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
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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).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F51997f71-1201-4712-93a0-8696f5d25f76%2Ffb8ad15b-c9b8-444a-9a63-63f47477d279%2F0tmz77v_processed.jpeg&w=3840&q=75)
Transcribed Image Text: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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