Simulink Toolbox Simulation

Simulation experiments are conducted using MATLAB's Simulink toolbox. First, we can implement a single-phase bridge PWM inverter circuit using the unipolar triggering method. This approach requires building separate triggering circuits for the upper and lower bridge arms, typically implemented using logical operations in Simulink blocks. Next, we can perform simulations by establishing circuit models for the load and power supply. The power supply model can be created using Simulink's voltage source blocks, while the load can be modeled using resistive or inductive components from the Simulink library. To achieve PWM triggering, we can construct a PWM trigger module using Simulink's pulse generator blocks combined with relational operators and logical gates. The trigger module implementation typically involves comparing a high-frequency carrier signal (usually triangular wave) with a modulating signal to generate appropriate switching pulses for the inverter's power devices. Finally, we can plot the relationship between fundamental wave amplitude and duty cycle. This can be accomplished using MATLAB's FFT analysis tools to extract the fundamental component from the output waveform, then using plotting functions to visualize the correlation with varying duty cycles. Through these steps, we can conduct more detailed simulation experiments and better understand the circuit's working principles.