Abstract: A method and apparatus for driving inductive elements, such as deflection coils for a CRT, including a resonant bus, a bus capacitor, and at least two inductive branches grouped in a pair and connected to the bus, each inductive pair including serially-connected one of the inductive elements and a diode means, the diode means in one branch being connected in reverse direction relative to the other diode in the other branch to allow current flow in the one branch to flow from the resonant bus and to allow current flow in the other branch to flow to the resonant bus to produce a sine-squared current in each of the branches inverted with respect to the other and to produce a sinusoidal current in the bus capacitor.

Abstract: A high voltage transformer for a video apparatus provides electrical isolation between the primary and secondary windings. The primary winding is wound on a first bobbin while the secondary windings are wound on a second separate bobbin that surrounds the first bobbin with the bobbin structure providing a physical isolation barrier. The high voltage winding is wound on a high voltage bobbin which fits over the primary and secondary bobbin structure.

Abstract: A transformer coupled amplifier drive circuit (60) and method especially suited for providing a saw-tooth current waveform to an inductive load (32) for horizontal deflection applications in CRT monitors and the like are described. The transformer primary (48) is coupled between the power source connection (11) and the input of the amplifier (26) while the transformer secondary (50) has an opposite polarity terminal coupled to the input of the amplifier (26) through an inductor (52) and the other terminal of the secondary (50) coupled to the common terminal (15) of the amplifier (26) through a diode (56).When the input switch (44) is closed, the input of the amplifier (26) is energized by a current (65) through the series connected primary (48) and energy is stored in the transformer magnetizing field and in the amplifier (26). Conduction in the transformer secondary (50) is blocked by the diode (56).

Abstract: A picture display device for displaying a picture by means of a line raster consisting of a plurality of lines which are successively scanned in the opposite direction includes a video signal processing circuit for receiving an incoming video signal comprising video information and synchronizing signals and for supplying the video information of a line in one direction and the video information of the subsequent line in the opposite direction, and a line deflection circuit for generating a line deflection current through a line deflection coil. To minimize the power which is dissipated in the line deflection circuit, this circuit constitutes a self-oscillating stage with its natural frequency which is determined by a resonant network comprising the line deflection coil and which is independent of the frequency of the line synchronizing signal in the incoming video signal.

Abstract: A coil arrangement with three windings arranged coaxially, where the outer coils are connected in series. The inductances of the outer coils are of equal magnitude and their magnetic fields have opposing polarities.The center winding induces currents in the series circuit of the outer windings which cancel each other out. The outer windings with their stray inductances form a coil which is separated from the center one and can be applied for other purposes.

Abstract: A cathode ray tube electromagnetic deflection unit comprising a support (4) having a flange (8) at its constricted end (5) which has a tangential groove into which radial grooves (14) merge. Two sets of deflection coils (18, 19) are wound on the support (4), the turns thereof running through the radial grooves (14) and the turns of one set bending into the tangential groove. The coils of the coil system 18 are for line deflection, and the two halves thereof are wound in the opposite winding sense and are energized during operation in such a manner that the highest voltage in both coils occurs at the coil turns adjacent plane of separation between the two coils and the lowest voltage occurs at the coil turns most remote from such plane of separation.

Abstract: A system for reversing directions of character displays in a CRT which includes apparatus for generating font signals, disconnecting the supply voltage, reversing the horizontal deflection coil polarity, and reconnecting the supply voltage.

Abstract: An automatic vertical display change circuit for a monitor includes a transistor that is operated in response to a mode signal for determining the amplitude of the vertical ramp produced by the vertical oscillator. The transistor is driven conductive to load the voltage supply means for the oscillator and reduce the operating voltage therefor to decrease the vertical ramp amplitude.

Abstract: An LC tank circuit in the collector of a power transistor controls the vertical modulation of the horizontal deflection of a CRT through additional deflection coils properly oriented. The tank circuit is tuned at a frequency nf for the desired modulation, where n is the number of cycles of oscillation of the tank for each drive pulse at a frequency (pulses per second) f, and each drive pulse is adjusted in width to one fourth or less of a cycle of the modulation frequency nf using an adjustable RC differentiating circuit and a threshold device to couple a squarewave signal at frequency f to the base of the power transistor.

