I read the previous topics about clamper circuits but i am not quite content.
My problem is:
Take a positive clamper circuit for an example. now, starting with the negative cycle. if our voltage source generates 5v sine wave so , during negative cycle diode is forward biased so capacitor will start getting charged. As the charging time of the capacitor is less it gets charged very fast. When the voltage source reaches maximum of -5 v then capacitor is also charged at 5v. Now voltage source's value decrease so for an example it is -3v and capacitor is at 5v . So at the cathode of the diode 5v is there and at cathode there is 3v so it is reverse biased and capacitor doesn't get discharged easily bcoz now it's rc time constant is very large so it almost retain its 5v . Now the reverse biased resistance of the diode is very large so ideally it can be considered open circuited. so when we measure voltage across resistor it should be 2v and then should increase... but instead it remains -0.7 for whole negative cycle. So tell me where am i going wrong? am i lacking some basic concepts?
thank you in anticipation.
Sammie
My problem is:
Take a positive clamper circuit for an example. now, starting with the negative cycle. if our voltage source generates 5v sine wave so , during negative cycle diode is forward biased so capacitor will start getting charged. As the charging time of the capacitor is less it gets charged very fast. When the voltage source reaches maximum of -5 v then capacitor is also charged at 5v. Now voltage source's value decrease so for an example it is -3v and capacitor is at 5v . So at the cathode of the diode 5v is there and at cathode there is 3v so it is reverse biased and capacitor doesn't get discharged easily bcoz now it's rc time constant is very large so it almost retain its 5v . Now the reverse biased resistance of the diode is very large so ideally it can be considered open circuited. so when we measure voltage across resistor it should be 2v and then should increase... but instead it remains -0.7 for whole negative cycle. So tell me where am i going wrong? am i lacking some basic concepts?
thank you in anticipation.
Sammie