Multiple load control apparatus having load equalization

Details Multiple load control apparatus having load equalization Multiple load control apparatus having load equalization

1982-09-30

1985-04-16

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219483, 219497, 219328, 219331, 307 39, 307 41, H05B 102

Patent

active

045117900

ABSTRACT:
A controller for a water heater having a plurality of individual electrical heating elements changes the number of energized elements to maintain a predetermined minimum temperature. The number of "on" elements is related to the difference between sensed water temperature and a preset water temperature divided by a dead band factor. The heating elements are turned "on" and "off" in a programmed sequence whenever a change is required to optimize the equalization of operating time of the elements. The controller includes a microprocessor which monitors turn "on" or "off" of each element to continuously develop the "on" operational period of each element in relationship to all of the other heating elements since system initialization. The operation period is made relative to the load with the shortest period by substracting the lowest "on" time from all other loads so as to reduce the required memory size. The microprocessor periodically updates the status by processing of the last read and stored signals to create appropriate control signals for turning elements on and off in accordance with the longest and shortest operation periods respectively and thereby equalize element loading.

REFERENCES:
patent: 4181950 (1980-01-01), Carter
patent: 4276603 (1981-06-01), Beck et al.
patent: 4321477 (1982-03-01), Bartlett
patent: 4333002 (1982-06-01), Kozak

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