Transmission-guard system and method for an inductive power supply
First Claim
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1. A wireless power transmitter operable to transfer power wirelessly to a wireless power receiver, said wireless power transmitter comprising:
- a primary coil operable to form an inductive couple with a secondary coil associated with said wireless power receiver and to transfer power wirelessly thereto;
a detector operable to activate said wireless power transmitter when a wireless power receiver is brought into proximity therewith;
a driver operable to be triggered by said detector and to provide a driving voltage across said primary coil; and
a peak detector for monitoring transmission voltage of said wireless power transmitter,wherein said detector is operable to detect resonance of said inductive couple, said driver is operable to select a transmission frequency significantly different from a resonant frequency of said inductive couple, and said peak detector is configured to detect large increases in the transmission voltage indicating an increase in resonant frequency.
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Abstract
Wireless power transfer between a power transmitter and a power receiver may include a power transfer established by a detector of the wireless power transmitter detecting a magnetic field from a wireless power receiver in proximity to the wireless power transmitter and activating the wireless power transmitter to transfer power to the wireless power receiver.
133 Citations
15 Claims
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1. A wireless power transmitter operable to transfer power wirelessly to a wireless power receiver, said wireless power transmitter comprising:
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a primary coil operable to form an inductive couple with a secondary coil associated with said wireless power receiver and to transfer power wirelessly thereto; a detector operable to activate said wireless power transmitter when a wireless power receiver is brought into proximity therewith; a driver operable to be triggered by said detector and to provide a driving voltage across said primary coil; and a peak detector for monitoring transmission voltage of said wireless power transmitter, wherein said detector is operable to detect resonance of said inductive couple, said driver is operable to select a transmission frequency significantly different from a resonant frequency of said inductive couple, and said peak detector is configured to detect large increases in the transmission voltage indicating an increase in resonant frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for establishing wireless power transfer from a wireless power transmitter to a wireless power receiver, which method comprises:
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detecting, by a detector of said wireless power transmitter, a magnetic field when said wireless power receiver is in proximity therewith; activating said wireless power transmitter upon detection of the magnetic field; detecting resonance of an inductive couple formed between a primary coil of said wireless power transmitter and a secondary coil of said wireless power receiver; selecting a transmission frequency significantly different from a resonant frequency of said inductive couple; and monitoring transmission voltage of said wireless power transmitter to detect large increases in the transmission voltage. - View Dependent Claims (12, 13, 14, 15)
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Specification