Wireless battery charger
First Claim
1. A wireless battery charging system, comprising:
- an inductive receiving member for coupling to an inductively generated AC signal;
a matching circuit having a variable impedance for presenting a desired impedance to the inductive receiving member and having variable matching parameters, the matching circuit interfacing an AC signal output by the inductive receiving member to a first AC signal output;
a rectifier circuit for converting the first AC signal output to a first DC voltage and having variable rectifier parameters to vary a first voltage drop thereacross;
a DC-to-DC voltage converter for converting an output of the rectifier circuit to a regulated voltage lower than the first DC voltage, an output of the DC-to-DC voltage converter charging the battery;
a current sensor for sensing series current through the matching circuit, rectifier circuit and DC-to-DC voltage converter;
a memory for storing a plurality of discrete predetermined power distribution configurations, each of the power distribution configurations associated with a separate power distribution scheme and each based on sensed voltages on an input of the matching circuit, an input of the rectifier circuit and an input of the DC-to-DC voltage converter in addition to the current sensed by the current sensor as determinative factors for power distribution; and
a controller sensing a second voltage drop across each of the matching circuit, rectifier circuit and DC-to-DC voltage converter and the current through the current sensor and determining power dissipation in each of the matching circuit, rectifier circuit and DC-to-DC voltage converter; and
the controller adjusting the variable matching parameters in the matching circuit, the variable rectifier parameters in the rectifier circuit and a voltage input to the DC-to-DC voltage converter in accordance with a predetermined power distribution configuration to distribute power thereacross in accordance with an associated power distribution scheme.
1 Assignment
0 Petitions
Accused Products
Abstract
A wireless battery charging system includes an inductive receiving member for receiving an AC signal for output to a matching circuit having a variable impedance with variable matching parameters. The output of the matching circuit drives a rectifier circuit for converting the inputted AC signal to a first DC voltage and having variable rectifier parameters to vary the voltage drop thereacross. A DC-to-DC converter for converting the first DC voltage to a regulated voltage for charging the battery. A current sensor senses current through the inductive receiving member, rectifier circuit and DC-to-DC converter. A controller senses the voltage drop across each of the matching circuit, rectifier circuit and DC-to-DC converter and the current there through to determine power dissipation in each of the matching circuit, rectifier circuit and DC-to-DC converter. The power distribution in each of the matching circuit, the rectifier circuit and the DC-to-DC converter can then be varied.
20 Citations
19 Claims
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1. A wireless battery charging system, comprising:
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an inductive receiving member for coupling to an inductively generated AC signal; a matching circuit having a variable impedance for presenting a desired impedance to the inductive receiving member and having variable matching parameters, the matching circuit interfacing an AC signal output by the inductive receiving member to a first AC signal output; a rectifier circuit for converting the first AC signal output to a first DC voltage and having variable rectifier parameters to vary a first voltage drop thereacross; a DC-to-DC voltage converter for converting an output of the rectifier circuit to a regulated voltage lower than the first DC voltage, an output of the DC-to-DC voltage converter charging the battery; a current sensor for sensing series current through the matching circuit, rectifier circuit and DC-to-DC voltage converter; a memory for storing a plurality of discrete predetermined power distribution configurations, each of the power distribution configurations associated with a separate power distribution scheme and each based on sensed voltages on an input of the matching circuit, an input of the rectifier circuit and an input of the DC-to-DC voltage converter in addition to the current sensed by the current sensor as determinative factors for power distribution; and a controller sensing a second voltage drop across each of the matching circuit, rectifier circuit and DC-to-DC voltage converter and the current through the current sensor and determining power dissipation in each of the matching circuit, rectifier circuit and DC-to-DC voltage converter; and the controller adjusting the variable matching parameters in the matching circuit, the variable rectifier parameters in the rectifier circuit and a voltage input to the DC-to-DC voltage converter in accordance with a predetermined power distribution configuration to distribute power thereacross in accordance with an associated power distribution scheme. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless power delivery system, comprising:
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an inductive receiving member for inductively coupling to an external inductive power transmission system; a variable impedance matching network for presenting a desired impedance to the inductive receiving member and having variable matching parameters to output a first AC signal output with a variable power dissipation; a rectification circuit for rectifying the first AC signal output to a first DC voltage and having variable rectifier parameters to vary the power dissipated thereby; a DC-to-DC voltage converter for converting the output of the rectification circuit to a regulated voltage, the output of the DC-to-DC voltage converter for powering an external load; a current sensor for sensing series current through the inductive receiving member, rectification circuit and DC-to-DC voltage converter; and a controller sensing a voltage drop across each of the variable impedance matching network, rectification circuit and DC-to-DC voltage converter and the current through the current sensor and determining power dissipation in each of the variable impedance matching network, rectification circuit and DC-to-DC voltage converter; the controller storing in an associated memory a plurality of stored power configurations, each of the stored power configurations defining an associated power distribution scheme for configuration of each of the variable impedance matching network, rectification circuit and DC-to-DC voltage converter, wherein the sensed voltage drop across each of the variable impedance matching network, rectification circuit in the DC-to-DC voltage converter are determinative factors in each of the power distribution schemes; and the controller selecting one of the power distribution schemes and the associated stored power configuration and adjusting the variable matching parameters in the variable impedance matching network, the variable rectifier parameters in the rectification circuit and a voltage input to the DC-to-DC voltage converter in accordance with the selected stored power configuration to distribute power thereacross in accordance with the associated power distribution scheme. - View Dependent Claims (11, 12, 13, 14)
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15. A wireless power delivery system, comprising:
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a coil for inductively coupling to an external inductive power transmission system; a variable impedance matching network for presenting a desired impedance to the coil and having variable matching parameters to output a first AC signal output with a variable power dissipation; a rectification circuit for rectifying the first AC signal output to a first DC voltage and having variable rectifier parameters to vary the power dissipated thereby; a DC-to-DC voltage converter for converting the output of the rectification circuit to a regulated voltage, the output of the DC-to-DC voltage converter for powering an external load; a sensor for sensing parameters of the coil, impedance matching network rectification circuit and DC-to-DC voltage converter that are associated with heat dissipation therein; and a controller determining power dissipation in each of the coil, impedance matching network, rectification circuit and DC-to-DC voltage converter; the controller storing a plurality of predetermined power configurations, each of the predetermined power configurations defining an associated power distribution scheme for configuration of each of the variable impedance matching network, rectification circuit and DC-to-DC voltage converter; and the controller selecting one of the power distribution schemes and the associated predetermined power configuration and adjusting the variable matching parameters in the variable impedance matching network, the variable rectifier parameters in the rectification circuit and the voltage input to the DC-to-DC voltage converter in accordance with the selected predetermined power distribution configuration to distribute power thereacross in accordance with the associated power distribution scheme. - View Dependent Claims (16, 17, 18, 19)
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Specification