WIRELESS POWER TRANSMITTING APPARATUS, WIRELESS POWER RECEIVING APPARATUS, AND WIRELESS POWER FEEDING SYSTEM

• US 20150130294A1
• Filed: 12/12/2014
• Published: 05/14/2015
• Est. Priority Date: 09/21/2011
• Status: Abandoned Application

• Current Assignee: Pioneer Corporation
• Original Assignee: Pioneer Corporation
• Inventors: SUZUKI, Masami, URUSHIBATA, Eiichi, IWAWAKI, Keisuke
• Application Number:
  US14/568,207
• Publication Number:
  US 20150130294A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2240/527 Voltage
• CPC Class Codes: B60L 2240/529 Current
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 2270/147 electro magnetic [EMI]
• CPC Class Codes: B60L 53/122 Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
• 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 53/37 using optical position determination, e.g. using cameras
• CPC Class Codes: B60L 53/65 involving identification of vehicles or their battery types
• CPC Class Codes: B60L 53/68 Off-site monitoring or control, e.g. remote control
• CPC Class Codes: H02J 50/12 of the resonant type
• 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 10/72 Electric energy management in electromobility
• 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
• CPC Class Codes: Y02T 90/167 : Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: Y04S 30/12 : Remote or cooperative charging
• CPC Class Codes: Y04S 30/14 : Details associated with the interoperability, e.g. vehicle recognition, authentication, identification or billing

Abstract

A wireless power transmitting apparatus (10) is a wireless power transmitting apparatus which transmits electric power in a wireless manner by electromagnetic induction to a power receiving apparatus (20) which is provided with a power reception coil (220) and a fixed capacitance capacitor (230) electrically connected in parallel with the power reception coil. The wireless power transmitting apparatus is provided with: an alternating current power supply (110) which generates alternating current power; a power transmission coil (120) which is electrically connected to the alternating current power supply; a variable capacitance capacitor (130) which is electrically connected in series with the power transmission coil; and a capacitance controlling device (140) which controls a capacitance value of the variable capacitance capacitor to reduce a phase difference between a voltage phase and a current phase of the alternating current power.

Claims

1. A wireless power transmitting apparatus which transmit electric power in a wireless manner to a power receiving apparatus, said wireless power transmitting apparatus comprising:

a power transmission coil;

a variable capacitance capacitor which is electrically connected with the power transmission coil;

a positional deviation amount detecting device configured to detect a positional deviation amount of a center of a power reception coil of the power receiving apparatus to a center of the power transmission coil; and

a capacitance controlling device configured to control capacitance of the variable capacitance capacitor on the basis of the detected positional deviation amount.

2. The wireless power transmitting apparatus according to claim 1, wherein

said wireless power transmitting apparatus further comprises a distance sensor configured to measure a distance between the power reception coil and the power transmission coil, and

the capacitance controlling device controls the capacitance of the variable capacitance capacitor on the basis of the measured distance and the detected positional deviation amount.

3. The wireless power transmitting apparatus according to claim 2, wherein

said wireless power transmitting apparatus further comprises a coupling coefficient conversing device configured to convert the measured distance and the detected positional deviation amount into a coupling coefficient indicating extent of magnetic coupling of the power transmission coil and the power reception coil, and

the capacitance controlling device controls the capacitance of the variable capacitance capacitor on the basis of the converted coupling coefficient.

4. The wireless power transmitting apparatus according to claim 3, wherein the coupling coefficient conversing device stores therein in advance a correspondence of the distance and the positional deviation amount with the coupling coefficient, and converts the measured distance and the detected positional deviation amount into the coupling coefficient on the basis of the stored correspondence.

5. A control method in a wireless power transmitting apparatus which has a power transmission coil, a variable capacitance capacitor electrically connected with the power transmission coil, and which transmits electric power in a wireless manner to a power receiving apparatus, said control method comprising:

a positional deviation amount detecting process which detects a positional deviation amount of a center of a power reception coil of the power receiving apparatus to a center of the power transmission coil; and

a capacitance controlling process which controls capacitance of the variable capacitance capacitor on the basis of the detected positional deviation amount.

6. The control method according to claim 5, wherein

said control method further comprises a distance measuring process which measures a distance between the power reception coil and the power transmission coil, and

the capacitance controlling process controls the capacitance of the variable capacitance capacitor on the basis of the measured distance and the detected positional deviation amount.

7. The control method according to claim 6, wherein

said control method further comprises a coupling coefficient conversing process which converts the measured distance and the detected positional deviation amount into a coupling coefficient indicating extent of magnetic coupling of the power transmission coil and the power reception coil, and

the capacitance controlling process controls the capacitance of the variable capacitance capacitor on the basis of the converted coupling coefficient.

8. The control method according to claim 7, wherein

the wireless power transmitting apparatus stores therein in advance a correspondence of the distance and the positional deviation amount with the coupling coefficient, and

the coupling coefficient conversing process converts the measured distance and the detected positional deviation amount into the coupling coefficient on the basis of the stored correspondence.