POWER TRANSMISSION SYSTEM

• US 20170106759A1
• Filed: 03/13/2015
• Published: 04/20/2017
• Est. Priority Date: 05/07/2014
• Status: Active Grant

• Current Assignee: Equos Research Co., Ltd. (Aisin Corp.), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Equos Research Co., Ltd. (Aisin Corp.), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: ICHIKAWA, Shinji, GORAI, Naoki, YAMAKAWA, Hiroyuki, SATO, Kenichiro
• Granted Patent: US 10,608,478 B2
• Time in Patent Office: Days
• 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 50/70 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 50/90 involving detection or optimisation of position, e.g. alignment
• 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

A power transmission system transmits electric energy to a secondary resonator having a secondary resonator coil through an electromagnetic field of a predetermined frequency from a resonator having a resonator coil and reduces noise using two noise cancellation resonators with one predetermined frequency and its higher harmonic component set as noise reduction target frequency. The system includes, as two noise cancellation resonators, a first noise cancellation resonator including a first noise cancellation resonator coil and has a resonance frequency higher than the noise reduction target frequency by a first shift frequency determined according to a coupling degree between the resonator coil and first noise cancellation resonator coil and second noise cancellation resonator including a second noise cancellation resonator coil and has a resonance frequency lower than the noise reduction target frequency by a second shift frequency according to coupling degree between the resonator coil and second noise cancellation resonator coil.

Claims

1. A power transmission system that transmits electric energy to a secondary resonator having a secondary resonator coil through an electromagnetic field of a predetermined frequency generated from a primary resonator having a primary resonator coil and that reduces noise using two noise cancellation resonators with one of the predetermined frequency and its higher harmonic component set as a noise reduction target frequency, the system characterized by comprising, as the two noise cancellation resonators:

a first noise cancellation resonator that includes a first noise cancellation resonator coil and has a resonance frequency higher than the noise reduction target frequency by a first shift frequency determined according to a coupling degree between the primary resonator coil and the first noise cancellation resonator coil; and

a second noise cancellation resonator that includes a second noise cancellation resonator coil and has a resonance frequency lower than the noise reduction target frequency by a second shift frequency determined according to a coupling degree between the primary resonator coil and the second noise cancellation resonator coil.

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

the primary resonator coil includes a main coil formed by winding a conductive wire about a first reference axis parallel to the ground, and

the first noise cancellation resonator coil is formed by winding a conductive wire, outside a space formed by an extended surface of a winding end face of the main coil, about a second reference axis parallel to the first reference axis.

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

the primary resonator coil includes a main coil formed by winding a conductive wire about a first reference axis parallel to the ground, and

the second noise cancellation resonator coil is formed by winding a conductive wire, inside a space formed by an extended surface of a winding end face of the main coil, about a third reference axis parallel to the first reference axis.

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

the first shift frequency is represented by the following expression:

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

the second shift frequency is represented by the following expression:

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

a Q-value of the noise cancellation resonator coil is 50 or more.