High voltage regulation circuit for a color television receiver

Claim 1

In a horizontal deflection and high voltage system for television including a D.C. power source for supplying a D.C. voltage to the system, a high voltage terminal for connection to a picture tube, a horizontal deflection yoke energizable to produce line deflection of an electron beam, switching means connected to said horizontal deflection yoke for supplying an energizing voltage to said horizontal deflection yoke to produce line trace movements of the electron beam and for cutting off such energizing voltage to produce retrace movements of the electron beam in response to input horizontal deflection synchronizing signals, transformer means connected to said horizontal deflection yoke for producing a high voltage flyback pulse, and rectifying means connected to said high voltage terminal for rectifying the flyback pulse to produce high voltage power for electron beam acceleration, a high voltage regulation circuit comprising: variable inductance means comprising a saturable core, a high voltage regulation coil wound around at least one portion of said saturable core, said high voltage regulation coil, said horizontal deflection yoke and said transformer means being connected together in parallel; a control winding wound around a different portion of said saturable core, one end of the control winding being connected to said switching means; D.C. blocking means connected between said D.C. power source and said switching means for preventing a D.C. current from flowing into said high voltage regulation coil, said horizontal deflection yoke and said transformer means; and an inductance element connected in series with said control winding between said D.C. power source and said switching means for preventing an A.C. current from flowing into the control winding; whereby the inductance of said high voltage regulation coil is controlled so as to decrease or increase in inductance in response to an increase or a decrease, respectively, in the D.C. current flowing from said D.C. power source into said control winding.