Abstract: Serially coupled first and second capacitors are charged from a DC source of unregulated input voltage through the primary winding of a flyback transformer of a horizontal deflection circuit. The voltage across the first capacitor is established as the voltage difference between the input voltage and the voltage across the second capacitor. The first capacitor functions as a trace capacitor for a horizontal deflection winding. A switch couples a trace voltage to the horizontal deflection winding to generate a trace deflection current. The switch also couples a first winding of a saturable reactor to the second capacitor to provide a capacitor discharge current path. A bias current flowing in a second winding of the saturable reactor varies the effective inductance of the first winding in response to energy level changes in the deflection circuit to control the voltage across the second capacitor.

Abstract: First and second capacitors are charged from a DC source of unregulated input voltage through the primary winding of a flyback transformer of a horizontal deflection circuit. The average voltage across the first capacitor is established as the voltage difference between the input voltage and the average voltage across the second capacitor. The first capacitor functions as a trace capacitor for a horizontal deflection winding. A switch applies a trace voltage to the horizontal deflection winding to generate a trace deflection current. The switch also applies the voltages developed across the second capacitor and across a flyback transformer secondary winding to a regulator inductance to control the flow of current in the second capacitor. The current flowing through the inductance is varied in order to control the voltage across the second capacitor for regulating a selected deflection circuit quantity.

Abstract: To decrease the internal resistance of a transformer operable as a television line transformer of the "diode-split" type, the secondary winding sections are matched to each other and to the frequency of operation of the transformer in such a manner that the current in the respective sections will flow at respectively different instants of time; in a preferred form, the winding sections, on the average, are tuned to a harmonic of the frequency of the signal applied to the primary and are positioned on winding forms or holders such that the distance between the bottom wall of the primary and the bottom wall of the secondary is constant over the entire length of the windings. Preferably, the tuning of the respective winding sections is effected by matching of the primary winding to the secondary within the region of the secondary winding sections.

Abstract: A regulated power supply device, in particular for a line sweep circuit in a television receiver, containing a chopper circuit (10) which contains in series an inductor (16) and a bidirectional switch (15), which is controlled and mounted in parallel with a capacitor (13), forming a resonant circuit with the inductor (16) when the chopper switch (15) opens. The inductor (16) contains a winding (21), called the power supply winding, of a transformer (20), called the line transformer, in which another winding (22), mounted in series with a reservoir capacitor (33), is connected in parallel with another bidirectional switch (35 and 36), which equips the line sweep output stage (30). The transfer of energy between the chopper circuit (10) and the output stage (30) is done through the windings (21 and 22) of the transformer (20) and its effect is to charge the reservoir capacitor (33) which feeds, apart from the output stage (30), the preceding stages of the sweep circuit (which are not shown).

Abstract: A horizontal oscillator provides switching signals for use by a trace switch of a horizontal deflection circuit and to drive a push-pull output stage. The push-pull output stage provides an AC supply voltage to the primary of a power transformer. The rectified secondary winding voltage of the transformer provides a B+ supply voltage to the deflection circuit. After the elapse of a start-up interval, energization voltage for the horizontal oscillator is provided by either the power transformer or the deflection circuit. During the start-up interval the push-pull output stage self-oscillates as an astable multivibrator to develop the AC supply voltage within that interval.

Abstract: A trace switch including a horizontal output transistor is coupled across the series arrangement of a horizontal deflection winding and trace capacitor. The trace capacitor is charged from a source of unregulated DC input voltage through the primary winding of a flyback transformer. The emitter of the horizontal output transistor is coupled to ground through a first winding of a second transformer. A second capacitor is coupled between ground and the series arrangement of the deflection winding and trace capacitor. The average trace voltage across the trace capacitor is constrained to assume the difference in voltage between the unregulated input voltage and the voltage developed across the second capacitor. The charge/discharge cycle of the second capacitor is controlled by the current flowing in the second transformer.

Abstract: A deflection generator develops scanning current in a horizontal deflection winding. A high voltage winding of a flyback transformer generates a high voltage for the picture tube ultor terminal. A high voltage safety circuit includes a flyback transformer secondary winding for applying a peak detected retrace pulse voltage to a disabling latch circuit. If the high voltage exceeds predetermined values, the latch is energized and disables normal operation of the deflection generator. Components of the sustaining current that maintains the latch in a regeneratively conducting state are derived from two voltage sources, with the current component derived from one of the two voltage sources by itself insufficient to maintain the latch in the regeneratively conducting state.

