Single-Phase Full-Bridge Inverter with Bipolar PWM Modulation

This circuit demonstrates a single-phase full-bridge inverter based on bipolar PWM modulation, which efficiently converts DC power to AC power. The inverter achieves this by feeding DC input into the full-bridge configuration and applying bipolar PWM modulation to generate AC output with controllable frequency and amplitude. In code implementation, this typically involves generating complementary PWM signals for diagonal transistor pairs (Q1-Q4 and Q2-Q3) with variable duty cycles to create the alternating output waveform. The bipolar PWM approach offers simpler control logic compared to unipolar modulation, as all four switches operate during each switching cycle. Key advantages include simplified implementation, high reliability, and excellent efficiency, making this modulation technique widely adopted in inverter circuit designs. The algorithm typically uses a triangular carrier wave compared with a sinusoidal reference signal to determine switching instants, with the modulation index controlling output voltage amplitude and carrier frequency determining output frequency.