Electricity: battery or capacitor charging or discharging – Cell or battery charger structure – Charger inductively coupled to cell or battery
Reexamination Certificate
2011-01-11
2011-01-11
Tso, Edward (Department: 2858)
Electricity: battery or capacitor charging or discharging
Cell or battery charger structure
Charger inductively coupled to cell or battery
C307S104000
Reexamination Certificate
active
07868587
ABSTRACT:
An inductive power transfer system comprises a primary unit10, having a primary coil12and an electrical drive unit14which applies electrical drive signals to the primary coil so as to generate an electromagnetic field. The system also comprises at least one secondary device30, separable from the primary unit and having a secondary coil32which couples with the field when the secondary device is in proximity to the primary unit. A control unit16causes a circuit including said primary coil to operate, during a measurement period, in an undriven resonating condition. In this condition the application of the drive signals to the primary coil by the electrical drive unit is suspended so that energy stored in the circuit decays over the course of the period. A decay measurement unit18takes one or more measures of such energy decay during the measurement period. In dependence upon said one or more energy decay measures, the control unit controls the electrical drive unit so as to restrict or stop inductive power transfer from the primary unit.
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Dunton John Robert
Knill Alexander Charles
Stevens Michael Craig
Access Business Group International LLC
Diao M'Baye
Tso Edward
Warner & Norcross & Judd LLP
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