7. For certain applications of power supply a power semiconductor switch is requiredto operate with 400V, 200A load and switching frequency of 100 kHz .The powerswitching device suitable for this task is:(a) GTO (b) IGBT(c) MOSFT(d) BJT(e) Triac8. The latching current of an SCR used in a phase-control circuit, comprising aninductive load of R= 10 ohms in series with L= 0.1H, is 10mA.The supply voltage is325 sin 314 t volts. Obtain the minimum gate pulse width required for reliabletriggering of the SCR if it is gated at an angle of 45° in every positive half-cycle.The load current i(t) for the circuit is given by :i(t)=[Vm/√R² + (ot)2] [sin (314t+45°-p) - sin( 45°-p)exp(-Rt/L)]where Vm= 325 V,-314, tan q = 3.14(ANS: At> 4.35 µS)9. The gate-cathode junction of the SCR in problem (8) above has a voltage - currentcharacteristic which is a straight line passing through the origin with a gradient of3000 volts/amp, calculate the minimum required gate source resistance given thatavailable gating voltage is 10 V and the maximum permissible gate dissipation is12 mW.(Ans: 2 k22)10. A thyristor with a latching current of 40 mA is used in the circuit shown in Fig.1.If a firing pulse of 50 µs is applied at the instant of maximum source voltage, showthat the thyristor will not be turned on. What value of resistance R connected asshown to ensure triggering (turn-on).

7. For certain applications of power supply a power semiconductor switch is required to operate with 400V, 200A load and switching frequency of 100 kHz.The power switching device suitable for this task is: (a) GTO (b) IGBT (c) MOSFT (d) BJT (e) Triac

7. For certain applications of power supply a power semiconductor switch is required to operate with 400V, 200A load and switching frequency of 100 kHz.The power switching device suitable for this task is: (a) GTO (b) IGBT (c) MOSFT (d) BJT (e) Triac

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

Maximum power transfer theorem

A resistive load will consume maximum power from a network when the load resistance is equal to the resistance of the network as viewed from the open-circuit terminals, with all energy sources removed leaving only the internal resistances. Physicist Moritz von Jacobi introduced the maximum power transfer theorem in 1940. Therefore, this theorem is also known as Jacobi's law.

Question

7. For certain applications of power supply a power semiconductor switch is required
to operate with 400V, 200A load and switching frequency of 100 kHz .The power
switching device suitable for this task is:
(a) GTO (b) IGBT
(c) MOSFT
(d) BJT
(e) Triac
8. The latching current of an SCR used in a phase-control circuit, comprising an
inductive load of R= 10 ohms in series with L= 0.1H, is 10mA.The supply voltage is
325 sin 314 t volts. Obtain the minimum gate pulse width required for reliable
triggering of the SCR if it is gated at an angle of 45° in every positive half-cycle.
The load current i(t) for the circuit is given by :
i(t)=[Vm/√R² + (ot)2] [sin (314t+45°-p) - sin( 45°-p)exp(-Rt/L)]
where Vm= 325 V,
-314, tan q = 3.14
(ANS: At> 4.35 µS)
9. The gate-cathode junction of the SCR in problem (8) above has a voltage - current
characteristic which is a straight line passing through the origin with a gradient of
3000 volts/amp, calculate the minimum required gate source resistance given that
available gating voltage is 10 V and the maximum permissible gate dissipation is
12 mW.
(Ans: 2 k22)
10. A thyristor with a latching current of 40 mA is used in the circuit shown in Fig.1.
If a firing pulse of 50 µs is applied at the instant of maximum source voltage, show
that the thyristor will not be turned on. What value of resistance R connected as
shown to ensure triggering (turn-on).

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