# Ripple Voltage in Power Supplies Quiz

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## 18 Questions

Half

Greater than

Ripple voltages

360°

Twice

### Why is a full-wave rectifier considered better than a half-wave rectifier in terms of ripple?

Lower ripple factor

24.2 V

3.84 V

Capacitor Filter

### How does a capacitor filter operate in a rectified signal circuit?

Charging when the diode is reverse biased

### What must be the PIV rating of a diode in a center-tapped full-wave rectifier?

At least twice the peak value of the input voltage

### How does the Bridge Full-Wave Rectifier differ from the Center-Tapped one?

Uses two diodes only

### What is the main function of a rectifier circuit?

Converts ac voltage into dc voltage

Silicon diodes

### What is the purpose of a clamper circuit in a rectifier system?

To add a dc level to an ac voltage

### In a half-wave rectifier circuit, when is the output signal present?

Only during half of the input cycle

### What does VDC represent in rectifier circuits?

Average or dc value

### What is the main advantage of a center-tapped full-wave rectifier over a half-wave rectifier?

Higher efficiency

## Study Notes

### Rectifiers and Filters

• A rectifier is an electronic circuit that converts AC voltage into a pulsating DC.
• Rectifiers convert a signal having zero average value into one that has a nonzero average value.
• Diodes used for rectification are called rectifier diodes, and most are made of silicon.

### Half-Wave Rectifier

• The half-wave rectifier is the simplest rectifier circuit, using only one diode.
• The output signal is present only during half the cycle.
• The frequency of the output signal is the same as the input.
• The average value of a half-wave rectified voltage is the value that a DC voltmeter measures.
• The rms value of a half-wave rectified voltage is one-half of the peak value.
• The PIV (Peak Inverse Voltage) for a half-wave rectifier must be equal to or greater than the peak value of the input voltage.

### Ripple Factor

• The ripple factor is defined as the ratio of the ripple voltage to the DC voltage.
• The ripple factor is given by the formula: r = Vr (rms) / VDC.
• For a half-wave rectifier, Vr (rms) = 0.308Vp and r = 1.21.
• For a full-wave rectifier, Vr (rms) = 0.385Vp and r = 0.48.

### Full-Wave Rectifier

• The full-wave rectifier allows unidirectional current through the load during the entire 360° of the input cycle.
• The frequency of the output signal is twice that of the input.
• The average voltage of a full-wave signal is twice that of a half-wave.
• The rms voltage of a full-wave signal is greater than that of a half-wave.

### Power Supply Filter

• A power supply filter is used to reduce the ripple voltage present in rectified signals.
• The most commonly used filters are capacitors.
• A capacitor filter is the simplest and most economical filter, which reduces the ripple by providing a steadier output voltage.

### Bridge Full-Wave Rectifier

• The bridge full-wave rectifier uses four diodes and does not require a center-tapped transformer.
• It uses the transformer and the diodes more efficiently than the center-tapped.
• The PIV rating is less than that of the center-tapped.

Test your knowledge on ripple voltage in power supplies with examples of half wave and full-wave rectifiers. Learn to calculate rms ripple voltage and understand the significance of power supply filters in reducing ripple voltage.

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