MATLAB Simulation of Half-wave Rectifier and Effect of Filter Capacitor

MATLAB Simulation of Half-wave Rectifier and Effect of Filter Capacitor

Introduction:

We delve into the MATLAB simulation of a half-wave rectifier and explore the impact of a filter capacitor on its performance.

Setting Up the Circuit:

To begin with, we set up an AC voltage source with an input voltage of 213×2213×2​ volts, ensuring a fixed peak amplitude for the AC input voltage. The frequency is set at 50 Hz, and a diode is used for rectification.

Designing the Filter:

Next, we create a series branch and connect it in parallel to form a filter circuit. This circuit includes a capacitor, which acts as the filter. The load resistance is set to 𝑅R, designed for a power output of 100 watts, resulting in a DC output voltage of 325 volts.

Voltage Measurement and Initial Simulation:

We measure both the input and output voltages using voltage measurement blocks connected to a scope to visualize the results. Initially, we simulate the model without a filter and observe the output.

Using Power Stage Designer Tool:

Subsequently, we design the filter using the Texas Instrument Power Stage Designer tool. By inputting parameters such as input power (100 watts), minimum voltage level (228 volts), and ripple voltage percentage (6.15%), we calculate the required capacitance value for the filter.

Incorporating the Filter:

After incorporating the filter into the simulation, we analyze the output voltage ripple. By comparing the simulated ripple voltage with the calculated value, we validate the effectiveness of the filter.

Exploring Load Variations:

Furthermore, we introduce an RL load and observe the system's response. The output remains consistent, indicating the filter's stability with varying load conditions.

Impact of Freewheeling Diode:

Additionally, we explore the impact of a freewheeling diode on the rectifier circuit, which effectively eliminates the negative portion of the waveform.