Horizontal deflection system with boosted B plus

Abstract

A boosted B+ regulator in a horizontal deflection system adds a voltage derived from the deflection system to the line-rectified direct current voltage supplying the deflection system in such amount as to maintain a substantially constant boosted B+ supply voltage in the presence of variations of line voltage. Variations of the line-rectified voltage are sensed by a reference voltage network and added to a constant ramp voltage, the combination of voltages being applied to control the period of conduction of an active current conducting device which permits energy derived from the deflection system to be added to the line-rectified voltage supply for maintaining a regulated boosted supply voltage for the deflection system. In one embodiment the energy derived from the deflection system is half-wave rectified by the active current conducting device. In a second embodiment the energy is full-wave rectified by the combination of the active current conducting device and an oppositely poled unidirectional current conducting device.

What is claimed is: 
     
       1. In a deflection system for supplying energy to a deflection winding during a portion of each deflection interval, a voltage boost circuit comprising: a source of direct current voltage subject to undesirable voltage variations;   switching means in said deflection system operable from a first to a second state during each deflection interval .Iadd.for developing a second source of deflection rate alternating current voltage within said deflection system.Iaddend. ;   inductance means coupled to said source of direct current voltage and to said .[.switching means for supplying operating current to said deflection system during a portion of each deflection interval.]. .Iadd.second source of deflection rate alternating current voltage for combining said second source of alternating current voltage with said source of direct current voltage.Iaddend.; and   .[.rectifying means including.]. active current conducting .Iadd.rectifying means .Iaddend.means coupled to said inductance means, .[.across which inductance means is developed an alternating current voltage in response to said switching means operating from said first to said second state, and to said source of direct current voltage.]. for rectifying said alternating current voltage and adding it to the voltage produced by said source of direct voltage.   
     
     
       2. A voltage boost circuit according to claim 1 further including control means coupled to said active current conducting .Iadd.rectifying .Iaddend.means for controlling the period of conduction thereof; and   voltage sensing means coupled to said control means and to said source of direct current voltage for developing a signal representative of voltage variations of said source of direct current, said control means being responsive to said signal for determining the period of conduction of said active current conducting .Iadd.rectifying .Iaddend.means for determining the amount of energy added to said source of direct current voltage for maintaining the voltage from said source substantially constant.   
     
     
       3. A voltage boost circuit according to claim 2 wherein said active current conducting .Iadd.rectifying .Iaddend.means is a silicon controlled rectifier and said control means includes a transistor, an output electrode of said transistor being coupled to the gate electrode of said SCR. 
     
     
       4. A voltage boost circuit according to claim 3 wherein said control means includes means coupled to said inductance for supplying a constant ramp voltage to the control electrode of said control transistor for biasing said electrode. 
     
     
       5. A voltage boost circuit according to claim 4 wherein said voltage sensing means includes a voltage divider coupled between sid direct current voltage source and a point of reference potential, and a zener diode having one terminal coupled to the control electrode of said control transistor and the other terminal coupled to a point on said voltage divider whereby the voltage at said point determines the time at which said zener diode conducts during the period of said ramp voltage and thereby determines the conduction time of said transistor and said SCR during each deflection cycle for determining the amount of boost voltage added to the voltage of said direct current supply source. 
     
     
       6. A voltage boost circuit according to claim 5 wherein said .Iadd.active current conducting .Iaddend.rectifying means includes a first capacitor coupled to the main current conducting path of said SCR and to said source of direct current voltage for receiving charge from said SCR for boosting said direct current voltage. 
     
     
       7. A voltage boost circuit according to claim 6 wherein said .Iadd.active current conducting .Iaddend.rectifying means includes a diode coupled to said inductance means and oppositely poled from the main current conducting path of said SCR for rectifying the opposite polarity portion of said alternating current voltage waveform than is rectified by said SCR, and a second capacitor coupled to said diode and to the junction of said SCR and said inductance means for receiving charge from said diode for further boosting said direct current voltage. 
     
