Power Electronics: AC-DC and DC-AC Converters
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Questions and Answers

What describes a three-phase fully controlled rectifier with R load?

  • Provides zero output voltage under all load conditions.
  • Can convert AC to DC using silicon-controlled rectifiers. (correct)
  • Only allows current flow during positive half cycles.
  • Requires additional diodes for full-wave operation.

Which converter operates in Continuous Conduction Mode (CCM)?

  • Buck converter maintaining inductor current at zero.
  • Step-down converter with significant load variations.
  • Boost converter where the inductor never discharges fully. (correct)
  • Buck-boost converter that intermittently switches off.

What is a key characteristic of PWM with bipolar voltage switching?

  • Generates a single polarity output waveform.
  • Results in higher harmonic distortion compared to unipolar modulation.
  • Switching occurs only at the zero-crossing of the input signal.
  • Allows for more precise control of output voltage than unipolar switching. (correct)

What is the primary purpose of harmonic analysis in three-phase converters?

<p>To assess the impact of non-linear loads on supply systems. (B)</p> Signup and view all the answers

Which mode of operation is associated with three-phase square wave inverters?

<p>It utilizes 120° conduction intervals to generate output. (C)</p> Signup and view all the answers

Flashcards

Three-phase AC-DC Converters

Electronic circuits converting three-phase AC power to DC power.

DC-DC Converters

Electronic circuits changing DC voltage levels.

Chopper operation

Switching DC power, affecting output voltage/current. Important to control.

PWM (Pulse Width Modulation)

Controlling the 'on' & 'off' times of a voltage pulse to change the output waveform.

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AC-AC Power Control (Phase Control)

Regulating AC power output by adjusting the timing of the switches in the AC circuit.

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Study Notes

Unit 3: Three-Phase AC-DC Converters & AC-AC Converters

  • Three-phase half-wave rectifier with R and RL load.
  • Three-phase fully controlled rectifier with R and RL load.
  • Three-phase semi converter with R and RL load.
  • Expression for output voltage.
  • Harmonic analysis.
  • Three-phase dual converters.
  • Numerical problems.
  • AC-AC power control by phase control with R and RL loads.
  • RMS output voltage.
  • Single-phase step-down and step-up bridge cycloconverter.
  • Numerical problems.

Unit 4: DC-DC Converters

  • Operation of basic chopper.
  • Classification.
  • Control techniques.
  • Steady-state time-domain analysis of basic chopper.
  • Analysis of Buck, Boost, and Buck-Boost converters.
  • Continuous Conduction Mode (CCM).
  • Discontinuous Conduction Mode (DCM).
  • Output voltage equations using volt-second balance in CCM and DCM.
  • Expressions for output voltage ripple and inductor current ripple.
  • Numerical problems.

Unit 5: DC-AC Converters

  • Introduction.
  • Single-phase half-bridge and full-bridge inverters with R and RL loads.
  • Phase Displacement Control.
  • PWM with bipolar voltage switching.
  • Three-phase square wave inverters.
  • 120° conduction.
  • 180° conduction.
  • Sinusoidal Pulse Width Modulation.
  • Current Source Inverter (CSI).
  • Numerical problems.

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Description

Explore the key concepts and numerical problems related to three-phase AC-DC converters, DC-DC converters, and DC-AC converters. This quiz covers various types of rectifiers, choppers, and control techniques, providing insights into their operation and analysis. Test your understanding of harmonic analysis, output voltage equations, and converter classifications.

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