Detection device, power reception device, power transmission device and non-contact power supply system

Patent metadata

Field	Value
Publication number	US-9518948-B2
Application number	US-201313867235-A
Country	US
Kind code	B2
Filing date	Apr 22, 2013
Priority date	May 7, 2012
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

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.

First claim

What is claimed is:

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 value of a magnetic coupling element, of the one or the plurality of magnetic coupling elements, or 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.

2. The detection device according to claim 1 ,
wherein the circuit including at least the magnetic coupling element 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 the 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 the 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 two or more measurement results or calculation results among the 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 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 a 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 1 ,
wherein the magnetic coupling element is at least any one of a power reception coil used for a non-contact power supply from a 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 a magnetic coupling element, of the one or the plurality of magnetic coupling elements, or 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 a magnetic coupling element, of the one or the plurality of magnetic coupling elements, or 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 a magnetic coupling element, of the one or the plurality of magnetic coupling elements, or 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.

Assignees

• Sony Corp

Inventors

• Miyamoto Takashi
• Nakano Hiroaki
• MURAKAMI Tomomichi

Classifications

• H02J50/60

  responsive to the presence of foreign objects, e.g. detection of living beings · CPC title

• H02J50/12 Primary

  of the resonant type · CPC title

• H02J50/20

  using microwaves or radio frequency waves · CPC title

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02J7/42

  with electronic devices having internal batteries, e.g. mobile phones · CPC title