A Novel Current-Source Sine Wave Voltage Inverter with Soft-Switching and Low-Switching Stress

This study presents a current source inverter using soft-switching and low-switching stress techniques for inverting dc voltage into sine wave voltage. A controllable current source supplies the output capacitors and loads with high frequency switching to integrate the output sine wave voltage. Since the resonant inductor and the output capacitor are connected in parallel, the series diodes of the full-bridge switches can be omitted. Furthermore, a coupled-inductor with a low volume is utilized to reduce the circulating energy and clamped the voltage stress of the devices, regardless of whether operation is in continuous conduction mode. The experimental waveforms are provided to demonstrate the soft-switching and low-switching stress properties of all the devices. Additionally, a normal rated power with 110 V-500 W-60 Hz is provided to demonstrate the effectiveness of the output voltage with low distortion, fast dynamic regulating speed and insensitivity to load variation, even under nonlinear loads. Experimental results that the maximum power inverter efficiency exceeds 97%, and the total harmonic distortion for various load conditions falls within 2%