![]() ![]() The force from this junction will frees electron from its covalent bond and moves those free electrons to conduct the band. This will result in a force of attraction on a negatively charged electron across the junction. When the reverse voltage is increased across the PN junction diode, then the electric field across the diode junction increases. The voltage that Zener diode drops across itself will not continue to increase. Once the voltage across a Zener reaches the breakdown voltage, it is said to be Zener diode’s Zener voltage VZ. This used in the application of voltage regulation. This current is called avalanche current. The moment it hots the breakdown voltage, the current increases suddenly. Leakage current is also called as small current which will be flowing through the diode. Initially, when receiving reverse voltage, the current is very small. In this region diode will be in reverse bias. Here, Zener diode receives positive voltage across its cathode to anode terminals. Now the left side characteristic curves are also equally important. In this period the current is very small for a while until it spikes exponentially up once the voltage reaches a particular point. In this region the diode is forward bias. In the figure right side of the characteristic curve represents the Zener diode receives forward voltage, which is positive voltage across anode to cathode terminals. The V-I characteristic curve of Zener diode is shown below. Zener diode characteristics mainly deals with voltage across a Zener diode varying along with the current through it. Zener Diode Symbol Zener Diode Characteristics But it’s the additional application which makes distinct from normal diode is it will permit current to flow in the reverse direction when its Zener voltage is reached. Zener DiodeĪ Zener diode is similar to the normal diode which allows current to flow from anode to cathode. To limit the drop of the voltage Schottky diode is required. ![]() ![]() Drop in the voltage will result in the reduction of the efficiency of the diode. Solar cells do not reverse the charge applied to it and therefore a diode is required in series with the solar cells. When the solar cells are connected to rechargeable batteries, often lead acid batteries this is because it may require 24 hours a day and the sun is not always available. Used in the applications where a load is driven by two separate power supplies. Its high current density and low forward voltage drop means that less power is wasted than an ordinary PN junction diode. It has high switching speed and high frequency capability. In very small active area, often as a result of using wire point contact onto the silicon, the capacitance levels are very small. ![]()
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