<p>The circulation of the auxiliary circuit of a resonant pole inverter has a significant effect on the inverter performance. To reduce circulation and improve efficiency, this study proposes a three-phase resonant pole inverter with improved load adaptability, which can realize zero-voltage switching (ZVS) of switches. The design idea of the inverter is that the resonant current at low load can be reduced by adjusting the auxiliary switch, and the loss of the inverter can further be reduced. These good characteristics only require additional three cheap low-frequency switches to achieve, ensuring the low cost of the inverter. Meanwhile, the auxiliary circuit can be modularized so that it can be used as an additional module of the traditional three-phase inverter, which can improve the practicality of this inverter. This study analyzes various working states during the switching process and gives the soft-switching conditions and parameter design methods of the inverter. The experimental waveform shows that the main switch realizes the ZVS function in a wide load range, and the efficiency of the inverter under 3&#xa0;kW-load condition is 98.55%. Therefore, the proposed inverter is superior in efficiency in comparison with other similar soft-switching inverters.</p>