Abstract: Television (TV) scanning with improved resolution is obtained by implementation into a conventional TV scanning arrangement of a vertical drive signal modifying circuit which modifies vertical drive signals prior to their being provided as an input to the conventional TV scanning arrangement. Processing of the vertical drive signals results in the generation of various time delay signals which, when logically combined in accordance with the present invention, result in the generation of modified vertical drive signals. As a result of application of the modified vertical drive signals to the conventional TV scanner arrangement, the number of fields making up the conventional interlace pattern is multiplied by an integral factor greater than one.

Abstract: A horizontal deflection output circuit, such as used in a TV receiver or a display device, includes a series circuit composed of a ringing preventing resistor and a one-way switching element connected in parallel with a linearity correcting coil. That one-way switching element is turned on at the beginning of a horizontal scanning period to feed a current to the ringing preventing resistor but is turned off in the vicinity of a fly-back period to block the flow of the current to the ringing preventing resistor. Thus, the power loss due to the current flowing through the ringing preventing resistor for the fly-back period can be reduced according to the present invention.

Abstract: A line deflection circuit in which a transistor (TR) conducts during the scan period to produce a sawtooth current though the line deflection coil (Ly), transistor (TR) being rendered non-conducting at the scan period to initiate the flyback period which may be required to be short (of the order of 6 microseconds). During flyback the circuit is tuned to produce a half sinewave which determines the flyback period and to an odd harmonic (3rd or 5th) of the fundamental for the flyback period. A change in inductance of the width control inductor (L1) will produce a change in the flyback period while a simultaneous change in the inductance of the inductor (L2) will produce a change in the leakage inductance of the transformer (T) to change the frequency of the desired odd harmonic to ensure that the odd harmonic has the desired relationship with the flyback period. Overcomes display modulation that would otherwise be produced.

Abstract: The output voltage of a variable output voltage power supply is supplied to the deflection system of a raster scanned CRT and is controlled by a frequency responsive control signal generator so as to maintain peak to peak deflection current substantially constant despite scanning frequency variations. Picture width and/or height may be controlled in this way.

Abstract: A picture pick-up or display device, respectively for recording a scene or displaying a scene image, respectively with the aid of a line raster formed by a plurality of horizontal lines which are consecutively scanned in opposite directions. The device comprises a line deflection circuit in which the line deflection coil forms part of a resonant circuit whose tuning frequency is substantially equal to half the line frequency, as a result of which the power dissipation is kept low. By means of a control circuit it is ensured that corresponding points of scanned lines are accurately in line in the vertical direction, the control circuit being arranged for causing a zero-crossing of the line deflection current and a signal which is characteristic of half the video information of a line substantially to coincide. The control circuit comprises an analogue delay element for setting the time position of this signal.

Abstract: A high-speed power amplifier for driving inductive loads is capable of operating at frequencies of at least 270 kHz. The drive amplifier includes an oscillator that develops a continuous square-wave signal having relatively short transition times and a regulated 50% duty cycle. The oscillator output signal is applied to a filar-wound impedance transformer whose response time characteristics do not change substantially the transition time characteristics of the oscillator output signal. The impedance transformer circuit includes a pair of transistors operating in a push-pull configuration simultaneously to maintain the relatively short transition times of the oscillator output signal and to develop the high-current transformer output signal needed to drive a power transistor switch. The power amplifier is designed to provide a base current signal that promotes better dissipation of the power generated in the power transistor as it operates at high switching speeds.

Abstract: In picture-reproducing equipment with higher scanning frequencies (e.g., flicker-free television, visual display unit), the generation of the horizontal-deflection current is separated in frequency from the generation of the operating voltages by supplying the horizontal-deflection circuit from a DC voltage source which is part of the voltage power supply providing the operating voltages. The supply circuit is preferably connected to the grounded deflection capacitor. This makes it possible to influence the picture geometry in a simple manner, particularly to perform horizontal pincushion correction.

