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: An SCR is one controllable switch thyristor in an SSVD circuit and the other is a triac. One electrode of each thyristor is grounded, and the gates of the thyristors are driven from the SSVD control circuit by pulse voltages relative to ground.

Abstract: In a horizontal deflection output circuit in which a horizontal output transistor, a damper diode and a resonance capacitor are respectively connected in series with a horizontal deflection coil, a series circuit of a resistor and a capacitor is connected with the damper diode and a second diode is connected with the resistor. The time constant of the series circuit is so chosen that the second diode starts conducting current at the beginning of the horizontal scanning period, and therefore the horizontal deflection current flows through the second diode at the beginning of the horizontal scanning period so that the linearity of the horizontal deflection current can be prevented from degrading immediately after the beginning of the horizontal scanning period.

Abstract: A television synchronous switched vertical deflection circuit couples energy from horizontal deflection circuit to a vertical deflection winding by means of a pair of controllable switches to form the vertical deflection current. One switch of the pair couples energy during the horizontal retrace interval and the other couples energy during the horizontal trace interval.

Abstract: Disclosed is an SCR-analogue, dual coupled transistor vertical oscillator for synching the vertical sweep in a video display with vertical synchronization input signals. Capable of stable, free-running oscillation at two, variable DC levels, the coupled transistor configuration in combination with a capacitor generates a precisely defined sawtooth voltage waveform for controlling vertical sweep and flyback. This combination provides an inexpensive, flexible means for synchronizing sweep drive circuitry operating at various DC coupled levels with a wide range of synchronization input signals.

Abstract: A source of unregulated direct voltage has a terminal coupled to a capacitor. A horizontal deflection circuit is coupled to a first terminal of the source and to the capacitor so as to be energized by a regulated voltage established by the difference between the unregulated voltage and the voltage across the capacitor. The deflection switching transistor is serially coupled with an additional controllable switch, and an inducator is coupled between the junction of the switches and the second terminal of the source of unregulated direct voltage to provide a controllable path for current flow in the capacitor. The controllable switches are operated at the deflection rate to generate deflection currents and to control the state of charge of the capacitor to maintain a constant regulated voltage. The energy represented by periodic discharge of the capacitor is recovered.

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: An amplifier includes first and second switches coupled at a junction to form a series circuit. The series circuit is serially coupled with an inductor across a source of energizing potential. A capacitor couples the junction between the switches to a load. The switches conduct alternately under the control of a duty cycle modulator. The duty cycle modulation tends to vary the amplitude of the two opposite-polarity portions of the signal appearing across the load. A clamp is coupled to the junction of the series switch circuit and the inductor. The clamp operates during a first of the two alternate switch conduction intervals to clamp the voltage across the inductor at a fixed value. Since a direct voltage cannot be established across an inductor, the voltage across the inductor during the second switch conduction interval is established by the clamp voltage and the duty cycle, and varies with duty cycle.

Abstract: A sweep generator circuit for use with a cathode ray oscilloscope. It provides for a high duty-cycle by eliminating the discharge and recovery time of a conventional sweep generator circuit. This is accomplished by alternately charging and discharging the timing capacitor at equal rates, forming linear up and down ramp signals. Then, by amplifying the ramp signals along with synchronously reversing the polarity of the amplified down ramp signals, using electronic switching, identical unidirectional sweeps are produced during both charging and discharging times of the timing capacitor.

Abstract: A side pincushion distortion correction circuit has an impedance circuit connected in series with the deflection coil in a television receiver. A controllable switch connected in parallel with the impedance circuit is operated by a switching signal, the phase of which is modulated by a combination of a parabolic signal at the vertical rate and a control signal corresponding to the brightness of a reproduced picture on the screen of the television receiver in order to maintain proper correction of side pincushion distortion despite variations in the brightness of a picture reproduced on the cathode ray tube of the television receiver.

