Apparatus and method for sensing a current within a coil

Titelangaben

Lorentz, Vincent ; Berberich, Sven ; März, Martin:
Apparatus and method for sensing a current within a coil.
DE102008044634 (2008)

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Abstract

A method of sensing a current within a coil, said current being applied to the coil such that it is switched via a switching transistor, includes a detection transistor, a circuit and a control element. The detection transistor is configured to sense the current. The circuit is configured to provide, at a predetermined point in time during a current sensing period, a voltage across the switching transistor. The control element is configured to match, in response to the voltage provided by the circuit, the working points of the switching transistor and of the detection transistor, and to output an output signal which corresponds to the current to be sensed.