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.
170 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