Abstract: A circuit arrangement for driving saw-tooth current through a coil comprising a trace capacitor and a retrace capacitor, connected in a closed loop with said coil, a current recovery diode connected in parallel with the said retrace condenser, a first controllable switch, having a control electrode operative to receive periodic control signals to render the said first switch conductive during part of the trace interval, and an inductance connecting the said first switch to a power supply source in which energy is stored during the interval in which the said first switch is conductive and from which energy is supplied to the said first retrace capacitor by way of a second diode and a third capacitor when the said first switch is not conductive, the energy stored in the said third capacitor when the said first switch is not conductive, being restored to the supply source when the said first switch is conductive by way of a second controllable switch.

Abstract: A horizontal deflection winding forms a resonant retrace circuit with two series coupled retrace capacitors during a retrace interval. A controllable circuit in shunt with the second capacitor bypasses a controlled amount of retrace current from that capacitor thereby controlling the retrace pulse width. East-west raster correction, width control and pulse amplitude control are possible depending on the variables selected for control.

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: A sawtooth wave generated in a sawtooth wave generator circuit of a vertical deflection circuit assumes a predetermined maximum voltage at the start of a vertical scan and a minimum voltage which changes depending on a vertical cycle period at the end of the vertical scan. A pulse generator generates a sampling pulse at the end of the vertical scan so that the sawtooth wave voltage at the end of the vertical scan is sampled by the sampling pulse. The sampled sawtooth wave is held until a next sampling pulse is generated so that a D.C. voltage which changes in accordance with the vertical cycle period is produced. The sawtooth wave voltage is level-shifted by a level shifting circuit and thereafter amplified before it is supplied to a vertical deflection coil. The amount of shift by the level shifting circuit is controlled by the D.C. voltage so that the sawtooth wave having a stabilized D.C. component is amplified. Accordingly, a vertical deflection circuit free from D.C.

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: In a circuit for controlling the current flow through a coil, such as, the horizontal deflection coil of a television receiver, a first switching circuit including a first switching transistor and a first damper diode is connected in parallel with a first resonant circuit including a first capacitor and a first coil which is the coil through which the current flow is to be controlled, a second switching circuit including a second switching transistor and a second damper diode is connected in parallel with a second resonant circuit including a second capacitor and a second coil, a charging capacitor is connected in a common current path for the first and second resonant circuits, and switching signals of the same frequency, for example, the horizontal frequency of a video signal, are applied to the first and second switching transistors with the phase difference between such signals being controlled to vary the voltage across the charging capacitor and hence the current flowing through the first coil.

Abstract: To protect the horizontal deflection circuit against reverse polarity high-voltage pulses derived from an inductance, which is provided to rapidly drain stored charge carriers of an output transistor thereof, a protective circuit is connected between the driver stage and the base of the output transistor which includes a transistor controlled by the driver stage, for example by a reverse polarity signal which renders the parallel connected transistor conductive, thereby short-circuiting the reverse polarity pulse with respect to the driver stage and protecting the driver stage thereagainst.

Abstract: A circuit for providing saw-tooth current, with a trace and a retrace interval, in a coil, in particular a deflection coil of a television kinescope, in which the coil is connected to a retrace condenser and a trace condenser so as to form a deflection circuit which oscillates freely during the retrace interval, is described. In this circuit, a first diode is connected parallel to the deflection circuit with such polarity as to be made conductive by the saw-tooth current during the first part of the trace interval, and the said deflection circuit is also connected parallel, by means of a second diode having such polarity as to be made conductive by the saw-tooth current during a second part of the trace interval, to a controllable switch, which is made conductive during part of the trace interval.

Abstract: A trace current is generated in a horizontal deflection winding upon closure of a trace switch. A retrace capacitor forms a resonant retrace circuit with the deflection winding upon open-circuiting of the trace switch. A second resonant circuit is coupled to an energy supply and stores energy when the trace switch is closed. A second switch couples the resonant retrace circuit to the second resonant circuit during retrace. The stored energy in the second resonant circuit is then transferred to the resonant retrace circuit and to other load circuits, such as a flyback transformer.

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 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 television vertical deflection circuit is disclosed. A sawtooth generator is connected to a driver circuit and this circuit is in turn connected through a capacitor to an output amplifier, which powers vertical deflection coils of a television receiver. A first voltage source is connected through a forward diode to the output amplifier. A second voltage source is connected through switching means to the output amplifier. A signal from the driver circuit to the base of a transistor of switching means shuts the first voltage source off and turns the second voltage source on.

