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

Determine the expected voltage levels at the output, The subsequent voltage...

The subsequent voltage-source multiplying DAC is to be utilized to convert the digital data stream "11" and "01" to an analog signal.  It has 2-bit inputs and hence is capable of c

What is the difference between tdma and fdma, TDMA: Time division multi...

TDMA: Time division multiple access (TDMA) is a channel access method for shared medium (generally radio) networks. It permits several users to share the similar frequency chan

Transfer function, how can i do a question concerning a transfer function

how can i do a question concerning a transfer function

Charge and electric force, Charge and Electric Force The proton has a c...

Charge and Electric Force The proton has a charge of +1.602 10 -19 coulombs (C), while the electron has a charge of -1.602 × 10 -19 C. The neutron has zero charge. Electric c

Disadvantages of software defined radio, Disadvantages of SDR 1. Power ...

Disadvantages of SDR 1. Power consumption is more due to rapid switching of modes 2. Hardware design is not easy 3. Software bugs exist in the system

Briefly explain automotive ignition system, Q. Briefly explain Automotive I...

Q. Briefly explain Automotive Ignition System? Ignition systems in automobiles have been designed as a straightforward application of electrical transients. Figure shows a simp

Define instruction cycle, Define instruction cycle and T-state Instruct...

Define instruction cycle and T-state Instruction cycle is defined, as the time needed completing the execution of an instruction. Machine cycle is defined as the time needed co

Determine the output voltage, Q. In a differentiating circuit, R=10 kW,and ...

Q. In a differentiating circuit, R=10 kW,and C=2.2μF.If the input voltage goes from 0V to 10 V at a constant rate in 0.4s, determine the output voltage. Solution: e 0 =

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