In a typical filter circuit involving a filter cap. we see ripples being generated..i.e capacitor starts discharging (as if there were no external power supply), in the decreasing half of each half cycle.This can happen only if the voltage across the diode drops to something below its barrier potential.But assuming a straightforward approach, why isnt the charge profile of the capacitor similar to that of the voltage output?In most books, its starts with the cap. discharging(its never highlighted why) and then because the rate of change of voltage across the cap is less than the external power supply, the diode is off.its never mentioned that only because the diode becomes reverse biased that the cap. starts discharging like in the absence of a power supply.WHY SHOULD THE DIODE TURN OFF IN THE FIRST PLACE?
this thing has been haunting me for over a week, havent found a satisfactory answer.
this thing has been haunting me for over a week, havent found a satisfactory answer.