Author Topic: DRSSTC with parts from computer PSU  (Read 687 times)

Offline Zipdox

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DRSSTC with parts from computer PSU
« on: December 16, 2019, 10:08:56 PM »
Computer power supplies contain a lot of high voltage components like rectifiers, capacitors, MOSFETs, diodes as well as loads of inductors. I was wondering if it was realistic to build a DRSSTC with components from a PSU.

Offline AstRii

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Re: DRSSTC with parts from computer PSU
« Reply #1 on: December 16, 2019, 10:21:58 PM »
Depends, i think you have no chance of doing that if you want a high power DRSSTC, since you need IGBTs to switch very high currents, even a small DRSSTC runs 200A+ on primary. And in computer PSU you probably will not find any IGBTs. All of the computer PSUs i've dissassembled used MOSFETs, and as far as i know, you would fry MOSFETs when switching high currents. Also for DRSSTC you need way bigger bus capacitance than computer PSU capacitors can provide.
« Last Edit: December 16, 2019, 10:23:39 PM by AstRii »

Offline Zipdox

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Re: DRSSTC with parts from computer PSU
« Reply #2 on: December 16, 2019, 10:40:05 PM »
Depends, i think you have no chance of doing that if you want a high power DRSSTC, since you need IGBTs to switch very high currents, even a small DRSSTC runs 200A+ on primary. And in computer PSU you probably will not find any IGBTs. All of the computer PSUs i've dissassembled used MOSFETs, and as far as i know, you would fry MOSFETs when switching high currents. Also for DRSSTC you need way bigger bus capacitance than computer PSU capacitors can provide.
Most PSU's contain 2 MOSFETS to switch rectify mains voltage. The one I disassembled had 2 21NM60N's which are rated for up to 600 volts. Would it be possible to utilize those in some way?

Offline Mads Barnkob

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Re: DRSSTC with parts from computer PSU
« Reply #3 on: December 16, 2019, 11:11:56 PM »
You would at most be able to make a small SSTC from a computer PSU, not a DRSSTC.

You would still need to buy some components like a suitable ferrite ring core for the GDT and some MOSFET driver ICs.

The only things to use from the PSU would be: bridge rectifier, electrolytic capacitor, MOSFETs, maybe heat sink, the rest is of no real use.
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Offline Zipdox

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Re: DRSSTC with parts from computer PSU
« Reply #4 on: December 16, 2019, 11:27:39 PM »
You would at most be able to make a small SSTC from a computer PSU, not a DRSSTC.

You would still need to buy some components like a suitable ferrite ring core for the GDT and some MOSFET driver ICs.

The only things to use from the PSU would be: bridge rectifier, electrolytic capacitor, MOSFETs, maybe heat sink, the rest is of no real use.
These are all the power semiconductors I found inside
  • 2x GBU606
  • 2x F21NM60N
  • 4x FCP20N60
  • 7x YM303045N
The F21NM60N and FCP20N60 seem very similar if you look in the datasheet. I was thinking maybe I could put 2 FCP20N60's in parallel and create a half bridge with a pair of those.

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Re: DRSSTC with parts from computer PSU
« Reply #4 on: December 16, 2019, 11:27:39 PM »

 


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