claim 21

Dependent Claim 21 words

A device defined in claim 1, wherein said holding means comprises a compressing frame internal to said one or more plates.

Claim 22

Dependent Claim 49 words

A device defined in claim 20, wherein said compressing frame comprises: a rod centrally disposed to said one or more plates, said rod having first and second ends; and compressing elements disposed on the first and second ends for applying a compressive force to the one or more plates.

Claim 23

Dependent Claim 21 words

A device defined in claim 21, wherein said first and second ends include threads and the compressing elements comprise threaded nuts.

Claim 24

Dependent Claim 21 words

A device defined in claim 22, further comprising compression washers disposed between the one or more plates and the threaded nuts.

Claim 25

Dependent Claim 16 words

A device defined in claim 23, wherein said compressing washers are disposed on a dielectric tube.

Claim 26

Dependent Claim 75 words

A device defined in claim 20, wherein said compressing frame comprises: one or more supporting elements rigidly secured to the hot or cold heat sink; and a rod disposed internal to the one or more plates and having a first and second end, said first end being rigidly affixed to said one or more supporting elements and the second end having a compressing element for applying a compressive force to the one or more plates.

Claim 27

Dependent Claim 20 words

A device defined in claim 25, wherein said second end includes threads and the compressing element comprises a threaded nut.

Claim 28

Dependent Claim 27 words

A device defined in claim 26, further comprising dielectric washers disposed between the one or more supporting elements, the one or more plates, and the threaded nut.

Claim 29

Dependent Claim 21 words

A device defined in claim 1, wherein said holding means comprises a compressing frame external to said one or more plates.

Claim 30

Dependent Claim 45 words

A device defined in claim 28, wherein said compressing frame comprises: first and second supporting elements rigidly secured to the hot or cold heat sink; and a compressing element threadably engaged with said first supporting element for applying force to said one or more plates.

Claim 31

Dependent Claim 26 words

A device defined in claim 29, further comprising thermal insulator washers disposed between the one or more plates and said compressing frame and said compressing element.

Claim 32

Dependent Claim 18 words

A device defined in claim 30, further comprising a spring disposed between said compressing element and said washer.

Claim 33

Dependent Claim 19 words

A device defined in claim 31, wherein said compressing frame is formed with the hot or cold heat sinks.

Claim 34

Dependent Claim 68 words

A device defined in claim 1, wherein said means for applying voltage and resonant frequency ω o comprises a function generator, and resonant voltage being governed by the equation V(t)=V o sin(ωt), and said resonant frequency ω o being governed by capacitor internal acoustic resonance and related to the resonant circuit by the equation ##EQU23## where L is the inductance and C is the capacitance of the capacitor.

Claim 35

Dependent Claim 22 words

A device defined in claim 1, further comprising frequency adjusting means for varying the resonant frequency due to acoustic resonance frequency variation.

Claim 36

Dependent Claim 16 words

A device defined in claim 34, wherein said frequency adjusting means comprises a variable inductance device.

Claim 37

Dependent Claim 25 words

A device defined in claim 34, wherein said frequency adjusting means comprises a variable capacitance device connected in series or in parallel with said capacitor.

Claim 38

Dependent Claim 21 words

A device defined in claim 1, further comprising means for controlling hot or cold heat sink temperature or a combination thereof.

Claim 39

Dependent Claim 18 words

A device defined in claim 1, further comprising means for controlling hot sink temperature and resonant circuit frequency.

Claim 40

Dependent Claim 35 words

A device defined in claim 1, wherein said charge removal means comprises a switch comprising a resonant contour formed of said capacitor and an inductance, said contour being driven by a pulse/sine or function generator.

Claim 41

Dependent Claim 27 words

A device defined in claim 39, wherein said generator has an output impedance of at least about 1 kΩ and is connected directly across said resonant contour.

Claim 42

Dependent Claim 35 words

A device defined in claim 39, wherein said inductance comprises a first winding of a transformer having a frequency of at least said capacitor resonant frequency and a second winding being connected to said generator.

Claim 43

Dependent Claim 111 words

A device defined in claim 1, wherein said charge removal means comprises a switch comprising: a resonant contour formed of said capacitor, said contour being driven by a pulse/sine or function generator; an inductance, said inductance being a first winding of a transformer having a frequency of at least said capacitor resonant frequency, said transformer having a second winding connected to said generator; and an extracting circuit connected in parallel to said contour, said extracting circuit comprising a Zener diode and a first winding of a transformer having a frequency of at least said capacitor resonant frequency, said transformer having a second winding connected to a useful load through a rectifier.

