Capacitor discharge ignition (CDI) systems operate on the principle of efficiently charging and discharging a capacitor. This system is designed to provide a rapid burst of energy to the ignition coil, causing the spark plug to spark and start the engine. Let's dive into each step to better understand how this happens in real-time.
Components rated to operate up to 100°C. Twenty or so years ago, Capacitor Discharge Ignition (CDI) was the acknowledged solution for automotive enthusiasts wanting a high energy ignition circuit. CDI gave a really hot spark which would fire virtually any spark plug no matter how fouled or grotty it was.
Capacitor discharge ignition systems (CDI) are mainly divided into two types: alternating current CDI (AC-CDI) and direct current CDI (DC-CDI). Each type has its specific working principles, suitable environments, and user experience. Below, we explore these differences more practically.
Capacitive discharge ignition systems, often called CDI and sometimes called thyristor ignition systems, are a high-efficiency electronic ignition technology. It is widely used in the automotive industry. You'll find CDI systems in a variety of small internal combustion engines, such as motorcycles, outboard engines, chainsaws, and lawnmowers.
An ignition coil transforms low voltage, often from a battery, into the thousands of volts needed to create an electrical spark in the spark plugs for igniting the engine's fuel mixture. On the other hand, capacitors in CDI systems are used to store and swiftly release electrical charge at the right moment for ignition.
The main function of the charging circuit in the CDI module is to charge the main capacitor quickly and reliably. The capacitor is capable of charging from 250V to 600V in a short time. This rapid boost is achieved through a high-efficiency boost converter using advanced semiconductor technology such as MOSFETs.
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Capacitor discharge ignition (CDI) or thyristor ignition is a type of automotive electronic ignition system which is widely used in outboard motors, motorcycles, lawn mowers, chainsaws, small …