ENERGY TRANSMISSION APPARATUS AND METHOD

• US 20130187478A1
• Filed: 09/30/2011
• Published: 07/25/2013
• Est. Priority Date: 09/30/2010
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Bae, Su Ho, Lee, Ki Min
• Granted Patent: US 9,866,065 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/50 using additional energy repeaters between transmitting devices and receiving devices
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

An apparatus and method for wirelessly transmitting electromagnetic energy are provided. The apparatus includes a power source, a transmission unit, and a measurement unit. The power source supplies a power according to a certain frequency. The transmission unit receives the power to wirelessly transmit the received power through self resonance. The measurement unit measures a phase difference between a voltage and current of the transmission unit. The certain frequency is controlled according to the phase difference. Accordingly, the apparatus and method control only the frequency of the power supply when a resonance frequency is changed by the change of an ambient environment, thus enhancing energy transmission efficiency.

Claims

1. A wireless power transmission apparatus comprising:

a power source supplying a power according to a certain frequency;

a transmission unit receiving the power to wirelessly transmit the received power through self resonance; and

a measurement unit measuring a phase difference between a voltage and current of the transmission unit,

wherein the certain frequency is controlled according to the phase difference.

2. The wireless power transmission apparatus according to claim 1, wherein,

the transmission unit comprises a transmission coil which generates a magnetic field, and

the measurement unit measures the phase difference between the voltage and current which are inputted to the transmission coil.

3. The wireless power transmission apparatus according to claim 2, wherein the transmission unit comprises a transmission resonance coil which amplifies the magnetic field generated by the transmission coil by resonating the magnetic field.

4. The wireless power transmission apparatus according to claim 3, wherein in an entire system comprising an energy transmission apparatus and an energy consumption apparatus,

the certain frequency (w) is expressed as Equation below,

5. The wireless power transmission apparatus according to claim 1, wherein the energy is transmitted by non-radiative scheme.

6. A method of transmitting electromagnetic energy, the method comprising:

supplying a power according to a certain frequency;

receiving, by a transmission unit, the power to generate magnetic field energy and transmit the magnetic field energy to an energy consumption apparatus; and

measuring a phase difference between a voltage and current of the transmission unit,

wherein the certain frequency is controlled according to the phase difference.

7. The method according to claim 6, further comprising receiving, by a reception unit, the magnetic field energy from the transmission unit to transmit the magnetic field energy to the energy consumption apparatus.

8. The method according to claim 7, wherein the reception unit is configured in plurality.

9. The method according to claim 6, wherein,

the transmission unit comprises a transmission coil which generates a magnetic field, and

the measuring of a phase difference measures the phase difference between the voltage and current which are inputted to the transmission coil.

10. The method according to claim 6, wherein in an entire system comprising an energy transmission apparatus and the energy consumption apparatus,

the certain frequency (ω

) is expressed as Equation below,

11. The method according to claim 6, wherein the energy is transmitted by a non-radiative scheme.