     
       8. In a television deflection system in which a first switching means couples a deflection winding across a source of energy during a trace interval of each deflection cycle and a second switching means replenishes energy to said source of energy during a commutation interval of each deflection cycle, a voltage regulator circuit comprising: a source of direct current voltage subject to undesirable voltage variations;   means including an inductance coupled to said source of direct current voltage and to said first switching means for supplying operating current to said first switching means;   a winding magnetically coupled to said inductance, having a first terminal coupled to said source of direct current voltage, said winding having developed across it an alternating current voltage as said first switching means operates from one state to another during the commutation and trace intervals of each deflection cycle;   energy storage means coupled to said source of direct current voltage;   an active current conducting device having its main current conduction path coupled between a second terminal of said winding and said energy storage means and poled to conduct current during the commutation interval of each deflection cycle for rectifying a portion of said alternating current waveform developed across said winding, thereby adding energy to said energy storage means and boosting said direct current voltage;   control means coupled to a control electrode of said active current conducting device for determining the period of conduction of said device during each commutation interval; and   voltage sensing means coupled to said energy storage means and to said control means for developing signals representative of variations of said direct current voltage, said control means being responsive to said signals for determining the period of conduction of said active current conducting device for controlling the amount of energy added to said energy storage means for maintaining said direct current voltage substantially constant.   
     
     
       9. A voltage regulator according to claim 8 wherein said control means includes a transistor, an output electrode of which is coupled to the gate electrode of said active current conducting device and further includes means coupled to said inductance for supplying a constant ramp voltage to the control electrode of said transistor for biasing said electrode. 
     
     
       10. A voltage regulator according to claim 9 wherein said voltage sensing means includes a voltage divider coupled between said direct current voltage source and a point of reference potential, and a zener diode having one terminal coupled to the control electrode of said control transistor and the other terminal coupled to a point on said voltage divider whereby the voltage at said point determines the time at which said zener diode conducts during the period of said ramp voltage and thereby determines the conduction time of said transistor and said active current conducting device during each deflection cycle for determining the amount of boost voltage added to the voltage of said direct current supply source. 
     
     
       11. A voltage regulator according to claim 10 wherein an inductance is serially coupled between said second terminal of said winding and said active current conducting means for limiting the charging current passed by said active current conducting device to said energy storage means. 
     
     
       12. A voltage regulator according to claim 11 wherein said inductance means includes a winding of the horizontal output transformer of said deflection system for adding flyback pulse energy to said deflection system energy which is rectified by said active current conducting device. 
     
     
       13. In a television deflection system in which a first switching means couples a deflection winding across a source of energy during a trace interval of each deflection cycle and a second switching means replenishes energy to said source of energy during a commutation interval of each deflection cycle, a voltage regulator circuit comprising: a source of direct current voltage subject to undesirable voltage variations;   means including an inductance coupled to said source of direct current voltage and to said first switching means for supplying operating current to said first switching means;   a winding magnetically coupled to said inductance, having a first terminal coupled to said source of direct current voltage, said winding having developed across it an alternating current voltage as said first switching means operates from one state to another during the commutation and trace intervals of each deflection cycle;   first and second energy storage means coupled to said source of direct current voltage;   rectifying means including an active current conducting device having its main current conduction path coupled between a second terminal of said winding and said first energy storage means and poled to conduct current during the commutation interval of each deflection cycle for rectifying a portion of said alternating current waveform developed across said winding, thereby adding energy to said first energy storage means and boosting said direct current voltage, and a unidirectional current conducting means having one terminal coupled to said second terminal of said winding and poled to conduct current in the opposite direction than said active current conducting means and having its other terminal coupled to said second energy storage means for rectifying the trace interval portion of said alternating current waveform and adding energy to said second energy storage means for further boosting said direct current voltage;   control means coupled to a control electrode of said active current conducting device for determining the period of conduction of said device during each commutation interval; and   voltage sensing means coupled to said energy storage means and to said control means for developing signals representative of variations of said direct current voltage, said control means being responsive to said signals for determining the period of conduction of said active current conducting device for controlling the amount of energy added to said energy storage means for maintaining said direct current voltage substantially constant.   
     
