Explain about zener diodes, Electrical Engineering

Assignment Help:

Q. Explain about Zener Diodes?

Most diodes are not intended to be operated in the reverse breakdown region. Diodes designed expressly to operate in the breakdown region are called zener diodes. A nearly constant voltage in the breakdown region is obtained for a large range of reverse current through the control of semiconductor processes. The principal operating region for a zener diode is the negative of that for a regular diode in terms of both voltage and current. Zener diodes are employed in circuits for establishing reference voltages and for maintaining a constant voltage for a load in regulator circuits. Figure shows the device symbol along with the linearized i-v curve and the circuit model.

1057_Explain about Zener Diodes.png

As seen from the i-v characteristic, a zener diode approximates an ideal diode in the forward region. However, when the reverse bias exceeds the zener voltage VZ, the diode starts to conduct in the reverse direction and acts like a small reverse resistance RZ in series with a battery VZ. Zener diodes are available with values of VZ in the range of 2 to 200 V. The circuit model of Figure (c) incorporates two ideal diodes, Df and Dr, to reflect the forward and reverse characteristics of the zener diode. The i-v curve thus has two breakpoints, one for each ideal diode, and three straight-line segments.


Related Discussions:- Explain about zener diodes

Emi, applications of heterodyne wave analyzer

applications of heterodyne wave analyzer

Low investments in transmission and distribution system, Low Investments in...

Low Investments in Transmission and Distribution System The investment on T&D system in our country has commonly been lower than that on generation. It is hugely believed in

Saturation or active mode, Saturation or active mode While V GS  ...

Saturation or active mode While V GS   > V th  and  V DS   > (V GS   - V th ) The switch is turned on, and a channel has been made that allows current to flow

Solar steam power generator, This project is about another particular appli...

This project is about another particular application of a particular embodiment of the patent: A Long Stroke Steam Engine using Solar Generated Steam. The machine elements such as

Show implementation of synchronous counter using d flip-flop, Q. Consider t...

Q. Consider the synchronous counter shown in Figure of the text. (a) Draw its timing diagram. (b) Show the implementation of the same synchronous counter using D flip-flops.

Design 100 two-motion selectors, Design : Rather than 100 two-motion selec...

Design : Rather than 100 two-motion selectors as in the case of Design 3, let's consider only 24 two-motion selectors. In the case 24 simultaneous calls can be put through the swi

Revenue loss due to loss of opportunity to serve, Revenue Loss Due to Loss ...

Revenue Loss Due to Loss of Opportunity to Serve The revenue loss because of "loss of opportunity to serve" is a extremely relevant but less visible aspect of revenue loss. Gu

Obtain the node voltages and current through each element, Q. For the circu...

Q. For the circuit shown in Figure, develop and execute a PSpice program to obtain the node voltages and the current through each element.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd