Consider the ac equivalent circuit in Figure P6.40. The transistor parameters are β = 80 and V A = ∞ ). (a) Design the circuit (find I C Q and R E ) such that R i b = 50 kΩ and A υ = 0.95 . (b) Using the results of part (a), find R o .
Consider the ac equivalent circuit in Figure P6.40. The transistor parameters are β = 80 and V A = ∞ ). (a) Design the circuit (find I C Q and R E ) such that R i b = 50 kΩ and A υ = 0.95 . (b) Using the results of part (a), find R o .
Solution Summary: The author explains the design parameters of the circuit. The voltage gain of small gain is given by.
Consider the ac equivalent circuit in Figure P6.40. The transistor parameters are
β
=
80
and
V
A
=
∞
). (a) Design the circuit (find
I
C
Q
and
R
E
) such that
R
i
b
=
50
kΩ
and
A
υ
=
0.95
. (b) Using the results of part (a), find
R
o
.
6.8. In a single-phase mid-point converter, turns ratio from primary to each secondary is
source voltage is 230 V, 50 Hz. For a resistive load of R = 22, determine
ry is 1.25. The
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(a) maximum value of average output voltage and load current and the corresponding firing and
conduction angles,
(b) maximum average and rms thyristor currents,
(c) maximum possible values of positive and negative voltages across SCRs, beef JЯ A (6)
(d) the value of a for load voltage of 100 V,
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of part (d).88 mois q
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sin wt d(wt) etc.)
(e) the value of voltage across SCR at the instant of commutation for a of
Hint. (b) Maximum average thyristor current =
1 Vm
2π J0R
π
bsof bus
[Ans. (a) 165.63 V, 82.82 A, a = 0°, y= 180° (b) 41.41 A, 65.054 A
(c) 520.4 V, 520.4 V (d) 52.862° (e) 414.82 V]
Phase Controlled Rectifiers
[Prob. 6]
243
bao6.9. (a) A single-phase full converter charges a…
6.11. A single-phase full converter feeding RLE load has the following data. Source volt-
age=230 V, 50 Hz; R = 2.5 2, E = 100 V, Firing angle = 30°.
If load inductance is large enough to make the load current virtually constant, then
(a) sketch the time variations of source voltage, source current, load voltage, load current, current
through one SCR and voltage across it,
(b) compute the average value of load voltage and load current,
(c) compute the input pf. [Ans. (a) Refer to Fig. 6.10 (b), (b) 179.30 V, 31.72 A (c) 0.7796 lag]
6.4) Explain conceptually whygm( sat) andgare the same.
Where,
g is conductance and gm(sat) is saturation transconductance.
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