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- 400 PUZZLES AND ANSWERS FOR INTERVIEW PDF CONVERTER SERIES
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It is the converter whose output frequency is less than the input frequency. It converts input power at one frequency to output power at another frequency with one stage conversion.Ģ2. What are the types of commutation with respect to commutation process?
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The process of the current flowing through the thyristor is forced to become zero by external circuitry is called as forced commutation.Ģ0. The process of the current flowing through the thyristor goes through a natural zero and enable the thyristor to turn off is called as natural commutation.
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It prevents the output voltage from becoming negative.
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What are the advantages of free wheeling diode in rectifier circuit? For high frequency applications having frequency range of more than 200kHz, we have to use MOSFET.ġ6.General rule of thumb is for low-frequency applications having frequency range upto 20kHz, we have to use IGBT.Because MOSFET has low switching losses compare to that of IGBT.For High frequency applications, MOSFET is the right choice of the device.For High frequency applications will you prefer MOSFET or IGBT? Why? The IGBTs are suitable for applications which has breakdown voltage upto 1000V.ġ5.General rule is MOSFETs are suitable for applications which has breakdown voltage less than 250V.ie, Their voltage rating is lesser than IGBT. Because MOSFETs are low voltage devices.For High voltage applications we have to use IGBT.For High voltage applications will you prefer MOSFET or IGBT? What are the characteristics of ideal Opamp?ġ4. Generally, fuses have a DC voltage rating that is half of the maximum AC voltage rating.ġ3. Can fuses with an AC voltage rating be used in a DC applications?įuses must be rated for the voltage AC or DC in which they will be used. It is the ratio of the ON time of the chopper to total time period of the chopper.ġ2. Name some of the voltage driven ( Voltage controlled) devices Name some of the current controlled (current driven) devices…ġ0. What are the main components used for isolating the Power Circuits, Power Semiconductor from the low-power circuit?ĩ. SOA – Safe Operating Area determines the voltage and current boundary within which the Power Device can be operated without destructive failure.Ĩ. The angle between the zero crossing of the input voltage and the instant the SCR is fired is called as delay angle or firing angle. It reduces the turn ON time and enhances the di/dt capability. When gate current is several times higher than the required gate current, the SCR is said to be hard fired.
400 PUZZLES AND ANSWERS FOR INTERVIEW PDF CONVERTER SERIES
It is a series combination of a resistor and a capacitor in parallel with the SCR.ĥ. The snubber circuit is used for the dv/dt protection of the SCR. What are the different turn on methods of SCR? It is the minimum current required to latch(turn on) the SCR from forward blocking state to forward conduction state.ģ. When the forward current becomes less than holding current, SCR turns from forward conduction state to forward blocking state. It is the minimum current required to hold the SCR in forward conduction state. POWER ELECTRONICS Interview Questions with Answers :.