Comments on: Safety analysis of one USB power supply

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By: Tomi Engdahl

Tomi Engdahl — Thu, 09 Jun 2022 08:02:37 +0000

Don’t buy cheap death-wish chargers
https://www.youtube.com/watch?v=rwEh4jsVew0

While it’s commendable that Apple introduced style to humble things like USB chargers, it’s not so commendable that the inevitable clones tried to jam all the required circuitry into a tiny plug and sell it for a pound/dollar/euro.

This charger was bought from a high street store in Glasgow. An independent Asian pound shop (UK dollar store) that I actually like a lot, but this shouldn’t really be on their shelves.
Most high profile pound shops charge around £2 for a basic charger and they are generally OK. But even the bigger names like Pound World (Now called One Below) fell foul of selling dangerous chargers. Their current offering does look safer, but Poundland is still the king for better quality tech.

I personally use an IKEA USB charger for all my tech. (Not a sponsor.) With a genuine Motorola charger for battery capacity tests. (Also not a sponsor.)

I’ve said it before and I’ll say it again. Don’t buy cheap power supplies. Only buy them from prominent brands with a reputation to protect. That includes ASDA and Walmart. A USB charger is an essential part of modern living, and plugging your £$€1000 smartphone/tablet into a £$€1 charger is basically a death wish for you and your tech.

By: Tomi Engdahl

Tomi Engdahl — Mon, 30 Sep 2019 17:13:18 +0000

I can’t give generic answer for this based on information you have given.
The needed creepage distance depends somewhat on the materials used, environment and the safety standard you need to follow.
There are some differences on the demands on different standards.

By: frank

frank — Mon, 30 Sep 2019 08:28:32 +0000

Hi,

We use an off line application powered the circuit with 230Vac+20%=276Vac after the rectifier diode we have 390Vdc. For a double insulation, where I have 276Vac creepage distance is 6.4mm, after the diode (390Vdc) 8mm. that’s right or I have to use 8mm everywhere. Thanks.

By: Tomi Engdahl

Tomi Engdahl — Thu, 08 Sep 2016 12:20:18 +0000

Crappy PSU analysis
https://www.youtube.com/watch?v=T88ej64aXUM
Pulling apart a too-cheap-to-be-true PSU. Guess what… it was too cheap.

Inside a reasonable quality Chinese PSU
https://www.youtube.com/watch?v=1F3XlFI1JBo