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Electronic ignition system circuit

2017-08-16 07:23  
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An ignition system is a system for igniting a fuel-air mixture. Ignition systems are well known in the field ofinternal combustion enginessuch as those used inpetrol (gasoline) enginesused to power the majority ofmotor vehicles, but they are also used in many other applications such as in oil-fired and gas-firedboilers,rocket engines, etc.This electronic ignition circuit is intended to be inserted into a car`s conventional ignition system. In effect, it replaces the original 12-V switching circuit in the primary winding of the coil by one generating more than 100 V. It thereby converts a current circuit, which is upset by lead and stray resistance, into a voltage circuit that is much more efficient. The pulses emanating from the contact breaker, shown at the extreme lower left-hand side of the diagram, are applied to transistor T1 and subsequently differentiated by R3/C1. This causes a negligible ignition delay. The two series-connected 180-V zener diodes protect the collector of the BU932R against too high of a voltage. The Darlington must be fitted on a suitable heatsink.The 79076, in conjunction with an appropriate Freescale Power Darlington Transistor, provides an economical solution for automotive ignition applications. The 79076 offers optimum performance by providing closed loop operation of the Power Darlington in controlling the ignition coil current.

Electronic Ignition