System, method and apparatus for contact-less battery...

Details System, method and apparatus for contact-less battery... System, method and apparatus for contact-less battery...

2005-01-18

2005-01-18

Riley, Shawn (Department: 2838)

Electricity: battery or capacitor charging or discharging

Cell or battery charger structure

Charger inductively coupled to cell or battery

Reexamination Certificate

active

06844702

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.

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S.C. Tang, “A Low-Profile Low-Power Converter with Coreless PCB Isolation Transformer”, vol. 16, No. 3, Mar. 3, 2001, pp. 311-315, IEEE Transactions on Power Electronics.

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