Oscillators – Frequency stabilization – Temperature or current responsive means in circuit
Patent
1982-06-30
1985-04-02
LaRoche, Eugene R.
Oscillators
Frequency stabilization
Temperature or current responsive means in circuit
331 66, 331167, H03L 102
Patent
active
045090238
ABSTRACT:
A method of using the temperature coefficient of the copper resistance of an oscillating coil to compensate for the temperature coefficient of the quality factor of the same oscillating coil. To this end, a voltage proportional to the copper resistance of the oscillating coil is generated across the oscillating circuit. The oscillator according to the process comprises an oscillating coil which comprises a high frequency litz wire. In order to access the copper resistance of the coil one of the litz wires is separated from the other wire at a first terminal of the coil and separately connected to a second terminal of this coil. From this second terminal, the coil is seen as a bifilar coil. A constant alternating current source is connected to the second terminal in order to generates across the oscillating circuit a voltage proportional to the copper resistance of the coil. The oscillator is preferably used for proximity switches having relatively large switching distance.
REFERENCES:
patent: 3296553 (1967-01-01), Reid
patent: 4241317 (1980-12-01), Breitling
Elektronik, Band 19, Nr. 3, Mar. 1970.
Electronic Technology, Band 39, Nr. 9, Sep. 1962.
Contrinex S.A.
LaRoche Eugene R.
Pascal Robert J.
Siemens Aktiengesellschaft
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