Packaging and details of a wireless power device
First Claim
Patent Images
1. A wireless power transmitter, comprising:
- a magnetically resonant antenna configured to receive a driving signal causing a current to flow through the magnetically resonant antenna;
a transmit circuit configured to generate the driving signal at a frequency that is substantially equal to a resonant frequency of the magnetically resonant antenna; and
a current sensor configured to sense an amount of the current and generate a current sense signal indicative of a degree of coupling or decoupling by the magnetically resonant antenna, the transmit circuit being configured to change the driving signal based on the current sense signal.
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Abstract
A wireless power system includes a power source, power receiver, and components thereof. A current sensor senses the amount of current through the antenna. That amount of current is then used to adjust characteristics of the transmitting or receiving.
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Citations
53 Claims
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1. A wireless power transmitter, comprising:
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a magnetically resonant antenna configured to receive a driving signal causing a current to flow through the magnetically resonant antenna; a transmit circuit configured to generate the driving signal at a frequency that is substantially equal to a resonant frequency of the magnetically resonant antenna; and a current sensor configured to sense an amount of the current and generate a current sense signal indicative of a degree of coupling or decoupling by the magnetically resonant antenna, the transmit circuit being configured to change the driving signal based on the current sense signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless power receiver, comprising:
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a magnetically resonant antenna configured to wirelessly receive a signal causing a current to flow through the magnetically resonant antenna; a receive circuit configured to receive the signal at a frequency that is substantially equal to a resonant frequency of the magnetically resonant antenna, the receive circuit being further configured to generate electrical power from the signal at a level sufficient to power or charge a load; and a current sensor configured to sense an amount of the current and configured to generate a current sense signal indicative thereof, the receive circuit being configured to change a reception characteristic based on the current sense signal from the current sensor. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for controlling wireless power reception, comprising:
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receiving a wireless magnetic signal at an antenna causing a current to flow through the antenna, the antenna being configured to be tuned to a resonant frequency at a first frequency; converting the wireless magnetic signal to electric power at a level sufficient to power or charge a load using electrical circuitry connected to the antenna; sensing an amount of the current; generating a current sense signal indicative thereof; and changing a characteristic of the electrical circuitry to improve an interface with a source of the wireless magnetic signal based on the current sense signal. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for controlling wireless power transmission, comprising
converting electrical power to a driving signal at a first frequency using electrical circuitry; -
driving an antenna with the driving signal to wirelessly transmit a magnetic signal via an antenna which is tuned to have a resonant frequency at substantially the first frequency; sensing an amount of current that flows through the antenna; generating a current sense signal indicative of a degree of coupling or decoupling of the antenna; and changing a characteristic of the electrical circuitry to adjust a driving signal based on the current sense signal. - View Dependent Claims (32, 33, 34, 35, 36)
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37. A wireless power receiver, comprising
a magnetically resonant antenna; - and
a receive circuit configured to receive a signal at a frequency that is substantially equal to a resonant frequency of the magnetically resonant antenna, the receive circuit being further configured to generate electrical power from the signal at a level sufficient to power or charge a load, the receive circuit including a control unit configured to change a characteristic of electrical power to improve matching with the magnetically resonant antenna, the receive circuit comprising a synchronous rectifier. - View Dependent Claims (38, 39, 40, 41, 42)
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43. A wireless power receiver, comprising:
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means for receiving a wireless magnetic signal at an antenna, the antenna having a resonant frequency and being configured to be tunable to the resonant frequency; means for converting the wireless magnetic signal into electric power, the signal being at a level sufficient to charge or power a load; means for sensing an amount of current flowing through the means for receiving the wireless magnetic signal; means for generating a current sense signal indicative of the amount of current flowing; and means for changing a characteristic of the means for converting the wireless magnetic signal to improve an interface with a source of the wireless magnetic signal based on the current sense signal. - View Dependent Claims (44, 45)
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46. A wireless power transmitter, comprising means for wirelessly transmitting power at a level sufficient to charge or power a load of a receiver device, the means for wirelessly transmitting power having a resonant frequency;
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means for generating a driving signal at a frequency that is substantially equal to the resonant frequency; means for sensing an amount of current that flows through the means for wirelessly transmitting power; means for generating a current sense signal indicative of a degree of coupling or decoupling of the means for wirelessly transmitting power; and means for changing the driving signal based on the current sense signal. - View Dependent Claims (47)
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48. A method for receiving wireless power, comprising:
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receiving a signal from a magnetically resonant antenna at a receive circuit at a frequency that is substantially equal to a resonant frequency of the magnetically resonant antenna, the receive circuit comprising a synchronous rectifier; generating electrical power from the signal at a level sufficient to power or charge a load; and changing a characteristic of electrical power to improve matching with the magnetically resonant antenna. - View Dependent Claims (49, 50)
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51. A wireless power receiver, comprising:
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means for receiving a signal at a frequency that is substantially equal to a resonant frequency of a magnetically resonant antenna; means for generating electrical power from the signal at a level sufficient to power or charge a load; and means for changing a characteristic of electrical power to improve matching with the receiving means, the means for changing the characteristic comprising means for changing a frequency of a synchronous rectifier. - View Dependent Claims (52)
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53. A wireless power receiver comprising:
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a magnetically resonant antenna; a receive circuit configured to receive a signal at a frequency that is substantially equal to a resonant frequency of the magnetically resonant antenna, the receive circuit being further configured to generate electrical power from the signal at a level sufficient to power or charge a load; a power indicator meter; and a controller configured to change the signal based on an output of the power indicator meter.
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Specification