Power Electronics - 2 MARKS

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Power Electronics - 2 Marks
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  PREPARED BY N.SENTHILNATHAN AND M.SURESH, KEC/EEE, PERUNDURAI Page 1 KONGU ENGINEERING COLLEGE, PERUNDURAIERODE – 638 052 (An Autonomous Institution Affiliated toAnna University of Technology, Coimbatore) DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING09EE602 - POWER ELECTRONICSTWO MARKS QUESTION AND ANSWERSPREPARED BYMr.N.SENTHILNATHAN M.E.,(Ph.D)Associate Professor /EEEMr.M.SURESH M.E.,Assistant Professor /EEE  PREPARED BY N.SENTHILNATHAN AND M.SURESH, KEC/EEE, PERUNDURAI Page 2 TWO MARKS QUESTION AND ANSWERSPOWER SEMI-CONDUCTOR DEVICES1. Why IGBT is very popular nowadays? a. Lower gate requirements   b. Lower switching losses   c. Smaller snubber circuit requirements  2. What are the different methods to turn on the thyristor? a. Forward voltage triggering   b. Gate triggeringc. dv/dt triggeringd. Temperature triggeringe. Light triggering 3. IGBT is a voltage controlled device. Why? Because the controlling parameter is gate-emitter voltage.  PREPARED BY N.SENTHILNATHAN AND M.SURESH, KEC/EEE, PERUNDURAI Page 3 4. Power MOSFET is a voltage controlled device. Why? Because the output (drain) current can be controlled by gate-source voltage 5. Power BJT is a current controlled device. Why? Because the output (collector) current can be controlled by base current. 6. What is the relation between A and B? B=A/(1-A) A=AlphaA=B/(1-B) B=Beta 7. What are the different types of power MOSFET? a. N-channel MOSFETb. P-channel MOSFET 8. How can a thyristor turned off? A thyristor can be turned off by making the current flowing through it to zero. 9. Define latching current?  The latching current is defined as the minimum value of anode current which it mustattain during turn on process to maintain conduction when gate signal is remove.  PREPARED BY N.SENTHILNATHAN AND M.SURESH, KEC/EEE, PERUNDURAI Page 4 10. Define holding current?  The holding current is defined as the minimum value of anode current below which itmust fall to for turning off the thyristor. 11. What is a snubber circuit?  It consists of a series combination of a resistor and a capacitor in parallel with thethyristors. It is mainly used for dv / dt protection. 12. What losses occur in a thyristor during working conditions? a. Forward conduction losses   b. Loss due to leakage current during forward and reverse blocking.   c. Switching losses at turn-on and turn-off.   d. Gate triggering loss.  13. Define hard-driving or over-driving? When gate current is several times higher than the minimum gate current required, athyristor is said to be hard-fired or over-driven. Hard-firing of a thyistor reduces its turn-on timeand enhances its di/dt capability.  
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