Non-contact electricity supply device

• US 9,682,631 B2
• Filed: 09/27/2013
• Issued: 06/20/2017
• Est. Priority Date: 03/21/2013
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Sakamoto, Akira, Yamaguchi, Nobuhisa
• Primary Examiner(s): Tran, Thienvu
• Assistant Examiner(s): Sun, Pinping
• Application Number:
  US14/039,071
• Publication Number:
  US 20140285027A1
• Time in Patent Office: 1,362 Days
• CPC Class Codes: B60L 2210/12 Buck converters
• CPC Class Codes: B60L 2210/14 Boost converters
• 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 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 53/30 Constructional details of charging stations
• CPC Class Codes: B60L 53/36 by positioning the vehicle
• CPC Class Codes: B60L 53/63 in response to network capacity
• CPC Class Codes: B60L 53/65 involving identification of vehicles or their battery types
• CPC Class Codes: B60L 55/00 Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• 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 10/126 : the energy generation units being or involving electric vehicles [EV] or hybrid vehicles [HEV], i.e. power aggregation of EV or HEV, vehicle to grid arrangements [V2G]
• CPC Class Codes: Y04S 30/14 : Details associated with the interoperability, e.g. vehicle recognition, authentication, identification or billing

Abstract

A power-supply-side coil receives an alternating current from an AC power source to produce a magnetic flux. A power-supply-side capacitor is connected in parallel with the power-supply-side coil. A power-supply-side filter circuit includes a reactor and a capacitor, which are connected in series between the AC power source and the power-supply-side coil. A power-receiving-side coil is interlinked with a magnetic flux produced by the power-supply-side coil to produce an alternating current. The power-supply-side filter circuit, the power-supply-side capacitor, and the power-supply-side form a circuit having an impedance having a frequency characteristic, in which a frequency of a minimum point formed on a high-frequency side relative to a maximum point is greater than a frequency of a fundamental wave of an alternating current supplied from the AC power source and is less than a frequency of a third order wave of the fundamental wave.

Claims

1. A non-contact electricity supply device comprising:

a power-supply-side coil configured to receive an alternating current, which is supplied from an AC power source to produce a magnetic flux;

a power-supply-side capacitor connected in parallel with the power-supply-side coil to form, with the power-supply-side coil, a resonant circuit;

a power-supply-side filter circuit connected between the AC power source and the power-supply-side coil, to which the power-supply-side capacitor is connected, the power-supply-side filter circuit including a reactor and a capacitor, which are connected in series; and

a power-receiving-side coil configured to be interlinked with a magnetic flux produced by the power-supply-side coil to produce an alternating current, wherein

the capacitance of the capacitor and the inductance of the reactor of the power-supply-side filter circuit, the capacitance of the power-supply-side capacitor, and the inductance of the power-supply-side coil are set, such that,

a circuit, which includes the power-supply-side filter circuit, the power-supply-side capacitor, and the power-supply-side coil, has an impedance having a frequency characteristic, in which a frequency of a minimum point of the impedance, which is formed on a high-frequency side relative to a maximum point of the impedance, is greater than a frequency of a fundamental wave of an alternating current supplied from the AC power source and is less than a frequency of a third order wave of the fundamental wave,

the capacitance of the capacitor and the inductance of the reactor of the power-supply-side filter circuit, the capacitance of the power-supply-side capacitor, and the inductance of the power-supply-side coil are set, such that,

the frequency of the minimum point of the impedance formed on the high-frequency side relative to the maximum point of the impedance is other than a frequency of a second order wave of the fundamental wave of an alternating current supplied from the AC power source,

the capacitance of the capacitor and the inductance of the reactor of the power-supply-side filter circuit, the capacitance of the power-supply-side capacitor, and the inductance of the power-supply-side coil are set, such that,

the frequency of the minimum point of the impedance formed on the high-frequency side relative to the maximum point of the impedance is greater than the frequency of the second order wave of the fundamental wave of an alternating current supplied from the AC power source and is less than the frequency of the third order wave of the fundamental wave, and

the capacitance of the capacitor and the inductance of the reactor of the power-supply-side filter circuit, the capacitance of the power-supply-side capacitor, and the inductance of the power-supply-side coil are set, such that,

the frequency of the minimum point of the impedance formed on the high-frequency side relative to the maximum point of the impedance is 2.5 times the frequency of the fundamental wave of an alternating current supplied from the AC power source.

2. The non-contact electricity supply device according to claim 1, wherein

the power-supply-side filter circuit includes two pairs each including a reactor having an equivalent inductance and a capacitor having an equivalent capacitance,

one of the two pairs includes the reactor and the capacitor, which are connected in series between one output end of the AC power source and one end of the power-supply-side coil, to which the power-supply-side capacitor is connected, and

an other of the two pairs includes the reactor and the capacitor, which are connected in series between an other output end of the AC power source and an other end of the power-supply-side coil, to which the power-supply-side capacitor is connected.

3. The non-contact electricity supply device according to claim 1, further comprising:

a rectification circuit configured to rectify an alternating current supplied from the power-receiving-side coil to convert the alternating current into a direct current.

4. The non-contact electricity supply device according to claim 3, further comprising:

a power-receiving-side converter circuit configured with a DC/DC converter circuit and connected to the rectification circuit, and

the power-receiving-side converter circuit is configured to receive the direct current from the rectification circuit and to convert the direct current into a direct current at a different voltage.

5. The non-contact electricity supply device according to claim 4, further comprising:

a battery connected to the power-receiving-side converter circuit.

6. The non-contact electricity supply device according to claim 1, wherein

the frequency of the fundamental wave is greater than a frequency at a center between the frequency of the minimum point of the impedance, which is formed on a low-frequency side relative to the maximum point of the impedance, and the frequency of the maximum point of the impedance.