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Power Conditioning Unit

Discussion in 'General Electronics Discussion' started by strahd, Sep 25, 2015.

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  1. strahd


    Sep 25, 2015
    Hi guys , my teacher asked me to design a power conditioning unit like below.

    Power conditioning block diagram( Circuit Schematics are not mandatory, but as a result it will be evaluated as bonus point)
    Description: Input Voltage: 28VDC
    Output Voltage: according to 5 VDC, (Isolated) (10 points)
    according to 3,3 VDC, (Isolated) (10 points)
    according to 28 VDC (Isolated) (10 points)

    I choosed 2 regulators from Digikey for 3V3 and 5V output . But i guess , i must use 28V directly without regulator for 28V output? Or can i use 28V input voltage with some capacitors to eliminate noise . My last question , are they enough for power conditioning unit or something else is required and what does isolated stand for ? No other information about the question is given .
  2. Arouse1973

    Arouse1973 Adam

    Dec 18, 2013
    Hi and welcome to EP..
    What does he mean by power conditioning? Electronics component dont need moisturiser
    Martaine2005 likes this.
  3. strahd


    Sep 25, 2015
    Thanks for reply. He means power section of project.
  4. Old Steve

    Old Steve

    Jul 23, 2015
    'Isolated' means that there should be no connection between input and output.
    You'd need to use a switching power supply - switching 28VDC to the primary winding of a transformer at a reasonably high frequency, then rectifying the secondaries to give you DC outputs at the required voltages that are not connected to the input 28VDC and 0V rails.
    The regulators that you chose will be no good for this since they would share a common ground connection, both with each other and with the input voltage.
    (I'm assuming that they are linear 3-pin regulators)
    Last edited: Sep 26, 2015
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