Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1978-12-11
1981-04-07
Grimley, Arthur T.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219509, 219218, 219522, 219203, 307117, H05B 100, H05B 102
Patent
active
042608767
ABSTRACT:
A control circuit for proportionally controlling the application of available ac current to thin film heaters and other heating apparatus for transparent windows and other selected surfaces of refrigerated cabinets prevents condensation of moisture thereon. A transducing sensor in contact with the ambient air and thermally coupled to the refrigerated cabinet surfaces provides control signals to an ac heating current control circuit in relation to the difference between cabinet surface temperature and the dew point temperature of the ambient air. As the cabinet surface temperature drops closer to dew point the application of electric power to the transparent window and other surface heating apparatus is proportionally increased by the control circuit by applying heater current during correspondingly increased "on" periods for passage of the available ac heater current. "On" periods of the heater current are initiated during times in a cycle when the ac is at or near its null. At the two extremes of the operating range of the control circuit, heater current may be applied full "on" and full "off" respectively.
REFERENCES:
patent: 3519917 (1970-07-01), Martin
patent: 3702921 (1972-11-01), Thelen
patent: 3821516 (1974-06-01), Hayes et al.
patent: 3902040 (1975-08-01), Ikeda et al.
patent: 3909675 (1975-09-01), Hirsbrunner et al.
patent: 3924102 (1975-12-01), Hanekom
patent: 4029937 (1977-06-01), Russell
patent: 4127765 (1978-11-01), Heaney
Anthony's Manufacturing Company, Inc.
Grimley Arthur T.
Paschall Mark H.
LandOfFree
Dew point differential power controller does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dew point differential power controller, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dew point differential power controller will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-290853