switch mode power supplies information

ANY Timer Switch
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Peter K asked What happens if I use less than the minimum rated current for a switch mode power supply?

I am going to use a switch mode power supply like this type. http://rswww.com/cgi-bin/bv/rswww/searchBrowseAction.do?Nr=avl%3auk&N=4294610152&name=SiteStandard&forwardingPage=line&R=3961970&callingPage=/jsp/search/search.jsp&BV_SessionID=@@@@1185453183.1168593899@@@@&BV_EngineID=ccddaddjlelehlicefeceeldgkidhgg.0&cacheID=uknetscape It has a minimum current rating of 0.4 Amps. I am going to be using a relay to interrupt the current to the main device so all that will be used is enough current to run the relay and an led. What sort of output will I get when the main power draw is disconnected. Options: 1) The voltage will go high. 2) The voltage will be unstable and show some sort of oscillation. 3) The PSU will shut down 4) Anything else that I haven't thought of I would like to have some sort of idea before I buy one. Has anyone got any practical experience?

And got the following answer:

For some reason my browser will not follow your link (perhaps it has your own account embedded in it or something?) so if you post the part number of the specific PSU you are looking at I can possibly answer with more detail. However, just from experience using computer type switching PSU's (AT and ATX styles) to run various instruments and test fixtures, I can tell you taht running such PSU's with less than the rated current draw usually causes them to shut down immediately. Some require power-cycling to come back up, others come up as soon as the load is increased. To get around this, we always added a power resistor in parallel to the target (load) device, such that even with no other load connected this resistor would account for the minimum current. After that, the switching PSU's always worked flawlessly for us.


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