3-Handouts_Handout_2d - Diode Circuits Analysis Graphical...

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Diode Circuits Analysis Graphical Method The intersection of the diode and the resistor current equations is calculated & Gives good understanding to the circuit operation ' Time consuming ' Not suitable for large circuits Analytical Method Both diode and resistor current equations are solved simultaneously or iteratively & Faster than graphical method & More accurate ' Time consuming ' Not suitable for large circuits Diode Models Piecewise-linear diode model is used to replace the diode & Least time consuming method & Suitable for larger circuits ' Accuracy depends on the used model A simple diode circuit. R V V I e I I D S R nV V S D T D = = Equation Current Resistor Equation Current Diode 1
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Graphical Method Step 1 : Locating the Operating Points Step 2 : KVL & KCL Constraints Step 3 : Enforcing KVL & KCL Solution
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Graphical Method (cont.) & Gives good understanding to the circuit operation ' Not suitable for large circuits General Problem Basic Load Line Construction Alternative Construction
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Graphical Method (Example) Problem: Find Q-point Given data: V s =10 V, R =10k
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