Temperature controller for a fusing roller

Electric heating – Heating devices – With power supply and voltage or current regulation or...

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219492, 219216, 323236, 307252UA, A05B 102

Patent

active

044006136

ABSTRACT:
Apparatus for controlling the cycles of AC power supplied to a variable thermal load in response to analog signals representing the temperature of the load comprising means for quantizing the analog signals into digital signals and controlling the proportion of integral cycles of AC current blocked to those supplied to said load, while providing a uniform spacing in time of the integral cycles supplied, in accordance with said digital signals. Also means are provided for modifying said digital signals in response to a predetermined average current overload.

REFERENCES:
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patent: 3806784 (1974-04-01), Findlay
patent: 3813516 (1974-05-01), Kudsi et al.
patent: 3878358 (1975-04-01), Barton et al.
patent: 3946199 (1976-03-01), Nakamura
patent: 4029937 (1977-06-01), Russell
patent: 4046991 (1977-09-01), Sefton et al.
patent: 4093847 (1978-06-01), Walker et al.
patent: 4097723 (1978-06-01), Leitner et al.
patent: 4104715 (1978-08-01), Lawson, Jr.
Zero Voltage Switching for Proportional Temperature Control by Brookmire, EEE Circuit Design Engineering, pp. 96-98, 4-1967.

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