parallel operation of MOSFET can be done more easily as compared to thyristor. why?

1 Answer

 
Parallel operation of MOSFET can be done more easily as compared to thyristor because the resistance of MOSFET is increases with increase in temperature. MOSFET have the positive temperature coefficient. In positive temperature coefficient, the resistance increases with increase in temperature and in case of negative temperature coefficient resistance decrease with increase in temperature. Due to the positive temperature coefficient of MOSFET if we connect MOSFET in parallel and if the current in particular MOSFET increases then due to losses the temperature in that particular MOSFET will be increased. This increase in temperature will also increase the internal resistance of that particular MOSFET, therefore, the current in that particular MOSFET will also decrease this thing will balance the current in MOSFETs.

But in case of a thyristor which is a negative temperature coefficient device. So due to negative temperature coefficient, the resistance in the thyristor will decrease when the temperature of thyristor will increase this causes more current to flow due to low resistance.Hence the parallel operation of MOSFET can be done more easily as compared to the thyristor.
Like 0 like Dislike 0 dislike

Related

Description : Explain the series and parallel operation of MOSFET. Which is suitable and why?

Answer : Series operation of MOSFET: To increase voltage handling capability MOSFETs are connected in series. When the MOSFETs are connected in series each MOSFET should turn on and turn off ... on and turn off time and transconductance. Each MOSFET should share current equally.  

Description : An additional condition for parallel operation of three-phase transformers over single-phase transformers is that

Answer : An additional condition for parallel operation of three-phase transformers over single-phase transformers is that the transformers should belong to the same vector group

Description : Also, highlight the problem faced during parallel operation.

Answer : Parallel operation of IGBT: Parallel operation of IGBT is done for obtaining high current rating. Paralleling of IGBT reduces conduction losses and thermal stress. IGBT combines the qualities of ... . IGBTs must share losses equally otherwise IGBT may get failure due to thermal differences.

Answer : For the parallel operation of two or more D.C. compound generators, we should ensure that series fields of all generators should be either on positive side or negative side of the armature.

Description : Describe the operation of N channel enhancement type MOSFET with diagram.

Answer : As its name indicates, this MOSFET operates only in the enhancement mode and has no depletion mode. It operates with large positive gate voltage only. It does not conduct when the ... of charge carriers attracted to the positive gate. Thus drain current is controlled by the gate potential.

Discuss Now ← Prev Page Next Page →