Abstract 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.
A switchinG high voltage supply comprising: a high voltage DC power supply having a control input; a high voltage step-up transformer, said transformer having a primary winding and having a secondary winding connected in series between the output of said high voltage power supply and a load; a capacitor connected in series with the primary of said transformer; a switch driver for driving the series combination of said transformer primary and said capacitor; and means coupling DC voltages developed across said capacitor to the control input of said high voltage power supply.
Claim 2
Dependent Claim
92 words
A switchinG high voltage supply comprising: a high voltage DC power supply having a control input; a high voltage step-up transformer, said transformer having a primary winding and having a secondary winding connected in series between the output of said high voltage power supply and a load; a capacitor connected in series with the primary of said transformer; a switch driver for driving the series combination of said transformer primary and said capacitor; and means coupling DC voltages developed across said capacitor to the control input of said high voltage power supply.
Claim 3
Dependent Claim
68 words
A switching high voltage supply according to claim 1 wherein said transformer has a second secondary winding, and further comprising a second high voltage DC power supply having a control input, said second secondary winding connected in series between the output of said second power supply and a second load; and means coupling DC voltages developed across said capacitor to the control input of said second power supply.