Switching characteristics - power semiconductor devices, Electrical Engineering

Assignment Help:

Switching characteristics

When  a positive signal  is applied GTO starts  conducting before  initiation of  conduction anode  current  is zero  and anode to cathode voltage Vak is the peak reverse voltage. When conduction starts anode  current  rises from  to full value  and the anode to cathode voltage Vak becomes very small when a negative gate signal is applied the anode current  becomes  zero and  the Vak  rises to peak revise voltage. The  total turn OFF  time can be  divided in three  distinct times storage time   fall time and tail time the switching characteristic of a FTO  is shown  in figure.

As soon  as negative gate  signal  is applied turn OFF  process starts  immediately. The  time  clasping between  application of  negative gate  current  till this current  reaches its  negative  peak value known  as storage time. During  this period the  excess charges are removed by the negative gate current and GTO gets ready to  turn OFF. During  fall time  tf the anode current decrease rapidly and anode to cathode voltage rises. This  time tf in most GTO  is about at  the end to tf the current falls  slowly to zero value during tail time  tf.  At  the end to the tail time  the anode current  Ia becomes  zero  and Vak  becomes  equal  to peak reverse voltage.

There  are many  advantages and disadvantage of GTO over thyristor some advantages of GTO  are as follows:

a.Commutation circuit is not  needed

b.Fast switching  speed

c.More di / dt at turn  ON

d.Higher efficiency because losses in commutations circuit is eliminated

e.Circuits using GTO  are compact

f.Lesser acoustical and electromagnetic noise  due to  elimination  of choke  of commutation

 


Related Discussions:- Switching characteristics - power semiconductor devices

Calculate the cross-sectional area, Calculate the cross-sectional area, in...

Calculate the cross-sectional area, in mm 2 , of a piece of aluminium wire 100 m long and having a resistance of 2Ω. Take the resistivity of aluminium as 0.03 x 10-6 Ωm.

Energy gap, Energy Gap Differentiating feature between the metals, ...

Energy Gap Differentiating feature between the metals, insulators, and semiconductors. Ascertains the absorption or emission spectra, the leakage current, and the intrin

Clampers., hint on clamping as a project topic

hint on clamping as a project topic

Common-drain jfet amplifier, Q. Common-Drain JFET Amplifier? Figure (a)...

Q. Common-Drain JFET Amplifier? Figure (a) shows a CD JFET amplifier in which resistors R 1 , R 2 , and R SS are selected by the bias design, and capacitors CG and CS are chos

Actual voltage reading in decimal, Prepare the assembly code to make a Digi...

Prepare the assembly code to make a Digital Volt Meter that shows the message and the correct voltage on the LCD. Once you managed to display the hex value for the conversion you w

Lc filter, LC Filter To the load resistance R L the ripple factor i...

LC Filter To the load resistance R L the ripple factor is directly proportional in the inductor filter and inversely proportional to R L in the capacitor filter. Hence i

Obtain the truth table for the logic block, Q. Obtain the truth table for t...

Q. Obtain the truth table for the logic block shown in Figure

Use of a k map simplify the following boolean expressions, Q. With the use ...

Q. With the use of a K map, simplify the following Boolean expressions and draw the logic diagram.

Explain sar instructions in 8086 family, Explain SAR instructions in 8086...

Explain SAR instructions in 8086 family with example and their effect on flag. SAR: Shift each bit of operand right through given number of bits, this instruction shifts eve

Determine the capacitor and inductor voltages, Experiment • Wire the circu...

Experiment • Wire the circuit shown in Figure. Connect the three oscilloscope channels as shown in Figure. • Select the sinusoidal waveform. Adjust the frequency of the input volt

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