evilrichy Posted March 23, 2007 Report Share Posted March 23, 2007 Hi all,My backgroud is polymer electronics mainly, but I'm looking into designing a power supply to run one of my devices from mains.My knowledge in this is rather limited - so apologies in advance!The specs for what I want are;Mains voltage input,5-10 V dc output @ 100-300 mA,Efficient as possible,Compact as possible.I've been searching the web for suitable designs, but have had no luck so far. Does anyone know if I can make such a supply? Ideally switch mode (I've been told that helps efficiency) and if posible, can it be done without transformer? I only ask this as the size of it would be an issue.Any help would be greatly appriciated!Many thanks,Rich Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted March 23, 2007 Report Share Posted March 23, 2007 A switch mode supply takes a DC input, and of course mains is AC. There isn't many parts to a switch mode supply, but I wouldn't recommend you design one if all you need is a DC power supply. Quote Link to comment Share on other sites More sharing options...
audioguru Posted March 23, 2007 Report Share Posted March 23, 2007 Go to an electronics surplus parts store.I bought some name-brand SMPS 5V/2A tiny and lightweight power supplies that were made by a computer router manufacturer for $2.50CAN each including taxes. Their voltage regulation is very good and their high frequency ripple is low.I have some similar very small SMPS that were made for charging cell phones. Quote Link to comment Share on other sites More sharing options...
indulis Posted March 23, 2007 Report Share Posted March 23, 2007 KevinA switch mode supply takes a DC input... No!!! A DC-DC converter has a DC primary. You've never heard of a "off-line switcher"? It's still a DC-DC converter on the back end with a AC-DC front end. What do you think the power supply in your computer is?? Quote Link to comment Share on other sites More sharing options...
mvs sarma Posted March 24, 2007 Report Share Posted March 24, 2007 KevinNo!!! A DC-DC converter has a DC primary. You've never heard of a "off-line switcher"? It's still a DC-DC converter on the back end with a AC-DC front end. What do you think the power supply in your computer is??perhaps one may not call it smps, but Triac (primary comtolled) AC-DCconvertes are not unpopular. may be the type of technology was used for battery charging.Sarma Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted March 24, 2007 Report Share Posted March 24, 2007 Indulis, I figure you are partially right. A switch mode power supply may contain a switching voltage regulator as well. Maybe he wants a switching regulator for his application. Quote Link to comment Share on other sites More sharing options...
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