Diode Circuit Analysis Techniques Section 4.3. In this Lecture, we will:  Examine dc analysis techniques for diode circuits using various models to describe.

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Presentation transcript:

Diode Circuit Analysis Techniques Section 4.3

In this Lecture, we will:  Examine dc analysis techniques for diode circuits using various models to describe the nonlinear diode characteristics  Determine the operation and characteristics of a half-wave diode rectifier circuits.

Example Simple diode circuit where I D and V D are not known.

Example Problem

Another Approach: Graphical Analysis Technique Simple diode circuit where I D and V D are not known.

Trial and Error Solution of Prior Example Simple diode circuit where I D and V D are not known.

Load Line Analysis of Prior Example The x intercept of the load line is the open circuit voltage and the y intercept is the short circuit current. The quiescent point or Q- point is the intersection of diode I-V characteristic with the load line. I-V characteristics of diode must be known.

Piecewise Linear Model Two linear approximations are used to form piecewise linear model of diode.

Diode Piecewise Equivalent Circuit The diode is replaced by a battery with voltage, V , with a a resistor, r f, in series when in the ‘on’ condition (a) and is replaced by an open when in the ‘off’ condition, V D < V  (b). If r f = 0, V D = V  when the diode is conducting (c).

The x intercept of the load line is the open circuit voltage and the y intercept is the short circuit current. The Q-point is dependent on the power supply voltage and the resistance of the rest of the circuit as well as on the diode I-V characteristics. Q-point

Example Problem

Trial and Error Solution

Load Line Solution

Circuit Simulation Example Circuit schematic Diode voltageDiode current