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: An input signal is converted into a dc voltage proportional to the frequency of the input signal in a frequency-voltage converter, while saw tooth waves are generated in a saw tooth wave generator triggered with the input signal. The dc voltage is applied to a variable resistance circuit where the resistance is changed corresponding to the dc voltage. The period of such saw tooth waves is controlled with the variable resistance circuit so that the saw tooth waves may follow the input signal frequency for automatically indicating at all times a desired number of waveforms on the screen of a cathode-ray tube. The variable resistance circuit may be controlled with means for free running operation of the saw tooth wave generator during the absence of the input signal.

Abstract: A high voltage generating circuit for a television receiver which includes a horizontal oscillator and a switching circuit operating at the horizontal sweep frequency of the television receiver and being coupled to a flyback transformer which has an input resonant frequency in the vicinity of but higher than the horizontal oscillator frequency. The output of the flyback transformer is coupled to a rectifier circuit which in turn is coupled to the high voltage anode of the television receiver. The flyback transformer also has an input resonant circuit which includes a capacitor which is serially connected to the primary winding of the flyback transformer. This series resonant circuit is resonant at a frequency in the vicinity but less than the frequency of the horizontal oscillator with the result that improved voltage regulation is obtained while avoiding excess high voltage which otherwise would be caused by a shift in the output frequency of the horizontal oscillator.

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 switched-mode power supply provided with a control stage and a switching stage coupled by means of a transformer. The collector of an additional transistor is connected to the transformer. In this manner the ratio of the collector current to the base current of the switching transistor can assume a predetermined value, for example a constant value whatever the value of the mains voltage applied to the power supply.

Abstract: An arrangement for varying the triggering phase of a thyristor or other controllable switch employed to vary the excitation of a sweep deflection circuit during changes in the circuit load is described. The output of a winding of the deflection transformer is converted to a constant-amplitude sawtooth voltage which has a DC component proportional to the amplitude of the then-occurring forward sweep portion of the sweep voltage. A zener diode or other comparison element coupled to the output of a variable voltage divider whose input is fed by the resulting sawtooth voltage generates a trigger pulse for the controllable switch at the instant, during each cycle of the sweep waveform, that the constant-amplitude sawtooth voltage exceeds a predetermined value.

Abstract: The deflection system includes a first pair of deflection coils connected in series for moving the beam of a cathode ray tube in a horizontal direction and a second pair of deflection coils having a choke connected in series therebetween with a first capacitor connected in parallel with the choke and one coil and a second capacitor connected in parallel with the choke and the other coil to linearly add a relatively low and a relatively high frequency deflection signal for moving the beam in steps vertically across the cathode ray tube and linearly in small vertical sawtooths between the steps.

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 constant current sink for a cathode ray tube (CRT) display system is disclosed. The display system includes X and Y deflection coil current drive systems including parallel coupled constant current sinks that establish the deflection-determining current levels that flow through the X and Y deflection coils. Each constant current sink draws a fixed current level, and one or more are selectively switched ON, i.e., caused to draw a fixed current level through the deflection coil load from a first power supply, or OFF, i.e., caused to draw the fixed current level from a second power supply, to establish the desired electron beam position on the CRT. Means are provided for correcting for the pin-cushion, i.e., non-linear, effects associated with a flat CRT face.

Abstract: A deflection circuit wherein coupling capacitors are placed in series with the transformed yoke impedance to reduce capacitance values and voltage ratings of these capacitors. One of the coupling capacitors also serves to integrate a centering current developed by a centering circuit, thereby providing for a relatively uniform direct current component through the yoke windings throughout each horizontal line of scan.

Abstract: In a vertical deflection output circuit comprising two transistors connected in push-pull configuration, the junction point of the two transistors is connected through a series circuit of a capacitor and a vertical deflection coil, with a first power source and also connected through a switch, which is turned on during the vertical retrace period, with a second power source whose voltage is higher than that of the first power source, and one end of a bootstrap capacitor is connected with the junction point while the other end of the bootstrap capacitor is connected with the base of one of the two transistors and also connected through a resistor with the second power source, whereby the bootstrap capacitor is prevented from being exposed to a voltage whose polarity is opposite to that of the voltage developed across the bootstrap capacitor due to the charging thereof.

Abstract: Interference oscillations in the frequency ranges around 0.2 MHz and 1 MHz are eliminated in a deflection coil by the provision of an additional circuit element. The additional circuit element can be formed by an additional electrically conductive foil which is connected to the current supply side of the line coil sections or by a capacitor which connects this supply line to the central contacts of the series-connected frame coil sections. The connection of the coil sections with respect to each other should usually be adapted to the winding sense of the coil sections so as to ensure proper elimination of the interference oscillations.

Abstract: A vertical deflection circuit which vertically deflects the electron beam of a cathode ray tube in response to vertical synchronizing pulses comprises a vertical deflection coil having one end connected to a reference voltage source and the other end connected to a first and second current generating means. The first current generating means generates a current having a repetitive sawtooth waveform which is in synchronism with vertical synchronizing pulses; and the second current generating means generates a constant current whose amplitude is selectively adjustable to control the vertical starting position of the electron beam of the cathode ray tube.

Abstract: A deflection system for television cameras or the like. It is provided with a circuit for producing a reference sawtooth wave signal and means for comparing the reference sawtooth wave signal and sawtooth wave current flowing in the deflection coil, whereby the current flowing in the deflection yoke is controlled to give linearity and amplitude desired for the deflection by using a signal obtained from the comparison.

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 deflection system, utilizing a deflection generator coupled to a deflection winding to provide a current in the deflection winding having a magnitude which is a function of the elasped time after a retrace pulse and which changes substantially linearly, includes a retrace pulse generator. The retrace pulse generator utilizes a first gating circuit to provide for controllable coupling between a source of trigger pulses having a first time interval therebetween and a first monostable retrace pulse generator circuit. Fixed width retrace pulses are thereby generated in response to trigger pulses. A second monostable circuit responsive to the retrace pulses is coupled to the first gate for inhibiting the flow of pulses through the first gate for a second interval of time which is less than the first interval of time. The first monostable circuit is therefore immune to noise pulses occurring during the second interval of time.

Abstract: A deflection circuit has a sawtooth generator with a control input and an output stage, each having a different power supply. A control voltage derived from the output stage supply is applied to the control input to decrease the flyback period as the output stage supply voltage increases.

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.