BATTERY CHARGING METHOD AND SYSTEM USING WIRELESS POWER TRANSMISSION

• US 20140152247A1
• Filed: 07/30/2013
• Published: 06/05/2014
• Est. Priority Date: 12/03/2012
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: KIM, Seong Min, CHO, In Kui, YUN, Je Hoon, MOON, Jung Ick, CHEON, Sang Hoon
• Granted Patent: US 9,293,943 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency 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 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge

Abstract

Provided is a battery charging method using wireless power transmission, the method including: receiving a first message associated with a battery charge start from a reception apparatus; discovering an optimal frequency band for a transmit power signal to be transmitted to the reception apparatus based on the first message; receiving, from the reception apparatus, a second message that includes an extra power value and a charge power value, and is associated with a charge state of the reception apparatus; and adaptively controlling transmit power so that the extra power value is maintained to be constant in proportion to a relationship between the charge power value and a first parameter, based on the second message.

Claims

1. A battery charging method using wireless power transmission, the method comprising:

receiving a first message associated with a battery charge start from a reception apparatus;

discovering an optimal frequency band for a transmit power signal to be transmitted to the reception apparatus based on the first message;

receiving, from the reception apparatus, a second message that comprises an extra power value and a charge power value, and is associated with a charge state of the reception apparatus; and

adaptively controlling transmit power so that the extra power value is maintained to be constant in proportion to a relationship between the charge power value and a first parameter, based on the second message.

2. The method of claim 1, wherein

the receiving of the second message comprises:

continuously receiving the second message based on predetermined interval information, and

the controlling comprises;

updating the charge power value and the extra power value from the second message; and

adaptively adjusting the transmit power so that the extra power value is maintained to be constant in proportion to the relationship between the charge power value and the first parameter, based on the updated charge power value and the extra power value.

3. The method of claim 1, wherein

the second message further comprises at least one of a set comprising a battery voltage value and a charge current value and a set comprising a battery current value and a charge voltage value, and a transmit power value, and

the controlling comprises:

setting an initial transmit power value based on at least one of the set comprising the battery voltage value and the charge current value and the set comprising the battery current value and the charge voltage value.

4. The method of claim 3, further comprising:

adaptively adjusting the transmit power value in response to a second parameter preset from an initial transmit power value adjusted.

5. The method of claim 1, wherein the controlling comprises:

transmitting the transmit power controlled based on the second message.

6. The method of claim 1, wherein the charge power is power that is input to a battery of the reception apparatus, excluding extra power of the reception apparatus from the transmit power.

7. The method of claim 1, wherein the controlling comprises:

suspending transmission of the transmit power based on the second message.

8. The method of claim 7, wherein the suspending comprises:

updating the number of full charge in at least one of a case in which a battery voltage value increases to be greater than a predetermined full charge battery voltage value and a case in which a battery current value increases to be greater than a predetermined full charge current value; and

suspending the transmission of the transmit power by comparing the updated number of full charge with a third parameter.

9. The method of claim 7, wherein the suspending comprises:

receiving, from the reception apparatus, a third message associated with charge suspension of the reception apparatus; and

suspending the transmission of the transmit power based on the third message.

10. The method of claim 1, wherein the receiving of the first message comprises:

receiving an identification message of the reception apparatus from the reception apparatus.

11. The method of claim 1, further comprising:

transmitting the first message associated with the battery charge start to a transmission apparatus;

measuring a transmit power value received from the transmission apparatus, the charge power value, and the extra power value;

transmitting, to the transmission apparatus, the second message that comprises the extra power value and the charge power value, and is associated with the charge state of the reception apparatus; and

receiving, from the transmission apparatus, the transmit power adaptively controlled so that the extra power value is maintained to be constant in proportion to the relationship between the charge power value and the first parameter, based on the second message.

12. The method of claim 11, wherein the measuring comprises:

colleting the extra power.

13. A battery charging system using wireless power transmission, the system comprising:

a transmission apparatus; and

a reception apparatus,

wherein the transmission apparatus receives a first message associated with a battery charge start from a reception apparatus, discovers an optimal frequency band for a transmit power signal to be transmitted to the reception apparatus based on the first message, receives, from the reception apparatus, a second message that comprises an extra power value and a charge power value, and is associated with a charge state of the reception apparatus, and adaptively controls transmit power to so that the extra power value is maintained to be constant in proportion to a relationship between the charge power value and a first parameter, based on the second message.

14. The system of claim 13, wherein the transmission apparatus continuously receives the second message based on predetermined interval information, updates the charge power value and the extra power value from the second message, and adaptively adjusts the transmit power so that the extra power value is maintained to be constant in proportion to the relationship between the charge power value and the first parameter, based on the updated charge power value and the extra power value.

15. The system of claim 13, wherein the transmission apparatus transmits the transmit power controlled based on the second message, and suspends transmission of the transmit power based on the second message.

16. The system of claim 13, wherein the reception apparatus transmits the first message associated with the battery charge start to a transmission apparatus, measures a transmit power value received from the transmission apparatus, the charge power value, and the extra power value, transmits, to the transmission apparatus, the second message that comprises the extra power value and the charge power value, and is associated with the charge state of the reception apparatus, and receives, from the transmission apparatus, the transmit power adaptively controlled so that the extra power value is maintained to be constant in proportion to the relationship between the charge power value and the first parameter, based on the second message.