Methods and devices for controlling wireless power transfer levels
First Claim
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1. A device, comprising:
- a coil defining a coil axis;
a tank capacitor electrically coupled to the coil and wherein the coil and the tank capacitor define a resonant frequency;
a rectifier coupled to the coil so as to receive and rectify an electrical voltage induced in the coil;
four switching capacitors electrically coupled to the tank capacitor, wherein two switching capacitors are configured to tune the device when heat increases due to high induced current, one switching capacitor is configured to tune the device, and one switching capacitor is configured to compensate any decreasing secondary capacitance of the tank capacitor; and
a microcontroller electrically coupled to the four switching capacitors so as to tune or detune the resonant frequency established by the coil, the tank capacitor, and the four switching capacitors.
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Abstract
Disclosed herein are embodiments of novel WPT systems, devices, and methods of using the same. Also disclosed herein are methods for controlling the power delivered from a stationary source (e.g., a primary coil) to a moving telemetric device (e.g., a secondary coil) via magnetic resonance coupling. The systems, device, and methods described herein can be used to tune and/or detune resonant frequency between a primary coil and a telemetric device so as to prevent device malfunction and/or tissue damage for the small animals associated with the telemetric device.
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Citations
20 Claims
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1. A device, comprising:
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a coil defining a coil axis; a tank capacitor electrically coupled to the coil and wherein the coil and the tank capacitor define a resonant frequency; a rectifier coupled to the coil so as to receive and rectify an electrical voltage induced in the coil; four switching capacitors electrically coupled to the tank capacitor, wherein two switching capacitors are configured to tune the device when heat increases due to high induced current, one switching capacitor is configured to tune the device, and one switching capacitor is configured to compensate any decreasing secondary capacitance of the tank capacitor; and a microcontroller electrically coupled to the four switching capacitors so as to tune or detune the resonant frequency established by the coil, the tank capacitor, and the four switching capacitors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system, comprising:
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a primary circuit comprising (i) a primary coil defining a primary coil axis; and
(ii) a primary tank capacitor coupled to the primary coil; anda secondary circuit comprising (i) a secondary coil defining a secondary coil axis;
(ii) a secondary tank capacitor;
wherein the secondary coil and the secondary tank capacitor define a resonant frequency;
(iv) a rectifier coupled to the secondary coil so as to receive and rectify an electrical voltage induced in the secondary coil by the primary coil;
(v) four switching capacitors electrically coupled to the tank capacitor, wherein two switching capacitors are configured for tuning in response to high induced current, one switching capacitor is configured to tune the with respect to the primary circuit, and one switching capacitor is configured to compensate any decreasing secondary capacitance of the secondary tank capacitor; and
(vi) a microcontroller electrically coupled to the four switching capacitors so as to tune or detune a secondary resonant frequency of the secondary circuit with respect to a primary resonant frequency associated with the primary coil and the primary tank capacitor. - View Dependent Claims (12)
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13. A method, comprising:
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inducing an oscillating voltage in a secondary circuit with an oscillating electromagnetic field in a primary circuit, wherein the secondary circuit is part of a telemetric device associated with an animal and the primary circuit is part of a cage in which the animal is physically confined; measuring a voltage associated with the oscillating voltage in the secondary circuit with a microcontroller using an analog input; and providing four switching capacitors in the secondary circuit, wherein two switching capacitors are configured for tuning in response to high induced current, one switching capacitor is configured to tune the with respect to the primary circuit, and one switching capacitor is configured to compensate any decreasing secondary capacitance of a secondary tank capacitor; and adjusting a resonant frequency difference between the secondary circuit and the primary circuit based on the measured voltage with one or more of the four switching capacitors. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification