Non-Contact Power Transmission Apparatus

• US 20110140538A1
• Filed: 12/11/2009
• Published: 06/16/2011
• Est. Priority Date: 12/12/2008
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Hanrim Postech Co., Ltd.
• Inventors: Kuk, Yoon-Sang, Jung, Chun-Kil
• Granted Patent: US 8,552,593 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H01F 37/00 Fixed inductances not covered by group H01F17/00
• 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 2310/22 The load being a portable electronic device
• CPC Class Codes: H02J 3/322 the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
• 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 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 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/0044 specially adapted for holding portable devices containing batteries H02J7/0045 takes precedence
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A non-contact power transmission apparatus accurately determines the kind of object that is placed on the charging deck of the non-contact power transmission apparatus, and, only when a non-contact power receiving apparatus is placed on the power transmission apparatus, allows power transmission and data communication to take place, thereby accurately determining the state of the receiver side and efficiently controlling the transmission of power. In the power transmission apparatus, the power supplied to the non-contact power receiving apparatus is measured, and the output power of the wireless power signal output from two different cores is controlled, thereby allowing the charging operation to be stably conducted even if the non-contact power receiving apparatus is moved anywhere on the power transmission apparatus. The power transmission apparatus improves both the reliability of operation of the non-contact charging system, and the competitiveness of related products, such as portable terminals, battery packs and the like.

Claims

1. A non-contact power transmission apparatus comprising:

a primary core wirelessly sending out a wireless power signal to a non-contact power receiving apparatus having a secondary core, wherein the apparatus is operated such that, when the apparatus detects a change in a load of the primary core, the apparatus measures a delay time from an output time of an asking signal, asking what an object on the non-contact power transmission apparatus is, to a time of receipt of a response signal corresponding to the asking signal, the signals being transmitted via the primary core, compares the measured delay time with a reference standby time, and if the measured time is shorter than the reference standby time, determines that the object is a foreign substance, and if the measured time is longer than the reference standby time, determines that the object is a normal non-contact power receiving apparatus, and sends out the wireless power signal.

2. The non-contact power transmission apparatus according to claim 1, wherein the non-contact power receiving apparatus receives the wireless power signal from the non-contact power transmission apparatus, compares the received signal with a reference voltage, and creates a pulse signal based on a duty rate set depending upon a comparison result and transmits the created signal to the non-contact power transmission apparatus, which in turn controls intensity of the transmitted wireless power signal in correspondence with the transmitted pulse signal.

3. The non-contact power transmission apparatus according to claim 1 or 2, wherein the non-contact power receiving apparatus includes an ID transmitter for transmitting and receiving code data of an AC signal, modulated in an AC modulation manner, via the secondary core, and the non-contact power transmission apparatus includes a feedback circuit unit for extracting the code data of the AC signal from a DC signal applied to the primary core when the code data is received to the primary core.

4. The non-contact power transmission apparatus according to claim 3, wherein the non-contact power receiving apparatus includes a capacitor connected in parallel with a power receiving core side of the secondary core to remove a DC signal component.

5. The non-contact power transmission apparatus according to claim 4, wherein the non-contact power receiving apparatus further includes a MOSFET serially connected with the capacitor, and the ID transmitter inputs an operation voltage of the MOSFET to a gate terminal of the MOSFET in correspondence with the duty rate set depending on the comparison result.

6. The non-contact power transmission apparatus according to claim 3, wherein the feedback circuit unit includes an RC filter circuit electrically connected with an end of the primary core to remove the DC signal component, and an amplifying circuit having an OP-AMP electrically connected with the RC filter circuit.

7. The non-contact power transmission apparatus according to claim 3, wherein the primary core includes first and second power transmission core sides and has a multi-layered structure having an overlapping region in which the first and second power transmission core sides partially overlap each other.

8. A non-contact power transmission apparatus comprising a transmission module having a primary core wirelessly sending out a wireless power signal to a non-contact power receiving apparatus having a secondary core, wherein the transmission module includes:

a body case;

a board provided in the body case and having a control module for sending out the wireless power signal;

a shielding plate provided on an upper portion of the board;

first and second power transmission core sides provided on an upper portion of the shielding plate such that they are electrically connected with the control module, the first and second power transmission core sides partially overlapping each other;

a light-emitting device for displaying the charging state provided on a side of the body case such that it is electrically connected with the control module; and

a cover coupled to the body case and on which the non-contact power receiving apparatus is placed.

9. The non-contact power transmission apparatus according to claim 8, wherein at least one of the first and second power transmission core sides is formed into a bent form and the first and second power transmission core sides are of a multi-layered structure in which a region of the first core side overlapping the second core side is laid on or underneath a region of the second core side overlapping the first core side.

10. The non-contact power transmission apparatus according to claim 9, wherein the overlapping region is larger than a width of a wireless power receiving core of the wireless non-contact power receiving apparatus and smaller than widths of the first and second power transmission core sides.

11. The non-contact power transmission apparatus according to any one of claims 8 to 10, wherein the transmission module includes a fitting along which another transmission module detachably slides.

12. The non-contact power transmission apparatus according to any one of claims 8 to 10, wherein the body case is a support for a monitor.

13. The non-contact power transmission apparatus according to any one of claims 8 to 10, wherein the transmission module further includes a power cable connected to the power supply port provided in a monitor and through which the power for operating the monitor is supplied.

14. The non-contact power transmission apparatus according to claim 13, wherein the power cable is connected to a branching power cable supplying a regular power source to the monitor.

15. The non-contact power transmission apparatus according to any one of claims 8 to 10, wherein the transmission module includes, on another side of the body case, a connection terminal to be connected to a connection boat for an Optical Disk Drive (ODD) of a monitor, the connection terminal being electrically connected with the control module mounted on the board.