modified 9 years ago

How does this happen

01:29:31

What just happened 

published 9 years ago

sircube

9 years ago

The junction of the diode has a parasitic capacitance, and with that high frequency it has a low impedance and it allows current to flow both ways. Try to decrease this capacitance and you will see that the current decreases.

jpoulin0901

9 years ago

Your source voltage is also too low to forward bias the diode so the junction capacitance is chiefly responsible for any current being allowed through this circuit. That is to say the diode impedance consists solely of its capacitive reactance.

jpoulin0901

9 years ago

And its ohmic resistance too i suppose.

justinmh

9 years ago

Look up diodes reverse recovery time, or t_rr, basically the frequency of the input power supply is too high and the diode never gets a chance to shut off and block the reverse current. This can be avoided by decreasing the frequency of the power supply. In real life you would use a Schottky diode, which doesn't have a t_rr, because it is instantaneous... for the most part... in some instances, very rare, and nothing the average joe can replicate, they don't close, but don't worry about that.

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