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Basic key waveforms of the UPWM H-bridge inverter (fRf = 2.5 kHz, and fc = 15 kHz, mf = 6, ma = 0.9). (a) Triangular waveform comparison with 2.5 kHz cosine reference (VRf) and 180° shifted reference (-VRf). (b) Trigger signal for S1. (c) Trigger signal for S2. (d) Trigger signal for S3. (e) Trigger signal for S4. (f) Coil voltage and current and working modes (I-VIII).
