Скачать или смотреть Inside a fake Mean Well DIN-rail PSU - with schematic

Despite the odd name, Mean Well is one of the premium manufacturers of power supplies, with generously rated components and excellent quality control.
As such, they frequently get cloned, and while some of the clones unfortunately use the real logo, others make subtle changes to the shape of the logo while still maintaining its familiar appearance.

I was expecting the insides of this unit to be a generic cheap power supply with poor isolation, but in reality they seem to have cloned Mean Wells design quality too. There's basic noise filtering, proper isolation, copper windings and what appears to be a real class-Y safety capacitor. The control chip they've used is rated to a higher power level than the supply rating and the feedback for the adjustable voltage control is done with good circuitry.

Yes I did mix up the primary and secondary windings in the video. Partly because I was expecting it to have two layers of primary windings on either side of the secondary, and partly because I'm always thinking ahead as I speak. The primary-sandwich construction is probably less critical in this application because of the opto-isolated feedback requiring less accurate inter-winding coupling than primary side feedback.

Here's a link to the power supply on AliExpress (not a sponsor).
If you view it or put it in your basket it may also come up in the bundle deal section.
This is an affiliate link, but that will not affect the price you pay.
https://s.click.aliexpress.com/e/_c3x...
The price can vary up and down, but is typically between £3 and £5.

There are 5V, 12V and 24V versions available.

Just for completeness, there were 90 turns on the primary of the transformer.



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