Process of generating power from hard disk vibration in data centers

• US 8,922,097 B2
• Filed: 09/19/2011
• Issued: 12/30/2014
• Est. Priority Date: 09/19/2011
• Status: Active Grant

• Current Assignee: TATA Consultancy Services Limited (Tata Sons Pvt Ltd.)
• Original Assignee: TATA Consultancy Services Limited (Tata Sons Pvt Ltd.)
• Inventors: Vijayakumar, Senthilkumar
• Primary Examiner(s): DOUGHERTY, THOMAS M
• Application Number:
  US13/236,044
• Publication Number:
  US 20130069486A1
• Time in Patent Office: 1,198 Days
• Field of Search: 310/338, 310/339
• US Class Current: 310/339
• CPC Class Codes: H02N 2/186 Vibration harvesters

Abstract

The present invention relates to an energy harvesting apparatus capable of converting small magnitude low frequency vibrational energy into useful electrical energy that may be stored and used to power microelectronic devices and rechargeable battery technologies. The energy harvesting apparatus utilizes a piezoelectric device coupled to a pneumatic controller for modulating the vibrational energy received from vibrational energy source into a useful alternating energy waveform. A rectifier is further coupled to the piezoelectric device for converting alternating electrical energy to direct current energy for supporting associated external circuitry.

Claims

1. A vibrational energy harvesting apparatus comprising:

a transducer (102) configured to;

sense vibrational energy generated by a vibrational energy source (101), and

convert the vibrational energy into a transducer signal, wherein the transducer signal indicates an electrical signal generated in proportion to the vibrational energy;

an electronic amplifier (103) configured to;

amplify the transducer signal, wherein the transducer signal amplified is in a form of a distorted square waveform;

an optocoupler (104) configured to;

receive the transducer signal in the form of the distorted square waveform, and

reduce distortions from the amplified transducer signal to generate a first electrical signal form; and

a pneumatic controller (105) configured to receive the first electrical signal form, wherein the pneumatic controller (105) has a piston arrangement (109) coupled with an array of piezoelectric sensors (106), wherein the pneumatic controller (105) moves and pushes the piston arrangement (109) by using the first electrical signal form in order to generate a pneumatic stress upon each piezoelectric sensor of the array of piezoelectric sensors (106), and wherein

each piezoelectric sensor generates a second electrical signal form in response to the pneumatic stress, wherein the second electrical signal form is a representative of an electrical energy.

2. The vibrational energy harvesting apparatus of claim 1, wherein the transducer signal is generated, by the transducer (102), of a magnitude varying in a range of 70-95 mV.

3. The vibrational energy harvesting apparatus of claim 1, wherein the electronic amplifier (103) amplifies the transducer signal to a magnitude varying in a range of 2-3V.

4. The vibrational energy harvesting apparatus of claim 1, the vibrational energy harvesting apparatus further comprising:

a cascade amplifier (108) integrated with the array of piezoelectric sensors (106), wherein the cascade amplifier (108) amplifies the second electrical signal form to a magnitude varying in the range of 3-5V.

5. The vibrational energy harvesting apparatus of claim 1, the vibrational energy harvesting apparatus further comprising:

a diode bridge rectifier (110) and a capacitor (111), wherein the diode bridge rectifier (110) is configured to convert the second electrical signal form to DC voltage output, and wherein the capacitor (111) is configured to store the DC voltage output.

6. The vibrational energy harvesting apparatus of claim 1, wherein the pneumatic stress generated upon each piezoelectric sensor (106) is in a range of 75 psi-100 psi.

7. The vibrational energy harvesting apparatus of claim 1, wherein the piston arrangement (109) comprises a piston of diameter in a range of 0.375 inches to 1.5 inches, and a thickness of 0.008 inches.

8. The vibrational energy harvesting apparatus of claim 1, wherein the second electrical signal form is generated, by each piezoelectric sensor, in a square waveform of amplitude in a range of 3-5V.

9. The vibrational energy harvesting apparatus of claim 1, wherein the piezoelectric sensor is formed of piezoelectric element selected from a group comprising piezoelectric ceramics, piezoelectric single crystals, piezoelectric polymers, and piezoelectric composites.

10. A method of harvesting energy from a vibrational energy source, the method comprising:

sensing, by a transducer (102), vibrational energy generated from a vibrational energy source (101);

converting, by the transducer (102), the vibrational energy into a transducer signal, wherein the transducer signal generated is proportionate to the vibrational energy;

amplifying, by an electronic amplifier (103), the transducer signal, wherein the transducer signal amplified is in a form of distorted square waveform;

receiving, by an octocoupler (104), the transducer signal in the form of the distorted square waveform, wherein the octocoupler (104) reduces distortion from the amplified transducer signal to generate a first electrical signal form; and

receiving, by a pneumatic controller (105) having a piston arrangement (109) coupled with an array of piezoelectric sensors (106), the first electrical signal form, wherein the pneumatic controller (105) moves and pushes the piston arrangement (109), by using the first electrical signal form, in order to generate pneumatic stress upon each piezoelectric sensor of the array of piezoelectric sensors (106), and wherein each piezoelectric sensor generates a second electrical signal form in response to the pneumatic stress, wherein the second electrical signal form is a representative of an electrical energy.

11. The method of claim 10, wherein the transducer signal is generated, by the transducer (102), of a magnitude varying in a range of 70-90 mV.

12. The method of claim 10, wherein the electronic amplifier (103) amplifies the transducer signal to a magnitude varying in a range of 2-3 V.

13. The method of claim 10, wherein the pneumatic stress generated upon the each piezoelectric sensor (106) is in a range of 75 psi-100 psi.

14. The method of claim 10, wherein the second electrical signal form is generated, by each piezoelectric sensor, in a square waveform of magnitude varying from 3-5V.