CN202797092U - Composite piezoelectric micro power generator - Google Patents
Composite piezoelectric micro power generator Download PDFInfo
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- CN202797092U CN202797092U CN 201220426357 CN201220426357U CN202797092U CN 202797092 U CN202797092 U CN 202797092U CN 201220426357 CN201220426357 CN 201220426357 CN 201220426357 U CN201220426357 U CN 201220426357U CN 202797092 U CN202797092 U CN 202797092U
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Abstract
The utility model relates to a composite piezoelectric micro power generator. Prior piezoelectric cantilever beam type micro power generators utilize a single mode. In the composite piezoelectric micro power generator, a fixed end of a substrate is fixedly arranged on an installation base, a free end is hung in the air, and piezoelectric sheets are arranged on two sides of the substrate respectively. Full electrodes are covered on the piezoelectric sheets, one ends are arranged at the fixed end of the substrate, widths are identical with the width of the substrate, and lengths are 30% to 50% of the length of the substrate. Inter-digital electrodes are covered on the piezoelectric sheets, each of the inter-digital electrodes comprises two unilateral electrodes, and the width of each metal digital bar is equal to a gap between two adjacent metal digital bars. Projections of the full electrodes and the inter-digital electrodes on two surfaces of the substrate are completely overlapped on the substrate. According to a composite d31 and d33 mode piezoelectric micro power generator, two modes can be used simultaneously to generate power under a whole structure, and the output power density is improved.
Description
Technical field
The utility model belongs to the piezo technology field, relates to the little power generator of a kind of composite piezoelectric, specifically a kind of device of the energy being provided for the various Embedded micro-systems such as sensor-based system, actuating system, intelligence system.
Background technology
The piezoelectric micromotor power generator is a kind of by automatically gathering the vibrational energy in the environment, the device of supply circuit system, sensing system energy can be used for the distributed sensor system of the biology sensor of implant into body, the tire pressure monitoring system that places automobile tire inside, factory's motor etc.Utilize the vibrational energy of environment to come little energy source device to system power supply, have the time-independent characteristics of output power density with respect to traditional lithium battery, as: used 1 year, the decline output power density of power generator of piezoelectricity is 250 μ W/ cm
3, the output power density of rechargeable lithium ion batteries is not 45 μ W/ cm
3Used 10 years, the output power density of piezoelectric micromotor power generator still is 250 μ W/ cm
3, the output power density of not chargeable Li ion battery then is 35 μ W/ cm
3Therefrom can find out, the decline output power density of power generator of piezoelectricity is higher than the output power density of lithium ion battery, and can be as lithium ion battery, output power density in time passing and reduce.
At present the piezoelectricity power generator that declines adopts suspension beam structure more.The inequality that adopts suspension beam structure can cause strain to distribute in overarm, usually minimum in the strain of overarm free end, the stiff end strain is maximum.The piezoelectricity overarm power generator that declines has usually based on two kinds of d33 and d31 patterns, and is high based on the hang oneself from a beam output voltage of little power generator of the piezoelectricity of d33 pattern, but electric charge is low; And high based on the hang oneself from a beam electric charge of little power generator of the piezoelectricity of d31 pattern, but output voltage is low.
Summary of the invention
The purpose of this utility model overcomes the deficiencies in the prior art exactly, and a kind of compound power generator that declines of piezoelectricity of high-output power density is provided, and is adapted at using in the systems such as biology sensor, tire pressure monitoring, motor detection.
The utility model comprises pedestal, substrate, piezoelectric patches, full electrode and inserts the finger electrode.
The cross section of described pedestal is L shaped, comprises horizontal base and vertically is arranged on mount pad on the horizontal base.
The stiff end of described substrate is fixedly installed on the mount pad, free end is unsettled; Described substrate is the sheet metal of strip, adopts elastic metallic material; The two sides of substrate is respectively arranged with piezoelectric patches, the complete covered substrate of the one side of piezoelectric patches surface, and another side is provided with full electrode and inserts and refers to electrode.
Described full electrode is conductive metal sheet or metal film, covers on the piezoelectric patches, and the one end is positioned at the stiff end of substrate, and the width of full electrode is identical with the width of substrate, and length h is 30 ﹪～50 ﹪ of substrate length L.