     
       14. A voltage regulator according to claim 13 wherein said control means includes a transistor, an output electrode of which is coupled to the gate electrode of said active current conducting device and further includes means coupled to said inductance for supplying a constant ramp voltage to the control electrode of said transistor for biasing said electrode. 
     
     
       15. A voltage regulator according to claim 14 wherein said voltage sensing means includes a voltage divider coupled between said direct current voltage source and a point of reference potential, and a zener diode having one terminal coupled to the control electrode of said control transistor and the other terminal coupled to a point on said voltage divider whereby the voltage at said point determines the time at which said zener diode conducts during the period of said ramp voltage and thereby determines the conduction time of said transistor and said active current conducting device during each deflection cycle for determining the amount of boost voltage added to the voltage of said direct current supply source. 
     
     
       16. A voltage regulator according to claim 15 wherein an inductance is serially coupled between said first terminal of said winding and said active current conducting means for limiting the charging current passed by said active current conducting means to said second energy storage means. .Iadd. 17. A voltage regulator for a deflection system, comprising: a deflection circuit operable for producing alternating current energy during each deflection cycle;   means for generating a first direct voltage including a controllable unidirectional conducting switching means and a capacitor coupled to said deflection circuit, a first polarity of said alternating current energy charging said capacitor through said switching means, said capacitor providing said first direct voltage to said deflection circuit;   a source of second unregulated direct voltage;   means coupling said second unregulated direct voltage to said first direct voltage generating means for establishing a nominal direct voltage reference level for said first direct voltage; and   means coupled to said first direct voltage generating means and responsive to level variations in said first direct voltage for controlling the start of conduction of said switching means, a second polarity of said alternating current energy controlling the end of conduction of said switching means, for maintaining said first direct voltage substantially constant. .Iaddend. .Iadd. 18. A voltage regulator for a deflection system, comprising:   a source of non-regulated direct current voltage;   a deflection circuit comprising first switching means coupled to an inductance including a plurality of windings for providing voltage pulses at said deflection rate in said windings;   energy storage means;   second controllable switching means coupled to said source, a first of said windings, and to said energy storage means for charging said storage means from said first winding through said second switching means; and   control means coupled to said inductance for receiving deflection rate voltage pulses therefrom, said control means coupled to a source of direct current representative of any variations in the voltage level at said energy storage means for producing control signals representative of said variations, said control signals coupled to said second switching means for controlling the conduction thereof during each deflection cycle for maintaining a substantially constant voltage level in said energy storage means. .Iaddend. .Iadd. 19. A regulated voltage source for energizing a television horizontal deflection circuit from a source of unregulated potential, said horizontal deflection circuit including a source of periodically recurrent voltage waves generated by recurrent operation at the horizontal deflection rate of a first switching means serially coupled with a first inductance means coupled to an output terminal of the regulated voltage source, said regulated voltage source comprising:   second inductance means magnetically coupled to said first inductance means and serially coupled with said source of unregulated potential and to said output terminal of the regulated voltage source for coupling the unregulated voltage and said periodically recurrent voltage waves to said output terminal of the regulated voltage source;   controllable rectifying means including a control electrode and further including a main current conducting path serially coupled with said second inductance means for controllably coupling the unregulated potential and said periodically recurrent voltage waves to said output terminal of the regulated voltage source; and   voltage control means coupled to said source of periodically recurrent voltage waves, to said output terminal of the regulated voltage source and to said control electrode of said controllable rectifying means for recurrently gating said controllable rectifying means into conduction under the control of said recurrent voltage waves and said regulated voltage for maintaining the regulated voltage substantially constant. .Iaddend. .Iadd. 20. A regulating system for a horizontal deflection generator, comprising:   a horizontal deflection generator;   a source of direct current;   sensing means coupled to a source of voltage representative of the energy level in said horizontal deflection generator for producing a control signal;   control means responsive to said control signal;   inductance means coupled to said horizontal deflection generator and having developed therein an alternating current voltage at the horizontal deflection rate; and   a controllable switch serially coupled to said source and said inductance means for supplying operating current to said horizontal deflection generator through said inductance means, said controllable switch changing from a conducting to a nonconducting state when current in said inductance means decreases in magnitude to zero in response to a reversal of polarity of said alternating current voltage during each horizontal deflection interval, a control electrode of said controllable switch coupled to said control means for determining the duration of conduction of said controllable switch during each horizontal deflection interval for regulating the energy level in said horizontal deflection generator.   
     
