Abstract: A horizontal deflection circuit drives a voltage generator by way of a first transformer, and also drives a switched synchronous vertical deflection circuit. In order to reduce variations of the energy coupled from the horizontal deflection circuit to the vertical deflection circuit attributable to variation of the load coupled to the voltage generator, the horizontal deflection circuit is coupled to the vertical deflection circuit by second transformer means separate from the first.

Abstract: A horizontal deflection output circuit free of a damper diode includes a horizontal output transistor, between collector and emitter of which a series circuit of a horizontal deflection coil and S-distortion compensation capacitor and a resonance capacitor are connected, and a pulsating switching signal is supplied between the base and emitter of the transistor through an inductive coupling so that the transistor is switched on and off by the pulsating switching signal. An excitation circuit of the horizontal output circuit comprises an excitation transformer having a secondary winding thereof connected to the base-emitter circuit of the output transistor and an excitation transistor connected to a primary winding of the excitation transformer.

Abstract: A circuit for generating a saw tooth waveform in a coil such as the deflection coil of a television picture tube, comprising a first circuit branch including a capacitor serving as an energy storing current source and a controllable rectifier, and a second circuit branch including another current source, a second controllable rectifier and a resonant circuit comprising two reactances, constituted by an inductance and a capacitor which are connected in circuit by the second controllable rectifier and act to draw current from the two sources away from the deflection coil when the second controllable rectifier is fired whereby to initiate the flyback portion of the saw tooth waveform.

Abstract: A deflection circuit for a television receiver comprises a deflection winding coupled to commutating and trace switches. A reactive circuit including a capacitor is coupled between the switches. A transient voltage damping circuit is coupled across the commutating switch. The damping circuit includes a transformer comprising a primary winding to which the transient voltages are coupled and a secondary winding coupled to an auxiliary load circuit.

Abstract: A line deflection circuit in a television display apparatus. Between the parallel diode and the chassis there is a series arrangement of a first winding and a capacitor, a second winding being included between the switch and the voltage supply source. A diode is connected to a point of the first and to a point of the second winding and conducts in the retrace period of the deflection current. By adjusting the conduction time of the switch a trace voltage can be obtained which exceeds the supply voltage so that the circuit is suitable for battery supply.

Abstract: In a switched vertical deflection circuit, two SCR switches couple horizontal retrace pulses to a capacitor. A modulator couples pulse width modulated gating pulses to the SCR's. The SCR's couple to the capacitor successively smaller portions of the horizontal retrace pulses during a first part of the vertical trace interval and successively larger portions during a second part for developing in a vertical deflection winding a sawtooth vertical deflection current. The modulator couples gating pulses to one of the SCR's during the vertical retrace interval for substantially loading the horizontal deflection circuit during the vertical retrace interval for preventing undesired oscillations within the horizontal deflection circuit.

Abstract: A side pincushion correction circuit having an impedance circuit in series with the deflection coil. A controlled switch coupled in a branch of the impedance circuit is operated at times during the second half of the horizontal retrace interval which are progressively advanced during the first half of vertical interval and retarded during second half of vertical interval. Enhanced inside pincushion distortion correction is provided when the impedance circuit includes a capacitor coupled in series with the switch.

Abstract: A modulator stage of a switched vertical deflection amplifier produces pulse width modulated gating signals obtained by modulating horizontal rate pulses including a ramp portion at a vertical deflection rate. The gating signals control switches coupled between a source of horizontal retrace pulses and a capacitor for charging the capacitor with decreasing and increasing amounts of energy during respective first and second intervals during each vertical trace interval for producing a sawtooth current in a vertical deflection winding coupled to the capacitor. A generator adds a nonlinear component to the ramp portions of the horizontal rate pulses for altering the gain of the amplifier during the vertical trace interval for producing a scanning current with a desired degree of linearity.

Abstract: A supply circuit for television receivers in which power source isolation is effected via a backward transformer. For the sake of achieving an insusceptibility to interferences, the operating frequency is equal to the line frequency. According to the invention, the supplied energy is controlled by varying the switch-on time during one period of the line frequency, in that the disconnecting time position is changed with the aid of a thyristor switching stage.

Abstract: A vertical-sweep generator for a deflection yoke of a cathode-ray tube in a television receiver comprises a monolithic integrated semiconductor chip including transistors and resistors defining, together with external circuit elements, a free-running multivibrator (O, O.sub.1), an associated synchronizing circuit (O.sub.2), and a ramp-current generator (RC, RC.sub.1) controlled by the multivibrator in order to regulate the yoke current by way of a power amplifier (PA) and a flyback circuit (FG).

