Antec BP450PS 450W Power Supply Review

Secondary Section:

In the secondary you now have lower voltage from the transformer, but its pulsed. Bridge rectifiers are again used to convert it into DC. I could identify only 2 rectifiers without taking it apart, for the 3.3v line we have the MBR3045CT, which has a current rating of 30A. The this line is rated at 20A, we are good. The 5v line uses the MBR2045CT which has a rated current of 20A and as the line is rated at 18A, we are fine here as well.

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Now is the time to smooth out the pulsed DC. Here there are a bunch of capacitors and pi filter coils that are being used and got to do a lot more work than the ones on the primary, hence should be made using better quality capacitors for a long life. Most of the capacitors here are made by JunFu, which is definitely not top of the line (rather near the bottom) and have a mixed reputation. I guess if they are kept cool enough, they should last a while. There are 2 Aishi capacitors in the mix, could not find a lot of opinion about them online, but from what I could gather, they do their job.

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Also in the secondary we find the SDC2921 PWM controller, which doubles in as a protector circuit. It provides under voltage (UVP) and over voltage protection (OVP) to the 3.3v/5v/12v lines. I don’t see any monitoring IC (common in entry level units), so I am not too sure about any other protections offered.

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