Abstract: A high voltage limiting circuit for a television receiver employs a negative pulse sample from a tertiary winding on a flyback transformer as a measure of high voltage. When the amplitude of the negative pulse sample exceeds a predetermined value, indicating excessive high voltage, a limiting circuit applies a voltage to an automatic frequency control input of a horizontal oscillator to increase the frequency of the horizontal oscillator. The increased frequency limits further increase in high voltage.

Abstract: First and second resonant circuits store energy from a supply. First and second switches are respectively coupled to the first and second resonant circuits for generating resonant oscillations in the resonant circuits. A deflection circuit coupled to one of the resonant circuits has energy transferred to the deflection circuit during the resonant oscillations. A control circuit coupled to the switches varies the conduction angle overlap of the resonant oscillations in the resonant circuits for providing energy regulation.

Abstract: A flyback transformer includes a high voltage winding with a first rectifier coupled to the high voltage lead and a second rectifier coupled to the ground return lead. The rectifiers are poled in the same direction to conduct beam current and block the DC current path in the winding during the trace interval. The distributed capacity forms a capacitive voltage divider and developes an intermediate DC voltage in the high voltage winding. The intermediate DC voltage developed at an intermediate AC null terminal of the high voltage winding is selectively adjusted by structure which is selectively capable of adding sufficient distributed capacity to appropriately change the capacitive voltage division ratio.

Abstract: In a fly-back transformer, the tertiary winding for obtaining the secondary B power source is wound in a position where the coupling with the primary winding is weak and where it interlinks the leakage flux of the secondary winding with the primary winding, and the output of the tertiary winding is rectified during the scanning period of a horizontal deflection circuit of a television receiver. Accordingly, only the wave crest value of the ringing is made smaller, regardless of the shot pulse to be obtained within the secondary winding.

Abstract: The trace switch of a horizontal deflection circuit is coupled to a secondary winding of a flyback transformer. The primary winding is coupled to a source of energy and a regulator switch. A control circuit varies the phase angle of the regulator switch in accordance with an energy level of the deflection circuit. A regulator commutating inductance in combination with a commutating and tuning capacitance controls the duration of conduction of the regulator switch. The capacitance independently tunes with a flyback transformer winding to transfer energy from the source in a resonant manner.

Abstract: A protection circuit for television receiver picture tubes and related components which includes a diode which is forward biased during normal operation to provide coupling of the tube control grid to ground or reference potential and which is reverse biased during operation at excessively large beam currents, the reverse biasing of the diode causing the beam current to flow through a large grid-cathode resistor thereby effectively limiting electron beam current.

Abstract: A television horizontal deflection circuit is provided with a flyback transformer and a switching regulator transformer which are substantially magnetically independent of each other and which are connected with their primaries in series with a switching device and a source of input voltage. The secondary winding of the switching regulator transformer supplies power to a regulated D.C. voltage supply, which in turn supplies power to a resonant circuit. The resonant circuit is connected to a reference potential through the switching device and includes a damper diode, a resonant capacitor, a deflection coil and a series connected capacitor. A secondary winding of the flyback transformer is used to derive a high voltage for use in the high voltage anode of a television picture tube. In a preferred embodiment, the flyback transformer contains an additional winding which is connected between the regulated D.C. voltage supply and the resonant circuit.

Abstract: An input transformer primary winding is series coupled with an unregulated voltage source and a bidirectional switch. The secondary winding is coupled to a deflection circuit switch through a second switch. The transformer leakage inductance serves as the source input impedance. The transformer windings and second switch are so polarized as to provide for simultaneous conduction of the bidirectional and second switches. Regulation is achieved by varying the turn-on instant of the bidirectional switch within a deflection cycle. The bidirectional switch is commutated off by a resonant circuit coupled to the switch.

Abstract: A horizontal fly-back transformer having a high voltage winding for generating high voltage pulses fed to the anode of a cathode ray tube is provided with a tertiary winding which in turn is connected to a rectifying-smoothing circuit, and a DC voltage in proportion to the anode high voltage is obtained from the rectifying-smoothing circuit. The DC voltage is divided by a resistor divider circuit and a division of the DC voltage is fed to the gate of a thyristor via a Zener diode which is turned on when the anode high voltage exceeds a critical voltage. A thryistor gate current which flow concurrent with the conduction of the Zener diode causes the thyristor to turn on so that the operating voltage o a horizontal oscillator circuit may be reduced until the horizontal oscillator circuit stops oscillating, thereby preventing generation of the anode high voltage.