Abstract: First and second controllable switching stages are respectively coupled between a source of horizontal retrace pulses and a capacitor connected across a vertical deflection winding. A modulator is coupled to the switching stages for controlling the timing of conduction thereof relative to the timing of the horizontal retrace pulses. One switching stage charges the capacitor in one polarity with pulses of current of gradually decreasing amplitude and duration during a first portion of the vertical trace interval and the other switching stage charges the capacitor in the opposite polarity with pulses of current of gradually increasing amplitude and duration during a second portion of the vertical trace interval. The capacitor supplies scanning current of first and second polarities to the vertical deflection winding during respective first and second portions of each vertical trace interval.

Abstract: A protection circuit for a television receiver which disables the television receiver by disabling the horizontal deflection circuit in response to fault conditions is shown. The protection circuit detects excessive current drain by a low voltage supply, excessive current drain by a high voltage supply, and excessive high voltage. In response to any one of these fault conditions, the horizontal deflection circuit is disabled.

Abstract: In a vertical deflection circuit in which a capacitor in parallel with a pair of vertical deflection coils is charged by respective decreasing and increasing amounts of horizontal rate energy during respective first and second portions of a vertical scan interval for providing a substantially linear vertical sawtooth current through the vertical coils, a resonant circuit tuned to approximately the horizontal rate is coupled in parallel with the capacitor and a portion thereof is serially coupled with the vertical coils for providing a horizontal rate current component of such a phase in the vertical coils as to correct for top and bottom pincushion distortion.

Abstract: A centering circuit comprising a non-symmetrical conduction network and an integrating inductor in series combination is coupled to a deflection system between the junction of the S-shaping capacitor and the deflection windings and the junction of a winding of the high voltage transformer and its associated coupling capacitor, these junction points providing a relatively small but adequate voltage difference to energize the centering circuit with minimum deflection system power dissipation. The non-symmetrical conduction network comprises two oppositely poled diodes and a potentiometer. The adjustment of the potentiometer provides for a change of the magnitude and polarity of the average current flowing through the deflection winding during the trace interval.

Abstract: First pulses timed for enabling conduction of a first switch in a two-switch deflection system are delayed and combined with retrace pulses obtained from the system for forming second pulses suitably timed for enabling conduction of the second switch.

Abstract: A thyristor gate drive circuit includes a unidirectional current conducting device coupled to charge a capacitor with single polarity signals. The discharge of the capacitor is controlled so that polarity changes in the drive waveform do not effect the polarity of the drive signal coupled to the gate.

Abstract: In a television receiver including a line frequency switched supply voltage circuit and a line deflection circuit in which a first loop is constituted by a winding of the voltage circuit, a winding of the second circuit, a capacitor and a diode. A second loop comprises the control means of the line deflection switch and windings coupled to the above-mentioned windings.

Abstract: A supply voltage arrangement in a television receiver, which arrangement is switched at line frequency. The diode of the arrangement is shunted by the series combination of a capacitor and a primary winding of a transformer, a secondary of which controls the switch in the line deflection circuit.

Abstract: In a cathode ray tube display system having a horizontal deflection circuit which includes a horizontal deflection yoke and an "S" curve correction charge storage means, a dynamic damper circuit shunts the "S" correction charge storage means and includes a series connected charge storage means and a unidirectional conduction device shunted by an impedance whereby the dynamic damper circuit compensates for variations in potential at the "S" curve correction charge storage means due to intermittent load changes.

Abstract: A voltage regulator for a thyristor deflection system of the commutating network type includes a reverse current control network which couples a source of direct current to the commutating network. The reverse current control network includes a diode which provides for energy transfer from the source of direct current to the commutating network during a first portion of the energy storage interval and a silicon controlled rectifier (SCR) which provides for energy transfer from the commutating network to the source of direct current during a second portion of the energy storage interval after the SCR is enabled. A resistor coupled between the gate and anode electrodes of the SCR provides a gate current for enabling the conduction of the SCR.

Abstract: A horizontal deflection circuit arrangement in which a saturable reactor operating as a variable impedance element is provided in the path of a horizontal deflection current flowing through a horizontal deflection coil for stabilizing the horizontal deflection current against fluctuations of the frequency of a horizontal drive signal for a horizontal output switching device, thereby to keep a suitable horizontal size of a raster made by the beam scan caused by the deflection current. The saturable reactor is supplied with a control signal varying in response to variations in the frequency of the horizontal drive signal to control the impedance thereof so as to compensate for the variations of the horizontal deflection current.

