Static v- i characteristics - power semiconductor devices , Electrical Engineering

Assignment Help:

Static V- I Characteristics

A thyristor  works in  three basic  modes

a.Reverse  blocking mode

b.Forwards  blocking  mode and

c.Forward  conducting  mode

In reverse  blocking  mode cathode is made  positive  with respect to anode  and gate  circuit  remains  open as shown  in figure  in this  mode junctions  J1 and J3 are seen  to be reverse  biased and junction J2 is forward  biased. A very  small  current  flows.

1517_Characteristics.PNG

                             Figure(a) reverse blocking  mode (b)forwards blocking  mode  (c)forward  conducting mode

An avalanche breakdown  occurs  at junction J1 and J3. When  reverse voltage  is increased and  reverse  current  increase  rapidly  as shown in figur.

In forward  blocking  mode anode is positive  with respect to cathode and gate is  opened. Since  the junctions J1 and J3 are forward biased whereas junction J2 is reverse biased. Hence  a small  leakage current  flow  called forward  leakage  current. When  forward  voltage  is increased junction J2 will have  avalanche  breakdown  at a  voltage named forward  break over voltage  vBo.  

In  forward  conduction mode  anode  is made  positive with  respect to  cathode  and gate is  also made  positive with respect  to cathode. As positive  gate  voltage  is applied   between gate and  cathode at a particular  forward  anode  voltage junctions  J2 comes in  forwards bias  from reverse bias  condition and a  forwards anode  current flow  in the  circuit  with very small  voltage drop  across  the thyristor.

 


Related Discussions:- Static v- i characteristics - power semiconductor devices

Explain node-voltage and mesh-current analyses, Explain Node-voltage and me...

Explain Node-voltage and mesh-current analyses? The node-voltage and mesh-current methods, which complement each other, are well-ordered systematic methods of analysis for solv

3-phase 3 wire meter, 3-Phase 3 Wire Meter A 3-phase 3 wire meter has ...

3-Phase 3 Wire Meter A 3-phase 3 wire meter has 2 elements of each category on the other hand of 3 elements as in the case of 3-phase 4 wire meter. The primary principle of op

Communication systems/theory, have 18 multiple choice questions i need answ...

have 18 multiple choice questions i need answered by 9am cst and will pay Need ASAP

Explain pnp transistor circuit, Explain pnp transistor circuit . pnp tr...

Explain pnp transistor circuit . pnp transistor: A transistor consist of  three terminals. In this pnp transistor there is two blocks of p- type semiconductors that are separa

Components in a microprocessor, What are the basic components in a Micropro...

What are the basic components in a Microprocessor? 1) Address lines to refer to the address of a block 2) Data lines for data transmit 3) IC chips 4 processing data

What is thermal runaway, Q. What is thermal runaway. The problem of sel...

Q. What is thermal runaway. The problem of self heating arises due to dissipation of power at the collector junction. The leakage current ICBO is extremely temperature dependen

Analog, why h parameter used in low frequency transistor amplitfier

why h parameter used in low frequency transistor amplitfier

Transistor, Transistor A transistor is a semiconductor device that is ...

Transistor A transistor is a semiconductor device that is employed to amplify and switch electronic signals. It is made up of a solid piece of semiconductor material, with min

ERT, What are the applications for solar PV system? Explain one of the appl...

What are the applications for solar PV system? Explain one of the application with neat schematic diagram.

Find the current by means of mesh-current analysis, For the network shown i...

For the network shown in Figure, find the current delivered by the 10-V source and the voltage across the 3- resistor by means of mesh-current analysis.

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