ELECTRIC POWER TRANSMISSION SYSTEM AND ANTENNA

• US 20120217819A1
• Filed: 10/24/2011
• Published: 08/30/2012
• Est. Priority Date: 10/27/2010
• Status: Abandoned Application

• Current Assignee: Equos Research Co., Ltd. (Aisin Corp.)
• Original Assignee: Equos Research Co., Ltd. (Aisin Corp.)
• Inventors: YAMAKAWA, Hiroyuki, ITO, Yasuo, GORAI, Naoki, MIYAGI, Kei, SUGAWARA, Takashi, SHIMOKAWA, Shigenori
• Application Number:
  US13/279,648
• Publication Number:
  US 20120217819A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: B60L 53/124 Detection or removal of foreign bodies
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/00304 Overcurrent protection
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

An electric power transmission system includes: a transmitting-side system that includes switching elements that convert a direct-current voltage to an alternating-current voltage and that output the alternating-current voltage and a transmitting-side magnetic resonance antenna unit that has a first inductor and a first capacitor directly coupled to each other and to which the output alternating-current voltage is input; and a receiving-side system that includes a second inductor and a second capacitor directly coupled to each other and that resonates with the transmitting-side magnetic resonance antenna unit via electromagnetic field to thereby receive electric energy output from the transmitting-side magnetic resonance antenna unit.

Claims

1. An electric power transmission system comprising:

a transmitting-side system that includes;

switching elements that convert a direct-current voltage to an alternating-current voltage and that output the alternating-current voltage; and

a transmitting-side magnetic resonance antenna unit that includes a first inductor and a first capacitor directly coupled to each other and to which the output alternating-current voltage is input; and

a receiving-side system that includes;

a receiving-side magnetic resonance antenna unit that has a second inductor and a second capacitor directly coupled to each other and that resonates with the transmitting-side magnetic resonance antenna unit via electromagnetic field to thereby receive electric energy output from the transmitting-side magnetic resonance antenna unit.

2. The electric power transmission system according to claim 1, wherein

the switching elements constitute an inverter circuit, and

the transmitting-side magnetic resonance antenna unit is directly coupled to the inverter circuit.

3. The electric power transmission system according to claim 1, wherein

the receiving-side system further includes a rectifier that rectifies an output from the receiving-side magnetic resonance antenna unit, and

the receiving-side magnetic resonance antenna unit is directly coupled to the rectifier.

4. The electric power transmission system according to claim 1, wherein

the transmitting-side magnetic resonance antenna unit oscillates by resonance between the first inductor and the first capacitor, and

the receiving-side magnetic resonance antenna unit receives electric energy from the transmitting-side magnetic resonance antenna unit by resonance between the second inductor and the second capacitor.

5. The electric power transmission system according to claim 1, wherein

the first inductor of the transmitting-side magnetic resonance antenna unit and the second inductor of the receiving-side magnetic resonance antenna unit have the same inductive component, and

the first capacitor of the transmitting-side magnetic resonance antenna unit and the second capacitor of the receiving-side magnetic resonance antenna unit have the same capacitive component.

6. The electric power transmission system according to claim 1, wherein the switching elements convert a direct-current voltage to a rectangular wave alternating-current voltage and output the rectangular wave alternating-current voltage.

7. The electric power transmission system according to claim 1, wherein the switching elements constitute a half-bridge inverter.

8. The electric power transmission system according to claim 7, wherein the inverter operates in a voltage mode.

9. The electric power transmission system according to claim 1, wherein the switching elements constitute a full-bridge inverter.

10. The electric power transmission system according to claim 9, wherein the inverter operates in a voltage mode.

11. The electric power transmission system according to claim 1, wherein the transmitting-side magnetic resonance antenna unit and the receiving-side magnetic resonance antenna unit resonate with each other at a frequency of several hundreds of kHz to several thousands of kHz to thereby cause the receiving-side magnetic resonance antenna unit to receive electric energy output from the transmitting-side magnetic resonance antenna unit.

