Skip to content
← Electronics

Electronics · 2nd Puc Science

Ch 9Power Electronics and its Applications — 2nd PUC Electronics, concept-first.

Power electronics is the branch of electronics that uses solid-state semiconductor devices to control and convert electrical power from one form to another. Ordinary electronics handles small signals that carry information; power electronics instead handles the flow of energy itself, switching hundreds of volts and ten…

Exam weightage:1m × 12m × 13m × 1

111

Q&A

16

Concepts

6m

Exam weightage

Start learning — read this chapter →

Key concepts

Hover a concept to preview it and jump to its most relevant Q&A.

Power Diode V-I Characteristics and the Shockley Equation

The power diode's forward drop is VAK = Vⱼ + RON IF and its current follows the Shockley equation; the ohmic drift-region drop makes the forward curve more linear than a signal diode's.

Most relevant Q&A

Start with this concept →

Chapter contents

The NCERT structure, section by section. Open a section to see its questions, then read the concept-first solution.

Introduction

Power electronics is the branch of electronics that uses solid-state semiconductor devices to control and convert electrical power from one form to another.

9.1

Power Semiconductor Devices

Power electronics begins with the switching devices themselves. This part of the chapter looks at each power semiconductor device in turn — how it is built, how it is biased, and the shape of its outp…

9.2

Applications of Power Electronics

Applications of Power Electronics brings the devices of the first part together into working converters.

