I tried to analysis the nodes. I put the voltages to every node and tried to understand how does this circuit will act but i couldn't figure it out. Seems like there will be no current on D4 or D2 but actually there must be to complete the circuit. I think i need to study more on the diodes but i'm trying to figure out this circuit.But what part of this question confused you the most? Also try to show us your work.
Under what conditions would this be the case?Seems like there will be no current on D4 or D2 but actually there must be to complete the circuit.
Oh thanks for your answer. I think i solved it now.All I can say is that for a positive voltage at Vo. Current want to flow through the diodes in this path:
View attachment 138656
D1 and D2 diode will start conduct only if the anode voltage is 0.7V larger than the cathode voltage. And for the Zener diode (D5) the cathode voltage needs to be larger than the Zener voltage.
Think again.I think i solved it now.
Opps This time i change my solution. Since zener diode's voltage is constant. And actually i couldn't understand what you meant with when voltage drop isn't 0.7 V and impedance because usually we neglect change of voltage drop and resistance of diode. Am i wrong ?Think again.
How did you get the equation for I?
You should get into the habit of including units in your work.
How are you supposed to calculate Vz when Iz isn't 10mA?
How are you supposed to do the calculations when the diode drop isn't 0.7V and their impedance isn't 30 ohms?
We usually assume a forward voltage for the diodes and ignore their resistance. After initial calculations with the assumption(s), we iterate as necessary to obtain the solution. In some cases, not many, we can ignore the voltage drop of diodes.And actually i couldn't understand what you meant with when voltage drop isn't 0.7 V and impedance because usually we neglect change of voltage drop and resistance of diode.
The problem is that the problem doesn't give the information needed to model the zener this way. It gives the the voltage and current at ONE point and no information about which to establish either the voltage and current at another point on that operating segment or the slope of that segment.To solve this problem the piecewise linear model for a diode will be good enough.
http://www.ittc.ku.edu/~jstiles/312/handouts/The Piecewise Linear Model.pdf.
Another seemingly poorly crafted question when taken without context. If we knew what the OP had already been taught and what they're supposed to be learning now, we might understand what assumptions are being made and it would make more sense.The problem is that the problem doesn't give the information needed
Agreed.Another seemingly poorly crafted question when taken without context. If we knew what the OP had already been taught and what they're supposed to be learning now, we might understand what assumptions are being made and it would make more sense.
by Jake Hertz
by Jake Hertz
by Aaron Carman
by Aaron Carman