Discussion in 'General Electronics Chat' started by TL314, Apr 14, 2015.
What would be some effects caused by an non-ideal rectifier?
Exponential increase in current for small increase in forward voltage.
Is this for homework?
Homework questions go in the homework section. Just a general question.
It's a hard thing to explain cause it depends on to many factors like the filter cap size ,age,esr and that's only one part ..
it wouldnt perfectly block current in one direction and transmit current in the other direction right?
I would say a non-ideal diode (i.e., a real-world diode) would differ from an ideal diode in that it would show unit-to-unit variations in forward voltage and reverse current, as well as departures from the I/V characteristics predicted by theory. Most of these would be due to process variations and variations in the purity of the raw materials.
On the other hand, you could say a non-ideal diode differs from an idealized diode in that it has any forward voltage drop at all, and leaks any reverse current at all.
It all depends on what you mean by "ideal."
There is also capacitance across the real junction, reverse recovery time, and the heat that is caused by the current...if I didn't repeat anybody.
Let's not forget the voltage drop, and associated power loss.
Ah, I see the previous posts already address this.
One really excellent resource for understanding the multifarious "non-ideal-ness" of all kinds of components is a book by Robert Pease, Troubleshooting Analog Circuits. Pease discusses all the quirks and foibles of resistors, capacitors, inductors, diodes, transistors, LEDs, opamps, comparators and sundry other ICs. The book is a bit pricey, but worth EVERY penny because it's simply chock-full of practical information.
How about just download any datasheet for any diode and expect that every specification listed is describing some characteristic that is not ideal?