Controller to control electrical power of load in constant
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United States of America Patent
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Feb 19, 2013
Grant Date -
Oct 20, 2011
app pub date -
Apr 13, 2011
filing date -
Apr 20, 2010
priority date (Note) -
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Abstract
A heater controller for controlling a heater precisely in the equi-power mode is disclosed. The controller includes a current source, a voltage monitor to detect a voltage drop caused in the heater, and a controller. The voltage drop may be converted to the digital form as refereeing to the first reference, while, the heater current is converted from the digital form as referring to the second reference. The second reference shows substantial temperature dependence, while, the first reference has lesser temperature dependence. The control corrects the temperature dependence of the second reference as referring to the first reference.
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