     
        .Iaddend..Iadd. 21.  A circuit according to claim 20 wherein said controllable switch comprises a silicon controlled rectifier. .Iaddend..Iadd. 22. A circuit according to claim 20 wherein said horizontal deflection generator includes first switching means for coupling a deflection winding across a source of energy during a trace interval of each deflection cycle and a second switching means for replenishing energy to said source of energy during a commutation interval of each deflection cycle. .Iaddend..Iadd. 23. A circuit according to claim 22 wherein said inductance means comprises a first winding coupled to said second switching means and a second winding coupled to said controllable switch, said second winding magnetically coupled to said first winding. .Iaddend. .Iadd. 24. A circuit according to claim 23 wherein said source of voltage representative of the energy level in said horizontal deflection generator comprises an energy storage capacitor coupled to an output terminal of said controllable switch. .Iaddend..Iadd. 25. A circuit according to claim 24 wherein said sensing means comprises a voltage divider coupled to said energy storage capacitor. .Iaddend..Iadd. 26. A circuit according to claim 22 wherein said source of voltage representative of the energy level in said horizontal deflection generator comprises rectifying means coupled to a first terminal of said horizontal deflection generator, at which first terminal an alternating polarity horizontal deflection rate potential representative of the energy level in said horizontal deflection generator is produced. .Iaddend..Iadd. 27. A circuit according to claim 26 wherein said controllable switch comprises a silicon controlled rectifier. .Iaddend. .Iadd. 28. A voltage requlated deflection circuit comprising: a deflection circuit;   a source of first voltage for providing energy to said deflection circuit;   first means for coupling said first voltage to said deflection circuit, said first means including a controlled semiconductor means coupled to an inductance means across which inductance means a deflection rate voltage is developed, a first polarity of said deflection rate voltage decreasing to zero current flowing in said inductance means for turning off said controlled semiconductor means during each deflection cycle;   sensing means responsive to level variations representative of said first voltage for providing a first signal representative of said level variations; and   control means coupled to a control terminal of said controlled semiconductor means and resonsive to said first signal and to a deflection rate signal for providing to said controlled semiconductor means a control signal during each deflection cycle for varying the start of conduction of said controlled semiconductor means, thereby regulating the amount of said energy coupled to said deflection circuit. .Iaddend. .Iadd. 29. A regulating system for a horizontal deflection generator, comprising:   a horizontal deflection generator including an inductance means having developed therein an alternating current voltage at the horizontal deflection rate;   a source of direct current;   sensing means coupled to a source of voltage representative of the energy level in said horizontal deflection generator for producing a control signal;   control means responsive to said control signal; and   a controllable switch serially coupled to said source and said inductance means for supplying operating current through a main conducting path of said switch to said horizontal deflection generator through said inductance means, a reversal of polarity of said alternating current voltage in said inductance means during each horizontal deflection interval decreasing the current in said main conducting path sufficiently to thereby turn off said controllable switch, a control electrode of said controllable switch coupled to said control means for determining the duration of conduction of said controllable switch during each horizontal deflection interval for maintaining a substantially constant energy level in said horizontal deflection generator. .Iaddend.