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Forced commutation requires
b Explanation: Forced commutation requires a pre charged capacitor of correct polarity to turn-off the earlier conducting SCR
b
Explanation: Forced commutation requires a pre charged capacitor of correct polarity to
turn-off the earlier conducting SCR
See lessThe McMurray circuit is a
b Explanation: McMurray is a popularyly used forced commutated VSI circuit.
b
Explanation: McMurray is a popularyly used forced commutated VSI circuit.
See lessIn voltage fed thyristor inverters __________ commutation is required
b Explanation: In VSI, the input voltage source Vs keeps the SCRs always forward biased. Hence, forced commutation becomes essential.
b
Explanation: In VSI, the input voltage source Vs keeps the SCRs always forward biased.
Hence, forced commutation becomes essential.
See lessDetermine the distortion factor (μ) for a full bridge inverter with supply Vs = 60 V.
c Explanation: V 1 (rms) = 4Vs/π√2 = 54.02 V rms value of output voltage V r = Vs = 60 V. μ = V 1 /V r = 54.02/60 = 0.9.
c
Explanation: V
1 (rms) = 4Vs/π√2 = 54.02 V
rms value of output voltage V
r = Vs = 60 V.
μ = V
1
/V
r = 54.02/60 = 0.9.
See lessA single phase full bridge inverter using transistors and diodes is feeding a R load of 3 Ω with the dc input voltage of 60 V. Find the fundamental frequency output power.
c Explanation: V 1 (rms) = 4Vs/π√2 = 54.02 V P = (V 1 ) 2 /R = 972.72 W.
c
Explanation: V
1 (rms) = 4Vs/π√2 = 54.02 V
P = (V
1
)
2
/R = 972.72 W.
See lessA single phase full bridge inverter using transistors and diodes is feeding a R load of 3 Ω with the dc input voltage of 60 V. Find the rms output voltage and the peak reverse blocking voltage of each transistor.
c Explanation: Rms output voltage = PIV of each transistor = Vs. Vs = 60 V.
c
Explanation: Rms output voltage = PIV of each transistor = Vs. Vs = 60 V.
See lessWhat would be the harmonic factor of lowest order harmonic in case of a half wave bridge inverter?
b Explanation: Let Vs be the input voltage. The 3rd harmonic is the lowest order harmonic. Vo (rms) = 2Vs/(n x π x √2) For fundamental component n = 1 and for the lowest order harmonic n = 3 ρ 3 = V 3 /V 1 = 1/3 or 33.33 %
b
Explanation: Let Vs be the input voltage.
The 3rd harmonic is the lowest order harmonic.
Vo (rms) = 2Vs/(n x π x √2)
For fundamental component n = 1 and for the lowest order harmonic n = 3
ρ
3 = V
3
/V
1 = 1/3 or 33.33 %
See lessA single phase inverter gives rms value of output voltage as 115 V and the fundamental output voltage of as 103.5 V. Find the THD (Total Harmonic Distortion).
c Explanation: V r = 115 V and V 1 = 103.5 V THD =[ (V r 2 – V 1 2 ) 1/2 / V 1 ] x 100 %
c
Explanation:
V
r = 115 V and V
1 = 103.5 V
THD =[ (V
r
2 – V
1
2
)
1/2
/ V
1 ] x 100 %
See lessFind the distortion factor (μ), for a single phase half wave bridge inverter with dc source Vs = 1 kV.
c Explanation: μ = V 1 /V r V 1 = rms value of fundamental component = 2Vs/π√2 V r = Total rms output voltage = Vs/2 μ = (2Vs/π√2) x (2/Vs) = 2√2/π = 0.9.
c
Explanation: μ = V
1
/V
r
V
1 = rms value of fundamental component = 2Vs/π√2
V
r = Total rms output voltage = Vs/2
μ = (2Vs/π√2) x (2/Vs) = 2√2/π = 0.9.
See lessA single-phase half bridge inverter is connected to a 230 V dc source which is feeding a R load of 10 Ω. Determine the average current through each SCR inverter switch.
b Explanation: Peak current through each SCR = Vs/2R = 11.5 A As each SCR would conduct for 180° of the total 360° cycle, average current = peak current/2 = 11.5/2 = 5.75 A.
b
Explanation: Peak current through each SCR = Vs/2R = 11.5 A
As each SCR would conduct for 180° of the total 360° cycle, average current = peak
current/2 = 11.5/2 = 5.75 A.
See less