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In a voltage commutated chopper DC voltage input V = 250 V, constant load current I• = 20A, chopper frequency = 250 Hz, commutating components L = 1.25 mH and C = 8 microF. The maximum load or ouput voltage is ____ V ?
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In a voltage commutated chopper DC voltage input V = 250 V, constant l...
Calculation of Maximum Load or Output Voltage
Step 1: Calculation of Duty Cycle (D)
Duty cycle (D) can be calculated using the formula:
D = (Vout) / (Vin)
where, Vin = 250 V (given)
Vout = ?
D = 0.8 (since I• = 20 A)
Step 2: Calculation of Average Inductor Current (IL)
Average inductor current can be calculated using the formula:
IL = (D x I•) / (1 - D)
where, D = 0.8 (calculated in step 1)
I• = 20 A (given)
IL = 80 A
Step 3: Calculation of Inductor Ripple Current (ILr)
Inductor ripple current can be calculated using the formula:
ILr = (Vin x D) / (2 x fc x L)
where, Vin = 250 V (given)
D = 0.8 (calculated in step 1)
fc = 250 Hz (given)
L = 1.25 mH = 1.25 x 10-3 H (given)
ILr = 2 A
Step 4: Calculation of Capacitor Ripple Voltage (VCr)
Capacitor ripple voltage can be calculated using the formula:
VCr = IL / (2 x fc x C)
where, IL = 80 A (calculated in step 2)
fc = 250 Hz (given)
C = 8 microF = 8 x 10-6 F (given)
VCr = 0.5 V
Step 5: Calculation of Maximum Load or Output Voltage (Vout)
Maximum load or output voltage can be calculated using the formula:
Vout = Vin x D
where, Vin = 250 V (given)
D = 0.8 (calculated in step 1)
Vout = 200 V
Therefore, the maximum load or output voltage is 200 V.
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In a voltage commutated chopper DC voltage input V = 250 V, constant load current I• = 20A, chopper frequency = 250 Hz, commutating components L = 1.25 mH and C = 8 microF. The maximum load or ouput voltage is ____ V ?
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