Wireless power peer to peer communication
First Claim
Patent Images
1. A first wireless power receiver configured to receive wireless power from a wireless power transmitter at a receive coil via a magnetic field generated by the wireless power transmitter, the first wireless power receiver comprising:
- a switchable element configured to cause a first pulse to be generated to a second receiver based on coupling the receive coil to a ground voltage, the first pulse indicating at least a portion of a first message to the second wireless power receiver, wherein the second wireless power receiver receives wireless power via the magnetic field generated by the wireless power transmitter and wherein coupling the receive coil to the ground voltage increases a first amount of power received at the first wireless power receiver from the wireless power transmitter and decreases a second amount of power received at the second wireless power receiver from the wireless power transmitter; and
a pulse detector coupled to the receive coil and configured to detect a second pulse received from the second wireless power receiver via the magnetic field based on a decrease in power at the receive coil, the second pulse indicating at least a portion of a second message from the second wireless power receiver to the first wireless power receiver.
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Abstract
Exemplary embodiments are directed to wireless power communication. In one aspect a wireless power receiver configured to receive wireless power from a wireless power transmitter is provided. The wireless power receiver includes a switchable element configured to couple a receive coil to a ground voltage. The wireless power receiver further includes a detector coupled to the receive coil and configured to detect an externally generated pulse.
32 Citations
27 Claims
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1. A first wireless power receiver configured to receive wireless power from a wireless power transmitter at a receive coil via a magnetic field generated by the wireless power transmitter, the first wireless power receiver comprising:
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a switchable element configured to cause a first pulse to be generated to a second receiver based on coupling the receive coil to a ground voltage, the first pulse indicating at least a portion of a first message to the second wireless power receiver, wherein the second wireless power receiver receives wireless power via the magnetic field generated by the wireless power transmitter and wherein coupling the receive coil to the ground voltage increases a first amount of power received at the first wireless power receiver from the wireless power transmitter and decreases a second amount of power received at the second wireless power receiver from the wireless power transmitter; and a pulse detector coupled to the receive coil and configured to detect a second pulse received from the second wireless power receiver via the magnetic field based on a decrease in power at the receive coil, the second pulse indicating at least a portion of a second message from the second wireless power receiver to the first wireless power receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A first wireless power receiver, comprising:
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an antenna configured to receive wireless power from a wireless power transmitter via a magnetic field generated by the wireless power transmitter; a pulse detector coupled to the antenna and configured to detect an externally generated pulse caused by a second wireless power receiver via the magnetic field by detecting a decrease in an amount of wireless power received by the antenna from the wireless power transmitter, the externally generated pulse indicating at least a portion of a message from the second wireless power receiver, and the pulse detector including; an envelope detector; at least one transistor coupled to the envelope detector and configured to amplify an envelope output from the envelope detector; and an output coupled to the at least one transistor and configured to generate a logic output. - View Dependent Claims (15, 16)
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17. A method of communication between a first wireless power receiver to a second wireless power receiver, the method comprising:
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providing power from the first wireless power receiver to a chargeable device, the power being received by a receive coil of the first wireless power receiver via a magnetic field; and shorting the receive coil of the first wireless power receiver while charging the chargeable device, to cause a first pulse to be generated to the second wireless power receiver based on coupling the receive coil to a ground voltage, the first pulse indicating at least a portion of a first message to the second wireless power receiver, wherein coupling the receive coil to the ground voltage increases a first amount of power received at the first wireless power receiver from the wireless power transmitter and decreases a second amount of power received at the second wireless power receiver from the wireless power transmitter; and detecting a second pulse using a pulse detector coupled to the receive coil based on a decrease in power at the receive coil, the second pulse received from the second wireless power receiver via the magnetic field generated by the wireless power transmitter and indicating at least a portion of a second message from the second wireless power receiver to the first wireless power receiver. - View Dependent Claims (18, 19, 20)
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21. A method of identifying a first wireless power receiver and communicating a power status of the first wireless power receiver, comprising:
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transmitting a first message type including an identification number usable to identify the first wireless power receiver from the first wireless power receiver to at least one other wireless power receiver via a magnetic field generated by a wireless power transmitter based on coupling a receive coil of the first wireless power receiver to a ground voltage, wherein coupling the receive coil to the ground voltage increases a first amount of power received at the first wireless power receiver from the wireless power transmitter and decreases a second amount of power received at the second wireless power receiver from the wireless power transmitter; adjusting the identification number of the first wireless power receiver in response to receiving a second message type from the at least one other wireless power receiver, the second message type indicating that the identification number is being used by the at least one other wireless power receiver, wherein the second message type is received based on detecting a decrease in power at the receive coil; and transmitting a power message and the adjusted identification number from the first wireless power receiver to the at least one other wireless power receiver based on coupling the receive coil of the first wireless power receiver to the ground voltage. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A first wireless power receiver, comprising:
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means for transmitting a first message type including an identification number usable to identify the first wireless power receiver from the first wireless power receiver to at least one other wireless power receiver via a magnetic field generated by a wireless power transmitter based on coupling a means for receiving wireless power of the first wireless power receiver to a ground voltage, wherein coupling the means for receiving to the ground voltage increases a first amount of power received at the first wireless power receiver from the wireless power transmitter and decreases a second amount of power received at the second wireless power receiver from the wireless power transmitter; means for adjusting the identification number of the first wireless power receiver in response to receiving a second message type from the at least one other wireless power receiver, the second message type indicating that the identification number is being used by the at least one other wireless power receiver, wherein the second message type is received based on detecting a decrease in power at the means for receiving; and means for transmitting a power message and the adjusted identification number from the first wireless power receiver to the at least one other wireless power receiver based on coupling the means for receiving to the ground voltage.
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Specification