EcoRenovator - View Single Post - Unnecessary use of line-voltage power electronics is getting excessive

Quest · 08-13-14, 12:24 AM

I'm with NiHaoMike on this said subject.

don't blame China for all those failures, for it's the consumer-driven market that demands such low price and reliability associated with it, period.

I have been involved in linear and SMPS design and repair for quite some time now, and I can tell you that things like SMPS can certainly last if you design and build them conservatively (with twice the operational headroom if possible).

I have SMPS that lasted at least 6+yrs continuously running @ 80% duty and still tested good. Of course: it costs me 5 x more to source the highest quality components and also to build them in the most conservative manner (I add DC cooling fan as forced air cooling when it's being called for.

For linear PSU: it's all about the copper and the laminates and one must over-build them (or build them conservatively) in order to make them last. Duty cycle must not be more than 80% continuously for the copper wires and the laminates will heat up and hasten their failures.

Q.

08-13-14, 12:24 AM	#15
Quest Apprentice EcoRenovator Join Date: Feb 2011 Location: Canada Posts: 109 Thanks: 13 Thanked 13 Times in 11 Posts	I'm with NiHaoMike on this said subject. don't blame China for all those failures, for it's the consumer-driven market that demands such low price and reliability associated with it, period. I have been involved in linear and SMPS design and repair for quite some time now, and I can tell you that things like SMPS can certainly last if you design and build them conservatively (with twice the operational headroom if possible). I have SMPS that lasted at least 6+yrs continuously running @ 80% duty and still tested good. Of course: it costs me 5 x more to source the highest quality components and also to build them in the most conservative manner (I add DC cooling fan as forced air cooling when it's being called for. For linear PSU: it's all about the copper and the laminates and one must over-build them (or build them conservatively) in order to make them last. Duty cycle must not be more than 80% continuously for the copper wires and the laminates will heat up and hasten their failures. Q.