High voltage regulation circuit for a color television receiver

Claim 2

In a horizontal deflection and high-voltage system for television including a DC power source for supplying a DC 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 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 sychronizing 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: a variable inductance element connected between said switching means and said DC power source in parallel with said horizontal deflection yoke, so that the DC current generated from said DC power source is supplied to said switching means through said variable inductance element, whereby the inductance of said inductance element is controlled so as to decrease or increase the inductance in response to an increase or a decrease in the DC current from said DC power source, respectively.

Claim 3

The combination defined in claim 1, wherein said horizontal deflection yoke and said transformer means generating said flyback pulse are coupled respectively with said DC power source through at least one capacitor.

Claim 4

In a color television receiver having a. a color picture tube; b. a DC power source for the receiver; c. horizontal deflection means for providing a horizontal line deflection of an electron beam in said tube, comprising: switching means supplied with input periodic line synchronizing signals and selectively rendered conductive in response to the line synchronizing signals supplied thereto; yoke coil means for providing, when energized, the horizontal line deflection of the electron beam in said tube; first connecting means for connecting said DC power source through said yoke coil means in series with said switching means, so that a series circuit of said DC power source and said yoke coil means is coupled across said switching means, and resonant means connected in parallel across said switching means for forming together with said yoke coil means a parallel resonant circuit, said resonant means including a capacitor and a damper diode so that a sawtooth current with steep retrace portions therein is applied through said yoke coil means due to operation of said switching means; and d. a high voltage circuit for generating a DC high voltage, comprising: a flyback transformer having primary and secondary windings electromagnetically coupled together; second connecting means for coupling said primary winding of said flyback transformer in parallel with said yoke coil means to form a parallel circuit therewith so that a part of said sawtooth current flows through said primary winding to produce a boosted high-voltage flyback across the secondary winding in response to the supply of the retrace portion of the sawtooth current to said primary winding, and a rectifying circuit connected to said secondary winding for rectifying the flyback pulse to produce the DC high voltage; e. A DC high-voltage regulation circuit comprising: variable inductance means including a variable inductance element for providing increasing and decreasing inductance in response to decrease and increase, respectively, of a current flowing therethrough; third connecting means for connecting said DC power source through said variable inductance means in Series with said switching means and to said secondary winding of said flyback transformer, respectively, so as to allow DC current from said DC power source to pass through said variable inductance means to said switching means and to said rectifying circuit via said secondary winding, and blocking means including at least one capacitor connecting both said yoke coil means and said primary winding of the flyback transformer in series with said DC power source and said switching means so that said variable inductance means, said yoke coil means and said primary winding are coupled in parallel together with respect to the AC component of the sawtooth current while the DC current is blocked from passing through both said yoke coil means and said primary winding, whereby increase and decrease in the DC high-voltage due to decrease and increase, respectively, of the DC high-voltage current flowing through said color picture tube directly effects increase and decrease, respectively, in the inductance of the variable inductance element of the variable inductance means, to thereby regulate the fluctuation of said DC high voltage, wherein said variable inductance means includes: a magnetically saturable core; a high voltage regulation coil wound around said core, said coil acting as said variable inductance element, and said third connecting means includes means for connecting said high-voltage regulation coil in series with said DC power source to form a series circuit therewith and for connecting the series circuit of said coil and said DC power source across said switching means so that the DC current from said DC power source to said switching means and said secondary winding flows through said coil, whereby the inductance of the coil is increased and decreased in response to decrease and increase, respectively, of the current flowing therethrough, to thereby regulate the fluctuation of the DC high voltage.