Chapter Summary

Chapter recap — Power Electronics and its Applications

More questions

111 Q
+Show 9 questions9 questions
  1. Example 1A silicon power diode has \(V_j\) (the drop across the p+ n- junction) of 0.4 V, \(R_{ON}\) (ohmic drop) in the drift region of 0.002 \(\Ome…Free
  2. Example 2A p-n junction diode has a reverse saturation current rating of 50 nA at 32\(^\circ\)C. What should be the value of the forward current for…Free
  3. Example 3Determine anode current \(I_A\) of SCR when \(I_G\) = 0. Given \((\alpha_1 + \alpha_2)\) = 0.58 and \((I_{co1} + I_{co2})\) = 1 mA.Free
  4. Example 4Determine cathode current \(I_K\) of SCR when gate current \(I_G\) = 100 mA, \(\alpha_1\) = 0.49, \(\alpha_2\) = 0.49 and .Preview
  5. Example 5Determine \(V_{dc}\) and \(I_{dc}\) of SCR HWR. Given firing angle is 90\(^\circ\) and rms voltage of ac input to the rectifier is 230 V and…Preview
  6. Example 6Determine \(V_{dc}\) and \(I_{dc}\) of SCR FWR. Given firing angle is 60\(^\circ\) and rms voltage of ac input to the rectifier is 230 V and…Preview
  7. Example 7If an AC voltage \(V = 240 \sin 314t\) is applied to an SCR HWR. If it has firing angle 30\(^\circ\), determine \(V_{dc}\) and \(I_{dc}\) wh…Preview
  8. Example 8At what firing angle does SCR of FWR must be triggered to supply \(V_{dc}\) of 60 V to a load. Given \(V_m\) = 155.5 V.Preview
  9. Example 9Determine average value of DC from the chopper. Given T = 1 mS, \(T_{ON}\) = 0.5 mS and supply voltage is 50 V.Preview
+Show 6 questions6 questions
  1. Q1A p-n junction diode has a reverse saturation current rating of 100 nA at 50\(^\circ\)C. What should be the value of the forward current for…Free
  2. Q2Determine cathode current \(I_K\) of SCR when \(I_G\) = 0. Given \((\alpha_1 + \alpha_2)\) = 0.99 and \((I_{co1} + I_{co2})\) = 3 mA.Free
  3. Q3Determine anode current \(I_A\) of SCR when gate current \(I_G\) = 50 mA, \(\alpha_1\) = 0.495, \(\alpha_2\) = 0.495 and \(I_{CO1}\) = 1 mA…Preview
  4. Q4Determine \(V_{dc}\) and \(I_{dc}\) of SCR HWR. Given firing angle is 30\(^\circ\) and rms voltage of ac input to the rectifier is 30 V and…Preview
  5. Q5Determine \(V_{dc}\) and \(I_{dc}\) of SCR FWR. Given firing angle is 0\(^\circ\) and rms voltage of ac input to the rectifier is 12 V and a…Preview
  6. Q6Determine average value of DC from the chopper. Given T = 2 mS, \(T_{ON}\) = 0.5 mS and supply voltage is 24 V.Preview
+Show 35 questions35 questions
  1. Q1What is power electronics?Free
  2. Q2Mention any one power semiconducting device.Free
  3. Q3What is a power diode?Free
  4. Q4Which layer is also called as 'drift layer' in power diode?Preview
  5. Q5Draw the circuit symbol of a power diode.Preview
  6. Q6Which are the two heavily doped layers in power diode?Preview
  7. Q7What is the magnitude of impurity atom densities in drift layer?Preview
  8. Q8Write an expression for the voltage drop across forward conducting power diode.Preview
  9. Q9Give the expansion of PBJT.Preview
  10. Q10Draw the circuit symbol of npn PBJT.Preview
  11. Q11What are the operating regions of PBJT?Preview
  12. Q12Expand SCR.Preview
  13. Q13Draw the circuit symbol of SCR.Preview
  14. Q14How many PN junctions present in SCR?Preview
  15. Q15Mention an application of TRIAC.Preview
  16. Q16Draw the circuit symbol of TRIAC.Preview
  17. Q17Expand MOSFET.Preview
  18. Q18Draw the circuit symbol of n-channel enhancement power MOSFET.Preview
  19. Q19Expand IGBT.Preview
  20. Q20Draw the circuit symbol of IGBT.Preview
  21. Q21Draw the symbol of DC chopper.Preview
  22. Q22Write the expression for load voltage and load current of a half wave rectifier.Preview
  23. Q23Write the expression for firing angle of full wave rectifier with RC triggering circuit.Preview
  24. Q24Write the expression for load voltage and load current of SCR full wave rectifier.Preview
  25. Q25Name the converter which converts AC to unipolar DC current.Preview
  26. Q26What is the function of AC voltage controller?Preview
  27. Q27Which power semiconducting device is used in the construction of single phase AC voltage controller?Preview
  28. Q28What is the function of DC chopper?Preview
  29. Q29What is the function of Inverter?Preview
  30. Q30Write an expression for the average voltage of a DC chopper.Preview
  31. Q31What is the duty ratio of a chopper?Preview
  32. Q32Mention an application of DC to AC inverters.Preview
  33. Q33What are gate drive circuits?Preview
  34. Q34What are pulse transformers?Preview
  35. Q35What are opto-couplers?Preview
+Show 27 questions27 questions
  1. Q1Mention four applications of power electronics.Free
  2. Q2Mention any four power devices.Free
  3. Q3Draw the schematic cross section of power diode.Free
  4. Q4What are the magnitudes of impurity atom densities in two heavily doped layers of power diode?Preview
  5. Q5Write the Shockley diode equation for the current through the power diode and explain its terminology.Preview
  6. Q6Draw the structure of power diode.Preview
  7. Q7Draw the schematic construction of SCR.Preview
  8. Q8Draw the circuit symbol of npn and pnp transistors.Preview
  9. Q9Draw the equivalent circuit of thyristor in terms of two transistors.Preview
  10. Q10Name the terminals of a TRIAC.Preview
  11. Q11Mention four modes of operation of TRIAC.Preview
  12. Q12Draw static V-I characteristics of TRIAC.Preview
  13. Q13Mention the two types of enhancement power MOSFETs.Preview
  14. Q14Name the terminals of MOSFET.Preview
  15. Q15Name the terminals of IGBT.Preview
  16. Q16Why the power semiconductor devices are used in power controls?Preview
  17. Q17Name the types of power converters and draw their symbols.Preview
  18. Q18Sketch input and output waveform of SCR HWR.Preview
  19. Q19Sketch input and output waveform of SCR FWR.Preview
  20. Q20Sketch input and output waveform of TRIAC AC voltage controller.Preview
  21. Q21Sketch the output wave form of a chopper circuit for DC input of 10 V and duty ratio of 75%.Preview
  22. Q22Sketch the output wave form of inverter circuit for DC input of 12 V with frequency of 50 Hz.Preview
  23. Q23Write a note on gate drive circuits.Preview
  24. Q24Write a note on pulse transformers.Preview
  25. Q25Write a note on opto couplers.Preview
  26. Q26Draw the circuit diagram of Opto coupler isolator circuit for MOSFET/IGBT.Preview
  27. Q27Write the diagram of SCR protection circuit.Preview
+Show 16 questions16 questions
  1. Q1Show that the ohmic drop makes the forward VI characteristics of a power diode more linear.Free
  2. Q2Explain \(P^+\,n^-\) junction under thermal equilibrium.Free
  3. Q3Explain Non-punch through diode.Free
  4. Q4Explain punch through diode.Preview
  5. Q5Draw the static characteristics of a power transistor and mark different region.Preview
  6. Q6Draw the structure of SCR.Preview
  7. Q7Draw the VI Characteristics of SCR.Preview
  8. Q8Draw the Schematic symbol of TRIAC and explain its terminals.Preview
  9. Q9What are the advantages of static switches?Preview
  10. Q10Draw the circuit diagram, input and output waveforms of SCR half wave rectifier with RC triggering circuit.Preview
  11. Q11Draw the circuit diagram, input and output waveforms of SCR full wave rectifier with RC triggering circuit.Preview
  12. Q12Draw the circuit diagram, input and output waveforms of single phase AC voltage controllers.Preview
  13. Q13Draw the circuit diagram and output waveforms of DC chopper.Preview
  14. Q14Draw the circuit diagram and output waveforms of Inverter.Preview
  15. Q15Draw the circuit diagram and input output waveforms of an opto-coupler isolation circuit.Preview
  16. Q16What are the factors against which the power semiconductor devices and converters must be commonly protected?Preview
+Show 18 questions18 questions
  1. Q1Explain the operation of power diode under forward biased condition.Free
  2. Q2Explain the operation of power diode under the reverse biased condition.Free
  3. Q3Explain V-I Characteristics of a power diode.Free
  4. Q4Explain the output V-I characteristics of a power transistor.Preview
  5. Q5Obtain an expression for anode current \(I_A\) when \(I_G = 0\).Preview
  6. Q6Obtain an expression for anode current \(I_A\) when gate is applied with \(I_G\).Preview
  7. Q7Describe the static VI characteristics of SCR.Preview
  8. Q8Describe the static VI characteristics of TRIAC.Preview
  9. Q9Describe the output VI characteristics of a power MOSFET.Preview
  10. Q10Describe the output VI characteristics of IGBT.Preview
  11. Q11Explain the construction and working of SCR half wave rectifier with RC triggering circuit.Preview
  12. Q12Explain the construction and working of SCR full wave rectifier with RC triggering circuit.Preview
  13. Q13Explain the working of AC voltage controller.Preview
  14. Q14Explain the working of DC to DC chopper circuit.Preview
  15. Q15Explain the working of DC to AC Inverter circuit.Preview
  16. Q16Describe the operation of pulse transformer isolation circuit.Preview
  17. Q17Describe the operation of opto coupler isolator circuit for MOSFET/IGBT.Preview
  18. Q18Write a note on the protection of power devices and converters.Preview