Abstract: A sweep generator for the delivery of a sweep signal to a deflection system (typically horizontal) of a cathode ray tube, including a sawtooth generator for generating a sawtooth waveform containing a ramp which determines the duration of each sweep. A frequency divider such as a D flip flop is connected to a trigger circuit for generating, when enabled by a holdoff signal, output pulses whose recurrence rate is a submultiple of that of the incoming trigger pulses. Also when enabled by the holdoff signal, a sweep gating flip flop responds to the first output pulse from the frequency divider for causing the sawtooth generator to generate the sweep ramp. Thus, since the sweep gating flip flop does not directly responds to the trigger pulses, but to the output pulses of the frequency divider, no jitter is to take place if the holdoff signal acquires a prescribed state for sweep initiation concurrently with a trigger pulse.

Abstract: A phase-lock loop circuit of a video display apparatus is synchronized by a horizontal synchronizing input signal. The phase-lock loop circuit includes a frequency-to-voltage converter that is responsive to the synchronizing input signal for generating a control voltage indicative of the frequency of the synchronizing input signal. A voltage-to-current converter responsive to the control voltage generates a control current that is indicative of the frequency of the input signal. The control current varies the free running frequency of a controlled oscillator of the phase-lock loop circuit such that the free running frequency of the oscillator is directly related to the frequency of the input signal. The phase of the output signal of the oscillator is controlled by a second control current that is indicative of the phase difference between the oscillator output signal and the synchronizing input signal.

Abstract: The output of a deflection operational amplifier is coupled through a dissipation circuit to a deflection yoke coil of a stroke written cathode ray tube for deflecting an electron beam on the tube screen. A feedback circuit is coupled between the coil and the inverting input of the amplifier to control the current through the coil. The dissipation circuit comprises a dissipative resistor, such as an incandescent lamp, and a shunt connected bypass capacitor. The dissipation circuit dissipates power during coil steady current conditions such as exist during slow movement or hold of the electron beam on the screen when voltage across the coil is low but coil current may be high. Thus the power otherwise dissipated in the amplifier output transistors is dissipated in the dissipation circuit. The bypass capacitor passes high frequency deflection signals to the coil during coil high instantaneous current conditions corresponding to fast movement or slewing of the electron beam on the tube screen.

Abstract: A circuit for use in a video display apparatus corrects raster shift due to beam current variations. A horizontal retrace related pulse is applied to the ramp generator for the horizontal deflection phase control circuit, causing the retrace AC zero crossing of the ramp to shift under high beam current conditions. The phase control circuit then shifts the ramp signal to center the synchronizing pulses about the zero crossing, resulting in a raster shift which compensates for the raster shift introduced due to beam current variations.

Abstract: A circuit arrangement for a picture display device for generating a sawtooth line deflection current. The arrangement comprises a power supply transformer having a primary winding and a secondary winding. One end of the primary winding is connected to a terminal of a supply voltage source and the other end to a controllable supply switch whose other side is connected to the other terminal of the source. The secondary winding is connected in series with a line deflection coil, a trace capacitor, and a deflection switch. A retrace capacitor is connected to the line deflection coil. During the retrace period the line deflection coil, the trace and the retrace capacitors are part of a resonant network the elements of which determine the duration of the retrace period.

Abstract: A resonant magnetic deflection circuit is disclosed for reducing a retrace period of an electron beam scanning within a cathode ray tube (CRT) apparatus. Opposite polarity flyback voltage pulses occur at both ends of a deflection coil. As a result, an effective retrace voltage appearing across the deflection coil is approximately doubled, thereby reducing the retrace period of the electron beam scanning within the CRT apparatus. One end of the deflection coil is connected to a reference level source through a first parallel circuit and an S-correction capacitor, the other end thereof being connected to the reference level source through a second parallel circuit. The first and second parallel circuits comprise switching devices, damper diodes and retrace capacitors. Moreover, both ends of the deflection coil are connected to a power supply through a flyback transformer.

