WIRELESS POWER TRANSFER SYSTEM FOR FREELY-MOVING ANIMAL EXPERIMENTS
First Claim
1. A method comprising:
- generating, via a generator coil, an electro-magnetic field for transmitting power to a mobile wireless power receiver;
receiving, from the mobile wireless power receiver, magnetic field information detected at the mobile wireless power receiver;
upon detecting a change in the electro-magnetic field based on the magnetic field information, deriving a timing signal from the electro-magnetic field; and
controlling a frequency at which a polarity of voltage across the generator coil oscillates based on the timing signal, so that the electro-magnetic field generator oscillates at its resonant frequency.
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Accused Products
Abstract
Disclosed herein are systems and methods for wirelessly transmitting power to receivers that are freely mobile, such as power receivers for sensors attached to animal experiments. An example transmitter includes a resonator including a generator and transmitter coil, an initial drive signal generator that removes the generator from an ‘off’ state thereby causing the transmitter coil to create an alternating magnetic field that oscillates within a threshold of a resonant frequency of the generator, a phase detector that receives a signal from a receiver coil receiving power via the magnetic field, and a transition module that switches from the initial drive signal to a drive signal generated based on output from the phase detector. An example wireless power receiver has three turns of wire, one on each axis, around a ferrite plate, the outputs of which are connected in parallel to produce a combined output power signal.
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Citations
20 Claims
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1. A method comprising:
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generating, via a generator coil, an electro-magnetic field for transmitting power to a mobile wireless power receiver; receiving, from the mobile wireless power receiver, magnetic field information detected at the mobile wireless power receiver; upon detecting a change in the electro-magnetic field based on the magnetic field information, deriving a timing signal from the electro-magnetic field; and controlling a frequency at which a polarity of voltage across the generator coil oscillates based on the timing signal, so that the electro-magnetic field generator oscillates at its resonant frequency. - View Dependent Claims (2, 3, 4)
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5. A wireless power transmitter comprising:
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a resonator comprising a generator and a transmitter coil; an initial drive signal generator which applies an initial drive signal comprising an alternating current signal, the initial drive signal removing the generator from an off state thereby causing the transmitter coil to create an alternating magnetic field that oscillates within a threshold of a resonant frequency of the generator; a phase detector that receives a signal from a receiver coil receiving power via the alternating magnetic field from the transmitter coil; and a transition module that switches from the initial drive signal to a drive signal generated based on output from the phase detector. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A wireless power receiver comprising:
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a ferrite plate; a first antenna comprising a first set of turns of wire around the ferrite plate in an X axis; a second antenna comprising a second set of turns of wire around the ferrite plate in a Y axis; a third antenna comprising a third set of turns of wire around the ferrite plate in a Z axis; wherein the first antenna, the second antenna, and the third antenna produce outputs when in the presence of an alternating magnetic field generated by a transmitter coil; and a connector that connects the outputs in parallel to produce a combined output signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification