D1 and D2 are ON (short)
D3 is OFF (open)
My goal is to find a relation between Vin and Vout without using currents in the equation. I thought of applying KVL on a loop that includes the upper wire of the small loop (on which R1 resides), and ended up with:
While a KVL around a loop containing the lower wire of the small loop gives:
-Vin +VB +Vout +Vout=0
Apparently, the two relations are different which is inconsistent. Then I thought about uniting the small loop to be just on one wire then finding a relation between Vout and Vin using KVL. Here I was wondering whether or not R1 and R2 are in parallel. They have one common node on the right of the loop, yet I'm not sure about the left node. The final answer I thought might be right is to do source transformation of (VB and R2) and make them as a (current source in // with R2). This way R1 and R2 will share two nodes and become parallel. Then this small loop will have Req= R1 // R2 and a current source parallel to Req. After that, I can do another source transformation and make my latter small loop as a wire of a voltage source that is in series with Req.
Is my thinking right?