Dielectric materials for power transfer system

• US 8,968,609 B2
• Filed: 05/12/2010
• Issued: 03/03/2015
• Est. Priority Date: 05/12/2010
• Status: Active Grant

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Krishna, Kalaga Murali, Chakraborty, Jay, Bohori, Adnan Kutubuddin, Bhat, Suma Memana Narayana, Ramachandrapanicker, Somakumar, Matani, Lohit
• Primary Examiner(s): Silverman, Stanley
• Assistant Examiner(s): VIJAYAKUMAR, KALLAMBELLA M
• Application Number:
  US12/778,189
• Publication Number:
  US 20110278941A1
• Time in Patent Office: 1,756 Days
• Field of Search: 252/500, 252/520.12, 252/520.2, 252/62.9 PZ, 501136-139, 307/104, 307/9.1, 307/64, 307/31, 290/1.R, 333/219, 333/219.1, 361/230, 361/311, 361/524
• US Class Current: 252/520.21
• CPC Class Codes: C01G 23/003 Titanates C01G23/001 takes precedence
• CPC Class Codes: C01G 23/006 Alkaline earth titanates
• CPC Class Codes: C01P 2002/52 containing elements as dopants
• CPC Class Codes: C01P 2006/40 Electric properties
• CPC Class Codes: C04B 2235/3208 Calcium oxide or oxide-forming salts thereof, e.g. lime
• CPC Class Codes: C04B 2235/3213 Strontium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3215 Barium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3217 Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
• CPC Class Codes: C04B 2235/3227 Lanthanum oxide or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3234 Titanates, not containing zirconia
• CPC Class Codes: C04B 2235/3241 Chromium oxides, chromates, or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3244 Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3281 Copper oxides, cuprates or oxide-forming salts thereof, e.g. CuO or Cu2O
• CPC Class Codes: C04B 2235/3298 Bismuth oxides, bismuthates or oxide forming salts thereof, e.g. zinc bismuthate
• CPC Class Codes: C04B 2235/40 Metallic constituents or additives not added as binding phase
• CPC Class Codes: C04B 2235/445 Fluoride containing anions, e.g. fluosilicate
• CPC Class Codes: C04B 2235/483 Si-containing organic compounds, e.g. silicone resins, (poly)silanes, (poly)siloxanes or (poly)silazanes
• CPC Class Codes: C04B 2235/604 Pressing at temperatures other than sintering temperatures
• CPC Class Codes: C04B 2235/656 characterised by specific heating conditions during heat treatment
• CPC Class Codes: C04B 2235/6567 Treatment time
• CPC Class Codes: C04B 2235/658 : Atmosphere during thermal treatment
• CPC Class Codes: C04B 2235/6582 : Hydrogen containing atmosphere
• CPC Class Codes: C04B 2235/6585 : at an oxygen percentage above that of air
• CPC Class Codes: C04B 2235/768 : Perovskite structure ABO3
• CPC Class Codes: C04B 2235/77 : Density
• CPC Class Codes: C04B 2235/80 : Phases present in the sintered or melt-cast ceramic products other than the main phase
• CPC Class Codes: C04B 2235/85 : Intergranular or grain boundary phases
• CPC Class Codes: C04B 35/462 : based on titanates
• CPC Class Codes: C04B 35/465 : based on alkaline earth metal titanates
• CPC Class Codes: C04B 35/4682 : based on BaTiO3 perovskite phase
• CPC Class Codes: C04B 35/47 : based on strontium titanates
• CPC Class Codes: C04B 35/632 : Organic additives
• CPC Class Codes: H01F 38/14 : Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10

Abstract

A contactless power transfer system is proposed. The power transfer system comprises a field-focusing element comprising a dielectric material. The dielectric material comprises a composition that is selected from the family of (Ba,Sr)TiO₃ or CaCu₃Ti₄O₁₂. The compositions of the (Ba,Sr)TiO₃ include the materials such as Ca_1-x-yBa_xSr_yTi_1-zCr_zO_3-δN_p, wherein 0<x<1; 0<y<1; 0≦z≦0.01; 0≦δ≦1; and 0≦p≦1. The compositions of the CaCu₃Ti₄O₁₂ include the materials such as Ca_1-x-yBa_xSr_y (Ca_1-zCu_z)Cu₂Ti_4-δAl_δO_12-0.5δ, wherein 0≦x<0.5; 0≦y<0.5; 0≦z≦1; and 0≦δ≦0.1.

Claims

1. A power transfer system comprising:

a first coil coupled to a power source;

a second coil coupled to a load; and

a field-focusing element disposed between the first coil and the second coil and comprising a dielectric material, wherein the dielectric material comprises Ca_1-x-yBa_xSr_y(Ca_1-zCu_z)Cu₂T_4-δ

Al_δ

O_12-0.5δ

,

wherein 0≦

x, y<

0.5;

0≦

z≦

1; and

0≦

δ

≦

0.1.

2. The system of claim 1, wherein at least one of x and y is greater than 0 when δ

=0.

3. The system of claim 1, wherein x and y are both greater than 0 when δ

=0.

4. The system of claim 3, wherein x and y are both greater than 0 and z=1 when δ

=0.

5. The system of claim 4, wherein the dielectric material comprises Ba_0.01Sr_0.2Ca_0.79Cu₃Ti₄O₁₂.

6. The system of claim 1, wherein x, y, and z are all equal to 0 and δ

>

0.

7. The system of claim 6, wherein the dielectric material comprises Ca₂Cu₂Ti_3.94Al_0.06O_11.97.

8. The system of claim 1, wherein x+y≦

0.3.

9. The system of claim 1, wherein δ

≦

0.6.

10. The system of claim 1, wherein the dielectric material further comprises zirconium.

11. The system of claim 10, wherein the dielectric material comprises Ca₂Cu₂Ti_3.99Zr_0.01O₁₂.

12. The system of claim 1, wherein the dielectric material further comprises lanthanum.

13. The system of claim 1, wherein the dielectric material is a polycrystalline material comprising grains and grain boundaries.

14. The system of the claim 1, wherein the system further comprises a first coil coupled to a power source and spaced apart from the field-focusing element.

15. The system of the claim 14, wherein the system further comprises a second coil coupled to a load and spaced apart from the field-focusing element.

16. The system of the claim 15, wherein the field-focusing element is disposed between the first coil and second coil.

17. A power transfer system comprising:

a first coil coupled to a power source;

a second coil coupled to a load; and

a field-focusing element disposed between the first coil and the second coil and comprising a dielectric material, wherein the dielectric material comprises Ca_1-x-yBa_xSr_yCu₃Ti₄O₁₂,

wherein 0<

x<

0.2 and 0<

y<

0.2.

18. The power transfer system of claim 17, wherein the field-focusing element comprises a plurality of resonators.

19. A power transfer system comprising:

a first coil coupled to a power source;

a second coil coupled to a load; and

a field-focusing element disposed between the first coil and the second coil and comprising a dielectric material, wherein the dielectric material comprises Ca_2-x-yBa_xSr_y Cu₂Ti_4-δ

Al_δ

O_12-0.5δ

,

wherein 0≦

x<

0.2;

0≦

y<

0.2; and

0<

δ

≦

0.1.

20. The power transfer system of claim 19, wherein the field-focusing element comprises a plurality of resonators.