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Class D Switching Power Amplifiers and Power D/A conversion

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Old 2nd September 2011, 07:58 AM   #11
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Of course no electrolytics are eternal, but in a linear supply their failure generally only causes higher ripple and are easy to replace restoring normal operation.
In a SMPS when they expire they generally cause lots of mayhem and blown silicon.
Well designed SMPS will have a longer MTBF but how many are well designed?, and even the good ones self destruct eventually.
The power converters now in use for PV cell power generation are all SMPS and some suppliers of these systems already recognise the problem and contract to replace the converters after a given time span.
Perhaps some nice kind person could send me a replacement for the horrid little SMPS that has gone bang and won't come back to life, from a Philips DVD963SA?
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Old 2nd September 2011, 08:46 AM   #12
ssanmor is offline ssanmor  Spain
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Hi, it seems you are talking about the very low quality SMPS used in "cheap" consumer equipment. In fact they do fail a lot, I have personally suffered the same problem in at least three DVD players. These products are highly cost-driven and their manufacturers skimp in component quality and design quality a lot, so it is not strange that they fail after a short time. Also, you can look at it as "programmed obsolescence".

I can assure that well designed SMPS using good quality components are very different. With no intention to be pretentious, for example, our coldamp PSUs are used in military applications for 5+ years of continous usage in extreme conditions with no failures. And we are talking about 4x1KW units not small 10W converters like the one you are talking about. Note that these 1KW units are the same that we sell for audio applications, no special components or custom design here.
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Old 2nd September 2011, 11:29 AM   #13
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Hi, yes I accept that milspec units will be much better and careful design can make a huge difference, but most SMPS's are not of that ilk. And these 'consumer' grade types are everywhere, computers, flat screen TV's as well as audio gear.
It's great to hear that you supply top quality gear for HiFi use but you are definitly in the minority.
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Old 2nd September 2011, 11:34 AM   #14
ssanmor is offline ssanmor  Spain
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Thanks, but although this may run against our interests, I am sure that we are not an exception and that there are some other SMPS manufacturers for audio applications that produce units with good reliability, nothing to do with mass-market consumer crap.
So IMHO we shouldn't make general claims against a particular type of technology basing on experiences with particular products of a lower quality level.
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Old 2nd September 2011, 04:31 PM   #15
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I've just been told this afternoon about a Chord amp which apparently has SMPS which went bang recently.
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