Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1998-07-14
1999-08-17
Paschall, Mark
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219519, 219501, 219518, 99329R, H05B 102
Patent
active
059389605
ABSTRACT:
An RC oscillator having an oscillation frequency which is controllable by supplying a step voltage signal to a series arrangement of a capacitor and a resistor, the oscillation frequency being dependent on the time for the capacitor to be charged to a given voltage level. In order to vary the frequency, the amplitude of the supplied step voltage is varied instead of the resistance of the resistor via which the capacitor is charged. The amplitude variation can be provided, for example, by a potentiometer which acts as a voltage divider for the step voltage. The tolerance of the potentiometer in regard to its resistance value will not be relevant, because it is only the ratio between different portions thereof which is determinative. The step voltage, and consequently the oscillation frequency, will be proportional to the setting of the potentiometer regardless of the resistance tolerance thereof.
REFERENCES:
patent: 4170932 (1979-10-01), Lancette
patent: 4376243 (1983-03-01), Renn et al.
patent: 5402708 (1995-04-01), Krasznai et al.
patent: 5672288 (1997-09-01), Tran
Bij De Leij Tjerk
Lulofs Klaas J.
Bartlett Ernestine C.
Eason Leroy
Paschall Mark
U.S. Philips Corporation
LandOfFree
Timer with adjustable time control based on an RC oscillator wit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Timer with adjustable time control based on an RC oscillator wit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Timer with adjustable time control based on an RC oscillator wit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-312370