Claim 5

In a color television receiver having a. a color picture tube; b. a DC power source for the receiver; c. horizontal deflection means for providing a horizontal line deflection of an electron beam in said tube, comprising: switching means supplied with input periodic line synchronizing signals and selectively rendered conductive in response to the line synchronizing signals supplied thereto; yoke coil means for providing, when energized, the horizontal line deflection of the electron beam in said tube; first connecting means for connecting said DC power source through said yoke coil means in series with said switching means, so that a series circuit of said DC power source and said yoke coil means is coupled across said switching means, and resonant means connected in parallel across said switching means for forming together with said yoke coil means a parallel resonant circuit, said resonant means including a capacitor and a damper diode so that a sawtooth current with steep retrace portions therein is applied through said yoke coil means due to operation of said switching means; and d. a high voltage circuit for generating a DC high voltage, comprising: a flyback transformer having primary and secondary windings electromagnetically coupled together; second connecting means for coupling said primary winding of said flyback transformer in parallel with said yoke coil means to form a parallel circuit therewith so that a part of said sawtooth current flows through said primary winding to produce a boosted high-voltage flyback across the secondary winding in response to the supply of the retrace portion of the sawtooth current to said primary winding, and a rectifying circuit connected to said secondary winding for rectifying the flyback pulse to produce the DC high voltage; e. A DC high-voltage regulation circuit comprising: variable inductance means including a variable inductance element for providing increasing and decreasing inductance in response to decrease and increase, respectively, of a current flowing therethrough; third connecting means for connecting said DC power source through said variable inductance means in Series with said switching means and to said secondary winding of said flyback transformer, respectively, so as to allow DC current from said DC power source to pass through said variable inductance means to said switching means and to said rectifying circuit via said secondary winding, and blocking means including at least one capacitor connecting both said yoke coil means and said primary winding of the flyback transformer in series with said DC power source and said switching means so that said variable inductance means, said yoke coil means and said primary winding are coupled in parallel together with respect to the AC component of the sawtooth current while the DC current is blocked from passing through both said yoke coil means and said primary winding, whereby increase and decrease in the DC high-voltage due to decrease and increase, respectively, of the DC high-voltage current flowing through said color picture tube directly effects increase and decrease, respectively, in the inductance of the variable inductance element of the variable inductance means, to thereby regulate the fluctuation of said DC high voltage, wherein said variable inductance means includes: a magnetically saturable core; a high voltage regulation coil wound around said core, said coil acting as said variable inductance element, and said third connecting means includes means for connecting said high-voltage regulation coil in series with said DC power source to form a series circuit therewith and for connecting the series circuit of said coil and said DC power source across said switching means so that the DC current from said DC power source to said switching means and said secondary winding flows through said coil, whereby the inductance of the coil is increased and decreased in response to decrease and increase, respectively, of the current flowing therethrough, to thereby regulate the fluctuation of the DC high voltage.

Claim 6

In a color television receiver having a color picture tube, a DC power source for the receiver, a horizontal deflection output transistor supplied with periodic horizontal line synchronizing signals and operatively rendered conductive in response to said synchronizing signals supplied thereto, a damper diode and a resonant capacitor coupled respectively in parallel across the output of said transistor, a horizontal yoke coil for providing, when energized, a horizontal line deflection of an electron beam in said picture tube, a flyback transformer having primary and secondary windings coupled together, and a high-voltage rectifying circuit connected to said secondary winding, a DC high-voltage regulation circuit comprising a variable inductance assembly including a variable inductance element, which element has an inductance which varies indirectly in response to variation in the current passing through said assembly; first connecting means for connecting said DC power source in series through said variable inductance assembly to said transistor and to said secondary winding, respectively; second connecting means including at least a DC blocking capacitor for connecting both said yoke coil and said primary winding through said DC blocking capacitor in series to said DC power source and to both said transistor and said secondary winding so as to allow DC current from said DC power source to pass only through said variable inductance assembly to both said transistor and said rectifying circuit via said secondary winding and so as to couple said variable inductance assembly in parallel with said yoke coil and said primary winding to thereby form a parallel resonant circuit with said resonant capacitor and said damper diode, so that a sawtooth current flows through said primary winding and a high-voltage flyback pulse generated across the secondary winding is rectified by the rectifying circuit into a DC high voltage, whereby the increase and decrease in the DC high voltage are inversely regulated by increase and decrease, respectively, in the inductance of the variable inductance assembly which is directly controlled by the current flowing therethrough, wherein said variable inductance assembly comprises a magnetically saturable core, and a high-voltage regulation coil wound around said core, which coil is connected at one end to said DC power source and at the other end thereof to said transistor and to said secondary winding.

