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Precision power supply Question...

Discussion in 'Power Electronics' started by medictrode, Aug 2, 2015.

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  1. medictrode


    Feb 21, 2013
    Hello all,

    So I've made quite a few power supplies for various things like my Ham radio gear and lighting projects. Most are linear based for the bigger amperage's, although I've done a few based on the LM2596 Buck converter. Most of the higher amperage ones have current pass transistors, some in the TO-3 Style on a heatsink driven with various regulators like the lm317/7805/7812 etc.

    One problem I've encountered when driving the current pass transistors is the unstable voltage output. When you look at a commercial power supply, as the amperage increases you will see a voltage increase as well on the base of the transistors to compensate for the lowering voltage on the output of the supply. My designs don't do this, and I would like to be schooled on methods on how to do so. Any help would be appreciated as I have a "thing" for building power supplies ..:)
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    The key is that it is important for the series pass transistor to be inside the feedback loop (and that you've got one :) )

    It would be interesting to see the designs you've used and maybe we can comment on how this feature could be added, or suggest different designs with this behaviour.
  3. chopnhack


    Apr 28, 2014
    Hi medictrode, please share your designs, I would love to see what you have come up with as I have an interest in building some bench power supplies. Thanks in advance.
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