Described slotting finger electrode is conductive metal sheet or metal film, covers on the piezoelectric patches; Each is inserted and refers to that electrode comprises two monolateral electrodes, and each monolateral electrode comprises a plurality of parallel metal fingers, and many metals finger connects by compiling bonding jumper; The metal finger of two monolateral electrodes is crisscross arranged, and forms to insert to refer to electrode; The width a of each metal finger equates with the gap b of two adjacent metal fingers.
The full electrode on substrate two sides and the projection of slotting finger electrode on substrate overlap safely.
The material of described substrate is phosphor bronze, and the material of described piezoelectric patches is doped PZT pottery or ZnO or AlN or PVDF.
During work, the substrate free end is in the situation that stressed or resonance moves up and down, and piezoelectric patches is crooked, causes the deformation of horizontal axis and vertical axial, adopts two kinds of different electrodes can utilize simultaneously both direction deformation, generates electricity.
The utility model is on d33 pattern, d31 mode piezoelectric decline the basis of power generator structure, characteristics in conjunction with the distribution of suspension beam type structural stress, compound d31 and the little power generator of d33 pattern composite piezoelectric are proposed, under an overall structure, can utilize simultaneously two kinds of pattern generatings, improve output power density.
Description of drawings
Fig. 1 is cross-sectional view of the present utility model;
Fig. 2 is plan structure schematic diagram of the present utility model.
Embodiment
As illustrated in fig. 1 and 2, the little power generator of composite piezoelectric comprises pedestal, substrate, piezoelectric patches, full electrode and inserts the finger electrode.
The cross section of described pedestal is L shaped, comprises horizontal base 1-1 and vertically is arranged on mount pad 1-2 on the horizontal base 1-1.
The stiff end of substrate 2 is fixedly installed on the mount pad 1-2, free end is unsettled.Substrate 2 is the sheet metal of strip, adopts elastic metallic material, such as phosphor bronze.The two sides of substrate 2 is respectively arranged with piezoelectric patches 3-1 and 3-2, the complete covered substrate of the one side of piezoelectric patches 2 surfaces, and another side is provided with full electrode and inserts and refers to that electrode, the material of piezoelectric patches are doped PZT pottery or ZnO or AlN or PVDF.
Full electrode 4-1 and 4-2 are conductive metal sheet or metal film, cover respectively on piezoelectric patches 3-1 and the 3-2, and the one end is positioned at the stiff end of substrate 2, and the width of full electrode is identical with the width of substrate, and length h is 30 ﹪～50 ﹪ of substrate length L.
Inserting finger electrode 5-1 and 5-2 is conductive metal sheet or metal film, covers respectively on piezoelectric patches 3-1 and the 3-2; Each is inserted and refers to that electrode comprises two monolateral electrodes, and each monolateral electrode comprises a plurality of parallel metal fingers, and many metals finger connects by compiling bonding jumper; The metal finger of two monolateral electrodes is crisscross arranged, and forms to insert to refer to electrode; The width a of each metal finger equates with the gap b of two adjacent metal fingers.
Full electrode 4-1 and the projection of 4-2 on substrate on substrate two sides overlap safely, and slotting finger electrode 5-1 and the projection of 5-2 on substrate on substrate two sides overlap safely.
Substrate and two full electrodes and each monolateral electrode are connected with lead-in wire.
Operation principle of the present utility model and process:
Known piezoelectric micromotor energy source electric generating device has based on d31 and two kinds of patterns of d33, and the electric charge that produces during its generating is with being described by following relational expression between the voltage:
Q=C
totalV
Total capacitance C
TotalInclude piezoelectric layer intrinsic capacity C
0With the piezoelectric response capacitor C
e
The peak power output of piezoelectric micromotor energy source electric generating device is:
R
0Be intrinsic resistance;
For the piezoelectric micromotor energy source electric generating device based on the d33 pattern, the intrinsic capacity C of its piezoelectric layer
0Can be expressed as:
Wherein
Be the thickness of piezoelectric layer,
Dielectric constant for electricity electric capacity.
