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Parallel Operation of Power Supplies

IP.com Disclosure Number: IPCOM000038544D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Clemmons, E: AUTHOR [+3]

Abstract

This article describes a circuit arrangement for parallel operation of power supplies which allows redundant operation of two power supplies in separate enclosures supplying power to the same load. In parallel operation of two high frequency power supplies two problems are often encountered. These are: providing stable operation of the two supplies and turning off one supply without affecting the performance of the other supply. Both problems are minimized when the control modules are located in close proximity and are powered from the same control voltage. The circuit arrangement disclosed herein relates to the situation when the two supplies are physically separated and the control circuits are powered from independent control voltages. To ensure stable operation two conditions must be met.

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Parallel Operation of Power Supplies

This article describes a circuit arrangement for parallel operation of power supplies which allows redundant operation of two power supplies in separate enclosures supplying power to the same load. In parallel operation of two high frequency power supplies two problems are often encountered. These are: providing stable operation of the two supplies and turning off one supply without affecting the performance of the other supply. Both problems are minimized when the control modules are located in close proximity and are powered from the same control voltage. The circuit arrangement disclosed herein relates to the situation when the two supplies are physically separated and the control circuits are powered from independent control voltages. To ensure stable operation two conditions must be met. The first condition is that the two supplies must be synchronized together. In this disclosure, synchronization is accomplished through cable U1 and connector X, as shown in the drawing. When the two supplies are connected to cable U1, the oscillators of control modules ZM1 (3524B) and module returns are connected together; this action ensures that the two supplies will operate at the same frequency and not cause oscillations in either supply. The second condition which must be met is to ensure a master and a slave supply. This is done by setting both supplies as a slave using R2 and C1 to set the clock frequency when the two supplies are...