Redundant Ignition Control Circuit and Method
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United States of America Patent
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N/A
Issued Date -
Mar 25, 2010
app pub date -
Sep 22, 2008
filing date -
Sep 22, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A redundant ignition control system and method for gas burning appliances is provided. The system utilizes a main processor and a supervisory processor to provide the redundant, fail safe operation of both the pilot valve and the main gas valve of the appliance. Three switching elements under the control of the two processors, as well as the use of high pass filters to block DC from the gas control valves provide redundant, fail safe operation. The use of variable duty cycle or frequency pulse width modulated signals enables use in low power applications and ensures system safety. Inclusion of a gas valve verification sequence, ignition sequence, burner monitoring sequence, and heat shutdown and standby sequences ensures safe, low power operation during normal control, and fail safe operation upon the failure of any component of the system.
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