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A short video about safety when using an oscilloscope to repair and test switch-mode power supplies.

Quite a few of my recent reviews have started with the words, “Some time ago, I posted a review...” This time is no different. I previously reviewed a power supply for an access control system, but that one was a 12 V 5 A model with an uninterruptible power supply function. This time, it’s a simpler version. You can find out more in the review itself.

Sometimes people bring me all kinds of devices to repair. This time, someone brought in an air conditioner control board with a preliminary diagnosis: the power supply had failed due to a voltage surge caused by a lightning strike.

Today's article is about the output rectifier, filter, and feedback circuit in switching power supplies. This is the final article in the general introductory series. After this, I plan to answer questions that came up while publishing the previous parts, and then take a closer look at some individual sections.

Today we'll look at the next stage after the inverter: the power transformer. This won't be a very long article, but I think it'll be useful.

Last time, I covered the input stage of a switching power supply, the bridge rectifier, and the filter capacitors. Now it’s time for the next stage: the inverter. This is the most complex and extensive part, but also the most useful.

Not long ago, I posted a review of a 360 W power supply. I mentioned then that I was waiting for a package with a couple more power supplies, but more powerful ones. The package has arrived, and I finally got around to the first one: a 480 W model. So far, this is the most powerful power supply I’ve reviewed (apart from bench power supplies), and it also has some notable differences from the previous ones. But as usual, I’ll take a look, tear it down, and test it.

Continuing my series on power supplies, I ordered another one, this time more powerful than the previous one. This review won't be very long, but as always, I'll inspect it, take it apart, and test it.