Title:
【発明の名称】共振回路の温度補償方法
Document Type and Number:
Japanese Patent JPH0614604
Kind Code:
B2
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.
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Inventors:
PEETAA HEIMURIHERU
Application Number:
JP12431282A
Publication Date:
February 23, 1994
Filing Date:
July 16, 1982
Export Citation:
Assignee:
KONTORINETSUKUSU SA
International Classes:
H03B5/08; H03B5/04; H03H5/10; H03K17/14; H03K17/95; H03L1/02; (IPC1-7): H03B5/08
Attorney, Agent or Firm:
Akira Asamura (2 outside)
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