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Photodetector Flame ignitor circuit

2017-08-16 16:04  
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An flame ignitor was an earlyignition device used in internal-combustion engines that used a flame outside the engine and a sliding port on the cylinder head. At the appropriate time in the compression cycle of the engine, the port would briefly be opened and closed allowing the fuel/air mixture in the cylinder to be ignited by the flame.The spark developed by the circuit is suitable for a gas ignitor. Capacitor Cl is charged through Rl and Dl toward peak line voltage. C2 is simultaneously being charged at a slower rate through R5. When the charge on C2 is sufficient.to trigger thePUT , the SCR is triggered on, providing a rapid discharge path for Cl through the transformer primary. TheSCR is triggered about 20 times per second with the component values shown.The Ll4G3 serves as a flame sensor. When ignition is achieved and sensed by the photodetector, the low Vc8 prevents further SCR triggering.Photosensors or photodetectors are sensors of light or other electromagnetic energy. Light detector is a current-to-voltage converter. The FET input op-amp prevents the loading of the photodiode and the voltage at the output is proportional to the current in the photodiode. So long as the photodiode response to the light is linear, the output voltage is proportional to the light falling on the photodiode.




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