ELECTRIC DEVICE, WIRELESS POWER TRANSMISSION DEVICE, AND POWER TRANSMISSION METHOD THEREOF

• US 20100301678A1
• Filed: 10/20/2009
• Published: 12/02/2010
• Est. Priority Date: 05/28/2009
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: LEE, MYUNG LAE, KIM, YONG HAE, LEE, JONG-MOO, CHEON, SANG HOON, ZYUNG, TAEHYOUNG, KANG, SEUNG YOUL
• Granted Patent: US 8,110,949 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• 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 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H02J 7/00309 Overheat or overtemperature protection

Abstract

Provided is a wireless power transmission device. The wireless power transmission device includes a power coil in which a high frequency current is applied, a transmission coil in which the high frequency current is induced by magnetic induction, the transmission coil configured to generate an non-radiative electromagnetic wave when the transmission coil has the same resonant frequency as an at least one external target device, and a resonant frequency regulator configured to regulate the resonant frequency of the transmission coil. The wireless power transmission device can transmit the power when it has the same resonant frequency as the target device. Therefore, the overheating due to an eddy current may not occur, and the design may be easily varied.

Claims

1. A wireless power transmission device, comprising:

a power coil in which a high frequency current is applied;

a transmission coil in which the high frequency current is induced by magnetic induction, the transmission coil configured to generate an non-radiative electromagnetic wave when the transmission coil has the same resonant frequency as an at least one external target device; and

a resonant frequency regulator configured to regulate the resonant frequency of the transmission coil.

2. The wireless power transmission device of claim 1, wherein the resonant frequency regulator adjusts a distance between the transmission coils to correct the resonant frequency of the transmission coil.

3. The wireless power transmission device of claim 1, wherein the resonant frequency regulator corrects the resonant frequency of the transmission coil by inserting a dielectric between the transmission coils.

4. An electric device for receiving a power from a wireless power transmission device, comprising:

a receiving coil is inserted into a PC board 211 instantly melted using ultrasonic waves which is configured to receive the power through a non-radiative electromagnetic wave generated from the wireless power transmission device when the receiving coil has the same resonant frequency as the wireless power transmission device; and

a loading coil configured to receive the power from the receiving coil by a magnetic induction to supply the power to each of target devices,

wherein the receiving coil has a spiral structure.