ELECTRIC POWER TRANSMISSION SYSTEM

• US 20150123485A1
• Filed: 08/30/2013
• Published: 05/07/2015
• Est. Priority Date: 09/28/2012
• Status: Active Grant

• Current Assignee: Equos Research Co., Ltd. (Aisin Corp.)
• Original Assignee: Equos Research Co., Ltd. (Aisin Corp.)
• Inventors: Yamakawa, Hiroyuki, Ito, Yasuo, Sato, Kenichiro
• Granted Patent: US 9,866,068 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• 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: B60L 53/66 Data transfer between charging stations and vehicles
• CPC Class Codes: H01F 27/2823 Wires H01F27/2866 takes precedence
• CPC Class Codes: H01F 27/2871 Pancake coils
• CPC Class Codes: H01F 3/10 Composite arrangements of magnetic circuits
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01F 5/02 wound on non-magnetic supports, e.g. formers
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• 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: 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 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00302 Overcharge protection
• 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
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles

Abstract

An electric power transmission system may include: a power transmission antenna that constitutes a series resonator with an inductance component of L1 and a capacitance component of C1, and to which AC power is input; a power receiving antenna that constitutes a series resonator with an inductance component of L2 and a capacitance component of C2, and which receives electromagnetic energy from the power transmission antenna via electromagnetic fields; a rectifying unit that rectifies an output of the power receiving antenna to output DC power; and a load to which an output of the rectifying unit is input, wherein, when a coupling coefficient between the power transmission antenna and the power receiving antenna is k, if load resistance value R is used in a range that satisfies Rmin≦R≦Rmax, the following relationships are established:

$\begin{array}{cc}{L}_1C_1=L_2C_2\mathrm{and}& \left(2\right)\\ \frac{L_1}{C_1}>\frac{L_2}{C_2}\mathrm{and}& \left(6\right)\\ R_{min}\le k\sqrt{\frac{L_2}{C_2}}\le R_{m\mathrm{ax}}& \left(8\right)\end{array}$

Claims

1. An electric power transmission system, comprising:

a power transmission antenna that constitutes a series resonator with an inductance component of L₁ and a capacitance component of C₁, and to which AC power is input;

a power receiving antenna that constitutes a series resonator with an inductance component of L₂ and a capacitance component of C₂, and which receives electromagnetic energy from the power transmission antenna via electromagnetic fields;

a rectifying unit that rectifies an output of the power receiving antenna to output DC power; and

a load to which an output of the rectifying unit is input, wherein

at times including when a coupling coefficient between the power transmission antenna and the power receiving antenna is k, if load resistance value R is used in a range that satisfies R_min≦

R≦

R_max, the following relationships are established;

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

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

the power transmission antenna is non-directional.

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

the power receiving antenna is directional.

3. An electric power transmission system, comprising:

a power transmission antenna that constitutes a series resonator with an inductance component of L₁ and a capacitance component of C₁, and to which AC power is input;

a power receiving antenna that constitutes a series resonator with an inductance component of L₂ and a capacitance component of C₂, and which receives electromagnetic energy from the power transmission antenna via electromagnetic fields;

a rectifying unit that rectifies an output of the power receiving antenna to output DC power; and

a load to which an output of the rectifying unit is input, wherein

at times including when a coupling coefficient between the power transmission antenna and the power receiving antenna is k,

if there are n modes in which different values of electric power are used to transmit electric power from the power transmission antenna to the power receiving antenna,

if a load resistance value during transmission of electric power in a h^th mode (h=1, 2, . . . , n) is R_h, and

if a maximum resistance value R_h is represented by R_hmax and a minimum resistance value R_h by R_hmin, the following relationships are established;

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