Method for transferring wireless power

• US 9,543,779 B2
• Filed: 04/17/2014
• Issued: 01/10/2017
• Est. Priority Date: 04/17/2013
• Status: Active Grant

• Current Assignee: Hyundai Mobis Co., Ltd.
• Original Assignee: Korea Electronics Technology Institute (Government of South Korea)
• Inventors: Won, Yun Jae, Lim, Seung Ok
• Primary Examiner(s): TAT, BINH C
• Application Number:
  US14/255,641
• Publication Number:
  US 20140312852A1
• Time in Patent Office: 999 Days
• Field of Search: 320137-145
• 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 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• 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 7/00308 Overvoltage protection

Abstract

This invention defines management protocols for wireless power transfer to multiple devices in Multi-device Wireless Power Management System. Various functions of Multi-device Wireless Power Management System are justified from this invention. The WPT frames and messages which work between the management block of a charger and the management block or the coupler block of a device, or the coupler block of a charger are defined as well to execute various functions. Also the procedures for each functionality are described based on its frames and messages.

Claims

1. A method for transferring wireless power using a wireless power transmission apparatus, the method comprising:

transmitting a power transfer request packet to at least one wireless charging device during a request period;

receiving a power transfer response packet from the at least one wireless charging device during a response period;

transmitting, during the response period, a power transfer beacon request packet comprising information on a wireless power transfer schedule to the at least one wireless charging device in response to receiving the power transfer response packet; and

transmitting wireless power to the at least one wireless charging device according to the wireless power transfer schedule during the response period,

wherein the transmitting the power transfer beacon request packet comprises;

dividing the response period into at least one time slot based on a number of the at least one wireless charging device; and

generating the wireless power transfer schedule assigning the at least one time slots to the at least one wireless charging device.

2. The method of claim 1, wherein the transmitting a wireless power to the at least one wireless charging device according to the wireless power transfer schedule during the response period comprises:

calculating distance to the at least one wireless charging device; and

transmitting the wireless power at a power level appropriate for the distance.

3. The method of claim 1, further comprising:

transmitting a power status beacon to the at least one wireless charging device in a power status feedback interval during transmitting the wireless power; and

notifying an abnormal situation to the at least one wireless charging device when sensing the abnormal situation in a power status feedback packet as a response for the power status beacon.

4. The method of claim 3, wherein the power status feedback interval is included in the response period.

5. The method of claim 1, further comprising:

transmitting a power transfer permission command to the at least one wireless charging device;

receiving a power transfer request command from the at least one wireless charging device received the power transfer permission command;

transmitting a power transfer execution command to the at least one wireless charging device when receiving the power transfer request command; and

transmitting a minimal wireless power to the at least one wireless charging device when receiving a power transfer execution command acknowledgement as a response for the power transfer execution command.

6. The method of claim 5, further comprising:

terminating a wireless power transfer to the at least one wireless charging device when the at least one wireless charging device receives power up to a threshold level.

7. The method of claim 1, further comprising:

transmitting a power transfer execution command and a wireless power regularly to the at least one wireless charging device during a spontaneous period until receiving a power level request command acknowledgement for a power level request command.