Preheat Ballast Schematic

Posted on Feb 5, 2014

It incorporates a Starter for each lamp, which heats up the fillaments [Cathodes] at each end of the lamp prior to starting. Once the lamp has started, it no longer requires heated fillaments. The heating is only a starting aid. During normal operation, the starter`s contacts will be open, and the only circuit path through it will be the Capacitor inside the Starter`s case. The currents will now flow easily through

Preheat Ballast Schematic
Click here to download the full size of the above Circuit.

the lamp [much lower Impedance across the lamp than the starter], only a minimal amount of current flows through the starter`s Capacitor. Once the arc is extinguished, the lamp becomes a higher Impedance than the starter, so currents will now flow easier through the fillaments and the Starter, minimal current flows through the lamp.

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