Power Electronics Converters 1. a. Identity three areas where power electronics is widely used. Briefly discuss how they

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Power Electronics Converters 1 A Identity Three Areas Where Power Electronics Is Widely Used Briefly Discuss How They 1 (53.56 KiB) Viewed 34 times

Power Electronics Converters 1. a. Identity three areas where power electronics is widely used. Briefly discuss how they are used b. Discuss the level of suitability for power electronics applications of the following devices: BJT. MOSFET, IGBT. SCR- and GTO-thyristor c. Discuss the factors that limit the amount of power handled by semiconductor devices in high power applications d. What are the three main power losses that contribute to transistor's junction temperature c. How do the three power loss sources in (d) compare in BJT. MOSFET and IGBT. f. Describe the operation of a switching power pole g. Sketch equivalent circuits for a step-up and a step-down converter. Identify the conventional names associated with these two converters h. Discuss the process of generating the switch control signal for these converters that is based on pulse width modulation i. Discuss the switch-on characteristic of the MOSFET as used in a switching power pole. Support your discussion with clearly labelled diagrams of the gate turn on characteristic of the MOSFET, the drain to source voltage versus time and drain current versus time diagrams 2. Thyristors and diodes are widely used in high power applications. a. For the circuit shown in Fig. 1. i give a brief analysis of how the single-phase controlled rectifier operates. 11. derive an equation for the average output voltage iii. derive an equation for the mms output voltage HE Fig.1: Single-phase Thyristor rectifier. b. For the full bridge uncontrolled rectifier in Fig.2, illustrate the voltage waveforms across the load: current waveforms through DI&D2, D3&D4 and current waveforms through the supply (1.) & the load (i) for a resistive load. c. Discuss the potential advantages and limitations of replacing the diodes in Fig. 2 with BJTS. MOSFets, IGBTs or Thyristors d. If the rectifier in Figure 2 has a purely resistive load of R, derive formulae for (1) the average output voltage and current (in) the rms output voltage and current (iii) the efficiency e. The circuit in Figure 2 will produce a pulsating output voltage. What are the potential problems with such outputs and what are the possible solutions?