| 摘要 |
The invention includes a method of identifying at least one selected frequency, determining a number of steps and the direction of each step, calculating a plurality of stepping angles as a function of the at least one selected frequency, the number of steps, and the direction of each step, and producing a multi-frequency voltage waveform as a function of the stepping angles, the waveform containing the at least one selected frequency. The apparatus of the invention includes a processor, a plurality of gate drivers coupled to the digital processor, a plurality of switching circuits coupled to the plurality of gate drivers, and a plurality of DC sources coupled to the plurality of switching circuits. |
