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Digitally controlled bench PSU

Posted on Thursday, July 31st, 2014 in power supply by DP

psudig_sch_1

Bertho posted a digitally controlled PSU design in the forum. He writes:

The design is for 0…30V and 0…3A (90W) controllable at ~1mV and ~0.1mA steps. The actual accuracy is still out for testing and I assume that noise and non-linearity will be a factor to look at when time comes. The basic design allows for 0…42V (max 45V) and (at least) 0…4A, but then all the components should be re-calculated to match such setup. Also, some components need to be voltage matched for a higher input voltage.
The design is a dual control-loop where the first stage is a switching PSU which is fed back to assure a 2.5V drop over the secondary analog control stage. The secondary stage is also responsible for the current limiter. The idea here is to reduce the power loss in the BJT (Q4) in the analog stage.

This entry was posted on Thursday, July 31st, 2014 at 1:00 pm and is filed under power supply. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

2 Responses to “Digitally controlled bench PSU”

  1. Mahesh says:

    looks promising for me but it constant voltage or constant current one?

  2. Bertho says:

    Can do both constant current and constant voltage. Both are regulated.

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