Horizontal deflection phasing arrangement

Abstract

A frequency and phase control circuit for a television receiver comprises a first phase detector for adjusting the frequency of the horizontal oscillator in response to horizontal sync pulses. A second phase detector maintains a predetermined phase relationship between the deflection circuit switching signals and a pulse indicative of the amplitude zero crossing of the horizontal deflection current. The zero crossing signal is derived from a transformer in series with the horizontal deflection winding. The transformer is normally magnetically saturated by the deflection current, except when the deflection current amplitude is close to zero. A voltage is then developed across the transformer secondary windings, producing the zero crossing pulse.