(Solved) A step down DC chopper has a resistive load of R = 15 ohm and input Vdc = 200 V. When the chopper remain ON, it's voltage drop is 2.5V. The chopper frequency is 1 kHz. If the duty cycle is 50%, determine: a) Average output voltage b) RMS output voltage c) Chopper efficiency d) The effective input resistance of the chopper

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Question:

 A step down DC chopper has a resistive load of R = 15 ohm and input Vdc = 200 V. When the chopper remain ON, it's voltage drop is 2.5V. The chopper frequency is 1 kHz. If the duty cycle is 50%, determine: 

a) Average output voltage 

b) RMS output voltage 

c) Chopper efficiency 

d) The effective input resistance of the chopper

Answer:
We can get answers directly by applying relevant formulas as shown below. 





(a) Average output voltage = 98.75 V

(b) RMS output voltage = 139.6536 V

(c) Chopper efficiency = 98.75%

(d) The effective input resistance = 30.3799 ohm


Additional information :

Waveforms for step down chopper are shown below :

For any queries regarding above solution please comment below. Thank you! 

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