SYSTEM AND METHOD FOR INDUCTIVELY CHARGING A BATTERY
First Claim
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1. An inductive charging system comprising:
- a primary circuit including a power source, a controller electrically coupled to said power source and a primary electrically coupled to said controller, wherein said controller applies power with a frequency to said primary from said power source;
a secondary circuit including a secondary inductively coupled to said primary, a feedback circuit electrically coupled to said secondary and a battery electrically coupled to said secondary;
wherein said feedback circuit communicates feedback to said primary circuit via said inductive coupling; and
wherein said controller controls a characteristic of said power applied to said primary at least partially in response to said feedback from said feedback circuit.
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Abstract
An inductive charging system for recharging a battery. The system includes a charger circuit and a secondary circuit. The secondary circuit includes a feedback mechanism to provide feedback to the charger circuit through the inductive coupling of the primary coil and the secondary coil. The charger circuit includes a frequency control mechanism for controlling the frequency of the power applied to the primary coil at least partly in response to the feedback from the feedback mechanism.
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Citations
20 Claims
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1. An inductive charging system comprising:
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a primary circuit including a power source, a controller electrically coupled to said power source and a primary electrically coupled to said controller, wherein said controller applies power with a frequency to said primary from said power source; a secondary circuit including a secondary inductively coupled to said primary, a feedback circuit electrically coupled to said secondary and a battery electrically coupled to said secondary; wherein said feedback circuit communicates feedback to said primary circuit via said inductive coupling; and wherein said controller controls a characteristic of said power applied to said primary at least partially in response to said feedback from said feedback circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for operating an inductive charging system according to a charging profile, said inductive charging system having a charger circuit with a primary coil and a secondary circuit with a secondary coil and a battery, the method comprising the steps of:
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defining an over-voltage condition and over-current condition according to the charging profile; applying power to the primary coil at a frequency; generating a feedback signal in the secondary circuit in response to the over-voltage or the over-current condition being met; evaluating the feedback signal from the secondary circuit through the primary coil and secondary coil inductive coupling; and adjusting the frequency of the power applied to the primary coil as a function of the feedback from the secondary circuit. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A portable electronic device with a secondary circuit having a reflected impedance, said portable electronic device comprising:
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a secondary coil; a battery electrically coupled to said secondary coil; and a feedback circuit electrically coupled to said secondary coil wherein said feedback circuit varies the reflected impedance of said secondary circuit to generate a feedback signal in said secondary coil in response to an over-voltage or over-current condition. - View Dependent Claims (19, 20)
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Specification