Deflection mains-supply concept for television sets

Claim 1

A deflection line-supply arrangement for television sets in which the line supply is isolated from the television circuits, comprising: a source of alternating-current voltage with means for rectifying a.c. voltage to direct-current voltage; an inductance, and switch means; a driver circuit for periodically opening and closing said switch means in accordance with line frequency of said alternating-current voltage source, said source of alternating-current voltage being applied to said switch means through said inductance; a horizontal-deflection winding, said switch means generating operating voltages for said television circuits and generating a deflection current through said horizontal-deflection winding; a line transformer connected to a diode and a winding, magnetic energy stored in said inductance when said switch means is turned off being transmitted through said winding and said diode to said line transformer; said line transformer having means for generating a plurality of voltages for operating various television circuits; said line transformer having a line-isolated end, and means for obtaining energy from a switched vertical stage on said line-isolated end of said line transformer; a pulse transformer comprising a line-isolating coupling, said line transformer having a primary side and a secondary side, start-up for said switch means being provided on said secondary side and transmitted to said primary side through said pulse transformer; said line supply and said television circuits having grounds isolated from one another, said horizontal-deflection winding being connected to said line supply and said vertical-deflection circuit being isolated from said line supply; a control circuit connected to the line supply end and a line oscillator on the line supply isolated end, said control circuit being started up through said pulse transformer by said line oscillator; a protective circuit connected to the line supply end; sensor means transmitting information to said protective circuit when said switch means is overloaded for deactivating said driver circuit, said line supply end having a start-up circuit providing pulses of increasing width to said control circuit, said driver circuit, said switch means, and said protective circuit; said line isolated end having a horizontal oscillator with phase-comparison stages and an output stage connected to said pulse transformer for transmitting start-up pulses; said pulse transformer transmitting a substantially wide pulse signal without control information, said television circuits being turned on by applying operating voltage to said horizontal oscillator with said output stage; said start-up circuit providing said pulses of increasing width for starting up said driver circuit, said pulse width increasing constantly until said control circuit assumes control of the pulse widths.