The "ideal diode model" and the "practical diode model" are two different ways of representing the behavior of a diode in electronic circuits, each with its own level of simplification and accuracy. Here's a brief explanation of the differences between the two:
Ideal Diode Model:
The ideal diode model is a theoretical representation of a diode that assumes it behaves perfectly under all conditions. It simplifies the diode's behavior to the following key characteristics:
Zero forward voltage drop: In forward bias (when the anode is at a higher voltage than the cathode), an ideal diode has zero voltage drop across it. This means that current can flow through the diode without any resistance.
Infinite reverse resistance: In reverse bias (when the cathode is at a higher voltage than the anode), an ideal diode has an infinite resistance. This implies that no current can flow in the reverse direction.
The ideal diode model is very useful for understanding the basic principles of diodes and analyzing simple circuits. However, it is an idealization and doesn't fully represent the real-world behavior of diodes.
Practical Diode Model:
The practical diode model, also known as the "piecewise linear diode model," is a more realistic representation of a diode's behavior. It takes into account some of the non-ideal characteristics of real diodes:
Forward voltage drop: In practical diode models, a small forward voltage drop is considered when the diode is in the forward-biased state. The value of this voltage drop varies depending on the type of diode (e.g., silicon diodes typically have around 0.7 volts forward voltage drop).
Reverse leakage current: In reverse bias, a small amount of current, known as reverse leakage current, may still flow through the diode. This current is significantly smaller than the forward current and depends on the diode's construction and material.
The practical diode model provides a more accurate representation of diode behavior in real-world circuits, making it suitable for more complex circuit analysis and design.
In summary, the ideal diode model simplifies the diode's behavior to only two states (on and off) and assumes perfect behavior, while the practical diode model introduces additional elements, such as forward voltage drop and reverse leakage current, to better represent the real characteristics of diodes in circuits.