Power controller for heater load

Details Power controller for heater load Power controller for heater load

D - Textiles, Paper

21

F

341/7, 309/86

D21F 5/16 (2006.01) D21F 5/00 (2006.01) F26B 3/30 (2006.01) G05D 22/02 (2006.01) H02J 3/14 (2006.01) H05B 3/00 (2006.01)

Patent

CA 2013035

A power control system for the heat lamps for typically drying a continuous web of paper in order to provide a linear moisture profile locates the actuating thyristor type switch at each zone where the heater lamps themselves are located. Thus, computer control can be centralized and wiring minimized. The parameters of minimum flicker for unity power factor and high resolution power control are achieved by utilizing the timing signals provided by the zero crossings of the three-phase AC line voltage input and controlling either half cycles or partial half cycles for each zone. Computing time is reduced by providing for scratch pad memory tables which can rapidly be scanned or sequenced through by a zone pointer.

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