Method for controlling contactless power supplying device and contactless power supplying device

• US 9,275,789 B2
• Filed: 10/17/2012
• Issued: 03/01/2016
• Est. Priority Date: 08/01/2011
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Irie, Kenichi, Kawada, Masashi
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): Evans, James P
• Application Number:
  US13/653,499
• Publication Number:
  US 20140103732A1
• Time in Patent Office: 1,231 Days
• Field of Search: 307/104, 713/340, 713/300
• US Class Current: 1/1
• CPC Class Codes: G01V 3/10 using induction coils
• 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 50/10 using inductive coupling
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/0044 specially adapted for holding portable devices containing batteries H02J7/0045 takes precedence

Abstract

A method for controlling a contactless power supplying device that excites a primary coil and supplies power using an electromagnetic induction effect to a secondary coil of a power receiving device arranged in an electric appliance is provided. A full-bridge circuit is full-bridge-operated to excite the primary coil when the electric appliance is on a setting surface. The full-bridge circuit is half-bridge-operated to excite the primary coil when the electric appliance is not on the setting surface.

Claims

1. A method for controlling a contactless power supplying device, wherein the contactless power supplying device includes a setting surface on which an electric appliance is set, a plurality of power supplying areas that are adjacently defined in the setting surface, and a plurality of primary coils that are respectively arranged in the plurality of power supplying areas, and wherein the contactless power supplying device is configured to excite at least one of the primary coils and supply power using an electromagnetic induction effect to a secondary coil of a power receiving device arranged in the electric appliance, the method comprising:

determining whether or not a metal piece is present in at least one of the power supplying areas;

full-bridge-operating a full-bridge circuit to excite at least one of the primary coils when the electric appliance is on the setting surface; and

half-bridge-operating the full-bridge circuit to excite at least one of the primary coils when the metal piece is present in at least one of the power supplying areas or when the electric appliance is not on the setting surface,

wherein the half-bridge-operate includes continuing to half-bridge-operating the full-bridge circuit until the electric appliance is set on the setting surface.

2. The method for controlling a contactless power supplying device according to claim 1, wherein

the full-bridge-operation of the full-bridge circuit continuously excites at least one of the primary coils when the electric appliance is on the setting surface, and

the half-bridge operation of the full-bridge circuit intermittently excites at least one of the primary coils when the metal piece is present in at least one of the power supplying areas or when the electric appliance is not on the setting surface.

3. The method for controlling a contactless power supplying device according to claim 2, further comprising:

during the half-bridge-operating, performing a presence detection processing operation to determine whether or not any object is present in at least one of the power supplying areas.

4. The method for controlling a contactless power supplying device according to claim 3, further comprising:

during the half-bridge-operating, performing a metal foreign object detection processing operation after the presence detection processing operation to determine whether or not a metal piece is present in at least one of the power supplying areas based on exciting a metal detection coil of the contactless power supplying device.

5. The method for controlling a contactless power supplying device according to claim 4, further comprising:

during the half-bridge-operating, performing a machine type detection processing operation after the metal foreign object detection processing operation to determine whether or not the electric appliance, which is of a machine type that can be supplied with power by the contactless power supplying device, is set in at least one of the power supplying areas; and

continuously exciting at least one of the primary coils when it is determined that the electric appliance, which is of the machine type that can be supplied with power by the contactless power supplying device, is set.

6. The method for controlling a contactless power supplying device according to claim 4, wherein:

the full-bridge circuit includes high-side MOS transistors and low-side MOS transistors; and

the performing a metal foreign object detection processing operation includes controlling the full-bridge circuit, which is connected to one of the primary coils adjacent to the metal detection coil, to turn OFF the high-side MOS transistors and turn ON the low-side MOS transistors.

7. The method for controlling a contactless power supplying device according to claim 4, wherein:

the performing a metal foreign object detection processing operation includes turning OFF all of the MOS transistors of the full-bridge circuit, which is connected to one of the primary coils adjacent to the metal detection coil.

8. A contactless power supplying device comprising:

a setting surface on which an electric appliance is set;

a plurality of power supplying areas that are adjacently defined in the setting surface;

a plurality of primary coils that are respectively arranged in the plurality of power supplying areas, wherein the contactless power supplying device is configured to excite at least one of the primary coils and supply power using an electromagnetic induction effect to a secondary coil of a power receiving device arranged in the electric appliance;

a plurality of full-bridge circuits, wherein each of the full-bridge circuits is arranged in a corresponding one of the power supplying areas and excites and drives a corresponding one of the primary coils;

a detection circuit that detects whether or not an object is present on the setting surface and generates a detection signal; and

a system control unit that drives and controls the full-bridge circuits, wherein the system control unit full-bridge-operates at least one of the full-bridge circuits to excite at least one of the primary coils when the detection signal indicates that the electric appliance is on the setting surface, and the system control unit half-bridge-operates at least one of the full-bridge circuits to excite at least one of the primary coils when the detection signal indicates that a metal piece is present in at least one of the power supplying areas or when the detection signal indicates that the electric appliance is not on the setting surface,

wherein the half-bridge-operate includes continuing to half-bridge-operating the full-bridge circuit until the electric appliance is set on the setting surface.

9. The contactless power supplying device according to claim 8, wherein the system control unit continuously excites at least one of the primary coils by full-bridge-operating at least one of the full-bridge circuits when the detection signal indicates that the electric appliance is on the setting surface, and the system control unit intermittently excites at least one of the primary coils by half-bridge-operating at least one of the full-bridge circuits when the detection signal indicates that a metal piece is present in at least one of the power supplying areas or when the detection signal indicates that the electric appliance is not on the setting surface.

10. The contactless power supplying device according to claim 9, wherein:

the system control unit is configured to, during the half-bridge-operating, perform a presence detection processing operation to determine whether or not any object is present in at least one of the power supplying areas.

11. The contactless power supplying device according to claim 10, further comprising:

a metal detection coil, wherein the system control unit is configured to, during the half-bridge-operating, perform a metal foreign object detection processing operation after the presence detection processing operation to determine whether or not a metal piece is present in at least one of the power supplying areas based on exciting the metal detection coil.

12. The contactless power supplying device according to claim 11, wherein:

the system control unit is configured to

during the half-bridge-operating, perform a machine type detection processing operation after the metal foreign object detection processing operation to determine whether or not an electric appliance, which is of a machine type that can be supplied with power by the contactless power supplying device, is set in at least one of the power supplying areas, and

continuously excite at least one of the primary coils when it is determined that the electric appliance, which is of the machine type that can be supplied with power by the contactless power supplying device, is set.

13. The contactless power supplying device according to claim 11, wherein:

each of the full-bridge circuits includes high-side MOS transistors and low-side MOS transistors; and

the system control unit is configured to, during the metal foreign object detection processing operation, control the full-bridge circuit, which is connected to one of the primary coils adjacent to the metal detection coil, to turn OFF the high-side MOS transistors and turn ON the low-side MOS transistors.

14. The contactless power supplying device according to claim 11, wherein:

the system control unit is configured to, during the metal foreign object detection processing operation, turn OFF all MOS transistors of the full-bridge circuit, which is connected to one of the primary coils adjacent to the metal detection coil.