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Automotive glossary: What is a Capacitor Discharge Ignition or Thyristor Ignition? (Abbr.: CDI)

Definition of Capacitor Discharge Ignition: Engendering the ignition spark is with this one done by the battery. The battery voltage is hereby transformed to beyond 300 volts and a capacitor is being charged by it. Via a semiconductor switch, the so called "thyristor", the capacitor is then being discharged suddenly into the ignition coil, and thus produces the required high voltage impact on the other side of the ignition coil.

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