Synchronized high voltage generator

摘要

In a video display operable at multiple horizontal scanning frequencies, a synchronized high voltage generator is substantially undisturbed during synchronizing source selection or interruption. The generator comprises a controlled oscillator generating a drive signal. A source of pulses synchronizes the controlled oscillator and has a plurality of scanning frequencies. A high voltage generator is coupled to the drive signal and generates a display energizing supply. The scanning frequencies occur in two frequency bands, and when synchronized the oscillator generates the drive signal having a frequency only in a higher frequency band of the two frequency bands. In a further inventive arrangement a high voltage generator for a video display is operable at a plurality of horizontal scanning frequencies and is controlled such that the high voltage supply remains substantially constant during an interruption of horizontal scanning pulses from the source.