Switching characteristics - power semiconductor devices, Electrical Engineering

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

 

Posted Date: 4/2/2013 7:00:56 AM | Location : United States







Related Discussions:- Switching characteristics - power semiconductor devices, Assignment Help, Ask Question on Switching characteristics - power semiconductor devices, Get Answer, Expert's Help, Switching characteristics - power semiconductor devices Discussions

Write discussion on Switching characteristics - power semiconductor devices
Your posts are moderated
Related Questions
Draw and explain the circuit of feedback amplifier

Analysis Flow Similar to most subjects, the analysis of semiconductor devices is also performed by starting from simpler problems and regularly progressing to more complex one

An angle-modulated signal has the form u(t) = 100 cos [2πf c t+4 sin 2πf m t ],where f c =10MHz and f m = 1 kHz. Determine the modulation index β f or β p and the transmitted s

E n e r gy Band Diagram Energy band diagram in qualitative form is sketched by following the following process: 1. The semiconductor device is supposed to be ma


Q. Show Transformer equivalent circuits? Transformers come in various sizes, from very small, weighing only a few ounces, to very large, weighing hundreds of tons. The ratings


Flow Chart and Cause-Effect Diagram Flow Charts Flow charts are pictorial representations of a procedure. By breaking the procedure down within its constituent steps, f

What is Inductor Inductor, also known as a choke, is another passive type electrical component designed to take benefit of this relationship by forming a much stronger magnetic

Q. Can you give some Overview of Decimal Number System? The Decimal Number System uses base 10 and It includes the digits from 0 through 9. The weighted values for each positio