POWER SUPPLY DEVICE, POWER RECEIVING DEVICE, AND CHARGING SYSTEM

• US 20160052405A1
• Filed: 03/24/2014
• Published: 02/25/2016
• Est. Priority Date: 03/27/2013
• Status: Active Grant

• Current Assignee: Panasonic Automotive Systems Company of America (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: KOIZUMI, Masayoshi, OHASHI, Osamu, NISHIO, Tsuyoshi, ASAOKA, Noriaki
• Granted Patent: US 9,815,380 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60L 2270/147 electro magnetic [EMI]
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• 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 53/124 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: B60L 53/37 using optical position determination, e.g. using cameras
• CPC Class Codes: H01M 10/42 Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells H01M10/60 takes precedence
• CPC Class Codes: H01M 2250/20 Fuel cells in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H02J 5/00 Circuit arrangements for transfer of electric power between ac networks and dc networks H02J3/36 takes precedence
• CPC Class Codes: H02J 50/05 using capacitive coupling
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• 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: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/50 Fuel cells
• 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 90/40 Application of hydrogen technology to transportation, e.g. using fuel cells

Abstract

Power supply device is provided with the following: a power supply unit (121) that includes a spiral coil or a solenoid coil; a frequency characteristic acquisition unit (211) that acquires the frequency characteristics of the efficiency of the supply of power from the power supply unit to the power receiving device; a peak determining unit (212) that determines peaks in the frequency characteristics of the efficiency of power supply; and a drive frequency determination unit (213) that, if two peaks have been found, determines as the drive frequency used for supplying power a frequency near the frequency that is the lower of the frequencies of the two peaks, with the lower frequency being given priority over a frequency near the higher frequency.

Claims

1. A power supply apparatus that is to be disposed on a ground side and that supplies power using an electromagnetic force to a power receiving apparatus disposed on a vehicle, the power supply apparatus comprising:

a power supply section including a spiral coil or a solenoid coil;

a frequency characteristic acquiring section that acquires a frequency characteristic for efficiency of power supply performed from the power supply section to the power receiving apparatus;

a peak determining section that determines a peak in the frequency characteristic for the efficiency of power supply; and

a drive frequency determining section that determines, when two peaks are determined, a frequency in the vicinity of a lower frequency of frequencies at the two peaks to be a drive frequency preferentially over a frequency in the vicinity of a higher frequency, the drive frequency being used for the power supply.

2. The power supply apparatus according to claim 1, further comprising an acquiring section that acquires power received by the power receiving apparatus from the power receiving apparatus, wherein

the frequency characteristic acquiring section acquires the frequency characteristic for the efficiency of power supply from supplied power during the power supply and the received power.

3. The power supply apparatus according to claim 1, wherein

the power supply section performs the power supply using a constant voltage, and

the frequency characteristic acquiring section acquires a frequency characteristic of a current value of the power supply section as the frequency characteristic for the efficiency of power supply.

4. The power supply apparatus according to claim 1, wherein

the power supply section performs the power supply using a constant current, and

the frequency characteristic acquiring section acquires a frequency characteristic of a voltage value of the power supply section as the frequency characteristic for the efficiency of power supply.

5. The power supply apparatus according to claim 1, wherein the power supply section performs test power supply that supplies power to the power receiving apparatus while sequentially changing a frequency in order for the frequency characteristic acquiring section to acquire the frequency characteristic for the efficiency of power supply.

6. The power supply apparatus according to claim 5, wherein the power supply section performs the test power supply in a range equal to or lower than a predetermined frequency representing a local minimum value between the two peaks.

7. The power supply apparatus according to claim 1, wherein the spiral coil is disposed so that a central axis of winding of the spiral coil is perpendicular to the surface of the ground.

8. The power supply apparatus according to claim 1, wherein the solenoid coil is disposed so that a central axis of winding of the solenoid coil is parallel to the surface of the ground.

9. The power supply apparatus according to claim 1, wherein the drive frequency determining section determines a frequency shifted by a predetermined value from the lower frequency of the frequencies at the two peaks to be the drive frequency.

10. The power supply apparatus according to claim 1, wherein the drive frequency determining section determines a frequency at which a current flowing through the power receiving coil becomes in-phase with a current flowing through the power supply coil to be the drive frequency, preferentially over a frequency at which the phase is reversed.

11. A power receiving apparatus that is to be disposed on a vehicle and that receives power supplied using an electromagnetic force from the power supply apparatus according to claim 1 to be disposed on a ground side, the power receiving apparatus comprising a power receiving section including a spiral coil or solenoid coil that receives the power supplied from the power supply apparatus.

12. The power receiving apparatus according to claim 11, wherein the spiral coil is disposed so that a central axis of winding of the spiral coil is perpendicular to the surface of the ground.

13. The power receiving apparatus according to claim 11, wherein the solenoid coil is disposed so that a central axis of winding of the solenoid coil is parallel to the surface of the ground.

14. A charging system comprising:

a power supply apparatus to be disposed on a ground side; and

a power receiving apparatus that is to be disposed on a vehicle and that receives power supplied from the power supply apparatus using an electromagnetic force, wherein

the power receiving apparatus includes;

a power receiving section including a spiral coil or solenoid coil that receives the power supplied from the power supply apparatus; and

a storage battery that stores the power received by the power receiving section, and

the power supply apparatus includes;

a power supply section that includes a spiral coil or solenoid coil;

a frequency characteristic acquiring section that acquires a frequency characteristic for efficiency of power supply performed from the power supply section to the power receiving section;

a peak determining section that determines a peak in the frequency characteristic for the efficiency of power supply; and

a drive frequency determining section that determines, when two peaks are determined, a frequency in the vicinity of a lower frequency of frequencies at the two peaks to be a drive frequency preferentially over a frequency in the vicinity of a higher frequency, the drive frequency being used for the power supply.