Unified inductive digital protocol

Patent metadata

Field	Value
Publication number	US-2017194815-A1
Application number	US-201515309632-A
Country	US
Kind code	A1
Filing date	May 8, 2015
Priority date	May 8, 2014
Publication date	Jul 6, 2017
Grant date	—

Abstract

A wireless power receiver, configured to inductively receive power from a wireless power outlet for powering a load, and to encode a signal for detection by the wireless power outlet, is provided. The wireless power receiver comprising a receiver circuit having a secondary coil connected to the load and configured to receive power from a primary coil associated with the wireless power outlet, and a resonance adjuster electrically connected to the secondary coil and configured to adjust the resonant frequency of the receiver circuit, between one of two resonant frequencies, by selectively modifying the receiver circuit. The wireless power receiver further comprises a controller configured to operate the resonance adjuster to encode the signal by adjusting the resonant frequency of the receiver circuit, wherein the signal comprises a plurality of data blocks carrying information, alternating with a plurality of power blocks each carrying a power instruction.

First claim

1 - 101 . (canceled)

102 . A wireless power receiver configured to inductively receive power from a wireless power outlet for powering a load, and configured to encode a signal for detection by said wireless power outlet, said wireless power receiver comprising a receiver circuit having:
a secondary coil connected to said load and configured to receive power from a primary coil associated with said wireless power outlet; and a state modifier electrically connected to said secondary coil and configured to adjust a circuit characteristic of the receiver circuit, between one of two states, by selectively modifying the receiver circuit; said wireless power receiver further comprising a controller configured to operate said state modifier to encode said signal by adjusting the circuit characteristic of the receiver circuit, wherein said signal comprises a plurality of data blocks carrying information, alternating with a plurality of power blocks each carrying a power instruction.

103 . The wireless power receiver according to claim 102 , wherein each of said power instructions is selected from the group consisting of:
to increase the operating frequency of the wireless power outlet; to decrease the operating frequency of the wireless power outlet; and to continue operation of the wireless power outlet with no change in operating frequency.

104 . The wireless power receiver according to claim 102 , wherein said controller is configured to:
operate said state modifier to encode a first type of power block by keeping circuit characteristic of the receiver circuit constant for the duration of the power block; operate said state modifier to encode a second type of power block by changing the circuit characteristic of the receiver circuit between said two circuit characteristics one time during the duration of the power block; and operate said state modifier to encode a third type of power block by changing the circuit characteristic of the receiver circuit between said two circuit characteristics two or more times during the duration of the power block.

105 . The wireless power receiver according to claim 104 , wherein said controller is configured to operate said state modifier to encode said third type of power block by changing the circuit characteristic of the receiver circuit between said two circuit characteristics at a rate of 8 kHz.

106 . The wireless power receiver according to claim 104 , wherein said controller is configured to operate said state modifier to encode said third type of power block by changing the circuit characteristic of the receiver circuit between said two circuit characteristics seven times during the duration of the power block.

107 . The wireless power receiver according to claim 104 , wherein said controller is configured to operate said state modifier to encode said second type of power block by changing the circuit characteristic of the receiver circuit between said two circuit characteristics at a rate of 2 kHz.

108 . The wireless power receiver according to claim 102 , wherein the duration of the power block is about 500 microseconds.

109 . The wireless power receiver according to claim 102 , wherein each of said data blocks and power blocks is of the same time duration.

110 . The wireless power receiver according to claim 102 , wherein said state modifier comprises a circuit element and a switching element configured to modify the receiver circuit by selectively connecting/disconnecting said circuit element to/from said receiver circuit, thereby adjusting the circuit characteristic thereof.

111 . The wireless power receiver according to claim 110 , wherein said circuit element is selected from the group consisting of a resistor, a capacitor, and an inductor.

112 . The wireless power receiver according to claim 110 , wherein said controller is configured to operate said state modifier to adjust the circuit characteristic of the receiver circuit by directing operation of said switching element.

113 . The wireless power receiver according to claim 102 , configured to be in communication with a host for supplying power thereto, and receiving information therefrom relating to said data and power blocks.

114 . The wireless power receiver according to claim 113 , wherein said power instructions are based on power requirements of said host.

115 . The wireless power receiver according to claim 102 , wherein said signal comprises a preamble immediately preceding said data and power blocks.

116 . The wireless power receiver according to claim 115 , wherein said preamble is of a predetermined length.

117 . A method of encoding a signal, the method comprising:
providing a wireless power receiver having a receiver circuit comprising a resonance adjuster configured to adjust the resonant frequency of the receiver circuit, between one of two resonant frequencies, by selectively modifying the receiver circuit; and encoding said signal by operating the resonance adjuster to adjust the resonant frequency of the receiver circuit; wherein said signal comprises a plurality of data blocks carrying information alternating with a plurality of power blocks each carrying a power instructions.

118 . A digital signal encoded using high and low values, the digital signal comprising a plurality of data blocks carrying information, alternating with a plurality of power blocks each carrying a power instruction for a wireless power outlet.

119 . The digital signal according to claim 118 , wherein each of said power instructions is selected from the group consisting of:
to increase the operating frequency of the wireless power outlet; to decrease the operating frequency of the wireless power outlet; and to continue operation of the wireless power outlet with no change in operating frequency.

120 . The digital signal according to any one of claim 118 , wherein:
a first type of power block is encoded by transmitting one of said values for the duration of the power block; a second type of power block is encoded by changing between said values one time during the duration of the power block; and a first type of power block is encoded by changing between said values two or more times during the duration of the power block.

121 . The digital signal according to claim 120 , wherein said third type of power block is encoded by changing between said values at a rate of 8 kHz.

Assignees

• Powermat Tech Ltd

Inventors

• Mach Elieser
• Koren Yuval
• Raveh Guy
• Moshkovich Oz

Classifications

• H02J50/80

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

• H02J50/12 Primary

  of the resonant type · CPC title