Abstract: An amplifier circuit for amplifying a repetitive alternating signal, the amplifier circuit having a voltage feedback loop which includes a sampling circuit. The sampling circuit is arranged to sample the output voltage of the amplifier at a given time during each cycle of the alternating signal and to store the sampled voltage for the remainder of the cycle. This stored voltage is used as a feedback signal for the amplifier. Since the output is sampled at the same time during each cycle of the alternating signal the filter circuit in the feedback loop may be omitted and the phase shift introduced by the feedback loop may be arranged to be constant with varying frequencies. When used in a field deflection circuit for television display apparatus the deflection waveform is preferably sampled during the flyback period.

Abstract: A drive circuit for a gated semiconductor device includes a switching device which provides first and second conduction states. The switching device is coupled to a source of direct current potential by means of a first inductor and coupled to the gate of the gated semiconductor device by means of a capacitor. A second inductor is coupled to the gate of the gated semiconductor device. Negative current is produced in the gate of the gated semiconductor device and energy is stored in first and second inductors during the first conduction state of the switching device. Positive current is produced in the gate of the gated semiconductor device during the second conduction state. The first and second inductors provide for enhancement of the positive gate current and also charging of the capacitor during the second conduction state.

Abstract: A horizontal deflection system with a transformer coupled driver including separate turn-on and turn-off drivers coupled to first and second input windings of the driver transformer is shown. The output winding of the driver transformer is loosely coupled to the first input winding to provide a sawtooth drive current to the horizontal output transistor sufficient to maintain the horizontal output transistor in saturation without wasting excessive power. The output winding is tightly coupled to the second input winding to provide a sharp turn-off pulse to the horizontal output transistor.

Abstract: This TV receiver power supply is of the type wherein power to operate the audio output stage is taken from the horizontal output deflection circuit. To prevent interaction on the high voltage supply when high audio output levels are reached, the invention provides a compensating circuit arrangement which prevents any lowering of the high voltage during high audio peaks. This prevents noticeable changes in the TV picture width during audio peaks.

Abstract: A horizontal deflection system with a transformer coupled driver including separate trace and retrace drivers coupled to an input winding or windings of the driver transformer is shown. A feedback or pulse forming means is connected from the transformer to the input of the retrace driver for providing a pulse to the retrace driver in response to termination of the trace drive signal by the trace driver.

Abstract: A circuit is a combination of a switched mode power supply and a TV deflection circuit. It features a pair of switches and a pair of inductors that are tuned to selected frequencies so that when the switches are off, the inductor voltages have a half sine wave shape.

Abstract: A gating circuit for a deflection system which includes a first switch which is coupled to a deflection winding for supplying energy to the deflection winding during a trace interval of each deflection cycle. A commutating network including a second switch is coupled to the deflection winding and supplies energy to the deflection winding during a commutating interval of each deflection cycle. A coupling network couples a first polarity portion of gating signals developed by the commutating network to the first switch during the trace interval to enable conduction of the first switch. The coupling network also provides a second polarity portion of the gating signals to the first switch during the commutating interval to enable the turn off of the first switch.

Abstract: Cascaded multipliers are coupled to a source providing a periodic sawtooth deflection waveform, the amplitude of which varies with variations in the high voltage applied to an accelerating anode of a kinescope. The sawtooth signal is cubed by the cascaded multipliers and multiplied by the inverse square of a voltage which varies with changes in the kinescope anode potential. The system thus incorporates S-correction and means for correcting the deflection waveform to compensate for changes in the high voltage supplied to the kinescope anode.

Abstract: A self-regulating horizontal deflection system with feedback indicative of the magnitude of an unregulated voltage source and of load variations to pulse width modulate the output of the horizontal oscillator is shown. Separate turn-on and turn-off drivers are transformer coupled by separate primary windings to the horizontal output transistor to optimize the driver stage and conserve power.

Abstract: A deflection circuit for a television receiver is made more suitable for single chip integrated circuit construction by utilizing a switching means connected between a part of the transistor amplifier used to amplify a saw-tooth wave form and a power source. This permits a part of the energy stored in the deflection coil to be released through the amplifier during retrace intervals.

