Power feeding device and power receiving device for contactless power transmission

• US 9,887,559 B2
• Filed: 11/11/2015
• Issued: 02/06/2018
• Est. Priority Date: 05/14/2013
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Ibaragi, Hiroshi
• Primary Examiner(s): Cox, Cassandra
• Application Number:
  US14/937,966
• Publication Number:
  US 20160064954A1
• Time in Patent Office: 818 Days
• Field of Search: None
• CPC Class Codes: G01K 1/026 arrangements for monitoring a plurality of temperatures, e.g. by multiplexing
• CPC Class Codes: G01K 13/00 Thermometers specially adapted for specific purposes
• CPC Class Codes: G01K 7/22 the element being a non-linear resistance, e.g. thermistor G01K7/26 takes precedence
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 7/35 with light sensitive cells

Abstract

A power feeding device includes a cover, a primary coil covered with the cover and provided in a predetermined direction with respect to the cover, and a temperature-sensitive detector that detects the temperature of an object on the cover. When the distance from the surface of the cover to the temperature-sensitive detector in the predetermined direction is denoted by L [m], the temperature of the object to be subjected to thermometry by the temperature-sensitive detector is denoted by T₀ [K], the temperature to be detected by the temperature-sensitive detector is denoted by T₁ [K], and the thermal conductivity of the cover is denoted by λ [W/(m·K)], L satisfies the following equation

$\begin{array}{cc}L\le \frac{\lambda \times \left(T_0-T_1\right)}{5\times T_1}.& \left(1\right)\end{array}$
This allows the temperature of the object on the cover to be accurately detected.

Claims

1. A power feeding device for supplying power in a contactless manner to a power receiving device, the power feeding device comprising:

a cover;

a coil covered with the cover and provided in a predetermined direction with respect to the cover; and

a temperature-sensitive detector that detects a temperature of an object on the cover;

wherein

a distance from a surface of the cover to the temperature-sensitive detector in the predetermined direction is denoted by L [m], a temperature of an object to be subjected to thermometry by the temperature-sensitive detector is denoted by T₀ [K], a temperature to be detected by the temperature-sensitive detector is denoted by T₁ [K], and a thermal conductivity of the cover is denoted by λ

[W/(m·

K)], and L satisfies;

2. The power feeding device according to claim 1, wherein the temperature-sensitive detector includes a plurality of thermistors arranged in a row.

3. The power feeding device according to claim 1, wherein the temperature-sensitive detector includes thermistors of type 1005.

4. The power feeding device according to claim 1, further comprising an adapter, a transmission system part group, a primary coil, and a primary controller.

5. The power feeding device according to claim 4, wherein the transmission system part group includes at least one of a rectifier circuit, a smoothing circuit, and an inverter circuit.

6. The power feeding device according to claim 1, wherein the temperature-sensitive detector is a negative temperature coefficient thermistor.

7. The power feeding device according to claim 1, wherein the temperature-sensitive detector includes a plurality of thermistors embedded in the cover.

8. The power feeding device according to claim 1, wherein the temperature-sensitive detector is one of a positive temperature coefficient thermistor and a polymer thermistor.

9. The power feeding device according to claim 1, wherein the temperature-sensitive detector includes thermistors of type 3225, type 3216, type 2012, type 1608, type 0603, or type 0402.

10. A contactless power transmission system comprising the power feeding device according to claim 1.

11. A power receiving device for receiving power transmitted in a contactless manner from a power feeding device, the power receiving device comprising:

a cover;

a coil covered with the cover and provided in a predetermined direction with respect to the cover; and

a temperature-sensitive detector that detects a temperature of an object on the cover;

wherein

a distance from a surface of the cover to the temperature-sensitive detector in the predetermined direction is denoted by L [m], a temperature of an object to be subjected to thermometry by the temperature-sensitive detector is denoted by T₀ [K], a temperature to be detected by the temperature-sensitive detector is denoted by T₁ [K], and a thermal conductivity of the cover is denoted by λ

[W/(m·

K)], and L satisfies;

12. The power receiving device according to claim 11, further comprising a secondary coil, a transmission system part group and a secondary controller.

13. The power receiving device according to claim 12, wherein the transmission system part group includes at least one rectifier circuit.

14. The power receiving device according to claim 11, wherein the temperature-sensitive detector includes a plurality of thermistors arranged in a row.

15. The power receiving device according to claim 11, wherein the temperature-sensitive detector includes thermistors of type 1005.

16. The power receiving device according to claim 11, wherein the temperature-sensitive detector is a negative temperature coefficient thermistor.

17. The power receiving device according to claim 11, wherein the temperature-sensitive detector includes a plurality of thermistors embedded in the cover.

18. The power receiving device according to claim 11, wherein the temperature-sensitive detector is one of a positive temperature coefficient thermistor and a polymer thermistor.

19. The power receiving device according to claim 11, wherein the temperature-sensitive detector includes thermistors of type 3225, type 3216, type 2012, type 1608, type 0603, or type 0402.

20. A contactless power transmission system comprising the power receiving device according to claim 11.