DETECTION DEVICE, POWER RECEPTION DEVICE, POWER TRANSMISSION DEVICE AND NON-CONTACT POWER SUPPLY SYSTEM

• US 20130293026A1
• Filed: 04/22/2013
• Published: 11/07/2013
• Est. Priority Date: 05/07/2012
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Miyamoto, Takashi, Nakano, Hiroaki, Murakami, Tomomichi
• Granted Patent: US 9,518,948 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: B60L 2270/147 electro magnetic [EMI]
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: B60L 53/124 Detection or removal of foreign bodies
• CPC Class Codes: B60L 53/30 Constructional details of charging stations
• CPC Class Codes: B60L 53/36 by positioning the vehicle
• CPC Class Codes: G01N 27/045 Circuits measuring resistance per se G01R27/00, e.g. G01R27/22
• CPC Class Codes: G01R 33/123 Measuring loss due to hysteresis G01R33/14 takes precedence
• CPC Class Codes: G01V 3/08 operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices with electromagnetic waves G01V3/12
• CPC Class Codes: G01V 3/10 using induction coils
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• 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 detection device, including: one or a plurality of magnetic coupling elements configured to have one or a plurality of coils; and a detection unit that measures or calculates an effective resistance values of the magnetic coupling elements or an effective resistance value of a circuit including at least the magnetic coupling elements and determines a presence or absence of a foreign substance based on a change in the effective resistance value.

Claims

1. A detection device, comprising:

one or a plurality of magnetic coupling elements configured to have one or a plurality of coils; and

a detection unit that measures or calculates an effective resistance values of the magnetic coupling elements or an effective resistance value of a circuit including at least the magnetic coupling elements and determines a presence or absence of a foreign substance based on a change in the effective resistance value.

2. The detection device according to claim 1,

wherein the circuit including at least the magnetic coupling elements is a resonance circuit.

3. The detection device according to claim 2,

wherein the effective resistance value is at least an effective resistance value in the vicinity of a resonance frequency of the resonance circuit.

4. The detection device according to claim 3,

wherein the effective resistance value is measured or calculated using at least a measurement result or a calculation result on at least any one of a Q value of the resonance circuit and the resonance frequency of the resonance circuit.

5. The detection device according to claim 4,

wherein in a state where the foreign substance is not around the one or the plurality of magnetic coupling elements, the effective resistance value of the magnetic coupling element or the effective resistance value of the resonance circuit including at least the magnetic coupling element is set to a threshold value used for determining presence or absence of a foreign substance.

6. The detection device according to claim 4,

wherein at least any one of the Q value and the resonance frequency is measured or calculated using at least the measurement result or calculation result on a voltage amplitude of a high frequency power flowing in the magnetic coupling element or the resonance circuit.

7. The detection device according to claim 6,

wherein the effective resistance value is measured or calculated using at least the measurement result or the calculation result on the Q value of the resonance circuit and the resonance frequency of the resonance circuit.

8. The detection device according to claim 1,

wherein the effective resistance value is measured or calculated using at least a measurement result or a calculation result on a voltage amplitude of a high frequency power flowing in the magnetic coupling element or power flowing in the circuit including at least the magnetic coupling element.

9. The detection device according to claim 8,

wherein the effective resistance value is measured or calculated using at least at least two or more measurement results or calculation results among a voltage amplitude, a voltage phase, a current amplitude and a current phase of the high frequency power flowing in the magnetic coupling element or the high frequency power flowing in the circuit including at least the magnetic coupling element.

10. The detection device according to claim 1,

wherein the magnetic coupling element is at least any one of a power reception coil used for a non-contact power supply from the power supply source, a power transmission coil used for the non-contact power supply from the power supply source, and a coil which is different from the power reception coil and the power transmission coil.

11. The detection device according to claim 10,

wherein the magnetic coupling element is at least any one of the power reception coil used for a non-contact power supply from the power supply source and a power transmission coil used for the non-contact power supply from the power supply source.

12. A power reception device, comprising:

a power reception coil used for a non-contact power supply from the power supply source;

one or a plurality of magnetic coupling elements configured to have one or a plurality of coils; and

a detection unit that measures or calculates an effective resistance value of the magnetic coupling element or an effective resistance value of a circuit including at least the magnetic coupling element and determines a presence or absence of a foreign substance based on a change in the effective resistance value.

13. A power transmission device, comprising:

a power transmission coil used for a non-contact power supply to the power supply destination;

one or a plurality of magnetic coupling elements configured to have one or a plurality of coils; and

a detection unit that measures or calculates an effective resistance value of the magnetic coupling element or an effective resistance value of a circuit including at least the magnetic coupling element and determines a presence or absence of a foreign substance based on a change in the effective resistance value.

14. A non-contact power supply system configured to include a power transmission device used for a non-contact power supply to the power supply destination and a power reception device receiving a power in a non-contact manner from the power transmission device,

wherein at least any one of the power transmission device and the power reception device configured includes:

one or a plurality of magnetic coupling elements configured to have one or a plurality of coils; and

a detection unit that measures or calculates an effective resistance value of the magnetic coupling element or an effective resistance value of a circuit including at least the magnetic coupling element and determines a presence or absence of a foreign substance based on a change in the effective resistance value.