Diode rectifier circuit - prevent overcurrent damage to a diode (Shorebrook PE Exam Question 46)

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akyip

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Hi guys,

Regarding preventing overcurrent damage to a diode, I understand the reasoning behind using a 2nd diode in parallel (to divide the current).

But is there a reason why adding resistors to the diode branch is not an appropriate solution to reducing current? Is because of resistor I^2 * R losses? The solution in Shorebrook PE Power Exam Question 46 does not elaborate on this.

Thanks!

Shorebrook PE Exam Question 46.jpg

Shorebrook PE Exam Solution 46.jpg

 
He's assuming the current is a constant current source. Therefore, a resistor would only affect the voltage drop, it would not reduce the current through the diode.

 
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