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Fault Indication for Multiple Power Supplies

IP.com Disclosure Number: IPCOM000081504D
Original Publication Date: 1974-Jun-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 95K

Publishing Venue

IBM

Related People

Bodner, RE: AUTHOR [+3]

Abstract

Fault indication apparatus for multiple and multilevel power supplies indicates the type of fault, the power supply at fault and the voltage level or levels at fault. This type of fault indication apparatus enhances the ability to diagnose the problem causing the fault. Further, diagnostic assistance is provided by registering both present and previous fault indications.

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Fault Indication for Multiple Power Supplies

Fault indication apparatus for multiple and multilevel power supplies indicates the type of fault, the power supply at fault and the voltage level or levels at fault. This type of fault indication apparatus enhances the ability to diagnose the problem causing the fault. Further, diagnostic assistance is provided by registering both present and previous fault indications.

In Fig. 1, power supplies 10, 20 and 30 provide a plurality of voltages to a utilization device, such as a computer system, not shown. Fault encoding logic 40 is responsive to signals from power supplies 10, 20 and 30 to provide bit signals 0 and 1, indicating the type of fault; i.e., overvoltage, undervoltage, overcurrent; bit signals 2 and 3 indicating the power supply at fault and bit signals 4-7 inclusive, indicating the voltage level at fault.

The encoded fault indications are set into a present fault register 80 and are displayed by display indicator lights 110 when switch 100 is set, as represented by 100a. Whenever there is a change in the present fault indications, they are transferred to a previous fault register 120 and then the new present fault indications are set into register 80. The previous fault indications are also displayable by display indicators 110 and are displayed when switch 100 is set, as represented by 100b.

Fault encoding logic 40 is shown in detail in Fig. 2. Latch 49 is set whenever there is any error or fault condition under control of OR circuit 48. Hence, if any of the power supplies 10, 20 or 30 have a fault condition, as indicated by bit 0 for supply 10, by OR circuits 44, 45, 46 and AND...