Ballast Controller Single Capacitor Preheat Timing

The patent uses a capacitor to store timing information before power failure, and after power restoration, the controller reads this stored timing to determine whether the filament has cooled sufficiently before initiating preheating again. This preliminary action of storing and retrieving timing data prevents repreheating by ensuring the filament has had adequate time to cool down.

The patent implements a feedback mechanism where the controller continuously monitors the timing of power failures and preheating operations. By using the capacitor to maintain timing information and the controller to process this information, the system adjusts its preheating behavior based on the actual state of the filament, preventing over-preheating while ensuring proper preheating when needed.

The patent makes a single capacitor serve multiple functions: it stores timing information for preheating control, maintains ignition timing data, and provides power to the controller during critical operations. By designing the capacitor to handle multiple timing and control functions simultaneously, the patent eliminates the need for separate capacitors for each function, thereby reducing circuit complexity while maintaining precise timing control.

The patent combines the timing control functions for both preheating and ignition into a single capacitor and controller system. Instead of having separate capacitors for preheating timing and ignition timing, the invention merges these functions into one integrated system where the single capacitor manages all timing-critical operations, simplifying the overall circuit design.