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..


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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 ]

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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 ]

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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 ].

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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 ].

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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 ]

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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 ].

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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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