Power Supply Smoothing without Capacitor?
Power Supply Smoothing without Capacitor?
(OP)
I posed this question to some of my electronics engineering colleagues and they couldn't really offer a good answer. Can anyone theorize what might be a possible way for smoothing a rectified AC waveform to DC without the use a capacitor?? Basically how can this be achieved with the use of conventional electronics components without a capacitor?





RE: Power Supply Smoothing without Capacitor?
Some regulators could probably pull it off by using an accompanying inductor. I know I've seen LED drivers that boasted "no capacitors needed".
Keith Cress
kcress - http://www.flaminsystems.com
RE: Power Supply Smoothing without Capacitor?
RE: Power Supply Smoothing without Capacitor?
Otherwise, there is no there, there. Even assuming you could come up with a flattened output voltage without storage elements, the output would droop under load, since it's the storage elements that not only reduce ripple, but also redistribute the available power throughout the AC cycle so that the output voltage doesn't droop under load.
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RE: Power Supply Smoothing without Capacitor?
Motor-Generators (AC in, DC out) don't need capacitors.
RE: Power Supply Smoothing without Capacitor?
RE: Power Supply Smoothing without Capacitor?
Darrell Hambley P.E.
SENTEK Engineering, LLC
RE: Power Supply Smoothing without Capacitor?
Dan - Owner
http://www.Hi-TecDesigns.com
RE: Power Supply Smoothing without Capacitor?
VE1BLL has an interesting point in saying that a motor-generator doesn't need a capacitor. It is correct, in a way, but not correct if you need a low DC source impedance. You still need capacitors to take care of switching transients.
Another interesting point is that the equivalent diagram for a (PM) DC motor is the same as for a capacitor. And the same differential equations apply.
Gunnar Englund
www.gke.org
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RE: Power Supply Smoothing without Capacitor?
You get a reasonably low ripple DC output without filter capacitors that is perfectly suitable for many uses when you run 3-phase through a phase shifting transformer to a 18-pulse or 24-pulse rectifier.