Summary of US Patent 3938018 – Inductive Charging – One device.
Primary oscillator @ 10-40kHz. Secondary orientation is fixed, for use with one specific device.
Summary of US Patent 691718 – Increased Efficiency Inductive Charging.
Control module monitors secondary voltage and switches-in a plurality of coils to increase/decrease charging voltage. Theory is that different devices may require different charging voltages which will be controlled by this module located in the secondary circuitry.
Summary of US Patent 5959433 – Inductively Charged Battery Pack.
Not much info about design of coils. Good discussion of battery charging circuit.
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