Browse Prior Art Database

Power Filter Configuration

IP.com Disclosure Number: IPCOM000087126D
Original Publication Date: 1976-Dec-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Hart, BE: AUTHOR

Abstract

The filter circuit shown in Fig. 1 has a number of advantages in power supplies. Inductors L1A through L4A and L1B through L4B act as filter inductors for rectifier 10. Additionally, the relationship of these groups of windings provide common mode noise rejection. Finally, provision of auxiliary windings L1A' - L4A' and L1B' - L4B' provide related circuit elements for sense outputs or other circuit purposes.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Power Filter Configuration

The filter circuit shown in Fig. 1 has a number of advantages in power supplies. Inductors L1A through L4A and L1B through L4B act as filter inductors for rectifier 10. Additionally, the relationship of these groups of windings provide common mode noise rejection. Finally, provision of auxiliary windings L1A' - L4A' and L1B' - L4B' provide related circuit elements for sense outputs or other circuit purposes.

Figs. 2 and 3 show plan views of a physical structure providing the equivalent circuit of Fig. 1 in a structurally compact manner. In this showing, the bar conductors are given reference numerals corresponding to the related parts of the circuit of Fig. 1.

The bars act as single-turn inductors. Capacitors C1 and C2 are attached between the main conductor bars by clamps 12 and 14 which serve to connect C1 and C2 in the circuit functionally, as shown in the schematic of Fig. 1.

If desired, the auxiliary bars L1A', etc., can be multiple turn (L4A' connected to L4B' and so on) to provide a turns ratio for desired circuit purposes, for example, in the use of filter energy for regulator transformer reset, shown on pages 2594-2595 of this issue.

As shown in cross-section A-A (Fig. 3) the core elements are provided with air gaps 16 which prevent saturation at the current rating of the device.

1

Page 2 of 2

2

[This page contains 4 pictures or other non-text objects]