Browse Prior Art Database

Power Supply Protection

IP.com Disclosure Number: IPCOM000097899D
Original Publication Date: 1961-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Fisher, RC: AUTHOR

Abstract

The power supply protection circuit is for one or several regulated supplies. Its operational features are over and under detection, lamp indication of the supply at fault, power removal from all supplies, and automatic one cycle resetting. Only the initial fault is indicated and not a condition resulting from it. The protection circuitry for two regulated supplies is formed by transformer 10, rectification and filtering circuits 12 and 14, and regulators 16 and 18. A normally closed three phase A.C. relay 20 is inserted between 10 and the A.C. power supply. When there is a voltage at either output 22 or 24, the initiator circuit is energized to provide the bias potentials that activate the protection circuits.

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 62% of the total text.

Page 1 of 2

Power Supply Protection

The power supply protection circuit is for one or several regulated supplies. Its operational features are over and under detection, lamp indication of the supply at fault, power removal from all supplies, and automatic one cycle resetting. Only the initial fault is indicated and not a condition resulting from it. The protection circuitry for two regulated supplies is formed by transformer 10, rectification and filtering circuits 12 and 14, and regulators 16 and 18. A normally closed three phase A.C. relay 20 is inserted between 10 and the A.C. power supply. When there is a voltage at either output 22 or 24, the initiator circuit is energized to provide the bias potentials that activate the protection circuits.

When an out-of-tolerance signal (under or over voltage) is applied to detection circuit A, indicator lamp A is energized and a signal passes through OR gate 26 to amplifier 28 which initiates the following actions:
1. Control matrix 30 is turned on and removes the drive current from regulators 16 and 18. As a result, the regulators are rapidly turned off. Matrix 30 also provides a low impedance path from detection circuit B to ground to short the signal that is generated by the detection circuit B as regulator B drops to zero volts. This prevents indicator B from turning on.
2. The A.C. power removal circuit 32 is energized and opens relay 20 in the A. C. power input lines more slowly than the turnoff of the regulators in step 1.
3....