L17_diode

# L17_diode - ESC102 Introduction to Electronics DC Power...

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DC Power Supply ESC102 : Introduction to Electronics A R. Harish Dept. of EE, IIT Kanpur Sep 6, 2010

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+ - V i + V 0 - V i Half wave Rectifier 0.7 V 1:1 Slope Voltage Transfer Characteristics V 0 =V IN - 0.7
V O V IN R 0.7V V 0 =V IN - 0.7

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D V O V S C R L Diode is forward biased Diode is reverse biased V O R L C
Output has a ripple V M V L Ripple Voltage : r M L V V V = - 1.95 r V V = Average Output Voltage : ( ) 2 R O M V V avg V 2245 - 2 ) ( 0 r M V V avg V - 2245

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V O R L C ( ) L t R C O M V t V e - = × What does ripple voltage depend on? V S D N 1 N 2 V O R L C C R V dt dV R V dt dV C L L 0 0 0 0 0 - = = +
1 (1 ) L t R C r M L M V V V V e - = - = × - V M V L t=t 1 t=0 1 L t R C L M V V e - = × Assuming that t 1 << R L C 1 1 {1 (1 )} M r M L L t V t V V R C R C 2245 × - - =

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V M V L t=t 1 t=0 1 M M r L L V t V T V R C R C = 2245 T 1 t T 2245 M r L V V fR C 2245
Example V M V L 1.95 r V V = 3 6 11.923 2.385 50 10 100 10 M r L V V V fR C - 2245 = = × × × 5 L R C T = V S D N 1 N 2 V O 1K 100 μ F

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V S D N 1 N 2 V O 1K 500 μ F Example V M V L 0.438 r V V = 3 6 11.904 0.476 50 10 500 10 M r L V V V fR C - 2245 = = × × × 25 L R C T =
What happens if the ripple is reduced by increasing C?

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• Spring '10
• A.R.Harish

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