20 Aug 1. A DC chopper has a resistive load of 20 ohms and input voltage Vs = 220V.
1. A DC chopper has a resistive load of 20 ohms and input voltage Vs = 220V. When the chopper switch remains on, its voltage drop vch = 4V and the chopping frequency is f = 2kHz. If the duty cycle is 50%, determine the;
Average output voltage, Va
Rms output voltage, VO
Chopper efficiency
Effective input resistance of the chopper, Ri
Rms value of the fundamental component of output harmonic voltage
2.A buck regulator has an input voltage of VS = 10V. The average output voltage , Va = 20V and the average load current, Ia = 0.8A. The switching frequency is 20kHz. If L= 200µH and C = 240µF, determine the;
Duty cycle, k
Ripple current of inductor, ΔI
Peak current of inductor, I2
Ripple voltage of filter capacitor, Vc
3. A chopper is feeding an RL load with Vs = 220V, R = 15Ω, L = 10mH, f = 1.5kHz and E= 0V. Calculate the
Minimum instantaneous current I1
Peak instantaneous load current, I2
Maximum peak-to-peak load ripple current
Average value of load current, Ia
Rms load current, Io
Effective input resistance seen by the source, Ii
Rms chopper current, IR
4. A chopper has a load resistance, R= 0.30Ω, VS = 500V, E= 0V. The average load current, Ia=150A, and chopping frequency, f= 500 Hz. Use the average output voltage to calculate the load inductance, L, which would limit the maximum load ripple current by20%
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