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Piezoelectric Generators Having an Inductance Circuit For Munitions Fuzing and the Like

a technology of inductance circuit and munitions fuzing, which is applied in the direction of generator/motor, electric fuze, ammunition fuze, etc., and can solve the problems of requiring the allocation of valuable space, not cost-effective use of reserve batteries for such low power requirements, and affecting the safety of personnel

Inactive Publication Date: 2009-06-25
OMNITEK PARTNERS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides new methods for developing devices that can sustain the firing acceleration and other similar impact force induced charges generated in piezoelectric elements for longer periods of time. This allows for the generation of significantly more power from the piezoelectric elements. The invention also provides devices that can increase the amount of time available to harvest the generated charges. The piezoelectric generator comprises a piezoelectric member capable of producing an output power, means for applying a force to the piezoelectric member due to the acceleration, means for sustaining a strain in the piezoelectric member resulting from the applied force, and an inductor electrically connected to the piezoelectric member for forming an oscillating circuit. The technical effects of the invention include increased power output and improved efficiency of piezoelectric generators.

Problems solved by technology

The use of reserve batteries for such very low power requirements is not cost effective and requires the allocation of valuable space and may face safety issues.
Current applications of piezoelectric elements of various designs and configurations such as stacks of piezoelectric ceramic, film layers, etc. which are loaded (strained) due to the firing acceleration in the axial direction, in bending, etc. and which may be equipped with appropriate inertial components to increase the generated loads (axial, bending, torsional, etc.), or are equipped with motion amplifying mechanisms to amplify the applied stains, have a common shortcoming that reduces their effectiveness as electrical energy generators and prevents efficient collection and storage of the generated charges.
As a result, the window for extraction and storage of the generated electrical charge is equally small, making efficient harvesting of the generated charge very difficult.

Method used

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  • Piezoelectric Generators Having an Inductance Circuit For Munitions Fuzing and the Like
  • Piezoelectric Generators Having an Inductance Circuit For Munitions Fuzing and the Like
  • Piezoelectric Generators Having an Inductance Circuit For Munitions Fuzing and the Like

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embodiment 50

[0050]In general, the position of the traveling wedging element(s) may be exchanged, for example, in the embodiment of FIG. 6, the piezoelectric stack 41 (51 in FIG. 7) and its two sides wedging elements 44 (52 in FIG. 7) may be set against the munitions structure 12 as shown in FIG. 7. In this embodiment 50, the supports 42 (53 in FIG. 7) are then joined together by the relatively rigid backing 54, and positioned as shown in FIG. 7 over the piezoelectric slack assembly. The piezoelectric stack is held against the munitions structure surface 12, but is allowed to expand and / or contract. As the munitions is fired, the acceleration of the munitions in the direction of the arrow 14 would act on the mass of the assembly of the elements 53 and the backing 54, thereby applying a compressive force on the piezoelectric stack 1 via the side wedges 52. With an appropriate wedging angle of the surfaces 55, the assembly of the piezoelectric stack 51 and the blocks 52 is locked in place relative...

embodiment 60

[0052]It is noted that even though in the embodiments shown in FIGS. 2-7 the piezoelectric layers are stacked in planes perpendicular to the direction of the applied compressive loads, the compressive loads may be applied to similar layers stacked in numerous other configurations. For example, in one embodiment 60, the layers 66 may be stacked to form a cone segment 61, which can have an inside hole 62 as shown in the schematic of longitudinal cross-sectional view in FIG. 8a (shown with ring 63). The layers are shown in the top view of piezoelectric element 61 in FIG. 8b (without ring 63). The cone angle is indicated as 65. A ring 63 with a matching inside cone angle is used as the support element attached to the munitions structure 12. During the firing, the firing acceleration in the direction 14 acts on the mass of the piezoelectric element 61, thereby wedging it inside the ring 63. An additional mass 64 may be used to increase the generated compressive force. With an appropriate...

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Abstract

A piezoelectric generator for generating power from an acceleration is provided. The piezoelectric generator including: a piezoelectric member capable of producing an output power; means for applying a force to the piezoelectric member due to the acceleration; means for sustaining a strain in the piezoelectric member resulting from the applied force; and an inductor electrically connected to the piezoelectric member for forming an oscillating circuit.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a Continuation application of U.S. application Ser. No. 11 / 998,925 filed on Dec. 3, 2007 which claims the benefit of provisional application Ser. No. 60 / 872,248 filed on Dec. 2, 2006, the contents of each of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates generally to piezoelectric generators and, more particularly, to piezoelectric generators for munitions fuzing.[0004]2. Prior Art[0005]All existing and future smart and guided gun-fired munitions and mortars that are equipped with electronics for fuzing or other similar purposes require electric power for their operation. The amount of power required for proper operation of certain components in gun-fired munitions, for example for the operation of certain fuzing electronics, is small enough to be provided by harvesting the electric charge generated directly from piezoelectric eleme...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01L41/00H10N30/00
CPCH02N2/18F42C11/008
Inventor RASTEGAR, JAHANGIR S.SPINELLI, THOMAS
Owner OMNITEK PARTNERS LLC
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