Normally the CDI modules used in automotive have a very simple kill ignition system: a simple switch that sends the current from the load coil to earth, usually through a diode. This prevents the discharge capacitor from charging and therefore eliminates any possibility of fire spark. It is a simple, effective, reliable and ubiquitous system.
For me, it is surprising to see that Rotax-Ducati does not use this simple arrangement, but implements a very complex circuit with several semiconductors (a MOSFET, a thyristor and a bipolar transistor) as active elements. As E. Musk use to say, “best part is no part”.
Several threads of this forum tackle how change or improve Rotax CDI modules.
Someone has an idea of the reason for this complex circuit of dubious reliability.
Thanks in advance.
NOTE: This is my first intervention in this magnificent forum and I would like to introduce myself. My name is Juan Navarro and I recently obtained my pilot's license for ultralight aircraft in Spain. I recently bought a Skyranger with 912 ULS engine from 2005 in which I had to replace several parts. On this path I have had no choice but to search, read, learn and work on the plane. Many of the lessons I have learned in this forum.