Analysis of Diode Circuits using the Ideal Diode Model

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Presentation transcript:

Analysis of Diode Circuits using the Ideal Diode Model Determine the state (on or off) of D1 and D2. Recall -- Forward Bias: VA > VK, short circuit Reverse Bias: VK > VA, open circuit

Start by assuming diode states Assume D1 is OFF and D2 is ON. The current through D2 flows from anode to cathode  The anode voltage D1 is 10V, and the cathode voltage is 3V. This means D1 is actually forward biased and should be ON. 

Let’s try again Assume D1 is ON and D2 is OFF. The current through D1 flows from anode to cathode  The anode voltage D2 is 3V, and the cathode voltage is 6V. This means D2 is indeed reverse biased and is OFF.  So D1 is forward biased (ON) and D2 is reverse biased (OFF).

Let’s try some more!

Let’s try some more!

Let’s try some more! OFF ON VA VK

Full-Wave (Bridge) Rectifier

Full-Wave (Bridge) Rectifier Positive Half-Cycle:

Full-Wave (Bridge) Rectifier Negative Half-Cycle:

Full-Wave (Bridge) Rectifier Iload

Full-Wave (Bridge) Rectifier What happens when a diode fails? (Diodes always fail as OPEN circuits)