Controlling inductive power transfer systems

Details Controlling inductive power transfer systems Controlling inductive power transfer systems

2010-09-18

2011-10-11

Diao, M'Baye (Department: 2858)

Electricity: battery or capacitor charging or discharging

Cell or battery charger structure

Charger inductively coupled to cell or battery

C307S104000, C307S017000

Reexamination Certificate

active

08035340

ABSTRACT:
An inductive power transfer system comprises a primary unit, having a primary coil and an electrical drive unit which applies electrical drive signals to the primary coil so as to generate an electromagnetic field. The system also comprises at least one secondary device, separable from the primary unit and having a secondary coil which couples with the field when the secondary device is in proximity to the primary unit. A control unit causes 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 unit takes 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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Response to European Office Action in counterpart European patent application dated Nov. 14, 2007.

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