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A 3-V adaptor using a half-wave rectifier must supply a current of 0.5 A with a max- imum ripple of 300 mV. For a frequency of 60 Hz, compute the minimum required smoothing capacitor.

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onyebuchinnaji

The minimum required smoothing capacitor is determined as 27.8 mF.

Minimum required smoothing capacitor

The minimum required smoothing capacitor is calculated as follows;

Ripple amplitude is given as;

[tex]V_R = \frac{I_L}{C_1f_{in}}[/tex]

where;

  • VR is maximum ripple voltage
  • f is frequency
  • C1 is smoothing capacitor
  • I is current

[tex]C_1 = \frac{I_L}{V_Rf_{in}}\\\\C_1 = \frac{(0.5)}{(300 \times 10^{-3})(60)} \\\\C_1 = 0.0278 \ F\\\\C_1 = 27.8 \ mF[/tex]

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