Abstract: Horizontal deflection circuitry for a television receiver employing a toroidal yoke which has balanced drive windings for reducing the voltage to ground of the yoke's horizontal deflection windings, whereby in accordance with one aspect of the invention the horizontal deflection circuit is configured to permit a ground connection for principal components thereof and to provide a relatively low loss operation, and in accordance with a further aspect of the invention unique circuit configurations are provided to permit a simple connection of the horizontal deflection circuit to a horizontal centering network for supplying a dc centering current component to the horizontal deflection current.

Abstract: A vertical deflection circuit including a Miller integrator and a Schmitt trigger circuit in combination to obtain a sawtooth wave signal at an output terminal of the Miller integrator circuit and a vertical deflection coil connected to the output terminal of the Miller integrator circuit to be supplied with the sawtooth wave signal therefrom in which the Schmitt trigger circuit is controlled by a vertical pulse signal for synchronization and the Miller integrator circuit is preferably controlled by a parabolic wave signal of the vertical scanning rate in order to compensate for or correct the non-linearity in the vertical deflection. The circuit configuration is well suited for being formed as an integrated circuit on a single semiconductor substrate.

Abstract: Circuit arrangement for combined line deflection and supply voltage stabilisation. The switched-mode transformer is connected via the secondary diode to a tapping on a winding coupled with the high-voltage winding. As a result, the maximum collector voltage is reduced and a greater range of supply voltage variations can be accommodated. All the windings may be wound on the same core.

Abstract: In a television deflection system employing a first SCR for coupling a deflection winding across a source of energy during a trace interval of each deflection cycle and a second SCR for replenishing energy to the source of energy during a commutation interval of each deflection cycle, a gating circuit for triggering the first SCR. The gating circuit employs a voltage divider coupled in parallel with the second SCR which develops gating signals proportional to the voltage across the second SCR.

Abstract: A closed loop controlled amplifier operable on low power is disclosed. The amplifier utilizes a relatively slow, high voltage transistor that is saturated during the active sweep and cut off during the retrace. A dampening network is included which operates during the active horizontal deflection time. A current feedback is derived from the horizontal deflection yoke to stabilize and control the amplifier.

Abstract: An improved sweep generator circuit suitable for deflection circuits in television receivers conventionally includes a condenser chargeable through a resistance to establish the sweep. A resistive voltage divider and a threshold comparator circuit are each arranged parallel to the condenser. The comparator circuit is triggerable to establish a low impedance discharge path across the condenser when the charging voltage across the condenser exceeds a normal reference voltage from the voltage divider. The frequency of the generator is made variable in response to a synchronization frequency within predetermined limits by shunting a resistance of the voltage divider by a control resistance through an electronic switch that is triggerable by the sync pulse train.

Abstract: A horizontal deflection system is operable either from rectified and filtered alternating current line voltage or from a substantially lower voltage direct current voltage source. The need for a step-down transformer in the receiver power supply is eliminated by utilizing the horizontal output transformer to drop the rectified and filtered alternating current voltage when the receiver is operated in the alternating current line mode. The horizontal output transformer is utilized as a step-up inverter when the receiver is operated from the low voltage direct current source to produce a direct current voltage at a point on the horizontal output transformer substantially equal to the rectified and filtered alternating current line voltage.

Abstract: A start-up circuit for a deflection system comprises a deflection circuit including a first oscillator which produces a first signal for producing a deflection signal in a deflection winding in response to the first signal. A second oscillator coupled to the first oscillator controls the frequency and phase of the first oscillator when a direct current potential is coupled to said second oscillator. A rectifying circuit coupled to the deflection circuit and the second oscillator provides the direct current potential to the second oscillator when the deflection signal is being produced.

Abstract: A field deflection output circuit in which the deflector coil is divided in two halves which are connected between the terminals of a direct-voltage source, in series during the trace interval and in parallel in the retrace interval. As a result the retrace interval may be given the correct duration whilst dissipation is kept low so as to enable the circuit arrangement to be integrated in a semiconductor body.

Abstract: The current flowing through the horizontal deflection coil of a cathod ray tube is controlled by a transistor which is switched between saturation and cut off by a circuit having a pulse generator for generating a pulse in response to a horizontal synchronizing pulse. The leading edge of the generated pulse is delayed before being applied to the controlling transistor which switches sometime thereafter due to the storage time of the transistor. To insure that the blanking of the electron beam of the tube takes place during the retrace time, the blanking interval is set to occur a period of time after the horizontal synchronizing signal which is less than the sum of the storage time of the transistor and the time which the leading edge of the generated pulse is delayed.