Abstract: To regulate the DC input voltage to a deflection circuit, a saturable reactor winding is series coupled with an unregulated DC voltage, a diode, a flyback transformer winding and an input terminal of the deflection circuit. During retrace, the diode is forward biased and conducts input current to the input terminal. During trace, the opposite polarity trace voltage commutates off the diode and decouples the input terminal from the unregulated DC voltage at a varied instant within trace in accordance with the impedance of the saturable reactor winding. The average DC voltage across the diode fluctuates with diode conduction angle variations and maintains a regulated input voltage at the input terminal despite fluctuations in the unregulated DC voltage.

Abstract: A source of unregulated voltage and a source of rectified deflection rate alternating current voltage is coupled to a deflection circuit. A magnetic switching structure includes two loading windings series coupled with the source of deflection rate voltage. A control circuit developes a bias current in a control winding which permits the load windings to alternately magnetically saturate within each deflection cycle to switch controlled amounts of energy to the deflection circuit.

Abstract: A line time base in a television receiver including a symmetrical limiter for cutting off the line flyback pulses from which the reference signal for the synchronizing circuit is derived. As a result a slice is obtained whose duration and amplitude is constant and independent of the load on the EHT generator.

Abstract: A horizontal deflection circuit drives a deflection winding and an ultor voltage generator. The energizing voltage for the horizontal deflection generator is regulated by a switching regulator including an SCR, a filter inductor, a filter capacitor and an SCR turn-off winding. The turn-off winding couples a retrace pulse to the SCR during each horizontal retrace interval to turn the SCR off in preparation for the following regulation interval. A second winding is magnetically coupled to the deflection circuit and through a diode to the filter inductor for providing a path by which current can continue to flow in the filter inductor during SCR nonconduction and which effectively couples the filter inductance across the deflection winding. Variations in kinescope beam current cause corresponding variations in the current through the filter inductor at the end of the trace interval.

Abstract: A circuit for selectively supplying current to the horizontal oscillator from one of two voltage sources. The first voltage source is primarily used to supply current to the horizontal output stage and supplies the oscillator only during startup of the horizontal deflection system. The second source is derived from a winding on the flyback transformer and supplies current to the oscillator after the startup period, that is, after its voltage or another or other voltages developed by sources derived from flyback windings have reached values sufficient to assure sustained operation of the horizontal deflection system. A startup detector responsive to a flyback-derived voltage determines which of the two voltage sources provides current at the output of the starting network, that is, at the power supply terminal of the horizontal oscillator.

Abstract: A feedback voltage regulator for a television deflection apparatus having a deflection switching arrangement driving a deflection winding and supplied with power from a source of potential through a first inductor includes a second inductor coupled in series with the first. The second inductor conducts a substantially direct current towards the source of potential. An SCR is coupled in parallel with the second inductor and its conduction is duration modulated in response to the regulated voltage. The duration modulation controls the time during which the direct current is withdrawn from the deflection switching arrangement and first inductor and thereby maintains the regulated voltage substantially constant.

Abstract: A shutdown circuit both electrically and magnetically isolated from the horizontal deflection circuit and the flyback transformer. The voltage across a winding magnetically coupled to an inductive element carrying the current required by the deflection circuit and the flyback transformer is detected. The horizontal deflection circuit is disabled in response to voltages above a predetermined value. In an Iso-Hot type receiver having an oscillator coupled to the deflection circuit by an optically operating drive circuit, the drive circuit is rendered optically non-transmitting.

Abstract: An improved circuit for the stepwise variation of an operating voltage of a deflection amplifier of a magnetodynamic deflection system for a charged-particle beam in dependence upon a required deflection speed. At least one diode is coupled to a voltage supply source and is poled in its forward conduction direction to an operating voltage terminal of the deflection amplifier. At least one capacitor is coupled by a terminal thereof to the cathode of the diode, and a switch driven by a control device is coupled to the other terminal of the capacitor for connecting the capacitor either to ground through a resistor or to the anode of the diode.

