A bridge of four ideal diodes is fed from a sinusoidal winding of root-mean-square…

PHYSICS · Multi-part · Fermi University Physics · Electricity, Magnetism & Electromagnetism · Electronics, Instrumentation & Communication · Semiconductor devices and analogue circuits

Electricity, Magnetism and Electromagnetism, Ch Alternating current: peak and rms values, the oscilloscope and rectification

Problem

A bridge of four ideal diodes is fed from a sinusoidal winding of root-mean-square value

15\,\mathrm{V}

50\,\mathrm{Hz}

, and a

4700\,\mu\mathrm{F}

smoothing capacitor is connected across its output. The load draws a current that may be taken as steady over one ripple period, and the capacitor is recharged to the peak at every crest of the rectified waveform. ((a)) Estimate the peak-to-peak ripple voltage when the load current is

0.80\,\mathrm{A}

. ((b)) Estimate the ripple when the load current is raised to

1.60\,\mathrm{A}

, the capacitor unchanged. ((c)) What capacitance would restore the ripple of part (a) at the larger load current?

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