A solid-state horizontal deflection circuit including a high voltage applying circuit for a television receiver or the like in which a gate-controlled switching device is used for applying a deflection current to a horizontal deflection coil to perform horizontal beam scanning and another semiconductor switching device is used for applying a pulse voltage to a flyback transformer to produce a high voltage supplied to a cathode ray tube, and further a couple of diodes connected in series are provided in connection with the above two switching devices. Both switching devices are turned on in response to a horizontal driving signal supplied to at least one of them and turned off by the recovery current of the series-connected diodes.
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.
Disclosed is a circuit powered from an unregulated voltage which generates television line scan deflection signals and a regulated voltage to power other circuits comprising a transistor with its input fed by variable width input pulses and its output transformer coupled to feed a storage capacitor for the regulated voltage resonant circuit including the deflection coils for scan generation, the transformer primary being connected to the collector of the transistor through a diode poled to block direct connection between the primary and secondary. Picture tube high voltage may be generated by an additional transformer secondary from the transistor or by inclusion of a transformer as part of the resonant circuit.
A horizontal deflection circuit for a television receiver including a deflection unit having a sweep control, commutation switch and a controlled switch for controlling the energy stored in the horizontal final stage. Said energy controlling means including a thyristor for controlling switch energy returned to the power line so that the energy stored in a commutating capacitor is essentially constant for each sweep and the deflection current is independent of line voltage.
