Question 1a) Compare the holding current with the latching in SCR.b) A 400 V/50 Hz three-phase system is loaded with an ideal three-phase diode rectifierhaving a completely smooth output current of 50 A. An ideal three-phase thyristorconverter is connected in parallel with the diode rectifier. The output current of thethyristor converter is also 50 A and completely smooth, but the output power of thethyristor converter is zero.i.Draw the waveforms of the input currents to the two converters and the the sumof the two currents.ii.Calculate the power factor for the total load.c) The shown converter in Figure 1 operates in continuous conduction mode. Assume thecomponents are ideal.i, (1)in (t)v ic (t)Vo (t)iL (t) +v (t) -is (1)"; (1)Figure 1i.Sketch of i (t) and VL(t) for one switching period Ts.ii.Determine the DC voltage gain Vo/Vg as function of duty cycle, D.

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a) Compare the holding current with the latching in SCR.

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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Concept explainers

Types of Thyristors

With four layers of alternating P- and N- materials, a thyristor is a solid-state semiconductor device. It acts as a type of bi-stable switch and it conducts when the gate receives a current trigger and continues to conduct until the voltage is reverse biased across the device or by some means until the voltage is removed. The silicon-controlled rectifier is considered synonymous with thyristors by some sources. Thyristors are defined as more complex by other sources as it contains at least four-layer of alternating N-type and P-type substrate. They find large applications in the control of electrical power supplies, electric motor speed control, and ranging of light dimmers because thyristors can control large amounts of power supplies and voltage with a small device. The circuit symbol of the thyristor is given below.

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