Abstract: A horizontal output stage including a switching device for coupling the input of the horizontal output transistor to a feedback network and bias means during startup and to the secondary of an interstage coupling transformer during steady-state operation. During startup the output transistor operates in an oscillatory mode thereby developing an alternating current in the flyback transformer. The supply voltage for the horizontal oscillator is derived from a winding on the flyback transformer. Once this supply voltage reaches the value required for sustained operation of the oscillator, the switching device disconnects the output transistor from the feedback network and couples it to the interstage transformer so that the output transistor is driven by the signal developed by the horizontal oscillator.

Abstract: A source of unregulated direct voltage is commutated at the horizontal rate by a two-transistor switching regulator and applied across a transformer primary winding. The duty cycle of the alternations is controlled to maintain the peak-to-average value of a first portion of the alternations at a constant value. A rectifier serially coupled with a capacitor is coupled across the secondary winding of the transformer and produces a direct voltage across the capacitor from the first portion of the alternations. The junction of the rectifier and secondary winding is grounded. A television horizontal output transistor has its emitter grounded and its collector coupled through an inductance to the other end of the rectifier. A constant energy is stored in the inductance during each deflection cycle for application to the horizontal output stage. The horizontal output transistor is one of the two regulator transistors.

Abstract: A pair of output transistors forming a single-ended push-pull circuit are alternately turned on and off at a vertical cycle to supply a vertical deflection current to a vertical deflection yoke. A low voltage winding is wound on a horizontal flyback transformer connected to a horizontal output transistor. First and second rectifying circuits are provided for rectifying and filtering a horizontal scan period portion and a horizontal flyback portion, respectively, of the voltage developed across the winding, and d.c. outputs of the rectifying circuits are fed to the push-pull circuit as operating power therefor. The first rectifying circuit includes a capacitor-input filter circuit while the second rectifying circuit includes a choke-input filter circuit, a critical current of which choke-input filter is established between a maximum current and a minimum current required for the push-pull circuit.

Abstract: An electronic regulator produces a regulated direct voltage less than the raw direct voltage input. The load on the regulated output is the primary winding of the horizontal output transformer of a television horizontal deflection circuit. A secondary winding of the output transformer is connected in series with the source of raw direct voltage. An energy storage capacitor is coupled across the secondary winding, and charged therefrom by a gated rectifier. The regulated output voltage is taken across the raw direct voltage source and capacitor. An overvoltage protection circuit for protecting against fault conditions is provided. The protection circuit includes a diode coupled between the regulated output voltage terminal and the raw input voltage terminal. The diode is normally back-biased and becomes conductive when a fault condition makes the regulated voltage exceed the raw input voltage. A resistor in series with the secondary winding controls circulating currents in the event of an overvoltage fault.

Abstract: A deflection circuit coupled to a deflection winding produces scanning current in the winding. A deflection rate voltage is developed at a first terminal of the deflection circuit. A source of operating voltage supplies energy to the deflection circuit, and a sensing circuit coupled to a source of voltage representative of an energy level in the deflection circuit produces an error signal for a control circuit that provides first and second control signals. A controllable switch coupled to the source of operating voltage and the first terminal provides operating current to the deflection circuit through the controllable switch. A first portion of the deflection rate voltage, under normal conditions, commutates off the controllable switch.

Abstract: A circuit arrangement for combined line deflection and supply voltage stabilization. An EHT winding is wound on the same core as the switched-mode transformer in spite of the fact that different waveforms are present on the various windings of the transformer.

Abstract: To permit use of a circuit in which the energy derived during horizontal flyback is used to control vertical deflection, without damage to the vertical deflection system upon vertical flyback, the vertical deflection output stage is dimensioned to have a time constant which is less, preferably about half, of the time constant of the sawtooth wave generator controlling vertical deflection. The vertical deflection output stage forms, in essence, a parallel oscillatory circuit which, to provide the lesser time constant, is damped.

Abstract: In a circuit arrangement for providing a periodic saw-tooth current in a coil, e.g. a kinescope deflector coil, comprising a one-way conducting device that connects the coil to a voltage source, and a controllable switching device having a control electrode connectable to a periodic pilot-pulse source that makes the switching device conductive during part of the saw-tooth cycle, the switching device being connectable to a current source through an induction coil, the improvement wherein the latter is serially connected with the switching device, both being connected to the voltage source; and wherein a point common to the induction coil and to the switching device is connected through a capacitor to a transformer which latter is in turn connected to the one-way conducting device.