12. An electric power transmission system comprising:

a transmitting-side system that includes;

switching elements that convert a direct-current voltage to an alternating-current voltage and that output the alternating-current voltage; and

a transmitting-side magnetic resonance antenna unit to which the output alternating-current voltage is input; and

a receiving-side system that includes;

a receiving-side magnetic resonance antenna unit that resonates with the transmitting-side magnetic resonance antenna unit via electromagnetic field to thereby receive electric energy output from the transmitting-side magnetic resonance antenna unit, wherein

the transmitting-side magnetic resonance antenna unit includes a first inductor having a predetermined inductive component and a first capacitor having a predetermined capacitive component,

the inductive component of the transmitting-side magnetic resonance antenna unit is larger than or equal to 50 μ

H and smaller than or equal to 500 μ

H, and

the capacitive component of the transmitting-side magnetic resonance antenna unit is larger than or equal to 200 pF and smaller than or equal to 3000 pF.

13. The electric power transmission system according to claim 12, wherein a coupling coefficient between the transmitting-side magnetic resonance antenna unit and the receiving-side magnetic resonance antenna unit is smaller than or equal to 0.3.

14. An antenna comprising:

a base having a first surface and a second surface that is a back in relation to the first surface;

a first surface electrically conductive portion that is formed on the first surface of the base and that forms a coil; and

a capacitor that is connected to the coil and that is placed on the first surface.

15. The antenna according to claim 14, wherein

the first surface electrically conductive portion has a first surface innermost end portion and a first surface outermost end portion, and

the capacitor is connected to the first surface outermost end portion of the first surface electrically conductive portion that forms the coil.

16. The antenna according to claim 15, further comprising:

a second surface electrically conductive portion that is formed on the second surface of the base, that has a second surface innermost end portion and a second surface outermost end portion, that forms a coil and that overlaps with the first surface electrically conductive portion when viewed transparently from the first surface to the second surface;

a first through-hole conducting portion that penetrates between the first surface and the second surface to conductively connect the first surface innermost end portion to the second surface innermost end portion; and

a second through-hole conducting portion that penetrates between the first surface and the second surface to conductively connect the first surface outermost end portion to the second surface outermost end portion.

17. The antenna according to claim 14, wherein a dielectric material of the capacitor contains at least one selected from the group consisting of a titanium oxide, magnesium titanate, barium titanate and a steatite material.

18. The antenna according to claim 14, wherein the base and the capacitor are accommodated in a common case.

19. An antenna comprising:

at least two laminated bases;

a plurality of electrically conductive portions, each of which has an innermost end portion and an outermost end portion and forms a coil, wherein adjacent two of the plurality of electrically conductive portions are laminated via a corresponding one of the at least two bases;

a capacitor that is connected to the outermost end portion of an exposed one of the at least two bases and that is placed on the exposed base;

a first through-hole conducting portion that penetrates the at least two bases to conductively connect the innermost end portions of the respective electrically conductive portions to one another; and

a second through-hole conducting portion that penetrates the at least two bases to conductively connect the outermost end portions of the respective electrically conductive portions to one another, wherein

the plurality of electrically conductive portions all overlap one another when viewed transparently in a direction in which the plurality of electrically conductive portions are laminated.

20. The antenna according to claim 19, wherein a dielectric material of the capacitor contains at least one selected from the group consisting of a titanium oxide, magnesium titanate, barium titanate and a steatite material.

21. The antenna according to claim 19, wherein the base and the capacitor are accommodated in a common case.

22. An antenna comprising:

an electrically conductive portion that has an innermost end portion and an outermost end portion and that forms a spiral coil; and

a capacitor that is fixed to the outermost end portion.

23. The antenna according to claim 22, wherein a dielectric material of the capacitor contains at least one selected from the group consisting of a titanium oxide, magnesium titanate, barium titanate and a steatite material.

24. The antenna according to claim 22, wherein the base and the capacitor are accommodated in a common case.

25. An antenna comprising:

a base;

an electrically conductive portion that is formed on one surface of the base, that has an innermost end portion and an outermost end portion and that forms a coil; and

a capacitor that is fixed to the outermost end portion.

26. The antenna according to claim 25, wherein a dielectric material of the capacitor contains at least one selected from the group consisting of a titanium oxide, magnesium titanate, barium titanate and a steatite material.

27. The antenna according to claim 25, wherein the base and the capacitor are accommodated in a common case.