Claim 44

Dependent Claim 15 words

A device defined in claim 42, wherein part of said useful load feeds the generator.

Claim 45

Dependent Claim 25 words

A device defined in claim 42, wherein said generator is powered by a start-up battery having a timer which is part of the useful load.

Claim 46

Dependent Claim 23 words

A device defined in claim 1, wherein said hot and cold heat sinks are at a temperature differential when said voltage is applied.

Claim 47

Dependent Claim 22 words

A device defined in claim 1, wherein said hot and cold heat sinks are at equal temperatures when said voltage is applied.

Claim 48

Dependent Claim 28 words

A device defined in claim 1, wherein said one or more plates and said electrodes are wedge-shaped, said electrodes having a widest cross-section adjacent said cold heat sink.

Claim 49

Dependent Claim 19 words

A device defined in claim 1, wherein said one or more plates are wedge-shaped and said electrodes are planar-shaped.

Claim 50

Dependent Claim 12 words

A device defined in claim 48, further comprising a passive wedge-shaped material.

Claim 51

Dependent Claim 15 words

A device defined in claim 49, wherein said passive wedge-shaped material comprises mica or KAPTON™.

Claim 52

Dependent Claim 83 words

An energy conversion device, comprising: one or more plates comprising lead scandium tantalate; thermally conductive electrodes interleaved with said one or more plates forming a capacitor; electric insulators being adjacent to said electrodes; hot and cold heat sinks in thermal communication with said electric insulators, said electric insulators disposed between said hot and cold heat sinks and said electrodes; means coupled to said capacitor for applying voltage thereto; and means coupled to said capacitor for removing electrical charge therefrom created from pyroelectric effects.

Claim 53

Dependent Claim 83 words

An energy conversion device, comprising: one or more plates comprising lead scandium tantalate; thermally conductive electrodes interleaved with said one or more plates forming a capacitor; electric insulators being adjacent to said electrodes; hot and cold heat sinks in thermal communication with said electric insulators, said electric insulators disposed between said hot and cold heat sinks and said electrodes; means coupled to said capacitor for applying voltage thereto; and means coupled to said capacitor for removing electrical charge therefrom created from pyroelectric effects.

Claim 54

Dependent Claim 41 words

A device defined in claim 51, wherein said electrodes are U-shaped, having left and right legs and a bottom whereby the left and right legs are in thermal communication with the electric insulators and the bottom being adjacent to said plate.

Claim 55

Dependent Claim 19 words

A device defined in claim 51, wherein a gap is disposed between the plate and the hot heat sink.

Claim 56

Dependent Claim 14 words

A device defined in claim 53, wherein said gap comprises air, gas, or vacuum.

Claim 57

Dependent Claim 19 words

A device defined in claim 51, wherein a gap is disposed between the plate and the cold heat sink.

Claim 58

Dependent Claim 14 words

A device defined in claim 55, wherein said gap comprises air, gas, or vacuum.

Claim 59

Dependent Claim 14 words

A device defined in claim 51, wherein said voltage means comprises a pulse generator.

Claim 60

Dependent Claim 15 words

A device defined in claim 51, wherein said voltage means comprises a sine wave generator.

Claim 61

Dependent Claim 35 words

A device defined in claim 51, wherein said charge removal means comprises a switch comprising a resonant contour formed of said capacitor and an inductance, said contour being driven by a pulse/sine or function generator.

Claim 62

Dependent Claim 35 words

A device defined in claim 59, wherein said inductance comprises a first winding of a transformer having a frequency of at least said capacitor resonant frequency and a second winding being connected to said generator.

Claim 63

Dependent Claim 111 words

A device defined in claim 51, wherein said charge removal means comprises a switch comprising: a resonant contour formed of said capacitor, said contour being driven by a pulse/sine or function generator; an inductance, said inductance being a first winding of a transformer having a frequency of at least said capacitor resonant frequency, said transformer having a second winding connected to said generator; and an extracting circuit connected in parallel to said contour, said extracting circuit comprising a Zener diode and a first winding of a transformer having a frequency of at least said capacitor resonant frequency, said transformer having a second winding connected to a useful load through a rectifier.

Claim 64

Dependent Claim 15 words

A device defined in claim 61, wherein part of said useful load feeds the generator.

Claim 65

Dependent Claim 25 words

A device defined in claim 61, wherein said generator is powered by a start-up battery having a timer which is part of the useful load.

Claim 66

Dependent Claim 23 words

A device defined in claim 51, wherein said hot and cold heat sinks are at a temperature differential when said voltage is applied.

