Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1991-11-25
1994-10-25
Paschall, Mark H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219485, 219481, 219497, 219506, 307 38, 361 93, 361 87, H05B 102
Patent
active
053591780
ABSTRACT:
In an apparatus for detecting turn-on state of plural heaters including an electric power source for supplying electric power to the plural heaters, a controller controls the electric power source to be turned on and off so that each of the plural heaters is turned on and off in a predetermined manner, and a current sensor measures the total current supplied from the electric power source to the plural heaters. Then, a comparator compares the total current measured by the current sensor with plural reference values different from each other and outputting signals for representing comparison results thereof, and a judging circuit judges turn-on or off state of each of the plural heaters based on the signals outputted from the comparators.
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Kotani Akio
Yoshida Keiji
Minolta Camera Kabushiki Kaisha
Paschall Mark H.
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