Claim 7

In a color television receiver having a color picture tube, a DC power source for the receiver, a horizontal deflection output transistor supplied with periodic horizontal line synchronizing signals and operatively rendered conductive in response to said synchronizing signals supplied thereto, a damper diode and a resonant capacitor coupled respectively in parallel across the output of said transistor, a horizontal yoke coil for providing, when energized, a horizontal line deflection of an electron beam in said picture tube, a flyback transformer having primary and secondary windings coupled together, and a high-voltage rectifying circuit connected to said secondary winding, a DC high-voltage regulation circuit comprising a variable inductance assembly including a variable inductance element, which element has an inductance which varies indirectly in response to variation in the current passing through said assembly; first connecting means for connecting said DC power source in series through said variable inductance assembly to said transistor and to said secondary winding, respectively; second connecting means including at least a DC blocking capacitor for connecting both said yoke coil and said primary winding through said DC blocking capacitor in series to said DC power source and to both said transistor and said secondary winding so as to allow DC current from said DC power source to pass only through said variable inductance assembly to both said transistor and said rectifying circuit via said secondary winding and so as to couple said variable inductance assembly in parallel with said yoke coil and said primary winding to thereby form a parallel resonant circuit with said resonant capacitor and said damper diode, so that a sawtooth current flows through said primary winding and a high-voltage flyback pulse generated across the secondary winding is rectified by the rectifying circuit into a DC high voltage, whereby the increase and decrease in the DC high voltage are inversely regulated by increase and decrease, respectively, in the inductance of the variable inductance assembly which is directly controlled by the current flowing therethrough, wherein said variable inductance assembly comprises a magnetically saturable core, and a high-voltage regulation coil wound around said core, which coil is connected at one end to said DC power source and at the other end thereof to said transistor and to said secondary winding.

Claim 8

In a horizontal deflection and high-voltage system for television including a DC power source, a horizontal reflection yoke, switching means connected in series with said power source and said deflection yoke to selectively energize said deflection yoke from said power source in response to applied input horizontal deflection synchronizing signals, and high-voltage means connected to said deflection yoke for producing a high voltage for electron beam acceleration, a high-voltage regulation circuit comprising variable inductance means connected in parallel with said deflection yoke for providing increasing and decreasing inductance in response to decrease and increase, respectively, in the current flowing therethrough and blocking means for blocking DC current from passing through said deflection yoke from said power source.

Claim 9

In a horizontal deflection and high-voltage system for television including a DC power source, a horizontal reflection yoke, switching means connected in series with said power source and said deflection yoke to selectively energize said deflection yoke from said power source in response to applied input horizontal deflection synchronizing signals, and high-voltage means connected to said deflection yoke for producing a high voltage for electron beam acceleration, a high-voltage regulation circuit comprising variable inductance means connected in parallel with said deflection yoke for providing increasing and decreasing inductance in response to decrease and increase, respectively, in the current flowing therethrough and blocking means for blocking DC current from passing through said deflection yoke from said power source.

Claim 10

The combination defined in claim 5, wherein said high voltage means includes a flyback transformer having a primary winding connected in parallel to said deflection yoke and a secondary winding coupled to said primary winding and connected to rectifier means for producing said high voltage, said blocking means also blocking DC current from passing through said primary winding from said power source.

Claim 11

The combination defined in claim 6, wherein said blocking means includes first and second capacitors connected in series between said primary winding and said deflection yoke, respectively, and said power source, said variable inductance means being connected directly to said power source.

Claim 12

The combination defined in claim 7, wherein said variable inductance means includes a variable inductance element in series with a third capacitor connected across said high-voltage regulation coil inductively coupled through a magnetically saturable core to said variable inductance element, said high-voltage regulation coil being connected in series between said power source and said switching means.