Delay time - power semiconductor devices , Electrical Engineering

Assignment Help:

Delay time ( td)

Initially a thyristor  remains  in forward  blocking  stat when  anode to cathode forward  voltage  is applied  and gate  to cathode circuit is opened. As the gate to cathode voltage  is applied  a small forward  leakage  current flows. Delay time is the time during  which anode  current  rises  form forward  leakage current  to 10% of Ia  when gate  current is  reached 90% of Ig where Ia  and Ig  are the final  value  of anode  and gate  current  respectively. As the anode  voltage falls  from  Va to 90%  of Va where Va is the initial  value of anode  voltage.

Since  the gate  current  has non  uniform  distribution of current  density over the cathode  surface Ig is much  higher  near the gate and its value  decreases rapidly as the  distance from the  increases.


Related Discussions:- Delay time - power semiconductor devices

Determine the signal at the receiver output, Q. An FM station's modulator h...

Q. An FM station's modulator has a sensitivity k FM = 5π × 10 4 rad/s·V. A receiver uses a discriminator that has a gain constant of 10 -5 /π V·s/rad. Neglecting noise, determin

Determine the load - thevenins equivalent circuit, Determine the load - The...

Determine the load - Thevenins Equivalent Circuit: Determine the load for which the source shall transfer the maximum power if load is connected across the terminal A and B, u

What is ohmmeter, What is ohmmeter An ohmmeter is an instrument for mea...

What is ohmmeter An ohmmeter is an instrument for measuring resistance

Modern physics, jsidjsiod dkndkdisd dknssbs bsjbabd asj u dhihf ujojdsajfs...

jsidjsiod dkndkdisd dknssbs bsjbabd asj u dhihf ujojdsajfs sjssaidhsidw idgsdusadidjwap ewkeowr krwnrh bwvr [ wrj wrj 1 nnwoi khiwrjw ko e woewerijr rjwr jr rjhpr

Determine the maximum value of the voltage, Q. Three waveforms seen on an o...

Q. Three waveforms seen on an oscilloscope are shown in Figure. If the horizontal scale is set to 50 ms per division (500 ms for the entire screen width), and the vertical scale is

Show principal source of energy, Q. Show Principal source of energy? Th...

Q. Show Principal source of energy? The principal source of energy comes from the burning of fossil fuels such as coal and oil to generate steam, which drives steam turbines, w

Compute the electrostatic potential solution, Figure shows the cross-sectio...

Figure shows the cross-section of an electrostatic problem with translational symmetry: a rectangular coaxial cable. The inner conductor is held at 10 volts and the outer conductor

Basic features of electricity and circuit, 1.   Describe the basic featur...

1.   Describe the basic features of electricity at a fundamental level ? (to achieve a pass grade, explain the nature of electricity) 2.   What part of a cable are conduc

Demagnetizing and cross magnetizing effects , Q.   What do you understand b...

Q.   What do you understand by demagnetizing and cross magnetizing effects of armature reaction in a d.c. machine. Derive the expression for calculation of demagnetizing and cross

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