Universal input with toroidal transformer

[udhay_cit]

I want to replace my SMPS circuit with a toroidal transformer & linear power supply. My product specification is for universal AC input with my SMPS design. Now I'm replacing with 2 x 115V AC input toroidal transformer. For 110V or 220V selection, I'm using a slide switch as you can see from computer SMPS. Now my question is, Can I mention my product input as universal input?
For my previous SMPS design, its perfectly universal input supply without doing any change in hardware or setting. But if I replace the SMPS with toroidal transformer do we have to change anything in the product specification sheet?

Udhay

 

[KlausST]

Hi,

I'd say you have to change the specification.

Afaik especially in the USA you have to take care about inrush current. This is very high with a toroidal transformer.

About "universal input". My opinion: the toroidal solution in not considered to be universal. Wrong setting may cause overcurrent, overheating, fuse blow....

Why do you want to change from SMPS to toroidal? Isn't this a step back?

Klaus

 

[udhay_cit]

Klaus, I expected this question. SMPS is always superior in power supply interms of efficiency, weight, flexibility, repetability, etc., But I'm tired to design a SMPS which is compatible with CISPR11 standard. Our product enclosure is plastic & we can restrict the radiated emission noise upto CISPR 22 level. So I'm back to the toroidal transformer design. This design used maximum of 6W power. So I hope we may not take care for the inrush current?