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In Reply to: Re: understanding switching PS.. posted by Tweekeng on November 27, 2005 at 11:14:55:
hi Tweekeng,Tks for the wonderful lead and your kind explaination! Yes I forgot the basic physics, I think in my Electro-magnetic wave class we did discuss about transmission effect up to wave propagartion in 2 parallel conductor... so too high a freq will lead to capacitive leak and radiation leak(yes?). Anyway, I really don't know enought about power transmission, perhaps teh current solution of high voltage/low current transmission from the power company is already the best solution, but may be in the house in most outlets there will be programmable output voltage and freq and most home appliance will be plug and play with out adaptors inside..??
Anyway, my interest is to try to build a lower freq converter, to convert our 110V/240V into 400V max 500ma with perhaps 500 c/s sine wave, as an experiment for the power supply of an OTL tubes amp, with smaller transformer...
Can this be done reasonably easily?
Tks and best rgdsWilliam Lee
Follow Ups:
So lt me get this straight, you want to build a 400Vac@500Hz switchmode inverter to power an amp so you can use a smaller power transformer and filter caps on the amp?It would seem to me that would be a lot more trouble than it needs to be. Why not just build a decent DC switchmode power supply to replace the one in the amp?
He wants first to convert 60Hz into DC like in switching supply, then instead of using PWM or square wave to drive output, he would like to use sinewave HF 40kHz or so, to drive output device. So instead of PWM he wants to use AM for output stage, or no modulation if it is not regulated output. This is OK to do, but you still get same bad things as with PWM switching supply + one more... alot of heat.
Just want to learn about sine wave power supply. Is the the conventional type? there are sine wave inverter available and the price is not too bad too... I got one last year but yet to use. perhaps I will open it up and see if I could find out some thing!tks and best rgds
William Lee
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