High voltage stabilization circuit for video display apparatus

摘要

A deflection circuit output stage generates in a deflection flyback resonant circuit a first flyback voltage at a horizontal frequency. A switch generates in a second flyback resonant circuit a second flyback voltage at the horizontal frequency having a phase relative to that of the first flyback voltage that is controllable. The first and second flyback voltages are summed and applied to a voltage tripler that produces an ultor voltage. A control circuit varies the phase of the second flyback voltage in a negative feedback manner that stabilizes the ultor voltage over a wide range of beam current variations.