INDUCTIVE POWER SUPPLY WITH DUTY CYCLE CONTROL
First Claim
1. An inductive power supply for providing power wirelessly to a remote device, said inductive power supply comprising:
- a primary circuit for generating a signal at an operating frequency and a duty cycle;
a tank circuit in electrical communication with said primary circuit, wherein said primary circuit applies said signal to said tank circuit to transfer an amount of power to said remote device;
wherein said inductive power supply receives feedback from said remote device;
wherein, in response to said feedback, said primary circuit controls said operating frequency of said signal to optimize power transfer efficiency between said inductive power supply and said remote device; and
wherein, in response to said feedback, said primary circuit controls said duty cycle of said signal to control said amount of power transferred to said remote device.
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Accused Products
Abstract
An inductive power supply that maintains resonance and adjusts duty cycle based on feedback from a secondary circuit. A controller, driver circuit and switching circuit cooperate to generate an AC signal at a selected operating frequency and duty cycle. The AC signal is applied to the tank circuit to create an inductive field for powering the secondary. The secondary communicates feedback about the received power back to the primary controller. The power transfer efficiency may be optimized by maintaining the operating frequency substantially at resonance, and the amount of power transferred may be controlled by adjusting the duty cycle.
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Citations
20 Claims
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1. An inductive power supply for providing power wirelessly to a remote device, said inductive power supply comprising:
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a primary circuit for generating a signal at an operating frequency and a duty cycle; a tank circuit in electrical communication with said primary circuit, wherein said primary circuit applies said signal to said tank circuit to transfer an amount of power to said remote device; wherein said inductive power supply receives feedback from said remote device; wherein, in response to said feedback, said primary circuit controls said operating frequency of said signal to optimize power transfer efficiency between said inductive power supply and said remote device; and wherein, in response to said feedback, said primary circuit controls said duty cycle of said signal to control said amount of power transferred to said remote device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An inductive power supply system comprising:
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an inductive power supply including; a primary circuit for generating a signal at an operating frequency and a duty cycle; and a tank circuit in electrical communication with said primary circuit, wherein said primary circuit applies said signal to said tank circuit to transfer an amount of power to said remote device; a remote device separable from said inductive power supply for receiving power from said inductive power supply, said remote device including; a secondary energized by said inductive field, a load in electrical communication with said secondary, a sensor in electrical communication with said secondary, a secondary controller in electrical communication with said sensor, and a communication device in electrical communication with said secondary controller for sending feedback to said inductive power supply; wherein, in response to said feedback, said primary circuit controls said operating frequency of said signal to optimize power transfer efficiency between said inductive power supply and said remote device; and wherein, in response to said feedback, said primary circuit controls said duty cycle of said signal to control said amount of power transferred to said remote device. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for transferring power from an inductive power supply to a remote device, said method comprising:
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setting an initial operating frequency of a signal in said inductive power supply; setting an initial duty cycle of said signal in said inductive power supply; applying said signal to a tank circuit for transferring an amount of power from said inductive power supply to a remote device; receiving, in said inductive power supply, feedback from said remote device; adjusting, in response to said feedback, said operating frequency of said signal to optimize power transfer efficiency between said inductive power supply and said remote device; adjusting, in response to said feedback, said duty cycle of said signal to control said amount of power transferred to said remote device. - View Dependent Claims (18, 19, 20)
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Specification