Re: cheap 200A AC to DC power supply?


Fred Bartoli wrote:

Arlet a écrit :
Tony wrote:

If you can insulate the Peltier elements, it would generally be easier
to provide 170VDC at 17A. If the insulation is REALLY good, you could
just rectify and filter the 120VAC, or preferably work up a PFC front
end to provide both regulation and an input current waveform that
doesn't trip out every breaker you connect it to .... or else rethink
the project or the budget.

The filter needs to be pretty good, otherwise the quickly fluctuating
temperatures cause mechanical stresses which severly reduce the
lifespan of the Peltier elements.


That's bollocks. You'll have to have a huge LF ripple to kill your TECs.
Any decently (read not completly screwed) designed PWM supply will give
you as long a lifespan as a DC battery.

That's what I mean. You'll need a real supply, not just a rectifier and
a few big caps.

.

Relevant Pages

  • Re: cheap 200A AC to DC power supply?
    ... If the insulation is REALLY good, ... just rectify and filter the 120VAC, or preferably work up a PFC front ... Any decently designed PWM supply will give you as long a lifespan as a DC battery. ...
    (sci.electronics.design)
  • Re: cheap 200A AC to DC power supply?
    ... If the insulation is REALLY good, ... just rectify and filter the 120VAC, or preferably work up a PFC front ... The filter needs to be pretty good, ... Any decently designed PWM supply will give you as long a lifespan as a DC battery. ...
    (sci.electronics.design)
  • Re: cheap 200A AC to DC power supply?
    ... If the insulation is REALLY good, ... just rectify and filter the 120VAC, or preferably work up a PFC front ... The filter needs to be pretty good, ...
    (sci.electronics.design)
  • Re: Bandpass filter for DC removal and >20kHz noise rejection
    ... also perform some smoothing to reduce high frequencies. ... The reason for ... removing the DC is that I want to rectify the AC component of the ... Yes, you COULD do a bandpass filter, but when the low frequency cutoff ...
    (sci.electronics.design)
  • Re: cheap 200A AC to DC power supply?
    ... just rectify and filter the 120VAC, or preferably work up a PFC front ... The filter needs to be pretty good, ... Ripple is even worst, because the ripple troughs HEAT much more than the ripple peaks COOL. ...
    (sci.electronics.design)