Piezoelectric power generator for feeding emergency power

• US 8,680,750 B2
• Filed: 03/29/2011
• Issued: 03/25/2014
• Est. Priority Date: 12/23/2010
• Status: Active Grant

• Current Assignee: Korea Electronics Technology Institute (Government of South Korea)
• Original Assignee: Korea Electronics Technology Institute (Government of South Korea)
• Inventors: Lee, Hyeung-Gyu, Lee, Woo Sung, Han, Seung Ho, Yoo, Chan Sei, Park, Hwi Yeol, Kang, Hyung Won
• Primary Examiner(s): ROSENAU, DEREK JOHN
• Application Number:
  US13/074,277
• Publication Number:
  US 20120161583A1
• Time in Patent Office: 1,092 Days
• Field of Search: 310/339
• US Class Current: 310/339
• CPC Class Codes: H02N 2/186 Vibration harvesters
• CPC Class Codes: H10N 30/30 with mechanical input and electrical output, e.g. functioning as generators or sensors

Abstract

A piezoelectric power generator for feeding emergency power, includes a frame; a fixing unit comprising a left fixing body coupled to an upper left side of the frame and a right fixing body coupled to an upper right part of the frame; a first piezoelectric body bonded to a right side of the left fixing body; a second piezoelectric body bonded to a left side of the right fixing body; and a vibration unit bonded between the first piezoelectric body and the second piezoelectric body and vibrating vertically.

Claims

1. A piezoelectric power generator for feeding emergency power, comprising:

a frame;

a fixing unit comprising a left fixing body coupled to a left part of the frame and a right fixing body coupled to a right part of the frame;

a first piezoelectric body attached to a right part of the left fixing body;

a second piezoelectric body attached to a left part of the right fixing body;

a vibration unit attached between the first piezoelectric body and the second piezoelectric body and configured to vibrate transversly to a direction extending between the right and left parts of the frame, wherein the vibration unit includes a Printed Circuit Board (PCB);

first and second masses respectively disposed inside an upper part and a lower part of the frame and configured to move vertically in the upper part and the lower part of the frame;

a first elastic unit connected between the first mass and a top end of the vibration unit; and

a second elastic unit connected between the second mass and a bottom end of the vibration unit.

2. The piezoelectric power generator of claim 1, wherein the elastic unit includes an elastic wire or a spring.

3. The piezoelectric power generator of claim 1, further comprising:

an electrode unit connected to the first piezoelectric body and the second piezoelectric body.

4. A piezoelectric power generator assembly, comprising two or more piezoelectric power generators of claim 1,

wherein the piezoelectric power generators are stacked on top each other, a vibrating direction of the vibration unit of one of the piezoelectric power generators crossing a vibrating direction of the vibration unit of another one of the piezoelectric power generators at 90 degrees.

5. The piezoelectric power generator of claim 1, further comprising:

a case unit for covering an exterior of the piezoelectric power generator.

6. A portable electronic device, comprising the piezoelectric power generator of claim 1, wherein the piezoelectric power generator is mounted inside or outside the portable electronic device, and

the portable electronic device is configured to receive at least part of power generated by vibrations of the vibrating unit from the piezoelectric power generator.

7. A piezoelectric power generator for feeding emergency power, comprising:

a frame comprising an exterior unit and a partition unit, the partition unit projecting and extending in a direction from an upper part of the exterior unit to a lower part of the exterior unit and dividing an inner space of the exterior unit;

a first piezoelectric body disposed between a left part of the exterior unit and a left part of the partition unit;

a second piezoelectric body disposed between a right part of the exterior unit and a right part of the partition unit;

a vibration unit configured to vibrate in said direction inside the partition unit, wherein the vibration unit includes a Printed Circuit Board (PCB);

first and second masses respectively disposed inside an upper part and a lower part of the frame and configured to move vertically in the upper part and the lower part of the frame;

a first elastic unit connected between the first mass and a top end of the vibration unit; and

a second elastic unit connected between the second mass and a bottom end of the vibration unit.

8. The piezoelectric power generator of claim 7, further comprising more than one pairs of the first and second piezoelectric bodies.

9. The piezoelectric power generator of claim 7, wherein the vibration unit is comprises one or more selected from the group consisting of tungsten (W), gold (Au), and Bismuth (Bi).

10. The piezoelectric power generator of claim 7, further comprising:

an electrode unit connected to the first piezoelectric body and the second piezoelectric body.

11. A piezoelectric power generator assembly, comprising two or more piezoelectric power generators of claim 7,

wherein the piezoelectric power generators are stacked on top each other, a vibrating direction of the vibration unit of one of the piezoelectric power generators crossing a vibrating direction of the vibration unit of another one of the piezoelectric power generators at 90 degrees.

12. The piezoelectric power generator of claim 7, further comprising:

a case unit for covering an exterior of the piezoelectric power generator.