TRANSFORMER-DIODE ISOLATED CIRCUITS FOR HIGH VOLTAGE POWER SUPPLIES

• US 3,815,015 A
• Filed: 02/20/1973
• Issued: 06/04/1974
• Est. Priority Date: 02/20/1973
• Status: Expired due to Term

• Current Assignee: Flavian Reising Jr, William A. Swin
• Original Assignee: Flavian Reising Jr, William A. Swin
• Inventors: Swin, William A., Reising, Flavian Jr.
• Primary Examiner(s): Pellinen, A. D.
• Application Number:
  US05/334,046
• Time in Patent Office: 469 Days
• Field of Search: 307/17,24,25,28,30,34,38,39,60,75,83 321/2,15,18 323/4,6,8,22T,23,25,38,62
• US Class Current: 323/267
• CPC Class Codes: G05F 1/577 for plural loads

Abstract

An improved power supply having a single input stage which operates a plurality of output stages. The input stage includes an isolation transformer or a push-pull drive circuit. This input stage controls a plurality of regulated output stages. The output stages may include either series or shunt regulators, however, at least one of the output stages includes a series regulator. The series regulated output stage includes a center tap transformer having a transistor connected to the center tap. The output voltage or current is sensed and fed back to the base of the transistor to regulate and keep constant the output voltage or current. A pair of rectifiers are connected between the series regulated output stage and the other output stages to provide isolation between the series regulated output stage and the other output stages.

Claims

1. A power supply for operating a plurality of output stages from a single input stage comprising:

an input stage for providing driving voltage;

a plurality of output stages connected to said input stage;

output terminals connected to each of said output stages;

at least one of said output stages including a series regulator;

each of said output stages including a transformer having primary and secondary windings, said primary winding of said series regulated output stage having a tapped portion;

said series regulated output stage further including a transistor having first, second and third terminals, said first terminal being connected to said tapped portion of said primary winding of said series regulated output stage;

means for connecting said second terminal of said transistor to a source of operating voltage;

feedback control means connected to said third terminal of said transistor;

at least one unidirectional current blocking means connected between said at least one series regulated output stage and at least another output stage whereby said at least one series regulated output staGe is electrically isolated from said at least another output stage.

2. A power supply circuit as set forth in claim 1 further including means for connecting a second source of operating voltage to said another output stage primary winding.

3. A power supply circuit as set forth in claim 1 wherein said feedback control means includes a comparator having a first and second input terminals and an output terminal, means for connecting said first input terminal to a reference signal source, said second input terminal connected to said output terminal of said series regulated output stage, said output terminal connected to said third terminal of said transistor, whereby the conduction level of said transistor being determined by the relative signal levels on said first and second input terminals.

4. A power supply circuit as set forth in claim 3 further including voltage sensing means connected between said output terminal of said series regulated output stage and said second input terminal of said comparator, whereby the output voltage of said series regulated output stage may be made substantially constant.

5. A power supply circuit as set forth in claim 3 further including a current sensing means connected between said output terminal of said series regulated output stage and said second input terminal of said comparator, whereby the output current of said series regulated output stage may be made substantially constant.

6. A power supply circuit as set forth in claim 1 wherein said unidirection current blocking means includes at least one rectifier.

7. A power supply circuit for providing regulated multiple outputs comprising:

input means for connecting the circuit to a source driving voltage;

a push-pull oscillator connected to said input means;

a first transformer having at least primary and secondary windings, said first transformer indirectly connected to said push-pull oscillator;

means for connecting a source of operating voltage to said first transformer primary winding;

a second transformer having primary, secondary, and feedback windings, said second transformer primary winding being connected to said push-pull oscillator;

first and second rectifiers, said first rectifier being indirectly connected between one side of said first transformer primary winding and one side of said second transformer primary winding, said second rectifier being connected between the other side of said first transformer primary winding and the other side of said second transformer primary winding;

said pair of rectifiers being poled in such a direction for preventing electrical interaction between said first transformer primary winding and said second transformer primary winding;

signal sensing means connected to said second transformer secondary winding;

signal comparator means connected to said signal sensing means for comparing the signal on said second transformer secondary winding to a reference signal;

a transistor having first, second, and third terminals, said first terminal being connected to said means for connecting a source of operating voltage, said second terminal being connected to said second transformer primary winding;

said third terminal being connected to said comparator means whereby the signal on said second transformer primary winding is regulated.