Abstract: A line deflection current generator and a diode modulator for influencing the amplitude of the generated deflection current but without influencing the d.c. voltages which are also generated by the generator, a controllable switching device, for example, the series arrangement of a coil and a thyristor being included in parallel with one of the diodes of the diode modulator and with the opposite direction of conduction. This controllable switching device can also serve as control element for the amplitude modulation.

Abstract: A driver circuit (68) for a CRT magnetic deflection yoke (80) includes a current switching transistor (88) connected across a deflection voltage source (84) in series with the deflection yoke (80). The transistor switch (88) is periodically switched "on" and "off" to generate the proper current waveform in the deflection yoke. A clamping circuit (74) including several clamping diodes (90, 92) prevents the voltage across the current switching transistor (88) from dropping below a limiting voltage level. The transistor is thus held out of saturation. When the current switch is "on", a differential amplifier (78) controls base drive to the transistor (88) in accordance with the voltage drop across the clamping diodes (90, 92) in order to maintain the current through the clamping diodes (90, 92) at a low, substantially fixed level, independently of variations in deflection yoke current. Speed of operation is thus enhanced by reducing charge storage effects in the clamping diodes (90, 92).

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 drive circuit for a television deflection output transistor includes a drive transformer, the secondary winding of which is coupled across the base-emitter junction of the output transistor. A first end of the primary winding of the drive transformer is coupled to a driver transistor which is switched at the deflection rate. The second end of the primary winding is coupled to a first capacitor charged through a first charging resistance from a first voltage source, the magnitude of which is determined by the charge storage in the base region of the output transistor, and its current gain. The second end of the primary winding is also coupled through a diode to a second capacitor charged through a second resistor from a second voltage source. The magnitude of the second voltage source is selected at a value significantly lower than that of the first voltage source, which value is established based upon considerations of the forward base-emitter drive current required by the output transistor.

Abstract: The invention relates to a vertical deflection circuit used in television receivers. U.S. Pat. No. 4,048,544 proposes to derive the vertical deflection voltage by feeding the vertical deflection coil with decreasing portions of the horizontal retrace pulse during the first picture half, and with oppositely directed portions increasing from zero during the second picture half. That method involves very short pulse times and, thus, high voltages and currents to generate the desired deflection power. Therefore, fast thyristors with high blocking voltages must be used. According to the invention, the pulses are taken from the horizontal sweep. Thus, they can be longer and, consequently, smaller even at small currents, and complementary transistors can be used as switching means.

Abstract: A circuit arrangement for providing a saw-tooth current, with trace and retrace (flyback) intervals, in a deflection coil, in which the amplitude of said current is affected by modulation signal, the arrangement comprising in addition to the said deflection coil, a first retrace capacitor and a first trace capacitor which, together with the deflection coil, form a first oscillating circuit during the retrace interval, a second inductance coil, a second retrace capacitor and a second trace capacitor which form a second oscillating circuit during the retrace interval, a controllable switch connected to a power supply source through a third inductance coil and having a control electrode, connected to a periodic signal source for making the controllable switch conductive during a second part of the trace interval, and a first diode and a second diode, connected in parallel with the first and second retrace capacitors, respectively, the polarity of the diodes being such that they are made conductive by current flo

Abstract: A side pincushion correction circuit is coupled to a horizontal resonant retrace circuit which includes a retrace capacitor and a horizontal deflection winding. The correction circuit includes an inductance and a controllable switch which is turned on during each horizontal retrace interval. A compensating circuit comprising secondary winding of a flyback transformer is coupled to the inductance and reflects the inductance onto the primary winding side in series with the deflection winding when the switch is open circuited and reflects the inductance in parallel with the deflection winding when the switch is conducting. The on-off ratio of the switch during horizontal retrace is modulated at a vertical parabolic rate to achieve side pincushion correction. The turns ratio of the flyback transformer is selected to adjust the resonant frequency and the retrace time modulation created by the correction circuit.

