| 摘要 |
<p>A switching high voltage supply of the type which includes the secondary of a high voltage step-up transformer in series with a DC high voltage power supply, such as for providing different high voltages to a cathode ray tube, includes a capacitor in series with the primary to establish DC voltages that result from random duty cycles and variable DC input levels, the capacitor voltage being fed to the regulation or control input of the DC high voltage supply, whereby DC voltages are coupled by the capacitor to the high voltage supply and AC voltages are coupled through the high voltage transformer. In a second embodiment, the transformer has two secondaries each in series with a high voltage supply controlled by the DC voltage of the capacitor, to provide related, switched high voltages, such as for the anode and the focus of a beam penetration cathode ray tube.</p> |
