Oscillators – Frequency stabilization – Temperature or current responsive means in circuit
Patent
1985-02-13
1986-06-03
LaRoche, Eugene R.
Oscillators
Frequency stabilization
Temperature or current responsive means in circuit
331 66, 310315, 219210, H03L 104
Patent
active
045932581
ABSTRACT:
An apparatus for controlling the temperature of a device whose temperature is to be stabilized within a preset range is disclosed. The apparatus is particularly applicable to stabilizing the temperature, and thus frequency of operation of, a crystal controlled oscillator, without expending additional energy in specialized crystal heating apparatus. The apparatus preferably includes first and second power supply regulators coupled to a source of unregulated voltage. The second power supply regulator preferably has a higher output voltage than the first power supply regulator and the outputs of the two regulators are coupled together. The cyrstal is attached to the second regulator so that heat generated by the second regulator is dissipated in the crystal. A temperature sensing device is coupled to the crystal and generates a signal proportional to the temperature of the crystal. The signal from the temperature sensing device is fed to a comparator which compares the signal from the temperature sensing device with a reference voltage. The output of the comparator is then coupled back to a control input of the second regulator so as to turn the second regulator off and first regulator on when the temperature of the crystal exceeds a preset value. When the crystal temperature decreases, the second regulator is turned on, and the first regulator off. Accordingly, heat from a power supply regulator, which would otherwise be dissipated in a heat sink, is used to maintain the temperature of the crystal within a preset range.
REFERENCES:
patent: 3413438 (1968-11-01), Gardner et al.
patent: 4297657 (1981-10-01), Frerking
LaRoche Eugene R.
Pascal Robert J.
LandOfFree
Energy conserving apparatus for regulating temperature of monito does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Energy conserving apparatus for regulating temperature of monito, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Energy conserving apparatus for regulating temperature of monito will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1234844