Abstract: An oscillator responsive to a control signal generates a first signal at a first rate at an output terminal. A first transistor is coupled to the output terminal and to a load circuit. Normal operation of the load circuit depends upon the first transistor switching conductive states at the first rate. A second complementary type conductivity transistor forms a complementary disabling latch with the first transistor. A fault signal activates the latch and prevents the first transistor from switching conductive states, thereby disabling normal load circuit operation.

Abstract: A deflection circuit of a television receiver produces scanning current in a deflection winding. The deflection circuit includes first and second terminals at which respective terminals first and second deflection rate voltages are developed. The first deflection rate voltage includes, under fault conditions, a fault component voltage present during at least a portion of a deflection cycle. The fault component voltage is substantially absent from the second deflection rate voltage. A protection circuit includes combining means coupled to the first and second terminals for combining the first and second deflection rate voltages for producing a fault signal at a third terminal under fault conditions. A circuit responsive to the voltage developed at the third terminal provides a disabling signal for disabling normal television receiver operation when the fault signal is present.

Abstract: A high voltage generating apparatus suitable for a television receiver. A flyback transformer has a secondary winding divided into a plurality of parts by at least a diode and a primary winding connected to a variable voltage divider circuit for varying the primary-side flyback pulse voltage. The variable voltage divider circuit is connected to an end of a focus capacitor with the other end thereof connected to the cathode of the diode, so that a variable pulse voltage is applied to the focus capacitor to regulate the focus voltage.

Abstract: A line sawtooth deflection current generator with modulating means for the purpose of correcting the amplitude variations of the current produced, the said modulating means including a stage operating in the switching mode.

Abstract: A high voltage protection system comprises a deflection winding, a deflection circuit for providing scanning current to the deflection winding, a high voltage circuit for providing a high voltage accelerating potential for beam current, and a beam current sensing circuit for providing a beam current signal representative of the beam current. A high voltage protection circuit is coupled to the deflection circuit and is responsive to the high voltage accelerating potential for disabling normal deflection circuit operation when the high voltage accelerating potential exceeds first predetermined values. A coupling apparatus is responsive to the beam current signal and couples a signal to the protection circuit when the beam current decreases to less than a given value for changing the magnitudes of the first predetermined values.

Abstract: A rectifying device, a switching device and a reference voltage device are coupled in parallel relationship between a winding of a transformer associated with the deflection circuitry of a television receiver and a filter capacitor of a power supply circuit for providing operating voltage to other portions of the receiver. The reference voltage device is also coupled to a control terminal of the switching device to control its conduction. Under normal conditions, the rectifying device is conductive in only one direction so that the filter capacitor is charged to a sufficient operating voltage to permit the normal operation of the receiver.

Abstract: A high voltage generator suitable for use in a television receiver set wherein a frequency dependent attenuation circuit is connected to a primary winding of a flyback transformer which generates a high voltage to be supplied to a CRT whereby a regulation for a high voltage is improved.

Abstract: A start-up circuit for a television receiver includes a circuit for rectifying the AC line voltage and a filter for providing a smoothed DC voltage. When the receiver is turned on, an initial interval exists in which an inrush current flows into the filter. A winding, magnetically coupled to an inductor in the path of the inrush current, develops an alternating current potential during the initial interval. This potential is rectified and provides a start-up operating voltage for the television receiver load circuits. During the steady state interval, a second circuit provides the operating voltage, and a third circuit couples to the winding a voltage which varies in value from the initial interval to the steady state interval in a manner which decouples the alternating current potential from the load circuits during the entirety of the steady state interval.

Abstract: A television receiver circuit includes a voltage regulator with a feedback circuit for providing a regulated B+ operating voltage, a horizontal deflection circuit including a resonant retrace circuit for generating a scanning current in a deflection winding for producing a raster, a high voltage circuit for providing an ultor voltage for beam current, and a high voltage protection circuit for disabling normal operation of the horizontal deflection circuit when the ultor voltage exceeds a predetermined magnitude. An impedance is included and is capable of being selectively coupled to the feedback circuit. A capacitance is also included and is capable of being selectively coupled to the resonant retrace circuit. Both means combined are selectively capable of decreasing the ultor voltage for preventing unnecessary disabling of the horizontal deflection circuit while maintaining a constant raster width.

