Power Conditioning Unit

[strahd]

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 .

 

[Arouse1973]

Hi and welcome to EP..
What does he mean by power conditioning? Electronics component dont need moisturiser
Adam

 

[strahd]

Thanks for reply. He means power section of project.

 

[Old Steve]

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 .

'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)