POWER SUPPLY AND PICKUP SYSTEM CAPABLE OF MAINTAINING STABILITY OF TRANSMISSION EFFICIENCY DESPITE CHANGES IN RESONANT FREQUENCY

• US 20140319927A1
• Filed: 09/25/2012
• Published: 10/30/2014
• Est. Priority Date: 09/26/2011
• Status: Active Grant

• Current Assignee: Korea Advanced Institute of Science and Technology
• Original Assignee: Korea Advanced Institute of Science and Technology
• Inventors: Cho, Dong Ho, Kim, Joung Ho, Chun, Yang Bae, Han, Il-Song, Ahn, Seung-Young, Kim, Eun-Jung, Ryu, Ji-Yun, Kim, Mi-Joo, Kim, Gyeng-Chul, Jeong, Gu
• Granted Patent: US 10,230,268 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: B60L 2240/36 Temperature of vehicle components or parts
• CPC Class Codes: B60L 50/51 characterised by AC-motors
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: B60L 53/36 by positioning the vehicle
• CPC Class Codes: B60L 53/39 with position-responsive activation of primary coils
• CPC Class Codes: B60L 9/28 polyphase motors
• CPC Class Codes: B60M 7/00 Power lines or rails specially adapted for electrically-propelled vehicles of special types, e.g. suspension tramway, ropeway, underground railway
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• CPC Class Codes: H01F 27/366 made of ferromagnetic material
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 50/001 Energy harvesting or scavenging
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• 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

The present invention relates to a power supply and pickup system capable of maintaining stability of transmission efficiency despite changes in a resonant frequency. More particularly, the present invention relates to a power supply and pickup system capable of maintaining the stability of efficiency of transmitting power to a pickup device from a power supply device even when a voltage or current changes by the variation in a resonant frequency. According to the power supply and pickup system of the present invention, Q-factor of a power supply and pickup system is set to a low value, a stability of efficiency of transmitting power to a pickup device from a power supply device is maintained even when a voltage of current changes by the variation in a resonant frequency.

Claims

1. For a power supply device which supplies power using magnetic induction to a moving object, said power supply device includes a power supply core with magnetic poles to form magnetic field in a particular direction;

and a power supply coil on which current flows with neighboring magnetic poles of different polarity, and a Q-factor by said power supply coil current is less than 100, said Q-factor is determined by

3. The power supply device as claim 1, wherein the section perpendicular to the traveling direction of a moving object of said magnetic pole may have a U-shaped form and said power supply coil may be arranged in parallel to the traveling direction of a moving object in said U-shaped magnetic pole.

2. For a power supply device which supplies power using electromagnetic induction to a moving object, said power supply device includes a power supply core which has multiple magnetic poles in parallel to a traveling direction of the moving object and arranged side by side with each other, and a power supply coil which is arranged by extension in the traveling direction of the moving body and has electricity flow so that the neighboring magnetic poles of said power supply core on the surface perpendicular to the traveling direction of the moving object have different polarity, and said Q-factor by said power supply coil current is less than 100 and the Q-factor is determined by

4. The power supply device as claim 2, wherein the section perpendicular to the traveling direction of a moving object of said magnetic pole may have two U-shaped forms adjoining each other and said power supply coil may be arranged in parallel to the traveling direction of a moving object in each of said U-shaped magnetic poles.

5. The power supply device as claim 2, wherein said power supply core may have a form in which power supply modules having multiple magnetic poles in parallel to the traveling direction of a moving object and arranged side by side with each other are arranged in series in the traveling direction of a moving object.

6. For a power supply which supplies power using electromagnetic induction to a moving object, said power supply device includes a power supply core which has more than one magnetic pole arranged in series in the traveling direction of a moving body, and a power supply coil which is arranged in parallel to the traveling direction of a moving body on the left and right side of said magnetic poles and intersected with each other between said magnetic poles and has electricity flow so that the neighboring magnetic poles of said power supply core in the traveling direction of a moving object have different polarity, and a Q-factor by said power supply coil current is less than 100, and said Q-factor is determined by

7. The power supply device as claim 6, wherein the section perpendicular to the traveling direction of a moving object of said magnetic pole has a T-shaped form, it is desirable that said power supply coil is arranged in parallel to the traveling direction of a moving object in the left and right side of each of said magnetic poles and intersected with each other between said magnetic poles and electricity of opposite directions flows on said power supply coils in the left and right side of each of said magnetic poles.

8. The power supply device as claim 6, wherein said power supply device has an additional linear magnetic shield member installed in the traveling direction.

9. The power supply device as claim 6, wherein said power supply core may be of such a form that power supply modules which have one or more magnetic poles arranged in series in the traveling direction of a moving object are arranged to make lines in series in the traveling direction of a road.

10. The power supply device as claim 9, wherein each of said power supply modules has core connection part in the front and rear ends and each of the power supply core modules may be connected to each other by said core connection part and arranged to make lines in series in the traveling direction of a road.

11. The power supply device as claim 9, wherein said power supply cores are arranged spaced apart from each other to accept thermal expansion and thermal contraction.

12. The power supply device as claim 9, wherein said power supply core has fiber reinforced plastic which is installed in the upper or lower part.

13. The power supply device as claim 6, wherein said power supply core has the width perpendicular to the traveling direction of a moving object less than one half of the interval between the centers of said magnetic poles.

14. The power supply device as claim 6, wherein the length of said magnetic pole in the traveling direction of a moving object is more than twice of the distance between the adjoining ends of said neighboring magnetic poles.

15. For a pickup device which receives power using electromagnetic induction from a power supply device installed in the traveling direction of a moving object and is installed in a moving object, including a pickup core which is installed spacing apart from a power supply device in the lower part of a moving object, and a pickup coil which is installed in a loop form in said pickup core to allow current induced from a power supply device to flow, and Q-factor by said pickup coil current is less than 100 and said Q-factor is determined by

16. The pickup device as claim 15, wherein said pickup core is of a plate form or lattice form.

17. The pickup device as claim 15, wherein said pickup device has an additional loop-type magnetic shield member installed around a pickup core.