METHOD AND APPARATUS FOR SUPPLYING POWER TO A RADIANT HEATING ELEMENT
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United States of America Patent
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Issued Date -
Jan 14, 2016
app pub date -
Jul 11, 2014
filing date -
Jul 11, 2014
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Abstract
In order to supply power to a radiant heating element, which is connected at a first connection, via a triac, to a first terminal of a supply voltage source and at a second connection, with a relay, to a second terminal of the supply voltage source, wherein an interference suppression capacitor is connected in parallel with the series circuit by the triac and the radiant heating element and a feedback circuit is connected between the triac and the radiant heating element, after disconnection of the radiant heating element from the second terminal, the interference suppression capacitor is now only connected to the second terminal via the feedback circuit. Depending on the time of the disconnection from the second terminal and the polarity of the supply voltage present at that time, the interference suppression capacitor is discharged via the feedback circuit, which results in discharge pulses at the feedback circuit which are taken as a signal that the radiant heating element is disconnected from the supply voltage source.
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