Abstract: The invention is concerned with a circuit arrangement for driving a saw-tooth current in a coil primarily intended for use as a line output stage for a television receiver. The circuit arrangement comprises a parallel resonant circuit which incorporates a line deflection coil, a diode connected in parallel with the coil to conduct the deflection current during a first portion of each operating cycle, a second diode and a thyristor connected in series with one another in parallel with the coil, the thyristor being fired by pilot pulses to conduct the deflection current in a second portion of each cycle immediately following the first portion, a series resonant circuit including a capacitor connected in parallel with a thyristor for quenching the thyristor at the end of the second portion of each cycle and a third diode connected in series with the capacitor in a circuit branch connected in parallel with the second diode and serving to transfer energy from the series resonant to the parallel resonant circuit.

Abstract: A controllable switch is coupled to a source of unregulated direct voltage and in a closed loop with a filter inductor and a storage capacitor and has its on-off state controlled at the horizontal deflection rate to control the voltage across the capacitor and regulate a voltage. A diode is coupled with the filter inductor and storage capacitor to form a second series circuit through which current can continue to flow in the inductor when the controllable switch is opened. The controllable switch is opened abruptly by application of a reverse biasing flyback pulse to its main current conducting path. The flow of current in the filter inductor is smoothed and may extend over the entire horizontal cycle.

Abstract: A circuit for providing saw-tooth current with a trace and retrace interval in a coil, in particular a deflection coil of a television kinescope, in which the coil is connected to a trace and retrace condenser with which it forms a resonant circuit, is described. In this circuit, a first diode is connected in parallel to the resonant circuit with such polarity that it is made conductive by the saw-tooth current during the first part of the trace interval, and the resonant circuit is also connected, through a second diode, to a controllable switch, which is made conductive at least during that last part of the trace interval, the second diode being connected with such polarity that it is made conductive by the saw-tooth current during the last part of the trace interval.

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: A line output stage comprising a first parallel resonant circuit including a horizontal deflection coil and a capacitor, one side of the first resonant circuit being connected to ground and the other side of the first resonant circuit being returned to ground by way of a first diode and a controllable semi-conductor switch, a second diode connected in parallel with the first resonant circuit, a second parallel resonant circuit comprising a second coil having one side connected to a DC power supply terminal and the other side returned to ground by way of the controllable semi-conductor switch, means for applying periodic pilot pulses to the controllable semi-conductor switch and an energy transfer circuit inductively or capacitatively coupled to the said second parallel resonant circuit for transferring energy during each cycle from the second parallel resonant circuit to the first parallel resonant circuit, the said energy transfer circuit including a third diode and means for modulating the power transferred

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: A self-regulating deflection circuit includes a first inductor and switching transistor coupled across the unregulated voltage supply. A damper diode, retrace capacitor and second inductor are coupled in parallel, and the parallel combination is coupled across the transistor by a first rectifier poled to prevent current from flowing from the first inductor to the second inductor. A second rectifier is coupled between the first and second inductors for transferring energy from the first inductor to the second during the retrace interval. A control circuit coupled to the second inductor and to the base of the switching transistor controls the time during the first half of the trace interval during which the transistor conducts to allow energy to be stored in the first inductor. A storage capacitor is coupled in series with the second rectifier. Charge accumulation on the storage capacitor and resultant blocking of the second rectifier is prevented by a resistor coupled across the storage capacitor.

Abstract: An improvement in a television receiver circuit for producing rapid discharge of the capacitors of the primary d.c. power supply upon turn-off of the receiver. The disclosed improvement eliminates the need for conventionally used bleeder resistors by the addition of a direct coupling means to existing horizontal sweep circuitry to derive a current which switches the horizontal driver transistor to continuous conduction upon turn-off of the receiver, thereby rapidly discharging the capacitors of the main power supply.

Abstract: A controllable switch is coupled to a source of energy and a first terminal of a deflection circuit. A second switch is coupled in parallel with the first switch. The controllable switch is poled to conduct forward operating current, while the second switch is poled to conduct return current to the source. A control circuit controls the duration of conduction of the controllable switch for providing a controlled amount of energy to the deflection circuit. The deflection rate voltage at the first terminal commutates off the controllable switch; the second switch then conducts the return current.

