That would presumably depend upon how the 4 diodes were connected. I suppose you are thinking that if they were connected such as to effectively double the frequency, then the IEC would probably not regard them as a transformer. I think we are agreed that this IEC definition is totally unsatisfactory!
Well, that's what a full-wave bridge rectifier does.
Indeed.
Strictly speaking the rectified DC has a pulse repetition rate as DC cannot have a frequency.
Exactly - that's obviously why I wrote what I did!
I assumed you would agree!
I agree - but, as I've said, given that I am not naive or arrogant enough to think I can change it, have to acknowledge/accept what has happened (although I, like you, can moan about it from time to time - albeit to no avail!)
Maybe to no avail, but the right thing to do is to always, at every opportunity, tell people that they are wrong.
Well, for a start, there is no point in repeatedly telling the same people that 'they are wrong' - once they have been told once, they've been told. However, whilst it's fair enough to tell them that (in your or my opinion) the situation should never have arisen, to tell them that they are 'wrong' (i.e. that they should be using different vocabulary) might well just produce even more confusion for them. If they went into many (most?) retail outlets and asked for a switched mode power supply (or even just 'a power supply') for their living room lights, I suspect that they would often encounter problems of communication.
Yes but in most usages and especially in electronics the events are identical to each other and occur at regular intervals.
No I am not claiming that. A square wave is not DC
Pulse repetition rate or pulse interval and should include the ratio between ON and OFF
One might, but it would be more reasonable if the IEC had heard (at some point during the last 6 or so decades!) about the development of semiconductors! ....
One also wonders how appropriate it is to talk about power converters, when what is being converted is voltage. I realise that 'power' is used in different senses but, at the least, there is some ambiguity there - which should not really exist in an official definition.IEC said:
Yes, I'm sure that is all true - and if the output is 'high' frequency AC, then the device would clearly not satisfy the IEC definition of a 'transformer'. However, the (seemingly poor) IEC definition doesn't even say that either input or output have to be AC - so an electronic DC/DC converter would technically qualify as a 'transformer'! If the load cannot cope with 'high frequency' AC, I suppose one would have to first create DC at the desired voltage (as above, and then use an inverter (or chopper!) to create AC of the required frequency - and if that frequency were the same as the input frequency (it could even be frequency- and phase-locked to the supply!), we would be back to the situation in which, if one regarded the device as a 'black box', it might be said to satisfy the IEC definition of 'transformer (despite 'internal' frequency conversion).
Maybe - as I've said, who knows! However, as I've just said, I'm more inclined to guess that they would regard the device as a 'black box', in which case, as above, an electronic device might, in some situations, qualify as a 'transformer'.
Go an look at the output of a full-wave rectifier.
Assuming that you want more than simply unidirectional current flow for something to be called DC, then neither is the output from a bridge rectifier. So if you would not claim that a square wave does not have a frequency then you cannot claim that rectified AC does not have one.
Expressed in Hz, by any chance?
Does the output of a traditional domestic dimmer switch not have a frequency?
And at times the seemingly pathological desire for people to redefine existing words because they won't use other existing words which already have the meaning they want annoys me and people of my generation.
Quite - like the output of a full-wave rectifier, you mean?
Not even if it is all on one side of zero voltage?
If your comment relates to its following quote, I would point out that they use the term "electronic valve devices", not "thermionic valve devices". Many semiconductor devices are "electronic valves".
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
