Spread time - power semiconductor devices , Electrical Engineering

Assignment Help:

Spread Time (ts)

During  spread time anode  voltage  falls from 10% Ia  to the  on state  voltage  drop  and anode  current  rises  from 90% Ia  to final  value  of anode  current i ,e Ia in this period whole  charges injected from   gate spreads over the entire section of  cathode and anode  current  reaches at steady state  condition.

There the total turn on time  ( ton ) can be written  as

Ton = td + Ir + ts

In these  intervals td tr and ts the rise time is high  a s compared to other. If  rise time it  is reduced beyond  a limit thyrisotr may get destroyed because rate of  rise  of anode  current  may be  large  as compared to the spread velocity of charges and this  may forms a  local  hot spot on the cathode surface of SCR. Turn on  time depends on gate  current. It can be  reduced by using  higher  value of gate  currents.

 


Related Discussions:- Spread time - power semiconductor devices

Show power and power factor in ac circuits, Q. Show Power and Power Factor ...

Q. Show Power and Power Factor in ac Circuits? Power is the rate of change of energy with respect to time. The unit of power is a watt (W), which is a joule per second (J/s). T

Matlab ? uniform quantization, simulate a uniform quantizer that takes as a...

simulate a uniform quantizer that takes as an input a vector of numbers and returns as an output the quantized vector. 1-Generate a random input vector of 10000 samples randomly in

What is 16-bit isa, What is 16-bit ISA? Compare it with 8-bit ISA bus. ...

What is 16-bit ISA? Compare it with 8-bit ISA bus. The only difference among the 8 and 16-bit ISA bus is that other connector is attached behind the 8-bit connector. This 16-bi

Determine the doppler frequency, We are given an M=32 pulse sequence of slo...

We are given an M=32 pulse sequence of slow time data, collected with PRF = 10 kHz.  We want to use a Cooley-Tukey radix 2 FFT algorithms to compute the Doppler spectrum of the dat

Demultiplexer, full sub tractor using demultiplexer

full sub tractor using demultiplexer

Explain the applications of emitter follower, Q. Explain the applications o...

Q. Explain the applications of emitter follower. Because of high input impedance and low output impedance an emitter follower is capable of transferring maximum power from the

Obtain expressions for the open-loop voltage gain, Q. Consider the op-amp c...

Q. Consider the op-amp circuit shown in Figure and obtain expressions for the open-loop voltage gain at (a) low and (b) high frequencies. Also determine relations for the 3-dB poin

Obtain a pos expression, Q. The K map of a logic function is shown in Figur...

Q. The K map of a logic function is shown in Figure. (a) Obtain a POS expression and its corresponding realization. (b) For the purpose of comparison, obtain the correspondin

What is the load resistance in ohms, Q. A 5-MVA, 66:13.2 kV, three-phase tr...

Q. A 5-MVA, 66:13.2 kV, three-phase transformer supplies a three-phase resistive load of 4500 kW at 13.2 kV. What is the load resistance in ohms as measured fromline to neutral on

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