Half-Wave Rectifier Virtual Lab

Half-Wave Rectifier – Theory, Circuit & Equations

1. Introduction

A half-wave rectifier is an electronic circuit that converts only one half (positive or negative) of an AC input signal into a pulsating DC output. It typically uses a single diode to allow current flow during only one half of the input waveform, making it simple but less efficient than full-wave rectifiers.

2. Circuit Diagram

Below is a typical half-wave rectifier circuit using a single diode and a load resistor:

A variation with a capacitor filter to reduce ripple:

3. Working Principle

• During the positive half-cycle, the diode is forward-biased and conducts current through the load.
• During the negative half-cycle, the diode is reverse-biased and blocks current, resulting in zero output.
• The output is pulsating DC corresponding to the positive half-cycles.
• A filter capacitor smooths the pulsating DC by charging to the peak voltage.

4. Waveform Diagram

The waveform shows the AC input and the corresponding half-wave rectified output:

5. Key Equations

• Peak Output Voltage (Vₘ): Vₘ = Vₛ − V_diode
• Average Output Voltage (V_avg): V_avg = Vₘ / π
• RMS Output Voltage (V_rms): V_rms = Vₘ / 2

Procedure

1. Set the AC input amplitude and frequency.
2. Adjust the Load resistance (R) and Filter capacitance (C).
3. Click Generate to simulate the rectifier.
4. The plot will show Vin (blue) and Vout (red) waveforms.
5. The ripple voltage (Vpp) will be annotated on the graph.
6. You can Export Image or Download CSV of the waveform data.

Interactive Experiment

AC Amplitude (V): Frequency (Hz): Resistance R (Ω): Capacitance C (µF):

Half-Wave Rectifier Quiz