Noncontact charging device

• US 20080164839A1
• Filed: 01/07/2008
• Published: 07/10/2008
• Est. Priority Date: 01/09/2007
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group), Sony Ericsson Mobile Communications Japan Incorporated (Sony Group Corp.)
• Original Assignee: Seiko Epson Corporation (Seiko Group), Sony Ericsson Mobile Communications Japan Incorporated (Sony Group Corp.)
• Inventors: Kamijo, Takahiro, Sogabe, Haruhiko, Suzuki, Katsuya, Yamazaki, Manabu, Onishi, Kota, Jin, Mikimoto, Kato, Hiroshi, Kondo, Yoichiro, Suzuki, Kuniharu, Yoda, Kentaro
• Granted Patent: US 8,089,245 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H01F 2027/406 Temperature sensor or protection
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• 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 7/00045 Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source
• CPC Class Codes: H02J 7/007192 in response to temperature
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage

Abstract

A noncontact charging device includes a mounting portion, a primary transmission coil, a temperature-detecting element, and a control unit. A device charged in a noncontact manner is mounted on the mounting portion. The primary transmission coil supplies power to a secondary transmission coil provided to the device by the use of electromagnetic induction. The temperature-detecting element detects a temperature of a material mounted on the mounting portion. The control unit is configured to supply power to the primary transmission coil and terminate the power supply to the primary transmission coil when a predetermined temperature is detected by the temperature-detecting element. The temperature-detecting element is located on a side of a contact surface between the mounting portion and the primary transmission coil, and the center of the temperature-detecting element is located within a range of the diameter of the primary transmission coil from the center position of the primary transmission coil.

Claims

1. A noncontact charging device, comprising:

a mounting portion on which a device charged in a noncontact manner is mounted;

a primary transmission coil for supplying power to a secondary transmission coil provided to the device by the use of electromagnetic induction;

a temperature-detecting element for detecting a temperature of a material mounted on the mounting portion; and

control means for carrying out control of supplying power to the primary transmission coil and terminating the power supply to the primary transmission coil when a predetermined temperature is detected by the temperature-detecting element, wherein

the temperature-detecting element is located on a side of a contact surface between the mounting portion and the primary transmission coil, and the center of the temperature-detecting element is located within a range of the diameter of the primary transmission coil from the center position of the primary transmission coil.

2. A noncontact charging device according to claim 1, wherein

the temperature-detecting element is located on the side of a contact surface between the mounting portion and the primary transmission coil, and the center of the temperature-detecting element is located between a position at a distance corresponding to the inner radius of the primary transmission coil from the center of the primary transmission coil and a position at a distance corresponding to the inner diameter of the primary transmission coil.

3. A noncontact charging device according to claim 2, wherein

the control means carries out control of acquiring a temperature detection output from the temperature-detecting element at predetermined intervals, detecting an amount of increase in temperature at the intervals, and terminating the power supply to the primary transmission coil when the amount of increase in temperature is equal to or more than a predetermined amount of increase in temperature.

4. A noncontact charging device according to claim 1,

wherein the primary transmission coil includes a plurality of conductor patterns stacked on a flexible printed-circuit board;

and

wherein the temperature-detecting element is directly formed as a temperature-detecting element layer in the conductor pattern of the flexible printed-circuit board.

5. A noncontact charging device, comprising:

a mounting portion on which a device charged in a noncontact manner is mounted;

a primary transmission coil for supplying power to a secondary transmission coil provided to the device by the use of electromagnetic induction;

a temperature-detecting element for detecting a temperature of a material mounted on the mounting portion; and

a control unit configured to supply power to the primary transmission coil and terminate the power supply to the primary transmission coil when a predetermined temperature is detected by the temperature-detecting element, wherein

the temperature-detecting element is located on a side of a contact surface between the mounting portion and the primary transmission coil, and the center of the temperature-detecting element is located within a range of the diameter of the primary transmission coil from the center position of the primary transmission coil.