System and method for preventing cross connection in wireless charging

Patent metadata

Field	Value
Publication number	US-2019296583-A1
Application number	US-201815935068-A
Country	US
Kind code	A1
Filing date	Mar 26, 2018
Priority date	Mar 26, 2018
Publication date	Sep 26, 2019
Grant date	—

Abstract

A wireless power transmitter that supplies power to a wireless power receiver. The wireless power transmitter includes a control unit, a resonator and an amplifier. The control unit generates an identification information of the wireless power transmitter. The resonator transmits power to the wireless power receiver. The amplifier drives the resonator and is controlled by the control unit such that the power transmitted by the resonator includes a first signal that carries the identification information of the wireless power transmitter. The wireless power transmitter further includes a wireless communication unit that sends a second signal having the identification information of the wireless power transmitter. The wireless communication unit receives a third signal that is generated from the wireless receiver based on the first and second signals to determine whether to establish power connection in order to prevent cross connection between the wireless power transmitter and the wireless power receiver when the wireless power receiver is not charged by the wireless power transmitter.

First claim

What is claimed is:

1 . A wireless power transmitter that supplies power to a wireless power receiver, the wireless power transmitter comprising:
a control unit that generates an identification information of the wireless power transmitter; a resonator that transmits power to the wireless power receiver; an amplifier that drives the resonator and is controlled by the control unit such that the power transmitted by the resonator includes a first signal that carries the identification information of the wireless power transmitter; and a wireless communication unit that sends a second signal comprising the identification information of the wireless power transmitter; wherein the wireless communication unit receives a third signal from the wireless power receiver based on the first and second signals to determine whether to establish power connection in order to prevent cross connection between the wireless power transmitter and the wireless power receiver when the wireless power receiver is not charged by the wireless power transmitter.

2 . The wireless power transmitter of the claim 1 , wherein the wireless power receiver compares the second signal sent from the wireless power transmitter with the first signal to determine whether to establish the power connection with the wireless power transmitter.

3 . The wireless power transmitter of the claim 1 , wherein the third signal is sent from a wireless communication unit of the wireless power receiver to the wireless communication unit of the wireless power transmitter, the third signal triggering the power connection between the wireless power receiver and the wireless power transmitter when the first signal matches the second signal.

4 . The wireless power transmitter of the claim 1 , wherein the third signal initiates a disconnection of a communication link between the wireless communication unit of the wireless power transmitter and a wireless communication unit of the wireless power receiver when the first signal does not match the second signal.

5 . The wireless power transmitter of the claim 1 , wherein the first signal carries the identification information of the wireless power transmitter by varying a power level of the power transmitted by the resonator, the first signal including a preamble and a signature, the preamble including a highest power level and a lowest power level, the signature carrying the identification information of the wireless power transmitter and including at least one power level between the highest power level and the lowest power level.

6 . The wireless power transmitter of the claim 1 , wherein the first signal carries the identification information of the wireless power transmitter by transmitting the power from the resonator in different power levels, the power levels are predetermined and include a highest power level, a lowest power level and a number of power levels with a common difference.

7 . The wireless power transmitter of the claim 1 , wherein the wireless power receiver senses different power levels from the wireless power transmitter and obtains the first signal that carries the identification information of the wireless power transmitter by comparing the power levels with a lowest power level and a highest power level, and wherein the lowest and highest power levels are included in the first signal as a preamble.

8 . A wireless power transmitter that supplies power to a wireless power receiver, the wireless power transmitter comprising:
a control unit that generates an identification information of the wireless power transmitter; a resonator that transmits power to the wireless power receiver; and an amplifier that drives the resonator and is controlled by the control unit such that the power transmitted by the resonator includes a first signal that carries an identification information of the wireless power transmitter, wherein the first signal carries the identification information of the wireless power transmitter by transmitting the power from the resonator in different power levels, the power levels are predetermined and include a highest power level, a lowest power level and a number of power levels with a common difference, and wherein the wireless power transmitter receives a second signal from the wireless power receiver to determine whether to establish power connection with the wireless power receiver in order to prevent cross connection between the wireless power transmitter and the wireless power receiver.

9 . The wireless power transmitter of the claim 8 , wherein the wireless power receiver senses different power levels from the wireless power transmitter and obtains the first signal that carries the identification information of the wireless power transmitter by comparing the power levels with a lowest power level and a highest power level, and wherein the lowest and highest power levels are included in the first signal as a preamble.

10 . The wireless power transmitter of the claim 8 , wherein the second signal includes the identification information of the wireless power transmitter and a signature of the wireless power receiver.

11 . The wireless power transmitter of the claim 8 , wherein the second signal is generated by a control unit in the wireless power receiver, the control unit controlling a load current to vary a load impedance such that the second signal is carried by a variation of the load impedance.

12 . The wireless power transmitter of the claim 8 compares the second signal with the first signal, establishes the power connection with the wireless power receiver when the second signal matches the first signal, or disconnects with the wireless power receiver when the second signal does not match the first signal.

13 . The wireless power transmitter of the claim 8 , wherein the first signal carries the identification information of the wireless power transmitter by varying a power level of the power transmitted by the resonator, the first signal including a preamble and a signature, the preamble including a highest power level and a lowest power level, the signature carrying the identification information of the wireless power transmitter and including one or more power levels between the highest power level and the lowest power level.

14 . A method of preventing cross connection in wireless charging between a wireless power transmitter and a wireless power receiver, the method comprising:
generating, by a control unit of the wireless power transmitter, an identification information of the wireless power transmitter; sending, from a resonator of the wireless power transmitter, a first signal that includes the identification information of the wireless power transmitter by transmitting power from the resonator in different power levels; and determining, based a comparison result between the first signal and a second signal, whether to establish power connection between the wireless power transmitter and the wireless power receiver in order to prevent cross connection between the wireless power transmitter and the wireless power receiver when the wireless power receiver is not charged by the wireless power transmitter, wherein the power levels are predetermined and include a highest power level, a lowest power level and a number of power levels with a common difference.

15 . The wireless power transmitter of the claim 14 , wherein the wireless power receiver senses different power levels from the wireless power transmitter and obtains the first signal that carries the identification information of the wireless power transmitter by comparing the power levels with t

Assignees

• Hong Kong Applied Science & Tech Research Inst Co Ltd

Inventors

• So Iek Po
• Lee Hang Sang
• Chen Jun

Classifications

• H02J50/80

  involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices · CPC title

• H04W76/30

  Connection release · CPC title

• H02J50/12 Primary

  of the resonant type · CPC title

• H02J7/025

  Electricity · mapped topic