In some cases, excess current flows through a circuit and damage the multimeter. Analysis and measurement of a zener diode voltagereference. Zener diode working with circuit diagram and applications. Scribd is the worlds largest social reading and publishing site. In reverse bias, a negligible constant current flow through the zener diode but the current becomes abruptly large at certain voltage. The symbol of zener diode is similar to the normal pn junction diode, but with bend edges on the vertical bar. When the diode is connected in forward bias diode acts as a normal diode. The major role of a zener diode is to function as a voltage regulator. We operate a zener diode in reverse biased conditions, and this diode does not get damaged even when the voltage across this exceeds the reverse breakdown voltage. The breakdown potential, also called the zener potential i. The zener diode varies in a wider range based on its mounting location.
This post includes explanation of operation of zener diode and vi characteristics of zener diode. The breakdown voltage of a zener diode can be set by controlling the doping level. The zener regulator is composed of resistor r1 and zener diode cr1 the resistor characteristics. In this lesson we define the zener diode and describe its characteristics. The above diagram shows the vi characteristics of the zener diode behavior. When the reverse bias voltage is greater than a predetermined voltage then the zener breakdown voltage occurs. The vi characteristic of zener diode indicates that characteristic of zener diode in forward bias is same as pn junction diode.
It is fairly employed in many electrical and electronic tools and equipments. But for simplicity, both types are called zener diodes. The limiting maximum power for a zener diode is given by p zv zi zmax and is a function of the design and construction of the diode. The heart of the zener voltagereference is shown in the. For zener diodes, silicon is preferred to ge because of its high temperature and current capability.
Reverse biasing will generally not cause current conduction until higher values of reverse voltage are reached. The characteristics of a regular junction diode will show that it is designed primarily for operation in the forward direction. The zener diode is a particular type of diode that solves this problem. Zener diode is significant to use in breakdown region.
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