What is line regulation in Zener diode?
Line Regulation: In this type of regulation, series resistance and load resistance are fixed, only input voltage is changing. Output voltage remains the same as long as the input voltage is maintained above a minimum value.
What happens when zener diode is forward biased?
When forward biased voltage is applied to the zener diode, it works like a normal diode. When reverse biased voltage applied to the zener diode reaches zener voltage, it starts allowing large amount of electric current. At this point, a small increase in reverse voltage will rapidly increases the electric current.
What happens when Zener diode is forward biased?
Why Zener diode is used in reverse bias?
Zener diode is a heavily doped diode. When the Zener diode is reverse biased the junction potential increases. As the breakdown voltage is high this will provide high voltage handling capacity. As the reverse voltage is increased, the reverse current increases drastically at a certain reverse voltage.
What happens when two zener diodes are connected back to back?
When the back-to-back arrangement of identical Zener diodes in series is connected to a DC voltage source, the following occurs: Because the reverse biased diode has the highest impedance, it has the largest voltage drop, which limits the current produced by the forward biased diode (due to Kirchoff’s voltage law).
What is line regulation and load regulation in a Zener diode?
Zener diodes are typically used as shunt regulators, with some sort of current limiting device in the feed side, usually a resistor. Line regulation refers to the amount the voltage varies at the output due to variations in the input voltage (line). Load regulation refers to the change in output in response to load current changes.
What are the characteristics of a Zener diode?
The Zener diode specially made to have a reverse voltage breakdown at a specific voltage. Its characteristics are otherwise very similar to common diodes. In breakdown the voltage across the Zener diode is close to constant over a wide range of currents thus making it useful as a shunt voltage regulator.
How is the output voltage of a DC diode regulated?
Hence a regulated DC output voltage V 0 = V Z is obtained across RL, whenever the input voltage remains within a minimum and maximum voltage. Basically there are two type of regulations such as: In this type of regulation, series resistance and load resistance are fixed, only input voltage is changing.
Which is the upper limit of the Zener current?
There is a minimum zener current for which the stabilisation of the voltage is effective and the zener current must stay above this value operating under load within its breakdown region at all times. The upper limit of current is of course dependant upon the power rating of the device. The supply voltage VS must be greater than VZ.