Inductance-change detection apparatus
First Claim
1. An inductance-change detection apparatus for detecting inductance changes in coils comprising:
- an inductance-change converter that converts inductance changes in coils into voltages to output;
a reference-voltage generator that generates and outputs a predetermined reference voltage;
a frequency characteristic adder that adds a frequency characteristic similar to that of the converted voltage converted by said inductance-change converter to the reference voltage output from said reference-voltage generator;
a reference-voltage compensator that varies and compensates the frequency spectrum of the reference voltage containing the added frequency characteristic, in parallel in the direction of amplitude, corresponding to a parallel variation of the frequency spectrum of the converted voltage converted by said inductance-change converter in the direction of amplitude; and
an inductance-change detector that compares the converted voltage converted by said inductance-change converter with the reference voltage compensated by said reference-voltage compensator to detect inductance changes in said coils.
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Accused Products
Abstract
The inductance-change detection apparatus comprises an inductance-change converter that converts inductance-change in coils into voltage to output, a reference-voltage generator that generates and outputs a predetermined reference voltage, a frequency characteristic adder that adds a frequency characteristic similar to that of the converted voltage converted by the inductance-change converter to the reference voltage, a reference-voltage compensator that varies and compensates the frequency spectrum of the reference voltage containing the added frequency characteristic, in parallel in the direction of amplitude, corresponding to a parallel variation of the frequency spectrum of the converted voltage in the direction of amplitude, and an inductance-change detector that compares the converted voltage with the compensated reference voltage to detect inductance changes in the coils.
2 Citations
5 Claims
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1. An inductance-change detection apparatus for detecting inductance changes in coils comprising:
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an inductance-change converter that converts inductance changes in coils into voltages to output;
a reference-voltage generator that generates and outputs a predetermined reference voltage;
a frequency characteristic adder that adds a frequency characteristic similar to that of the converted voltage converted by said inductance-change converter to the reference voltage output from said reference-voltage generator;
a reference-voltage compensator that varies and compensates the frequency spectrum of the reference voltage containing the added frequency characteristic, in parallel in the direction of amplitude, corresponding to a parallel variation of the frequency spectrum of the converted voltage converted by said inductance-change converter in the direction of amplitude; andan inductance-change detector that compares the converted voltage converted by said inductance-change converter with the reference voltage compensated by said reference-voltage compensator to detect inductance changes in said coils. - View Dependent Claims (2, 3, 4, 5)
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Specification