METHOD AND APPARATUS FOR SUPPLYING POWER TO A RADIANT HEATING ELEMENT

摘要

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.

主权项

1. A method for supplying power to a radiant heating element,
wherein said radiant heating element has a first connection being connected to a first terminal of a supply voltage source and has a second connection being connected to a second terminal of said supply voltage source, wherein said first connection to said first terminal is made via an electronic switching means, said radiant heating element and said electronic switching means forming together a series circuit, wherein an interference suppression capacitor is connected in parallel with said series circuit, wherein a feedback circuit is connected between said electronic switching means and said radiant heating element and is connected to said second terminal or to ground, wherein said radiant heating element and said interference suppression capacitor are connected to said second terminal of said supply voltage source or to said ground and are disconnected therefrom by means of a relay, wherein after disconnection of said radiant heating element and said interference suppression capacitor from said second terminal, said interference suppression capacitor is now only connected to said second terminal via said feedback circuit and, depending on the time of disconnection from said second terminal and said polarity of said supply voltage of said supply voltage source present at that time, said interference suppression capacitor is discharged via said feedback circuit, and wherein said discharging results in discharge pulses at said feedback circuit, and wherein said discharge pulses are taken as a signal that said radiant heating element and said interference suppression capacitor are disconnected from said supply voltage source.