WIRELESS POWER TRANSMISSION DEVICE, WIRELESS POWER RECEPTION DEVICE AND WIRELESS POWER TRANSMISSION SYSTEM

• US 20150207357A1
• Filed: 07/18/2014
• Published: 07/23/2015
• Est. Priority Date: 01/23/2014
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: YOUM, WooSub, LEE, Sung Q, HWANG, Gunn
• Granted Patent: US 10,008,888 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/15 using ultrasonic waves
• 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 7/00302 Overcharge protection
• CPC Class Codes: H02J 7/007 Regulation of charging or discharging current or voltage
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage

Abstract

Provided is a wireless power transmission system. The wireless power transmission system includes a power supply unit generating amplified power; a wireless power transmission unit receiving and converting the amplified power into wireless power; a wireless power reception unit receiving and converting the wireless power into charging power; and a charging unit receiving the charging power, wherein the charging unit includes a battery to store the charging power and the power supply unit includes a power detection unit identifies the charged state of the battery based on the amplified voltage and amplified current of the amplified power.

Claims

1. A wireless power transmission system comprising:

a power supply unit generating amplified power;

a wireless power transmission unit receiving and converting the amplified power into wireless power;

a wireless power reception unit receiving and converting the wireless power into charging power; and

a charging unit receiving the charging power,

wherein the charging unit comprises a battery to store the charging power and the power supply unit comprises a power detection unit identifies the charged state of the battery based on the amplified voltage and amplified current of the amplified power.

2. The wireless power transmission system of claim 1, wherein a medium layer is provided between the wireless power transmission unit and the wireless power reception unit.

3. The wireless power transmission system of claim 2, wherein the charging unit further comprises a charging control unit that receives the charging power from the wireless power reception unit and converts received charging power into direct current (DC) power, and

the battery is charged by the DC power from the charging control unit.

4. The wireless power transmission system of claim 3, wherein the power detection unit measures a combined impedance that is obtained by summing the impedances of the wireless power transmission unit, the wireless power reception unit, the charging control unit, and the medium layer.

5. The wireless power transmission system of claim 4, wherein the power supply unit further comprises:

a power generation unit generating supply power; and

a power amplification unit receiving and amplifying the supply power to the amplified power,

wherein the power detection unit calculates a supply impedance based on the amplified voltage and the amplified current output from the power amplification unit and calculates the impedance of the battery based on the supply impedance and the combined impedance, and

the supply impedance corresponds to the sum of the combined impedance and the impedance of the battery.

6. The wireless power transmission system of claim 1, wherein the charging unit comprises:

a reference impedance circuit; and

a charging control unit electrically connected to the wireless power reception unit, wherein the charging control unit generates first and second selection signals in response to a preset period and outputs the charging power to any one of the battery and the reference impedance circuit in response to the first and second selection signals.

7. The wireless power transmission system of claim 6, wherein the reference impedance circuit comprises a plurality of reference impedance circuits having different values, and

the charging power is connected to one of the plurality of reference impedance circuits in response to the first selection signal.

8. The wireless power transmission system of claim 6, wherein the charging control unit comprises:

a switching control unit generating the first and second selection signals in response to a preset period; and

a switching unit outputting the charging power to any one of the battery and the reference impedance circuit in response to the first or second selection signal.

9. The wireless power transmission system of claim 6, wherein the power detection unit calculates a combined impedance obtained by summing the impedances of the wireless power transmission unit, the wireless power reception unit, the charging control unit, and the medium layer when the charging power is provided to the reference impedance circuit in response to the second selection signal.

10. The wireless power transmission system of claim 9, wherein the power detection unit calculates a supply impedance based on the amplified voltage and the amplified current output from the power amplification unit and calculates the impedance of the battery based on the combined impedance and the supply impedance when the charging power is provided to the battery according to the first selection signal,

wherein the supply impedance corresponds to the sum of the combined impedance and the impedance of the battery.

11. The wireless power transmission system of claim 6, wherein information on the reference impedance circuit is prestored in the power detection unit.

12. A wireless power transmission device comprising:

a power generation unit generating supply power;

a power amplification unit amplifying the supply power to output amplified power;

a wireless power transmission unit electrically connected to the power amplification unit, wherein the wireless power transmission unit receives and converts the amplified power into wireless power, and externally outputs the wireless power obtained through conversion; and

a power detection unit adjusting the output of the wireless power based on the variations of the amplified voltage and amplified current of the amplified power output from the power amplification unit.

13. The wireless power transmission device of claim 12, further comprising:

a wireless data control unit generating a connect signal in response to the supply power; and

a wireless data transmission unit receiving the connect signal and externally outputting a received connect signal.

14. A wireless power transmission device comprising:

a reference impedance circuit;

a battery;

a wireless power reception unit receiving external wireless power, converting received wireless power into charging power, and outputting charging power; and

a charging control unit electrically connected to the wireless power reception unit, wherein the charging control unit outputs the charging power to the battery in response to a first selection signal and outputs the charging power to the reference impedance circuit in response to a second selection signal.

15. The wireless power reception device of claim 14, wherein charging control unit comprises:

a wireless data reception unit externally receiving a connect signal;

a wireless data control unit generating the first and second selection signals in response to the connect signal; and

a switching unit outputting the charging power to any one of the reference impedance circuit and the battery in response to the first or second selection signal. 20

16. The wireless power reception device of claim 14, wherein charging control unit comprises:

a switching control unit generating the first and second selection signals in response to a preset period; and

a switching unit outputting the charging power to any one of the reference impedance circuit and the battery in response to the first or second selection signal.