Power supply with two output voltages

Details Power supply with two output voltages Power supply with two output voltages

1988-02-29

1989-05-30

Wong, Peter S.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

323268, 323270, 323902, 358190, 315411, H02M 3335

Patent

active

048356689

ABSTRACT:
A power supply circuit for generating two direct voltages. A preload, having a tap for deriving the second voltage, is arranged between the lead conveying the first voltage and a reference potential. To prevent mutual influences between the two voltages, the preload is in the form of a series arrangement of at least one resistor and a plurality of reverse-biassed semiconductor diodes, an abrupt change of the differential resistance occurring above a given value of the current through these diodes. A controllable semiconductor element for controlling the second voltage is incorporated between the tap and the lead conveying the second voltage. The first voltage may be an E.H.T. for a final anode of a picture display tube, the second voltage is then a focussing voltage for a focussing electrode of this tube.

REFERENCES:
patent: 3192467 (1965-06-01), Baracket
patent: 3237078 (1966-02-01), Mallory
patent: 3321631 (1967-05-01), Biard et al.
patent: 3458801 (1969-07-01), Polson
patent: 4531181 (1985-07-01), Herz et al.

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