Abstract: The constitution comprises a circuit for feeding the blanking pulse winding voltage floating from a deflecting transformer 8 or a deflecting yoke 5 of a deflecting circuit 15 into a converter circuit composed of inductor 21, capacitor, diode, and resistance, and obtaining a comparative wave suited to a horizontal operation frequency, and means for changing the DC bias voltage value of comparative wave, controlling the drive pulse width of switching element 27, and controlling the high voltage output depending on changes of current flowing time width at the primary side of a high voltage generating transformer. It further comprises a power source winding 29 for controlling the oscillating voltage generated in switching OFF period of the high voltage generating transformer, or a regenerative winding 37 to power source, or both windings, and also means for adding a capacitor for preventing oscillation.

Abstract: A high-frequency horizontal deflection/high-voltage generation apparatus capable of setting inductance of a deflecting yoke without being affected by a collector voltage of a horizontal switching transistor and suppressing power loss while increasing a deflecting pulse voltage so that amplitude adjustment and side-pin correction can be effectuated without incurring any appreciable power loss. A voltage which is higher than the collector voltage V.sub.CP of the switching transistor is applied to the deflecting yoke. A resonant circuit is provided for applying to the deflecting yoke a voltage pulse of positive polarity and that of negative polarity, i.e., the voltage pulses bearing opposite phase relation to each other, for increasing equivalently the voltage applied across the deflecting yoke. The switching waveform outputted from the resonant circuit is synchronized with a switching operation of a high-speed switching element driven by a voltage induced in a winding of the deflecting transformer.