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Circuit inside PC power supply
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electronics forum beginner

Joined: 08 Jun 2010
Posts: 2

PostPosted: Tue Nov 01, 2011 10:07 am    Post subject: Circuit inside PC power supply
Subject description: Purpose of it?
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my pc power supply broke yesterday, so instead of trashing it, I opened it to salvage some components. I found this small board inside:

The psu has and input connection and an aux port to power up the monitor.

This small board was fitted so that it received mains power from the left (from the main cable), then the output (right side) was connected to the main psu circuit board by a couple of wires and soldered to the monitor socket.

This should be the circuit, the "out" label is going to the monitor and the psu board.
Value for the resistor and cap are correct, no clues for the inductors value, as far as I could observe, there were no values written.

So, what's its purpose? passive PFC? how could I see something interesting from LTspice simulation?

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