We already learned about the simple diode which is a very useful electrical component. The simple diode is widely used to rectify ac to dc. Besides normal diode, there are two special purpose popular diodes namely the Schottky diode and the Zener diode. Let’s understand their basics:
The Schottky diode has very small conduction losses. Its features are:
- Very small power loss: In case of the Schottky diode, the voltage drop is very small and the power losses are also very small. They are useful for reverse voltage protection.
- High-frequency devices: A normal diode can perform well for frequencies under 1 kHz but it is not recommended for frequencies above than that. A Schottky diode, on the other hand, can work for frequencies as high as 1.2 MHz.
One of the disadvantages associated with Schottky is that its blocking voltage is low as compared to the common diode and reverse leakage current can rise to a higher voltage.
Zener diodes are used in reverse biased configuration to achieve forward voltage drop that is equal to its Zener voltage using this we can achieve a voltage regulator.
The working of Zener is identical to the usual diode in forward biasing. Practically a Zener diode is employed is rever biased fashion to obtain a reverse voltage that is equal to its Zener voltage. It can be practically used to clip voltage at the gate of Mosfet. It can also be used by using two of them so as to clip the positive and negative waves.
Let’s watch this video to learn more about them:
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