3.18In a single-phase half-wave ac-dc converter, the average value of the loadcurrent is 1.78 A. If the converter is operated from a 240 V, 50 Hz supplyand if the average value of the output voltage is 27% of the maximumpossible value, calculate the following, assume the load to be resistive.(a) Load resistance(b) Firing angle(c) Average output voltage(d) The rms load voltage(e) The rms load current(f) DC power(g) AC power(h) Rectifier efficiency(i) Form factor(j) Ripple factor

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Answered: 3.18 In a single-phase half-wave ac-dc…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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18. A dc-dc converter is to be built with the following specifications: Allowed dc input voltage range: +8 V to +18 V +24 V Output average voltage: Output voltage ripple: ±0.06 V maximum at rated load 300 W, resistive ±250 mA maximum at rated load 100 kHz Rated load: Input current ripple: Switching frequency: Common ground between input and output. a. Draw a circuit which can perform this function. b. What is the necessary range of duty ratio for each switch? c. Find circuit part values (R, L, and C) which will meet the stated specifications.
Q5. For the following center tapped transformer, show the waveform across each half of the secondary winding and across Ri, when a 100 V peak sine wave is applied to the primarywinding. What is the PIV rating must the diode have? (Use constant voltage drop model for the Silicon diode) IN4001 Ry OV 10k) D IN4001
In the full-wave rectifier circuit, the transformer has a turn ratio of 1:2. The transformer's primary winding is connected across an AC source of 230V (rms), 50 Hz. The load resistor is 50. For this circuit, determine the DC output voltage (3 significant figures)
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The three-phase full-wave converter shown below is used to rectify the three phase (Y-connection) source signals. The six Thyristor are triggered in the sequence shown. Sketch for firing angle (a=90°) the output voltage (Vo), the phase current, the current for any two Thyristor in any one leg, and the load current (Ia). Then calculate (a) Thyristor average and r.m.s current. (b) Supply average and r.m.s current. (c) The normalized average output voltage. (d) The maximum output voltage. [Vdc = [1 - cos(60+ a)] Vml T If the line-to-neutral voltages are defined as 11 T, T T STA T. Load I sin od sin() ex-> Solve the question sin(with your own hands the corresponding line-to-line voltages are √31% sin (out + ) ---√(4)
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Q1. a) Figure Q1 is a single phase 2-level voltage source converter (VSC) with a total DC voltage V-1000V. A PWM scheme, by comparing a reference value with a 1kHz triangular waveform, is used to control the switches S₁ and S2, and output 340v at Vo. With the aid of graphs explain how pulse signals for the switches are generated, sketch the output voltage Vo, determine the duty cycle and the modulation index. Va + 2 it Va d + TS₁ V {1+5₂ = Figure Q1 A single phase VSC
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2a
(a)Design a forward converter to produce an output voltage of 30V when the input dc voltage is unregulated and varies from 150V to 175V. The output power varies from 20W to 50W. The duty ratio of the switch is varied to compensate for the fluctuations in the input dc source to regulate the output voltage at 30V. Specify: the switching frequency and range of required duty ratio of the switch, ii. the turns ratios of the transformer, i. the value of L, and iv. the capacitance required to limit the output ripple to less than 0.2%. Your design MUST work for all operating conditions.

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