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Making paralleled SMPS's share current between them.

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treez

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Hello,
The attached is two SMPS’s in parallel. They both feed into the same output which is voltage regulated.
There is a single error amplifier which feeds the two controllers (one for each SMPS). There is a micro which senses the current supplied by each of the paralleled stages and then makes adjustments to each stage in order to ensure they share the current between them.

The micro does this gradually in a slow loop. –This ensures no oscillation.

The load is a constant load (and in the real application will be of much higher power level).

Can you think of a better way to do this?
 

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Can you think of a better way to do this?
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Maybe not better, but different...

As you will already know, conventional dual tracking power supplies have a "master" and a "slave" where the master is controlled in a conventional closed voltage loop, and the slave adjusts to eliminate any voltage difference between itself and the master.

Load sharing could be done the same way, by running the slave off the difference between the master and slave current shunts, such that both supplies always deliver the same current.
 
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