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Electronics and Electrical Engineering Design Forum

 

Passives

What is voltage across A and B?

Capacitor is fully charged to given volt in figure. Then v2 is applied. What can be Vab?

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prajanayam@yahoo.com
Asked By:
prabhu Raj
1 year ago
 
 
{username}
Score: 0

assuming v2 is initially off and the capacitor is at voltage (V+V1), then the voltage Vab = V2 + (V+V1) = V2 + Vdiode

if we assume V > 0, V1 > 0 and V2 > 0, then Vab = V2 + (V + V1) which is always greater than V1, so the diode never turns on.

at least this is what i’m thinking. seems like the problem has a few different cases of operation depending on the values of these voltages.

» Reply
 
{username}
Score: 0

Vab= (V+V1)+V2=V1-Vdiode

If; (V+V1)+V2 = 9V and

V1-Vdiode= 6V

then; Vab= 9V . Both are connected in parallel.

If; (V+V1)+V2=6V and

V1-Vdidoe=9V

then; Vab=9V

» Reply
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