Claim 67

Dependent Claim 22 words

A device defined in claim 51, wherein said hot and cold heat sinks are at equal temperatures when said voltage is applied.

Claim 68

Dependent Claim 169 words

An energy conversion device, comprising: a capacitor, said capacitor including a U-shaped electrode, a plate comprising lead scandium tantalate adjacent said U-shaped electrode, a second electrode in the form of a plate adjacent said plate comprising lead scandium tantalate, an electric insulator adjacent said second electrode, a plate comprising PZT-5A adjacent said electric insulator, and a third electrode in the form of a plate adjacent said plate comprising PZT-5A; a means for holding said capacitor together; electric insulators, said U-shaped electrodes having first and second legs and a bottom, said electric insulators being adjacent to said first and second legs and said bottom being adjacent to said plate comprising lead scandium tantalate; hot and cold heat sinks in thermal communication with said electric insulators, said electric insulators disposed between said hot and cold heat sinks and said first and second legs of said U-shaped electrode; means coupled to said capacitor for applying voltage thereto; and means coupled to said capacitor for removing electrical charge therefrom created from piezo-pyroelectric effects.

Claim 69

Dependent Claim 169 words

An energy conversion device, comprising: a capacitor, said capacitor including a U-shaped electrode, a plate comprising lead scandium tantalate adjacent said U-shaped electrode, a second electrode in the form of a plate adjacent said plate comprising lead scandium tantalate, an electric insulator adjacent said second electrode, a plate comprising PZT-5A adjacent said electric insulator, and a third electrode in the form of a plate adjacent said plate comprising PZT-5A; a means for holding said capacitor together; electric insulators, said U-shaped electrodes having first and second legs and a bottom, said electric insulators being adjacent to said first and second legs and said bottom being adjacent to said plate comprising lead scandium tantalate; hot and cold heat sinks in thermal communication with said electric insulators, said electric insulators disposed between said hot and cold heat sinks and said first and second legs of said U-shaped electrode; means coupled to said capacitor for applying voltage thereto; and means coupled to said capacitor for removing electrical charge therefrom created from piezo-pyroelectric effects.

Claim 70

Dependent Claim 14 words

A device defined in claim 66, wherein said voltage means comprises a pulse generator.

Claim 71

Dependent Claim 15 words

A device defined in claim 66, wherein said voltage means comprises a sine wave generator.

Claim 72

Dependent Claim 35 words

A device defined in claim 66, wherein said charge removal means comprises a switch comprising a resonant contour formed of said capacitor and an inductance, said contour being driven by a pulse/sine or function generator.

Claim 73

Dependent Claim 35 words

A device defined in claim 69, wherein said inductance comprises a first winding of a transformer having a frequency of at least said capacitor resonant frequency and a second winding being connected to said generator.

Claim 74

Dependent Claim 111 words

A device defined in claim 66, wherein said charge removal means comprises a switch comprising: a resonant contour formed of said capacitor, said contour being driven by a pulse/sine or function generator; an inductance, said inductance being a first winding of a transformer having a frequency of at least said capacitor resonant frequency, said transformer having a second winding connected to said generator; and an extracting circuit connected in parallel to said contour, said extracting circuit comprising a Zener diode and a first winding of a transformer having a frequency of at least said capacitor resonant frequency, said transformer having a second winding connected to a useful load through a rectifier.

Claim 75

Dependent Claim 15 words

A device defined in claim 71, wherein part of said useful load feeds the generator.

Claim 76

Dependent Claim 25 words

A device defined in claim 71, wherein said generator is powered by a start-up battery having a timer which is part of the useful load.

Claim 77

Dependent Claim 36 words

A device as defined in claim 66, further comprising a material having a lower thermal conductivity than said one or more plates, said material disposed between said one or more plates and said hot heat sink.

Claim 78

Dependent Claim 14 words

A device defined in claim 74, wherein said material comprises pressed fiberglass or mica.

Claim 79

Dependent Claim 23 words

A device defined in claim 66, wherein said hot and cold heat sinks are at a temperature differential when said voltage is applied.

Claim 80

Dependent Claim 22 words

A device defined in claim 66, wherein said hot and cold heat sinks are at equal temperatures when said voltage is applied.

Claim 81

Independent Claim 69 words

A method of converting energy comprising the steps of: a) holding together one or more plates formed of piezo-pyroelectric material having thermally and electrically conductive electrodes interleaved with said one or plates forming a capacitor, and said electrodes in thermal communication with hot and cold heat sinks; b) applying a voltage and resonant frequency to said capacitor; and c) removing electrical charge created by piezo-pyroelectric effects from said capacitor.

