Load-Line Analysis of Complex Circuits with small signal diode model

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Presentation transcript:

Load-Line Analysis of Complex Circuits with small signal diode model * Use the Thevenin Equivalent

Question Find the power dissipated by the diode assuming that we use small signal diode model.

Cct. Models for semiconductor diodes Diode Models Large Signal Small Signal Piecewise Linear Ideal Diode Offset Diode

Piecewise linear Diode Model For this model we assume the following: Cutoff frequency >0 Internal resistance (rD) >0 (but constant!!) Reverse current =0. The approximation mainly in the value of the internal resistance.

Piecewise-Linear Diode Models Now, diode voltage is the sum of resistance voltage and cutoff frequency voltage.

Other Diode Types (Zener Diode ) Reverse Bias Piecewise Linear Model Zener symbol Operates in the reverse mode. Constant voltage with varying current (at break down voltage) Can be used as avoltage regulator. (VBR)

Example – Zener-Diode Voltage-Regulator Circuits

Example