Browse Prior Art Database

Three Phase DC Power Supply with High PLD Tolerance

IP.com Disclosure Number: IPCOM000050881D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Driscoll, CD: AUTHOR [+4]

Abstract

This article describes a feed forward/ feed back DC power regulator for producing a regulated DC voltage which is highly tolerant of power line disturbances (PLDs) in individual phases of a three-phase AC supply. The phases are controlled quasi independently to reduce inter-phase effects on the regulated DC output.

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Three Phase DC Power Supply with High PLD Tolerance

This article describes a feed forward/ feed back DC power regulator for producing a regulated DC voltage which is highly tolerant of power line disturbances (PLDs) in individual phases of a three-phase AC supply. The phases are controlled quasi independently to reduce inter-phase effects on the regulated DC output.

Referring to the drawing, the power regulator is driven by a transformer which includes a three-phase, delta-connected primary winding 10 and three separate secondary windings 12, 14, 16, each of which has a grounded center tap. The opposite ends of each of the secondary windings are connected to the anodes of a pair of silicon-controlled rectifiers (SCRs) having a common cathode connection. For example, winding 12 is connected to SCRs 18A, 18B. The common cathode connection of the SCRs 18A and 18B is connected to one terminal of a choke 20 which, in combination with a capacitor 22, is part of an LC averaging circuit. Similar chokes 24 and 26 are connected in circuit with the secondary windings 14 and 16, respectively. The output voltage V (o) of the LC filter is applied across a load 28.

The firing angles of the SCRs in each of the three secondary winding circuits are controlled independently by comparing and error voltage derived from V(o) with the actual voltage generated in the primary circuit. The use of separate chokes in each of the secondary phase circuits, reduces the interphase effects on th...