freewheel diodes ?
freewheel diodes ?
(OP)
would someone please explain the term freewheeling diodes
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RE: freewheel diodes ?
It comes into play when the switch (mechanical or transistor) opens. Since current in an inductor cannot be interrupted immediatley, a very high voltage spike would occur and probably arcing across the switch if the diode were not there.
The diode presents a path for the coil current when the switch opens and the coil current decays (slowly) to zero. The use of a Free-wheeling diode can delay the release of the magnetic system from a few milliseconds up to seconds (especially large valves in hydraulics can be a problem). There are ways to decrease the delay. There are also other means than diodes to avoid overvoltage and arcing.
RE: freewheel diodes ?
RE: freewheel diodes ?
RE: freewheel diodes ?
RE: freewheel diodes ?
Imagine a thousand horses running through your farm gate, half way through, you decide to slam the gate shut? the horses will destroy it!!!
Now imagine using those circular doors you go through at the hotel that's divided into 4 pieces, when you close off the entrance, the horse run half a circle and come back out.=)
RE: freewheel diodes ?
RE: freewheel diodes ?
RE: freewheel diodes ?
http://www.ipes.ethz.ch/ipes/dcdc/e_Buck_3.html
RE: freewheel diodes ?
Nice applet, BTW. (Added to come back on topic again)
RE: freewheel diodes ?
thanks lads for your replies you have restored my faith in human nature