Efficient inductive battery recharging system
First Claim
1. A method of inductively charging a rechargeable battery of a portable device in a vehicle via a primary circuit that includes a primary inductive coil, a secondary circuit that includes a secondary inductive coil, and a rectifying circuit electrically coupled to said rechargeable battery, said method comprising the steps of:
- energizing said primary inductive coil with a supply voltage;
varying a frequency of said supply voltage;
detecting a peak voltage of said primary inductive coil; and
adjusting said frequency of said supply voltage to a respective frequency associated with said peak voltage.
12 Assignments
0 Petitions
Accused Products
Abstract
A method is provided for inductively charging a rechargeable battery of a portable device in a vehicle via a primary circuit that includes a primary inductive coil, a secondary circuit that includes a secondary inductive coil, and a rectifying circuit electrically coupled to the rechargeable battery. A primary coil is energized with a supply voltage. A frequency of the supply voltage is varied. A peak voltage of the primary circuit is detected. The frequency of the supply voltage is adjusted to a respective frequency associated with the peak voltage.
122 Citations
12 Claims
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1. A method of inductively charging a rechargeable battery of a portable device in a vehicle via a primary circuit that includes a primary inductive coil, a secondary circuit that includes a secondary inductive coil, and a rectifying circuit electrically coupled to said rechargeable battery, said method comprising the steps of:
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energizing said primary inductive coil with a supply voltage;
varying a frequency of said supply voltage;
detecting a peak voltage of said primary inductive coil; and
adjusting said frequency of said supply voltage to a respective frequency associated with said peak voltage. - View Dependent Claims (2, 3, 4)
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5. A method of inductively charging a cellular telephone rechargeable battery in a vehicle via a primary circuit that includes a primary inductive coil, a secondary circuit that includes a secondary inductive coil, and a rectifying circuit electrically coupled to said rechargeable battery, said method comprising the steps of:
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energizing said primary inductive coil with a supply voltage;
varying a frequency of said supply voltage;
monitoring a voltage across said primary inductive coil;
determining a peak voltage as said frequency of said supply voltage is varied across said primary inductive coil; and
adjusting said frequency of said supply voltage to a respective frequency associated with said peak voltage. - View Dependent Claims (6, 7)
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8. A charging system for inductively charging a rechargeable battery of a portable device in a vehicle, said charging system including a vehicle-based recharging unit that maximizes a supply voltage inductively supplied to said rechargeable battery, the system comprising:
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a primary circuit including a primary inductive coil;
a secondary circuit including a secondary inductive coil, said primary inductive coil inducing a voltage in said secondary inductive coil; and
a control device for monitoring said voltage of said primary inductive coil and for determining a frequency adjustment for automatically adjusting said frequency of said supply voltage;
wherein said control device varies said frequency for maximizing said voltage across said primary coil, and wherein said control device adjusts said frequency to a respective frequency associated with said maximized voltage. - View Dependent Claims (9, 10, 11, 12)
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Specification