Transformers More
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Transformers More
do switch mode power supplies generate more heat than transformers?
hmm well it depends.:
With electrical devices, the general trend is the bigger they are the more efficient they are. Small transformers are likely to be less efficient that larger ones. Maybe we are talking about 80% copared to 98% or more.
Switchmode supplies can be made to be very efficient, say 98%. The catch is the efficient ones are much more complex. Small ones, like the ones in power adaptors like mobile phone chargers are quite simple, and quite inefficient. Perhaps 50% at best. Larger ones (100 watts or more) can easily have 90% efficiency. Even larger ones can exceed this. There are 'swtich-mode supplies' that connect HV DC transmission lines (eg. Basslink http://en.wikipedia.org/wiki/Basslink ). These must handle hundreds or thousands of megawatts of power. Even 99% efficiency then would mean loss and heating of more than 1 megawatt! So these must be designed to be very efficient (needless to say they are very complex! Sometimes with fancy laser triggered thryristors!)
Similar arguments apply to transformers: once they are 'big enough' they have very high efficiency, and small ones less so. A 5VA transformer would probably be luck to have 60% efficiency, a 1KVA could eaily be 95%. A 50MVA might exceed 99%. How efficient a transformer is depends on the quality of the core material, the amount of core material and the amound of copper. You could almost estimate it by weighing!
Perhaps transformers can be esily made more efficient than switchmode power supplies, but the trade off is cost and mass: a 1kVA 99% efficient transformer will be heavy (say 5kg) and expensive. A 1kW switching supply 85% efficient would be light (say 500g or less!) and cheap (maybe 1/2 the cost).
Dead Island Movie, Transformers, Spiderman & More! (ep. 315)