Abstract: A CRT display is provided with a multiple-pole, double-throw switching mechanism, which in conjunction with alternate circuitry provides a means for easily reconfiguring the CRT display presentation. By operating the switches the normal left to right, the top to bottom raster scan may, for example, become a bottom to top, left to right raster scan. When applied to a multicolor CRT display, a second multiple-pole, double-throw switching mechanism serves, upon operation, to redirect beam convergence signals in compliance with the reconfigured format effected by switching the deflection signals.

Abstract: The invention relates to a display screen horizontal scanning control protection device. The device comprises a switch making it possible to open or close the supply circuit of the scanning control circuit, said switch being activated with the aid of a signal supplied by an AND gate, whose state is a function of the level of the supply voltage of the central unit, which itself generates the horizontal scanning sync signal activating the scanning control circuit.Application to telematic terminals equipped with a cathode-ray tube screen.

Abstract: A high efficiency cathode-ray tube magnetic deflection circuit, providing a sawtooth current waveform at a frequency of 100 kilohertz that includes a FET transistor (11) connected to an anti-phased step-down transformer (15,16,17) for driving an output transistor (18). A co-phased step-up transformer (33,34,35) connected to the deflection yoke (19) provides deflection "S" correction, and also a dynamic focus waveform. The transformers have litz wire windings.

Abstract: A horizontal deflection circuit comprises a horizontal oscillator circuit, a drive transistor, a horizontal output transistor driven by the output of the drive transistor, a timing circuit for setting a timing delayed by about one fourth the horizontal scanning period from the terminating point of the flyback pulse generated at the collector of the horizontal output transistor, a phase difference detector circuit for detecting the phase difference between the leading edge of the collector pulse of the horizontal drive transistor and the timing set by the timing circuit, and a pulse duration variable output circuit triggered by the output of the horizontal oscillator circuit and with the output pulse duration thereof controlled by the output of the phase difference detector circuit.

Abstract: A horizontal width control circuit for use with an image display apparatus includes first and second variable inductors connected in series and shunt relationship respectively with a horizontal deflection coil. The inductance of the inductors are variable in opposite directions for controlling the extent of horizontal deflection through a relatively large range of values without detuning the horizontal deflection circuits.

Abstract: A side pincushion corrected deflection circuit for a television receiver includes a deflection winding, a trace capacitor and a first switch for generating scanning current in the deflection winding. A modulator circuit includes a modulator inductor and capacitor and a second switch for generating a sawtooth modulator current in the inductor. The trace and modulator capacitors are charged from a B+ operating voltage source through the primary winding of a flyback transformer. A transistor stage in the modulator circuit shunts current away from the modulator capacitor to control the modulator and trace capacitor voltages. A vertical rate bias voltage is applied to the transistor stage and varies the shunt current at a vertical rate in a parabolic manner to provide side pincushion correction. Under fault conditions, such as an open-circuited deflection winding or trace capacitor, the modulator capacitor voltage tends to undesirably increase above the peak voltage developed under normal operating conditions.

Abstract: Improvements to combined power supply and horizontal deflection devices in a television receiver.According to the invention, the line transformer includes a winding W.sub.1 for maintaining an oscillation circuit including the deflector Ly of the cathode-ray tube and a winding W.sub.2 which may be connected to a power supply source E through a controlled switch I.sub.2 ; the winding W.sub.1 is not effectively put into service for the sweep until a switch I.sub.3 or I'.sub.3 using a diode D'.sub.3 with a relatively long recovery time and operating in phase opposition with respect to I.sub.2 is closed, so that the temporary short-circuit of winding W.sub.1 during a sweep trace is not felt by the power supply source E.The invention mainly permits powering all the circuits of a television set from a single transformer, the line transformer.

Abstract: A circuit for driving a deflection coil comprising a capacitor (3) in series with the coil (2), a circuit (1) which drives a saw-tooth waveform current through the coil and capacitor, and a switchable resonant circuit (5, 6, 7, 8, 9) which generates across the capacitor a saw-tooth waveform voltage equal and opposite to the voltage drop attributable to a resistive component (4) of the capacitor/coil series circuit, thereby to effect loss correction.

