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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1) AC power in a load can be controlled by using a. Two SCR's in parallel opposition b. Two SCR's in series c. Three SCR's in series d. Four SCR's in series 2) The advantage of using free - wheeling diode in half controlled bridge converter is that a. There is always a path for the ac current independent of the ac line b. There is always a path for the dc current independent of the ac line c. There is always a path for the dc current dependent of the ac line d. There is always a path for the ac current dependent of the ac line 3) Silicon controlled rectifier can be turned on a. By applying a gate pulse and turned off only when current becomes zero b. And turned off by applying gate pulse c. By applying a gate pulse and turned off by removing the gate pulse d. By making current non zero and turned off by making current zero
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.
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)
6. A 1-phase full converter delivers ripple free current to RL load with R=1592. The source voltage is 230V, 50Hz, for a=30°. Determine rectification efficiency, voltage ripple factor displacement factor, and power factor
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(c) A buck converter, as shown in Figure Q3(i) below, is working in steady state. The output voltage and the inductor current can be assumed to be ripple free. Figure Q3(ii) shows the inductor voltage VL during a complete switching interval. Assuming all devices are ideal, determine (i) The output voltage, input voltage and the duty cycle of the buck converter. (ii) The inductor value required to maintain a peak-to-peak ripple current of 0.4A, if the switching frequency is 100kHz. V. M 30V 本D c+ v. TON TOFF 20V Ts (i) (ii) Figure Q3. (i) Equivalent circuit of a buck converter and (ii) inductor voltage over one complete cycle.
consider the following specifications for buck converter : Vin= 80v, Ro = 9 ohms, Po = 100watts, frequency is 150khz. determine a. the inductor value at the boundary condition. b. the maximum inductor current value for L = 10 Lcrit. (c). the doide rms and average current values
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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