ES237217U - Circuit of sweeping of lines for cathode rays, especially for the image of television receivers. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Line sweep circuit for cathode ray tubes, especially for the image of television receivers, which produce or conform a deviation or deflection current in the form of a sawtooth that circulates through a deflection coil, characterized in that the deflection coil is part of a parallel resonant circuit, which acts in the return range, which is furthermore provided with a capacitor conditioned by the flow or sweep voltage, a return capacitor and a first diode, wherein the current of deviation circulates during the first part of the outgoing time or swept by said first diode and during the second part of this time with polarity opposed by a switch, such as a transistor, which is governed by pulses and which is located in a parallel branch to the first diode; switch that is conductive during the second part of the outgoing or non-conducting time during the return time and where the energy is supplied by a supply voltage source to the primary winding of a transformer that is connected between said source and the switch transmitting to the parallel resonant circuit during the return time, and where at the end of the outgoing or sweeping time, ie when the switch is not conductive, the magnetic energy accumulated in said transformer is transmitted by a secondary winding, through a second diode that is conductive in the return time, to the parallel resonant circuit, and in which the switch, which will be connected in series with the primary winding of the transformer, is in turn connected in parallel to the first diode by means of a third conductor diode during the second part of the outgoing or sweeping time and connected at the junction of this series circuit, and where the inte switch to modify the amplitude of the deviation voltage is governed by making it conductive also during various intervals of the first part of the time deida or sweep, so that the amplitude of this is stabilized by means of a regulation of the duration of the control pulses, depending on the oscillations of the deviation or deflection voltage, when a determined point of the resonant circuit is connected to a pulse generator, so that the duration of the output pulses of this generator is regulated in dependence on the potential of said generator. In addition, the impulse generator is governed by the pulses with constant scanning ratio of a circuit, in which the impulses of the line frequency oscillator are compared with the return oscillators in a phase discriminator. That the regulation voltage is filtered by means of a first capacitor, this capacitor being connected to a positive operating voltage a through a second capacitor and a resistor connected in series with the previous one. (Machine-translation by Google Translate, not legally binding)