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Rectifier Diode High Voltage
Can Diodes be placed without proper resistance?
While looking at circuit schematic of a rectifier, i recalled that i once came across a fine article on diodes that read "diodes offer almost zero resistance to current hence theres a greater possibility that it can burn out at high voltage operation, hence its advisable to use resistors before every power diode" So, does it mean that we should place resistors before diodes or is it just for high voltage operation? if so, how should resistance be matched with every diode?
I'm really confused because the schematics for rectifiers dont show a resistor placed before any of the diodes :-s
The load acts to limit current so in normal application, no resistor is required or desired.
I don't know where that statement came from, but it is false. Unless you misquoted it. For example, this is correct "LED diodes offer almost zero resistance to current hence there's a possibility that it can burn out at higher voltage operation, hence its advisable to use resistors in series with every one"
The resistance is not zero, just low.
edit: the exception is if you put diodes in parallel, you need resistors to equalize the current between them. Usually very small. For example, if you put 5 - 1 amp diodes in parallel, you would use about 0.5 ohms in series with each. You would still not get 5 amps out of it, perhaps 3 or 4.
Diodes in parallel are never recommended as the negative temperature coefficient tends to cause all the current to flow through 1 diode. Vf of a diode goes down by 2mv per degree. If one diode started to use more current, it would get hotter, and it's lower Vf would cause even more current to flow, positive feedback, leading to overheating and distruction.
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High-Voltage Rectifiers Flashing Over
rectifiers? (high voltage)?
how can i make, improvise, or buy a high voltage diode? if so from what/where? any help would b ppreciated!!!! is there any way to combine diodes into a new diode with a higher voltage tolerance? thx!
Yes, you can put diodes in series to add their inverse breakdown voltage. But the diodes must be well matched for this to work. Look for HV diodes on line. the ones over a few thousand volts contain matched series diodes internally.
Search on google for "buy HV diodes" and you will find lots.
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