Q3. a) Design a DC/DC buck converter as shown in Figure Q3. has an inputvoltage of 12V and an output of 5V at 20A. Assume a switching frequencyof 10kHz. Constrain the inductor ripple current to 10% of the input currentand limit the output voltage ripple to 50mVp-p.i)Calculate the boundary duty cycle. Show whether the circuit is incontinuous conduction mode or not and why?ii)How should the duty cycle be controlled so that the output voltage is5V for loads between 0 and 2A?VinDZLΩRFigure Q3. DC/DC buck converter.

Answered: Image /qna-images/answer/427819af-f588-4105-95a3-5352fddf4e6a.jpg

Answered: Q3. a) Design a DC/DC buck converter as…

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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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
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.
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
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
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
(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.
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.)
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
The Figure 2 shows an electronic circuit designed for supplying power to a load (R1). The supply voltage 235V (RMS, AC) at frequency of 50HZ. The required DC voltage and power for the load are 24V and 3.6 W respectively. The Electrical Components of this AC to DC converter are: A full-wave rectifier to convert AC voltage to DC voltage. A regulator with transistor and Zener diode to ensure a constant voltage and power for the load. D1 Iide 91 Vaut VLoad D2 D3 Vde VI sine R1 RL Regulate Reetifier Figure 2. Complete Circuit Assume that the diodes are real diodes (NOT ideal diodes). The following information is available: The collector to base resistor of the regulator R1 = 5.0 k The transistor Q1 with B value of 24 is used for the regulator circuit. Determine the following quantities for this electronic device and fill the table below: Question Answer The voltage of Zener Diode (Vz) The current in R1 The DC current into the regulator | (Idc) Base current of transistor (IB) Collector…
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.
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.
Do calculation. This is not a simulation problem

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