Abstract: A program card comprised of passive elements is collocated or otherwise considered part of the cathode ray tube, CRT, module of a modularized display unit, and is used to dictate major system operating parameters to a set of cooperating electronic modules. This concept allows an appropriate standard set of electronic modules to drive CRTs of differing deflection angles, screen and neck sizes. Sparing cost and logistic complexity can be reduced at field installations which utilize CRT displays of various sizes.

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 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: A cathode ray tube deflection circuit is described which selects between two display formats in response to a format control signal. A horizontal deflection portion includes the primary winding of a flyback transformer resonant with a horizontal deflection yoke. Switches are connected across a portion of the primary winding and across portions of the yoke. A logic unit, in response to the control signal, actuates each of the switches to change the resonant frequency of the horizontal deflection circuit. The logic unit correspondingly changes the frequency of the horizontal drive signal and the amplitude of the vertical sweep.

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 system for selectively reversing the deflection sweep to a yoke coil of a television receiver system in which a double pole-double throw (DP-DT) switch reverses the current to the deflection coil, a solenoid relay actuates the DP-DT switch, and switch control and arrangement means for energizing the solenoid relay during times when power is not applied to the television receiver system. Also the system provides for a four or more sequential position switch in which intermediate portions of the switch perform as a break-before-make (BBM) stage and the outer portions of the switch positions perform as make-before-break (MBB) stages and the switch comprises a DP-DT and a four position switch operable mechanically in tandem.

Abstract: A television kinescope deflection circuit having improved linearity includes a deflection winding coupled in series with a first capacitor. A deflection switch and retrace capacitor are coupled across the serial combination of the deflection winding and first capacitor. The first capacitor responds to the deflection current to form a linearizing signal which modifies the flow of deflection current to provide S-correction. The linearity correction is improved by a series-resonant circuit coupled in parallel with the first capacitor and tuned to the second harmonic of the deflection frequency.

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: 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 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 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: A deglitch circuit is provided to connect a source of changing voltage or current to a utilization device to eliminate unwanted voltage excursion contemporaneous with changes in amplitude. The deglitching circuit includes one transformer winding with a center tap connected to the source and a pair of serially connected diodes connected to terminals of the winding. Another winding of the transformer is connected to a source of potential through switches which allow the other winding to alternately conduct current in one or another sense. Changes in the sense of current conduction through the other winding induce a voltage into the one transformer winding. Depending on the change in current this voltage may forward bias the diodes and provide the effect of a closed switch between the source and the circuit output, which is taken at the junction of the diodes.

Abstract: The current in the deflection coil of a video display system is converted into a DC voltage and applied to a peak detector. Peak values of the DC voltages as stored by the peak detector are amplified and then compared with a reference voltage at the input of a comparator amplifier. The comparator amplifier provides an output as a base drive to a regulating transistor that has an emitter-collector junction in series with the deflection coil and an unregulated source of DC power.

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 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 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 generator suitable for producing a sawtooth and a parabolic signal for the line or field deflection in a television system. The generator is provided with two dc coupled, series-connected difference amplifiers with feedback, which are each part of an associated integrating circuit. Via a peak detection circuit the output of the second difference amplifier is connected to the non-inverting input of the first difference amplifier. The second integrating circuit has been rated in such a way that the peak-peak value of the parabolic signal is half that of the sawtooth signal, while independent of the peak-peak value adjustment the ground potential is present in both signals in the center of trace; consequently there are no centering difficulties.

Abstract: A vertical deflection circuit for television receivers or the like which has an output stage of single-ended push-pull amplifier configuration is provided with a power supply circuit which includes a rectifying circuit connected between a D.C. voltage source and the output stage for rectifying an external A.C. voltage fed thereto to produce an additional D.C. voltage. The power supply circuit supplies a first D.C. voltage from the D.C. voltage source to the output stage during the first half of a trace or scanning period and supplies a second D.C. voltage, obtained by adding the additional D.C. voltage to the D.C. voltage from the D.C. voltage source, to the output stage during the second half of the trace or scanning period and during the retrace period.

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.