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The AC ripples can be reduced in a rectifier circuit by using capacitive filter by _________ the capacitance value and by ________ the input frequency.
increasing; increasing
decreasing; decreasing
increasing; decreasing
decreasing; increasing
increasing; increasing
The ripple voltage in a capacitor-filtered rectifier is inversely proportional to both the filter capacitance and the supply frequency. Therefore, to minimize the ripple factor, both the capacitance and the input frequency must be increased.
The ripple voltage in a capacitor-filtered rectifier is inversely proportional to both the filter capacitance and the supply frequency. Therefore, to minimize the ripple factor, both the capacitance and the input frequency must be increased.
r=43тАЛfCRLтАЛ1тАЛ тАФ where r is the ripple factor, f is the frequency, C is the capacitance, and RLтАЛ is the load resistance.
VrтАЛ=fCIdcтАЛтАЛ тАФ where VrтАЛ is the peak-to-peak ripple voltage.
The capacitive filter acts as a reservoir of charge. During the conduction interval, the capacitor charges to the peak voltage. During the non-conduction interval, it discharges through the load, providing continuous current. A larger capacitor (C) stores more energy, and a higher frequency (f) reduces the time interval available for the capacitor to discharge, both of which result in a smaller ripple voltage.
Ripple factor is inversely proportional to f and C.
Increasing f effectively reduces the discharge time of the capacitor.
Higher capacitance limits the voltage drop across the load during the off-cycle.
A full-wave rectifier is preferred over a half-wave rectifier as it has a higher ripple frequency, naturally reducing ripple magnitude.
Simple and low-cost implementation
Effective at high load resistances
High peak current through rectifier diodes
Not suitable for very low load resistances
DC power supplies
Consumer electronics
Battery chargers
Option A is correct because rтИЭf1тАЛ and rтИЭC1тАЛ.
Option B, C, and D are incorrect as they suggest decreasing parameters which would increase the ripple amplitude.
A is correct тАФ The ripple factor r is inversely proportional to both capacitance and frequency, so increasing both effectively minimizes AC ripples.
Always remember that for filter circuits, the product f├ЧC is the critical factor; high frequency switching power supplies use smaller capacitors compared to 50 Hz linear supplies because f is much higher.
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