Inductance alteration detection system for determining inductance alteration in coils

摘要

The inductance alteration detection system (1) has an inductance alteration converter (2), which converts the alteration in the coils (L1, L2) in to a voltage. A reference voltage generator (3) generates a preset reference voltage (VR). A frequency characteristic adding unit (5) is provided with its output signal also converted to a voltage. A reference voltage compensation unit (4) is provided, which varies and compensates the frequency spectrum of the reference voltage, inclusive of the added frequency characteristic parallel in the amplitude direction, corresp. to a variation in the frequency spectrum of the converted voltage. Also an inductance alteration detector unit (9), which compares the converted voltage with the compensated reference voltage, for determining the inductance alteration with the coils.