Power Semiconductor Devices - Power Electronic.pdf module 1

• Module 1 Power Semiconductor Devices
  • Lesson 1 Power Electronics, objectives: Create an awareness of the general nature of Power electronic equipment; ~ Brief idea about topics of study involved, ~ The key features of the principal Power Electronic Devices; ~ An idea about which device to choose for a particular application. ~ A few issues like base drive and protection of PE devices and equipment common to most varieties.. contents: [ How is Power electronics distinct from linear electronics? ~ Power Semiconductor device - history ~ Power Diodes ~ Silicon Controlled Rectifier (SCR) ~ MOSFET ~ The IGBT ~ The GTO ~ Power Converter Topologies ~ Base / gate drive circuit ~ Protection of Power devices and converters ]
  • Lesson 2 Constructional Features, Operating Principle, Characteristics and Specification of Power Semiconductor Diode, objectives: Draw the spatial distribution of charge density, electric field and electric potential in a step junction p-n diode. ~ Calculate the voltage drop across a forward biased diode for a given forward current and vice-verse. ~ Identify the constructional features that distinguish a power diode from a signal level diode. ~ Differentiate between different reverse voltage ratings found in a Power Diode speciation sheet. ~ Identify the difference between the forward characteristic of a power diode and a signal level diode and explain it. ~ Evaluate the forward current specifications of a diode for a given application. ~ Draw the “Turn On” and “Turn Off” characteristics of a power diode. ~ Define “Forward recovery voltage”, “Reverse recovery current” “Reverse Recovery charge” as applicable to a power diode.. contents: [ Review of Basic p-n Diode Characteristics ~ Construction and Characteristics of Power Diodes ~ Power Diode under Reverse Bias Conditions ~ Power Diode under Forward Bias Condition ~ Switching Characteristics of Power Diodes ]
  • Lesson 3 Power Bipolar Junction Transistor (BJT), objectives: Distinguish between, cut off, active, and saturation region operation of a Bipolar Junction Transistor. ~ Draw the input and output characteristics of a junction transistor and explain their nature. ~ List the salient constructional features of a power BJT and explain their importance. ~ Draw the output characteristics of a Power BJT and explain the applicable operating limits under Forward and Reverse bias conditions. ~ Interpret manufacturer’s data sheet ratings for a Power BJT. ~ Differentiate between the characteristics of an ideal switch and a BJT. ~ Draw and explain the Turn On characteristics of a BJT. ~ Draw and explain the Turn Off characteristics of a BJT. ~ Calculate switching and conduction losses of a Power BJT. ~ Design a BJT base drive circuit.. contents: [ Basic Operating Principle of a Bipolar Junction Transistor ~ Constructional Features of a Power BJT ~ Output i-v characteristics of a Power Transistor ~ Switching characteristics of a Power Transistor ~ Turn On characteristics of a Power Transistor ~ Turn Off Characteristics of a Power Transistor ~ Switching Trajectory and Switching Losses in a Power Transistor ~ Base Drive Design and Power Darlington ]
  • Lesson 4 Thyristors and Triacs, objectives: Explain the operating principle of a thyristor in terms of the “two transistor analogy”. ~ Draw and explain the i-v characteristics of a thyristor. ~ Draw and explain the gate characteristics of a thyristor. ~ Interpret data sheet rating of a thyristor. ~ Draw and explain the switching characteristics of a thyristor. ~ Explain the operating principle of a Triac.. contents: [ Constructional Features of a Thyristor ~ Basic operating principle of a thyristor ~ Steady State Characteristics of a Thyristor ~ Thyristor ratings ~ Switching Characteristics of a Thyristor ~ The Triac ~ Steady State Output Characteristics and Ratings of a Triac ~ Triac Switching and gate trigger circuit ]
  • Lesson 5 Gate Turn Off Thyristor (GTO), objectives: Differentiate between the constructional features of a GTO and a Thyristor. ~ Explain the turn off mechanism of a GTO. ~ Differentiate between the steady state output and gate characteristics of a GTO and a thyristor. ~ Draw and explain the switching characteristics of a GTO. ~ Draw the block diagram of a GTO gate drive unit and explain the functions of different blocks. ~ Interpret the manufacturer’s data sheet of a GTO.. contents: [ Constructional Features of a GTO ~ Operating principle of a GTO ~ Steady state and dynamic characteristics of a GTO ~ Dynamic characteristics of a GTO ~ GTO gate drive circuit ~ GTO Ratings ~ Specifications related to the switching performance ]
  • Lesson 6 Metal Oxide Semiconductor Field Effect Transistor (MOSFET), objectives: Differentiate between the conduction mechanism of a MOSFET and a BJT. ~ Explain the salient constructional features of a MOSFET. ~ Draw the output i-v characteristics of a MOSFET and explain it in terms of the operating principle of the device. ~ Explain the difference between the safe operating area of a MOSFET and a BJT. ~ Draw the switching characteristics of a MOSFET and explain it. ~ Design the gate drive circuit of a MOSFET. ~ Interpret the manufacturer’s data sheet rating of a MOSFET.. contents: [ Constructional Features of a Power MOSFET ~ Operating principle of a MOSFET ~ Steady state output i-v characteristics of a MOSFET ~ Switching characteristics of a MOSFET ~ Circuit models of a MOSFET cell ~ Switching waveforms ~ MOSFET Gate Drive ~ MOSFET Ratings ]
  • Lesson 7 Insulated Gate Bipolar Transistor (IGBT), objectives: Differentiate between the constructional features of an IGBT and a MOSFET. ~ Draw the operational equivalent circuit of an IGBT and explain its operating principle in terms of the schematic construction and the operational equivalent circuit. ~ Draw and explain the steady state output and transfer characteristics of an IGBT. ~ Draw the switching characteristics of an IGBT and identify its differences with that of a MOSFET. ~ Design a basic gate drive circuit for an IGBT. ~ Interpret the manufacturer’s date sheet of an IGBT.. contents: [ Constructional Features of an IGBT ~ Operating principle of an IGBT ~ Steady state characteristics of an IGBT ~ Switching characteristics of IGBT ~ IGBT ratings and safe operating area ]
  • Lesson 8 Hard and Soft Switching of Power Semiconductors, objectives: To highlight the issues related to device stresses under Hard switching; ~ To suggest means of reducing such stresses with external circuitry; ~ To propose alternative switching methods for stress reduction; ~ Enable the choice of the appropriate switching strategy. contents: [ Soft and Hard Switching ~ Losses in Power Semiconductors ~ Conduction Losses ~ Blocking Losses ~ Switching Losses ~ Diode ~ Soft switching ]
  
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