A three-phase half-wave converter in Figure 2is operated from a three-phase Y-connected 208-V, 60-Hz supply and the load resistance is R = 10 2. If itis required to obtain an average output voltage of 50% of the maximum possibleoutput voltage, calculate(a) the delay angle a.(b) the rms and average output currents.(c) the average and rms thyristor currents.(d) the rectification efficiency.aT₁VanT₂vbnVcnmbKT3*Fig.2Vofuw meicRL

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Answered: A three-phase half-wave converter in…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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A thyristor half-wave controlled converter has a supply voltage of 240V at 50Hz and a load resistance of 100 ohms. What are the average values of load voltage and current when firing delay angle is; 1. 140 degrees. 2. 30 degrees.
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)
Drive the expression for the average output voltage of a single phase full converter and draw the waveform of output voltage. please explain in details
A fully controlled, single-phase bridge rectifier is powered from an ideal 220V, 50Hz source. The rectifier is triggered with a trigger angle of 60 degrees and provides a smooth current of 50A to the load at the output. According to this: a) Draw the waveform of the output voltage in scale and calculate the average value of the output voltage. Combine the average voltage signal with the output voltage wave signal. Show on the same figure. b) Draw the waveforms of the thyristor currents, the gap diode current and the current drawn from the source in scale. c) Calculate the value of the filter inductance used at the output when the ripple in the load current is 3A. (Do the operations by showing the output voltage shapes and areas on the figure. The answers should be in the system and order in the solved examples.)
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 of figure, the transformer has a turns ratio of 1:2. The transformer primary winding is connected across an AC source of 230v (rms), 50 Hz. The load resistor is 50ohms. For this circuit, determine the peak-to- peak ripple in the output voltage * Di v: = VmSin ot Vs V. + Vy = VSin ot D2 Full-wave rectifier. Circuit operation during positive half cycle ell + ミ」
c) A buck converter with constant frequency peak current mode control has Vs = 28V, V = 20V, L = 301uH, fs = 100 kHz. Find the ramp slop for the optimum compensation and the peak compensation voltage. %3D
a. What are DC Choppers? Explain what TRC (Time Ratio Control) is b. A Buck Converter is used with a 2mH inductor and a supply voltage of 15V. The load resistance is maintained at 1 Q. The switching frequency is 100 kHz. i. Determine the duty cycle needed for an output voltage of 5V. ii. Calculate the output supply voltage ripple. iii. What are the consequences of decreasing the load resistance by 50% (to 0.5 ohms)? c. Identify the class of converter in the figure and describe the principle of operation of such a converter. d. State a possible application of such a converter. e. Draw the output waveforms of the current and voltage and the gate pulses of the choppers. Indicate on the current waveform the region of operation of the choppers and diodes. CH₁ CH₂ AD₂ Chopper wwwroo E +← Vo
Q3. a) Design a DC/DC buck converter as shown in Figure Q3. has an input voltage of 12V and an output of 5V at 20A. Assume a switching frequency of 10kHz. Constrain the inductor ripple current to 10% of the input current and limit the output voltage ripple to 50mVp-p. i) Calculate the boundary duty cycle. Show whether the circuit is in continuous conduction mode or not and why? ii) How should the duty cycle be controlled so that the output voltage is 5V for loads between 0 and 2A? Vin DZ L Ω R Figure Q3. DC/DC buck converter.
In a single-phase half-wave ac-dc converter, the average value of the load current is 1.78 A. If the converter is operated from a 240 V, 50 Hz supply and if the average value of the output voltage is 27% of the maximum possible 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
Q3. Design a DC/DC buck converter (as shown in Figure Q3) for an input voltage of 12V and an output of 5V at 20A. Assume a switching frequency of 10kHz. Constrain the inductor ripple current to be 10% of the input current and limit the output voltage ripple to 50mVp-p. a) Explain the working mechanism of the converter by sketching equivalent circuit diagrams when the switch Q is ON and OFF, Calculate the duty cycle of the switch. Find the ripple of the inductor current. Calculate the required inductance and capacitance. Sketch the waveform of the output voltage. Is the converter works at continuous conduction mode CCM? If so, give proof of that b) c) d) e) f) g) If the load current varies between 0 and 2A, what is the value of the duty cycle range and at what operating condition? DA L C² Figure Q3 DC/DC buck converter. R
QUESTION 1 Design a high efficiency 3.3 V, 5A d.c.to d.c. power converter from a 4 to 5.5 Vdc source. The maximum allowable inductor current ripple and output voltage ripple are 0.1A and 20 mV, respectively. Assume a switching frequency of 20 kHz. a) Design a suitable converter power circuit using a MOSFET switch, showing all calculation of inductor and capacitor values and drawing a circuit diagram of the final design including component values. Indicate the peak inverse voltage and forward current rating of any diode required, and the maximum drain- source voltage of the MOSFET. b) On the Schematic diagram, draw the path of the current flow during the ON time and the OFF time. c) Describe the effect of changing the values of the inductor and the capacitor in the circuit. d) What is the effect of switching frequency in the circuit? e) Draw the schematic diagram of a circuit with the output voltage higher than the input voltage.

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