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Oct 31, 2014

Power Electronics : Preparation Strategy for GATE EE

How to tackle Power Electronics for GATE in a most efficient way? This subject is a kind of nightmare for most Electrical Engineers.

First of all be clear with the fact that in power electronics we have to deal with a few concepts only. It has pretty less syllabus as compared to other subjects and has got good weightage. In this study plan it strictly suggested that you to own the following text books: PS Bimbhra , Rashid and Power Electronics pdf notes which is available in NPTEL website.

Power Electronic Devices:
For Basic operation of various devices follow Bimbhra as their operating characteristics are well explained in it. The diode problems one must solve before going to thyristor circuits are there in front pages of Bimbhra & they will explain you how a thyristor will work if it gets a continues gate signal or no gate signal. In a page range 30-70 of Bimbhra you will observe that there were some direct gate questions based on diode.

Phase Controlled Converters:
For rectifiers. Bimbhra is more than sufficient and one must be cautious about Fourier analysis of every rectifier. Understand the difference between ripple-free load and normal load. 90% of questions will be based on ripple-free  load and in that case if you have all the formulae on finger tips , you can fetch maximum marks. Coming to battery charging problems in rectifiers  go through the NPTEL notes & few problems are also there in text book.

For Choppers. Dont Follow Bimbhra. In case of problems which need attention towards inductor operation. More than the mere formulas we need basic concepts to answer the question. In GATE-14 first session there was a question on ripple current in some chopper , the formula mentioned in Bimbhra is (Vs/(4fL)) , if you apply this you will get an answer but its wrong. It must be solved by using basic kirchoff  law , which is well explained in Rashid. In Rashid you will find KVL approach to solve almost all equations which are very interesting and straight forward but for Fourier analysis follow Bimbhra.

Inverters and Commutation:
For Inverters and Commutation circuits Bimbhra is good. For Inverters also the Fourier analysis is important. Operation is well explained in that and most of the questions are repetitive in nature in gate. Small concepts like PWM methods might be confusing but at maximum you need 5 hours to get a grip on them. There are various methods to solve a single question in inverters which you'll know by practising .  

Cyclo Converters and AC Voltage Regulators:
Cyclo-Converters & AC voltage regulator are a combination of Rectifers and Inverters and very less questions will be asked in that area.

For those who feel Power Electronics as tough. 10-12  Days of first time preparation and two revisions are suggested for you before giving gate. Practice as many as problems. Go for discussions. While solving a problem you may see some option as fitting your calculations and you may be tempted to go for it to save time but please do not do that.

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