Method and system for providing induction charging having improved efficiency
First Claim
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1. A battery charging system for use with an induction charger, comprising:
- a plurality of secondary coils coupled to a corresponding plurality of cells for simultaneously receiving magnetic flux produced by a primary coil of the induction charger when said plurality of secondary coils is placed proximately to a base coupled to the induction charger, each of said plurality of secondary coils having a plurality of turns; and
a corresponding control circuit coupled to each of said plurality of secondary coils for controlling a number of turns of each of said secondary coils for simultaneously charging the plurality of cells.
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Abstract
A battery charging system (250) for use with an induction charger (210). The battery charging system can include a secondary coil (252) having a plurality of turns for receiving magnetic flux produced by a primary coil (220) of the induction charger, and a control circuit (254) for controlling a number of turns of the secondary coil that are used in generating an output voltage for charging a cell (264). For example, the secondary coil can include a plurality of taps (291, 292, 293, 294), each of the taps providing an electrical connection to the coil at a different point, and thus providing a variety of selectable output voltages.
174 Citations
21 Claims
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1. A battery charging system for use with an induction charger, comprising:
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a plurality of secondary coils coupled to a corresponding plurality of cells for simultaneously receiving magnetic flux produced by a primary coil of the induction charger when said plurality of secondary coils is placed proximately to a base coupled to the induction charger, each of said plurality of secondary coils having a plurality of turns; and
a corresponding control circuit coupled to each of said plurality of secondary coils for controlling a number of turns of each of said secondary coils for simultaneously charging the plurality of cells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An induction charging system, comprising:
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(a) an induction charger, comprising;
a base for charging;
a primary coil coupled to said base; and
a power supply which supplies a time-varying electric current to said primary coil; and
(b) a plurality of battery operated devices each carrying at least one cell, wherein each of the battery operated devices includes a battery charging system for simultaneously charging the at least one cell when the plurality of battery operated devices is placed proximately to said base, said battery charging system comprising;
a secondary coil for receiving magnetic flux produced by said primary coil of said induction charger, said secondary coil having a plurality of turns and generating an output voltage responsive to said received magnetic flux; and
a control circuit for controlling a number of turns of said secondary coil to adjust the output voltage according to a desired voltage to be applied to said at least one cell. - View Dependent Claims (11, 12)
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13. A method for simultaneously charging a plurality of cells each coupled to a corresponding plurality of secondary coils, comprising the steps of:
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placing the plurality of secondary coils and corresponding plurality of cells proximately to a base of an induction charger;
receiving at the plurality of secondary coils a magnetic flux produced by the induction charger, each of said plurality of secondary coils having a plurality of turns that are used in charging the corresponding plurality of cells; and
controlling a number of turns for each of said plurality of secondary coils to generate a desired voltage to be applied to the corresponding cell of said secondary coil. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for simultaneously charging a plurality of cells each coupled to a corresponding plurality of secondary coils, comprising the steps of:
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placing the plurality of secondary coils and corresponding plurality of cells proximately to a base of an induction charger;
supplying a magnetic flux from said base for charging the plurality of cells;
receiving said magnetic flux at the plurality of secondary coils;
selectively controlling the number of turns of said plurality of secondary coils in response at least in part to a desired voltage to be applied to said plurality of cells; and
generating an output voltage at each of the plurality of secondary coils in response to said received magnetic flux and selectively controlled number of turns of each of said plurality of secondary coils. - View Dependent Claims (20, 21)
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Specification