Abstract: A circuit for providing a saw-tooth current in a coil is described. The circuit comprises a trace condenser and a retrace condenser which form together with the coil a resonant circuit during the retrace interval, a diode connected parallel to the retrace condenser, a controllable switch connected to a supply source through an inductor and to the retrace condenser through a second diode.The main feature of this circuit is to comprise a condenser connected on one hand towards the controllable switch and the first inductor and, on the other hand, to a circuit comprising a second inductor and, through a third diode, towards the retrace condenser. The condenser and the two inductors are sized in such a manner that when the controllable switch is not conductive, energy is supplied to the condenser and that successively, when the controllable switch is conductive, the condenser is completely discharged through the second inductor. The energy thus stored in the second inductor is then supplied to a storage device.

Abstract: The application relates to a thyristor-controlled horizontal deflection circuit of a television receiver with mains isolation. Input inductor, communtating inductor, and isolation transformer are united in one component. In the transformer used for this component, the open-circuit inductance performs the function of the input inductor of a conventional thyristor horizontal deflection circuit, and the short-circuit inductance that of the commutating inductor.

Abstract: A circuit for generating a saw-tooth current waveform in a coil comprises a parallel resonant circuit, of which the coil in which the saw-tooth current is to be generated forms part. The parallel resonant circuit includes two capacitors in parallel and a first diode, in parallel with one of the capacitors, and in parallel with which is a switching transistor connected via a second diode to the cathode of the first diode. Input energy from a power source is fed to the junction between the second diode and the switching transistor via an inductance which forms a resonant circuit with a further capacitor forming at least part of a reactance in parallel with the second diode.

Abstract: A switched television pincushion correction circuit uses a controllable switch including an SCR gated at the horizontal deflection rate. The gating signal is a horizontal rate pulse which is duration-modulated at the vertical rate. A gating pulse generator includes a source of rectified mutually inverted vertical sawtooth signals. An offsetting circuit generates from the rectified signals two vertical rate signals offset from each other by a fixed amount. The offset signals are summed and the sum signal is used to modulate a horizontal-rate ramp-on-pedestal signal in order to generate the duration modulated SCR gating signal.

Abstract: A saw-tooth wave generator including thyristors is provided in the vertical deflection circuit, the thyristors controlling charging and re-charging of a charge capacitor. A portion of the energy contained in the line retrace and delivered from the horizontal output stage is used in order to provide current for the vertical deflection coil. In order to prevent spurious or erroneous operation of the thyristors, an oppositely poled bias voltage is applied to the gates of the thyristors during the pauses or intervals of triggering of the thyristors, the bias voltage being derived externally or directly from the thyristor control circuit, for example by utilizing the inductive reverse-polarity kick of an inductance connecting the thyristor gate to its control circuit, by a charge-reverse re-charge circuit of a capacitor, or the like.

Abstract: A side pincushion correction circuit includes an impedance circuit coupled in series with the horizontal deflection coil. A switch coupled across at least a part of the impedance circuit is closed at a time during the retrace interval which is progressively advanced during a first portion of the horizontal retrace interval and progressively retarded during a second portion. Damping of the impedance circuit is provided by a second switch operated at a rate synchronous with the first. The second switch is coupled between a point of the impedance circuit and a voltage source.

Abstract: A circuit arrangement for obtaining a periodic sawtooth current in a coil, particularly in a deflection coil of a kinescope, is described. The circuit arrangement comprises a first, unidirectional conductivity device, disposed in parallel to a circuit branch comprising the deflection coil, and a second, controllable switching device, having a control electrode connected to a source of periodic pulses which render conductive the second device during a part of the period of the sawtooth. The main feature of the circuit arrangement is to comprise a resonant series circuit disposed in parallel to the second device; the second device and the resonant series circuit are connected to the deflection coil and to the first device at least through a third, unidirectional conductivity device.

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, including a capacitor that is charged by the current source by means of the induction coil when the switching device is not conductive, the improvement wherein the capacitor is connected to the primary winding of a transformer, the secondary winding of the latter being connected to the one-way conducting device, and wherein the time during which the switching device conducts and the capacitor discharges are longer than the return time of the saw-tooth cycle.

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.

Abstract: A circuit arrangement which is the combination of a switched supply circuit and a line deflection circuit, the supply transformer being replaced by a coil.