Claim 82

Independent Claim 69 words

A method of converting energy comprising the steps of: a) holding together one or more plates formed of piezo-pyroelectric material having thermally and electrically conductive electrodes interleaved with said one or plates forming a capacitor, and said electrodes in thermal communication with hot and cold heat sinks; b) applying a voltage and resonant frequency to said capacitor; and c) removing electrical charge created by piezo-pyroelectric effects from said capacitor.

Claim 83

Dependent Claim 23 words

A method defined in claim 78, wherein said hot and cold heat sinks are at a temperature differential when said voltage is applied.

Claim 84

Dependent Claim 22 words

A method defined in claim 78, wherein said hot and cold heat sinks are at equal temperatures when said voltage is applied.

Claim 85

Independent Claim 76 words

A method of converting energy comprising the steps of: a) holding together one or more plates formed of lead scandium tantalate having thermally and electrically conductive electrodes interleaved with said one or plates forming a capacitor with electric insulators adjacent to said electrodes, and said electric insulators disposed between hot and cold heat sinks and said electrodes; b) applying a voltage to said capacitor; and c) removing electrical charge created by pyroelectric effects from said capacitor.

Claim 86

Independent Claim 76 words

A method of converting energy comprising the steps of: a) holding together one or more plates formed of lead scandium tantalate having thermally and electrically conductive electrodes interleaved with said one or plates forming a capacitor with electric insulators adjacent to said electrodes, and said electric insulators disposed between hot and cold heat sinks and said electrodes; b) applying a voltage to said capacitor; and c) removing electrical charge created by pyroelectric effects from said capacitor.

Claim 87

Dependent Claim 23 words

A method defined in claim 81, wherein said hot and cold heat sinks are at a temperature differential when said voltage is applied.

Claim 88

Dependent Claim 22 words

A method defined in claim 81, wherein said hot and cold heat sinks are at equal temperatures when said voltage is applied.

Claim 89

Independent Claim 169 words

A method of converting energy comprising the steps of: a) holding a capacitor together, said capacitor comprising: a U-shaped electrode; a plate comprising lead scandium tantalate adjacent said U-shaped electrode; a second electrode in the form of a plate adjacent said plate comprising lead scandium tantalate; an electric insulator adjacent said second electrode; a plate comprising PZT-5A adjacent said electric insulator; and a third electrode in the form of a plate adjacent said plate comprising PZT-5A; said capacitor further comprising electric insulators, said U-shaped electrodes having first and second legs and a bottom, said electric insulators being adjacent to said first and second legs and said bottom being adjacent to said plate comprising lead scandium tantalate, and hot and cold heat sinks in thermal communication with said electric insulators, said electric insulators disposed between said hot and cold heat sinks and said first and second legs of said U-shaped electrode; b) applying a voltage to said capacitor; and c) removing electrical charge created by piezo-pyroelectric effects from said capacitor.

Claim 90

Independent Claim 169 words

A method of converting energy comprising the steps of: a) holding a capacitor together, said capacitor comprising: a U-shaped electrode; a plate comprising lead scandium tantalate adjacent said U-shaped electrode; a second electrode in the form of a plate adjacent said plate comprising lead scandium tantalate; an electric insulator adjacent said second electrode; a plate comprising PZT-5A adjacent said electric insulator; and a third electrode in the form of a plate adjacent said plate comprising PZT-5A; said capacitor further comprising electric insulators, said U-shaped electrodes having first and second legs and a bottom, said electric insulators being adjacent to said first and second legs and said bottom being adjacent to said plate comprising lead scandium tantalate, and hot and cold heat sinks in thermal communication with said electric insulators, said electric insulators disposed between said hot and cold heat sinks and said first and second legs of said U-shaped electrode; b) applying a voltage to said capacitor; and c) removing electrical charge created by piezo-pyroelectric effects from said capacitor.

Claim 91

Dependent Claim 23 words

A method defined in claim 84, wherein said hot and cold heat sinks are at a temperature differential when said voltage is applied.

Claim 92

Dependent Claim 22 words

A method defined in claim 84, wherein said hot and cold heat sinks are at equal temperatures when said voltage is applied.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2000-06-30	2000-12-30	2001-07-01	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2004-06-30	2004-12-30	2005-07-01	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2008-06-30	2008-12-30	2009-07-01	$7700.00	Window Closed / Lapsed

Piezo-pyroelectric energy converter and method

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