For the electrode logarithm be n based on d33 call by pattern piezoelectric micromotor energy source electric generating device, the expression formula of its piezoelectric response electric capacity is:
Equally, for based on d33 call by pattern piezoelectric micromotor energy source electric generating device, the expression formula of its intrinsic resistance is:
And same, for the piezoelectric micromotor energy source electric generating device based on the d31 pattern, the intrinsic capacity C of its piezoelectric layer
0Can be expressed as:
The expression formula of its piezoelectric response electric capacity is:
The expression formula of its intrinsic resistance is:
When considering work, the skewness of strain on substrate.The strain of substrate stiff end is large, and the free end strain is minimum.The CHARGE DISTRIBUTION that causes piezoelectric patches to produce in fact also is inhomogeneous along substrate surface, and for the piezoelectric micromotor energy source electric generating device based on the d31 pattern, output power density is naturally influenced like this.Interdigital electrode is being set near the substrate free end, is carrying out the generating work based on the d33 pattern, the strain that can effectively utilize on the whole length of substrate is generated electricity, and gives full play to d31 with d33 pattern characteristics separately, improves output power density.
Because the main distortion of substrate is flexural deformation, adopt the model of Euler-bernoulli beam to analyze the distribution situation of strain on substrate.
The transverse vibration differential equation of Euler-bernoulli is:
Solving equation can obtain strain along the distribution situation of substrate.
Claims (2)
1. the little power generator of composite piezoelectric comprises pedestal, substrate, piezoelectric patches, full electrode and inserts referring to electrode, it is characterized in that:
The cross section of described pedestal is L shaped, comprises horizontal base and vertically is arranged on mount pad on the horizontal base;
The stiff end of described substrate is fixedly installed on the mount pad, free end is unsettled; Described substrate is the sheet metal of strip, adopts elastic metallic material; The two sides of substrate is respectively arranged with piezoelectric patches, the complete covered substrate of the one side of piezoelectric patches surface, and another side is provided with full electrode and inserts and refers to electrode;
Described full electrode is conductive metal sheet or metal film, covers on the piezoelectric patches, and the one end is positioned at the stiff end of substrate, and the width of full electrode is identical with the width of substrate, and length h is 30 ﹪～50 ﹪ of substrate length L;
Described slotting finger electrode is conductive metal sheet or metal film, covers on the piezoelectric patches; Each is inserted and refers to that electrode comprises two monolateral electrodes, and each monolateral electrode comprises a plurality of parallel metal fingers, and many metals finger connects by compiling bonding jumper; The metal finger of two monolateral electrodes is crisscross arranged, and forms to insert to refer to electrode; The width a of each metal finger equates with the gap b of two adjacent metal fingers;
The full electrode on substrate two sides and the projection of slotting finger electrode on substrate overlap safely.
2. the little power generator of a kind of composite piezoelectric as claimed in claim 1, it is characterized in that: the material of described substrate is phosphor bronze, the material of described piezoelectric patches is doped PZT pottery or ZnO or AlN or PVDF.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220426357 CN202797092U (en) | 2012-08-27 | 2012-08-27 | Composite piezoelectric micro power generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220426357 CN202797092U (en) | 2012-08-27 | 2012-08-27 | Composite piezoelectric micro power generator |
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| CN202797092U true CN202797092U (en) | 2013-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220426357 Withdrawn - After Issue CN202797092U (en) | 2012-08-27 | 2012-08-27 | Composite piezoelectric micro power generator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820423A (en) * | 2012-08-27 | 2012-12-12 | 杭州电子科技大学 | Combined piezoelectric micro-power generator |
| CN103532431A (en) * | 2013-10-17 | 2014-01-22 | 苏州市职业大学 | Hinged type piezoelectric energy capturing device |
| CN107870350A (en) * | 2017-12-13 | 2018-04-03 | 中国地质大学（武汉） | A kind of differential type bimorph geophone core body and piezoelectric seismometer |
-
2012
- 2012-08-27 CN CN 201220426357 patent/CN202797092U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820423A (en) * | 2012-08-27 | 2012-12-12 | 杭州电子科技大学 | Combined piezoelectric micro-power generator |
| CN103532431A (en) * | 2013-10-17 | 2014-01-22 | 苏州市职业大学 | Hinged type piezoelectric energy capturing device |
| CN107870350A (en) * | 2017-12-13 | 2018-04-03 | 中国地质大学（武汉） | A kind of differential type bimorph geophone core body and piezoelectric seismometer |
| CN107870350B (en) * | 2017-12-13 | 2023-12-15 | 中国地质大学（武汉） | Differential dual-piezoelectric-patch geophone core and piezoelectric geophone |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130313 Effective date of abandoning: 20140709 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20130313 Effective date of abandoning: 20140709 |
|
| RGAV | Abandon patent right to avoid regrant |