Independent control of output current balance between...

Details Independent control of output current balance between... Independent control of output current balance between...

2008-01-29

2008-01-29

Sherry, Michael (Department: 2836)

Electrical transmission or interconnection systems

Plural load circuit systems

Control of current or power

C307S062000, C307S038000, C713S340000

Reexamination Certificate

active

07323794

ABSTRACT:
An information handling system power supply system has a plurality of power supply units (PSUs) with outputs connected in parallel and a current balancing circuit for equalizing current from these outputs. A pseudo output current value may be added to the actual output current value for each PSU so that the parallel load sharing current balance system thinks all of the PSUs are sharing the load equally. This allows simple and inexpensive paralleling of differently rated PSUs without complex load sharing circuitry. Also, PSU stress factors may be easily compensated. For each PSU there may be a first voltage, VS1, generated that is proportional to the output current of the respective PSU. A pseudo current bias voltage, VIbais, is added to the first voltage, VS1, to produce a biased second voltage, VS2, (VS2=VS1+VIbais). The biased second voltage, VS2, now represents the apparent current output of the respective PSU when current load balancing each PSU of the power supply system. A standard current balance circuit may now balance all of the PSUs for what it thinks are equal output currents from each of the parallel connected PSUs.

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Balogh, Laszlo,Paralleling Power—Choosing and Applying the Best Technique for Load Sharing, Texas Instruments Incorporated, pp. 6-1 through 6-30, 2003.

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