5V 2A power supply

Question

I have been working for a couple of months on an IoT project that controls AC through a triac. The project works quite well but to shrink it, I took apart a Raspberry Pi, 5V 2Amps power supply and soldered the input to the AC line and the output to the logic of the device, with excellent results. This works quite well for prototyping but now I want to scale production and tearing apart power supplies is not an option. So I am looking for the schematics of a power supply that works in a similar way of the ones that are used to charge phones/tablets, power single board computers, and similar stuff. Any help?

shabaz · Answer

Hi Enrique,

There are example reference designs at ti.com, for instance: PMP8363 85VAC-265VAC Input, 5V@2A Eco-Charger Reference Design for Tablets and Smart Phones | TI.com

However, you will want to read their disclaimer, or you may decide to use a module. There are AC-DC converter modules (chassis or PCB mount versions), no need to tear apart a consumer mobile phone charger supply. Here are some examples: PCB Mount Converters - AC / DC | Farnell element14

Definitely use these for a prototype provided you're taking the appropriate precautions, but if you're asking these questions for a production device, then you will need to hire an engineer for this part of the design (regardless of using a module or designing the entire power supply from scratch), (and for the rest of the design too, especially since you're switching mains power with your circuit) before seeking product approvals. Otherwise there are dangers like fires (this is realistic and likely, not far-fetched, unless you can tell me you are a qualified engineer).

geralds · Answer

Hi, also alternative to shabaz suggestion i would suggest a PS made by Power Integration: https://ac-dc.power.com/design-support/reference-designs/design-examples/der-471-15-w-cv-cc-isolated-flyback-converter/ You can find a lot of application notes also reference designs. The ref. des. are very fine described in details. e.g. "how to make the power transformer". Best Regards Gerald ---

5V 2A power supply

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