Power transmission control device, power transmitting device, non-contact power transmission system, electronic instrument, and power transmission control method

• US 8,803,364 B2
• Filed: 01/08/2009
• Issued: 08/12/2014
• Est. Priority Date: 01/09/2008
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Onishi, Kota, Kamiyama, Masayuki, Shiozaki, Nobutaka, Kamijo, Takahiro, Hasegawa, Minoru, Sogabe, Haruhiko
• Primary Examiner(s): Fleming, Fritz M
• Application Number:
  US12/350,495
• Publication Number:
  US 20090174264A1
• Time in Patent Office: 2,042 Days
• Field of Search: 307/104
• US Class Current: 307/104
• 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 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 7/00045 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 7/0047 with monitoring or indicating devices or circuits
• CPC Class Codes: H02J 7/0049 Detection of fully charged condition

Abstract

A power transmission control device provided in a power transmitting device of a non-contact power transmission system includes a power-transmitting-side control circuit that controls power transmission to a power receiving device, the power-transmitting-side control circuit causing the power transmitting device to perform intermittent temporary power transmission, detecting a response from the power receiving device that has received the power due to the temporary power transmission to automatically detect installation of a power-receiving-side instrument that includes the power receiving device in an area in which power transmitted via non-contact power transmission can be received, and causing the power transmitting device to perform continuous normal power transmission to the power receiving device when the installation of the power-receiving-side instrument has been detected. A foreign object detection process may also be performed in combination.

Claims

1. A power transmission control device provided in a power transmitting device of a non-contact power transmission system, the non-contact power transmission system performing non-contact power transmission from the power transmitting device to a power receiving device via a primary coil and a secondary coil that are electromagnetically coupled, the power transmission control device comprising:

a power-transmitting-side control circuit that controls power transmission to the power receiving device,

the power-transmitting-side control circuit causing the power transmitting device to perform intermittent temporary power transmission,

the power receiving device that has received the temporary power transmission performing position detection that checks whether or not a power-receiving-side instrument that includes the power receiving device is placed at an appropriate position,

the power receiving device transmitting an ID authentication frame to the power transmitting device when the power-receiving-side instrument is placed at the appropriate position,

the power-transmitting-side control circuit performing an ID authentication process based on the ID authentication frame and transmitting a permission frame to the power receiving device when the ID authentication frame has been detected within a given period of time after the intermittent temporary power transmission and the ID authentication has succeeded,

the power-transmitting-side control circuit causing the power transmitting device to continuously perform the intermittent temporary power transmission when the ID authentication frame has not been detected within the given period of time after the intermittent temporary power transmission,

the power receiving device checking the permission frame and transmitting a start frame to the power transmitting device to start continuous normal power transmission,

the power-transmitting-side control circuit causing the power transmitting device to perform the continuous normal power transmission to the power receiving device when the start frame has been detected.

2. A power transmitting device comprising:

the power transmission control device as defined in claim 1; and

a power transmitting section that generates an alternating-current voltage and supplies the alternating-current voltage to the primary coil.

3. An electronic instrument comprising the power transmitting device as defined in claim 2.

4. A non-contact power transmission system comprising a power transmitting device and a power receiving device, the non-contact power transmission system performing non-contact power transmission from the power transmitting device to the power receiving device via a primary coil and a secondary coil that are electromagnetically coupled,

the power transmitting device including a power-transmitting-side control circuit that controls power transmission to the power receiving device based on an induced voltage in the primary coil;

the power receiving device including a power supply control section that controls power supply to a load, and a power reception control device that includes a power-receiving-side control circuit that controls the power receiving device; and

the power-transmitting-side control circuit of the power transmitting device causing the power transmitting device to perform intermittent temporary power transmission,

the power receiving device that has received the power due to the temporary power transmission performing position detection that checks whether or not a power-receiving-side instrument that includes the power receiving device is placed at an appropriate position,

the power receiving device transmitting an ID authentication frame to the power transmitting device when the power-receiving-side instrument is placed at the appropriate position,

the power-transmitting-side control circuit performing an ID authentication process based on the ID authentication frame and transmitting a permission frame to the power receiving device when the ID authentication frame has been detected within a given period of time after the intermittent temporary power transmission and the ID authentication has succeed,

the power-transmitting-side control circuit causing the power transmitting device to continuously perform the intermittent temporary power transmission when the ID authentication frame has not been detected within the given period of time after the intermittent temporary power transmission,

the power receiving device checking the permission frame and transmitting a start frame to the power transmitting device to start continuous normal power transmission,

the power-transmitting-side control circuit causing the power transmitting device to perform the continuous normal power transmission to the power receiving device when the start frame has been detected.

5. A power transmission control method that controls power transmission from a power transmitting device to a power receiving device, the method comprising:

causing the power transmitting device to perform intermittent temporary power transmission;

causing the power receiving device that has received the intermittent temporary power transmission to perform position detection that checks whether or not a power-receiving-side instrument that includes the power receiving device is placed at an appropriate position,

causing the power receiving device to transmit an ID authentication frame to the power transmitting device when the power-receiving-side instrument is placed at the appropriate position;

causing the power transmitting device to perform an ID authentication process based on the ID authentication frame and to transmit a permission frame to the power receiving device when the ID authentication frame has been detected within a given period of time after the intermittent temporary power transmission and the ID authentication has succeeded;

causing the power transmitting device to continuously perform the intermittent temporary power transmission when the ID authentication frame has not been detected within the given period of time after the intermittent temporary power transmission;

causing the power receiving device to check the permission frame and to transmit a start frame to the power transmitting device to start continuous normal power transmission; and

causing the power transmitting device to perform the continuous normal power transmission to the power receiving device when the start frame has been detected.