A three-phase, half-wave uncontrolled rectifier is fed from an ideal three-phase voltage 50 Hz. The load is resistive with R=15 N. Calculate: (a) The average output voltage and average load current of the rectifier. (b) The d.c. and a.c. power dissipations in the load. (c) The diode ratings. (d) What is the lowest ripple frequency of the output voltage waveform? Pae,
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- Figure shows an AC source G having an effective voltage of 240 V, 60 Hz is connected to a single-phase full-wave rectifier. The resistance for R is 53 Ω and ripple-to-ripple current is 15%.Determine the DC voltage and DC current across the resistor. Hence, determine the power absorbed by the load. Assuming all diodes are ideal.A three-phase, half-wave uncontrolled rectifier is fed from an ideal three-phase voltage source of 380V, 50 Hz. The load is resistive with R=15 2. Calculate: (a) The average output voltage and average load current of the rectifier. (b) The d.c. and a.c. power dissipations in the load. (c) The diode ratings. (d) What is the lowest ripple frequency of the output voltage waveform?Q.1 A single-phase diode bridge rectifier is connected to a grid with rms voltage V, 230V at 50 Hz. Assume that the load is highly inductive, so it could be represented by a constant dc current, Id = 10A. a) Sketch the load voltage and find the average voltage of the load? b) Sketch the source current (grid. AC side) and find the rms value of the source current? c) Determine the fundamental source current and the first three harmonics? Assume Ish_rms ³ 0.91a/h for odd hand 0 otherwise?
- The full-wave rectifier ias shown is operating at a frequency of 60 Hz, and the rms value of the transformer output voltage is 18 V. (a) What is the value of the dc output voltage if the diode voltage drop is 1 V? (b) What is the minimum value of C required to maintain the ripple voltage to less than 0.25 V if R = 0.5 Ω? (c) What is the PIV rating of the diode in this circuit? (d) What is the surge current when power is first applied? (e) What is the amplitude of the repetitive current in the diode?A full-wave bridge rectifier with a 236.86V p-p sinusoidal input has a load resister of 2KΩi. Draw the wave form that the load resistor R would see. ii. Assuming diodes are ideal, what is the dc voltage available at the load resistor? iii. What is the dc voltage available at the load if silicon diodes are employed? iv. Calculate the maximum current flow through the Diode D4 during conduction.The voltage waveforms shown below are obtained from a three-phase power rectifier used in an ESKOM application.The rectifier output before the inductive filter is denoted by VL and the load voltage after the inductive filter by Vo. Ignore any diode losses and consider a load resistance of 12.7 Ω. Analyse the waveforms and specify / calculate,11) the supply frequency;12) the rectifier pulse number;13) the rectifier average output voltage;14) the average output current;15) the r.m.s. value of the output current;16) the r.m.s. value of the harmonics present in the output current;17) the dc current rating of the rectifier diodes;18) the r.m.s. current rating of the rectifier diodes;19) the peak repetitive reverse voltage rating of the rectifier diodes;20) the peak repetitive forward current rating of the rectifier diodes;21) the line-line r.m.s. voltage of the three-phase supply;22) the rectification efficiency of the converter;23) the converter transformer utilisation factor;
- A single-phase fully controlled, full-wave, bridge rectifier has a source of 220 V rms at 50 Hz, and is feeding a load 15 Ω and 10 mH. The firing angle α = 60˚ and the current extinction angle β =250˚; Determine (a) Average load voltage and current (b) RMS load voltage and current (c) AC and DC powers absorbed by the load (d) Determine the efficiency of the converter (e) Sketch the appropriate load voltage and load current waveforms (f) Determine whether the current is continuous or discontinuousA single-phase fully controlled, full-wave, bridge rectifier has a source of 230 V rms at 50 Hz, and is feeding a load R = 25 and L = 10 mH. The firing angle α = 45˚ and the current extinction angle β =230˚. It is required to: (a) Sketch the appropriate load voltage and load current waveforms. (b) Determine whether the current is continuous or discontinuous. (d) Determine the average load voltage and current. (e) Determine the rms load voltage and current. (f) Determine the a.c. and d.c powers absorbed by the load. (g) Determine the efficiency of the converter.1. Draw and briefly explain the ideal characteristics of PN-junction diode ? 2. Explain briefly about avalanche and Zener breakdown ? 3. In which region can Zener diode be used as a regulator? Why? 4. What is the ripple factor? For a good filter, should the ripple factor be high or low? 5. What is a rectifier? What is the difference between a full-wave rectifier and a half-wave rectifier?