Rectifier Ripple Voltage
By DarthVader
Date: 2025-02-13
Topic: 232 see comments
Post views: 82
A rectifier circuit converts an AC voltage signal into a pulsating DC signal (also called a rectified AC signal). A smoothing capacitor is then used to reduce the pulsations and create a more stable DC voltage.
However, even with the smoothing capacitor, some residual AC component, known as ripple voltage, remains in the signal.
- The larger the capacitance, the the smaller the ripple voltage.
Equations:
Full-wave rectifier:
Vripple = \(\frac{\color{red}{I_L}}{\color{yellow}{2fC}}\)
Half-wave rectifier:
Vripple = \(\frac{\color{red}{I_L}}{\color{yellow}{fC}}\)
Vripple = This is the peak-to-peak ripple voltage, which represents the small AC fluctuation (ripple) remaining in the DC output after smoothing with a capacitor.
IL = This is the load current, or the current drawn by the load connected to the rectifier circuit. It is typically measured in amperes (A).
f = This is the frequency of the AC input signal, measured in hertz (Hz). For a full-wave rectifier, the effective frequency of the rectified signal is twice the input frequency (because both halves of the AC waveform are used).
C = This is the capacitance of the smoothing capacitor, measured in farads (F). A larger capacitor reduces the ripple voltage because it can store more charge.
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