Abstract: Apparatus is provided for preventing the generation of an excessively high voltage by the high voltage circuit of a CRT device, such as a television receiver, thereby avoiding the danger of producing injurious X-ray radiation and further minimizing the potential fire hazard attributed to such an excessively high voltage. A flyback transformer is connected to a resonant capacitor and is driven by a switching device synchronized with horizontal scanning pulses so that flyback pulses are produced during the normal retrace intervals in the horizontal deflection. A relatively low voltage power supply is coupled to the switching device to apply an operating voltage thereto. A first detecting circuit is coupled to the flyback transformer for detecting a high frequency component included in the flyback pulses in the event of a malfunction of the resonant capacitor, such as a disconnection of that capacitor, which high frequency component causes an excessively high voltage to be produced by the high voltage circuit.

Abstract: A regulated power supply for a CRT has an amplifier connected to the output of the high voltage power supply for sensing variations in the operating potential supplied to the CRT anode. The amplifier allows a double acting response to voltage fluctuations in this high voltage operating level supplied to the CRT anode which causes a directly adding voltage to feedback from the intermediate voltage power supply and also unloads the intermediate voltage power supply.

Abstract: The television receiver horizontal deflection transformer develops retrace pulses from which the high voltage is generated. A shutdown safety circuit arrangement monitors a predetermined minimum width of retrace pulse by comparing it with the duration of a locally produced standard pulse to determine an excess high voltage condition. When such a condition occurs, voltage is applied to the horizontal driver for disabling the deflection system.

Abstract: Control circuit for controlling a switched converter generating an output voltage which is independent of variations of the input voltage. For this purpose, a forward control is used with a sawtooth voltage of which both the variation during the pulse duration of the pulses applied to the switch of the converter and the slope are linear functions of the input voltage and of an adjusting voltage. The output voltage is proportional to the adjusting voltage. This can be derived from the output voltage by means of a feedback coupling.

Abstract: A source of alternating current in a power supply and deflection system of a television receiver is coupled to a primary winding of a transformer, a relatively closely coupled secondary winding of which provides a voltage which may be rectified for providing operating voltage for another portion of the receiver such as the vertical deflection system. Yet another portion of the receiver, such as the audio section, is energized by voltage derived from a winding so disposed around the transformer as to be energized by leakage flux from the transformer for substantially reducing the effects of variations of the audio loading on the deflection systems.

Abstract: A television receiver protection system providing X-ray protection to the viewer responds to rectified horizontal flyback pulses supplied to the gate electrode of a silicon controlled rectifier through a zener diode to trigger the silicon controlled rectifier into conduction when the high voltage level from the flyback transformer of the receiver becomes abnormally high. The silicon controlled rectifier is connected across the power supply for the horizontal oscillator, so that the horizontal oscillator is rendered inoperative when the silicon controlled rectifier becomes conductive.

Abstract: A high voltage transformer winding assembly is disclosed which enables tuning to preferably provide a rectangular pulse output for improving voltage regulation. The winding assembly comprises a pair of winding subassemblies mounted on opposite legs of a magnetic core. Each winding subassembly is provided with a plurality of windings. The plurality of windings of the two subassemblies are interconnected to form a plurality of winding pairs. The interconnection is such as to form an a-c null or minimal a-c voltage substantially at the connection point between the windings making up a winding pair. When the start turns of the windings are interconnected to form the winding pairs the a-c null of each winding pair appears adjacent the core to reduce the likelihood of corona discharge. The plurality of winding pairs are connected in d-c series aiding by means of diodes which provide a-c isolation between the winding pairs.

Abstract: Apparatus for detecting an error condition in a deflection circuit of a cathode ray tube, the deflection circuit being of the type wherein a periodic retrace signal is generated, including a filter coupled to the retrace signal generator and normally non-responsive to the retrace signal. In the event of an error condition, the retrace signal is provided with higher frequency components which are transmitted by the filter. An output signal generator is coupled to the filter to produce an output signal in response to the signal components transmitted by the filter. In one embodiment, the deflection circuit is the horizontal deflection circuit of a CRT wherein the retrace signal is used to produce the high voltage for the CRT. In this embodiment, the output signal is used to vary the repetition frequency of the horizontal oscillating signal applied to the deflection circuit so as to correspondingly change the amplitude of the retrace signal and, thus, to reduce the magnitude of the high voltage.

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.