System, method and apparatus for contact-less battery charging with dynamic control
First Claim
1. A method of contact-less charging of a portable device'"'"'s battery from an external host, comprising:
- generating power in the host via a power converter;
electrically coupling the host to the portable device in a contact-less manner; and
dynamically controlling power generation in the host from the portable device, where the controlling of power generation is accomplished via charging controller in the portable device, and where switches of the power converter are capacitively coupled to the charging controller.
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Abstract
A system, method and apparatus for contact-less charging of battery operated devices, including a host charger with a power converter and resonant tank circuit and a portable device where the battery is located, with a battery charging control IC, wherein the method obviates the need for a voltage controller in each of both the host and the portable stages. The charging of the battery in the portable device is controlled by a charging controller therein, which is in continual electric communication with the host, whose output power the control IC dynamically monitors and controls. In one embodiment, component count is minimized but battery charging is not optimized when the battery voltage is very low. In the other embodiment, charging efficiency is maximized regardless of the output voltage of the battery.
448 Citations
19 Claims
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1. A method of contact-less charging of a portable device'"'"'s battery from an external host, comprising:
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generating power in the host via a power converter;
electrically coupling the host to the portable device in a contact-less manner; and
dynamically controlling power generation in the host from the portable device, where the controlling of power generation is accomplished via charging controller in the portable device, and where switches of the power converter are capacitively coupled to the charging controller. - View Dependent Claims (2, 3, 4, 5)
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6. A method of contact-less battery charging, comprising:
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driving a discrete resonant tank circuit with a power converter; and
transferring energy from the discrete resonant tank circuit to a battery charging circuit connected to a battery via a transformer, where during charging;
the discrete resonant circuit and the battery charging circuit are brought into proximity but need not be physically connected, and where the power converter is continually in electronic communication with, and under the dynamic control of, a charging controller located in a portable device. - View Dependent Claims (7, 8)
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9. Apparatus for a contact-less battery charger, comprising:
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a discrete resonant tank circuit;
a power converter;
a spiral wound conductor; and
two conducting plates;
where in operation the power converter is controlled by a voltage appearing across the two conducting plates. - View Dependent Claims (10, 11, 12, 13)
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14. System for contact-less charging of battery operated portable devices, comprising:
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a charger, comprising;
a resonant tank circuit;
a power converter;
a first spiral wound conductor; and
a first set of two conducting plates, where the power converter is controlled by a voltage appearing across the two conducting plates; and
a portable battery-operated device, comprising;
a second spiral wound conductor;
a battery charging controller;
a full bridge rectifier; and
a second set of two conducting plates;
where, when the charger and the portable device are brought into proximity the first and second spiral wound conductors form a transformer, and the first and second set of conducting plates form two capacitors. - View Dependent Claims (15, 16, 17, 18)
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19. Apparatus for a contact-less battery charger, comprising:
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a resonant tank circuit;
a half-bridge power converter having switches;
a resistor a spiral wound conductor;
two conducting plates, where in operation, the power converter is controlled by a voltage appearing across the two conducting plates, wherein the voltage is a logic signal;
wherein a resistance is connected across the two conducting plates, such that the logic signal is converted to a positive pulse for the duration of a rising transition and a negative pulse for the duration of a falling transition; and
wherein a resistor is connected is series with one of the half-bridge power converter switches.
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Specification