Flame rectification sensor employing pulsed excitation

Details Flame rectification sensor employing pulsed excitation Flame rectification sensor employing pulsed excitation

F - Mech Eng,Light,Heat,Weapons

23

N

F23N 5/12 (2006.01)

Patent

CA 2135776

2135776 9428354 PCTABS00034 A flame rectification type flame sensor circuit and method in which a generator (51) injects periodic pulses of alternating voltage into a flame region (58), the voltage across the flame region (58) being processed by a filter/amplifier (60) which, in proper operation, produces a non-zero output signal only during the time a flame (58) is present and a pulse of alternating voltage is being supplied by the generator (51). Final indication of a flame (58) is produced only if a non-zero output signal occurs during the time a pulse of alternating voltage is being supplied, and not during the time between successive pulses of alternating voltage. Failure of an electrical component in the filter/amplifier (60) is indicated if a non-zero output signal occurs during the time between successive pulses of alternating voltage.

Circuit et procédé de détection de flamme du type redressement d'une flamme. Dans ledit circuit, un générateur (51) injecte des impulsions périodiques de tension alternative dans la région (58) d'une flamme, la tension à travers la région (58) de flamme étant traitée par un filtre/amplificateur (60) qui, lorsqu'il fonctionne correctement, produit un signal de sortie non-zéro uniquement pendant le temps de présence d'une flamme (58), et une impulsion de tension alternative est fournie par le générateur (51). L'indication finale de la présence d'une flamme (58) est produite uniquement si un signal de sortie non-zéro est produit pendant la prériode pendant laquelle une impulsion de tension alternative est fournie, et non pendant la période séparant des impulsions successives de tension alternative. La panne d'un composant électrique dans le filtre/amplificateur (60) est indiquée si un signal de sortie non-zéro est produit pendant la période séparant des impulsions successives de tension alternative.

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