| 摘要 |
An active inductor for controlling transistor bridge switching carrier frequency current components in the power mains connected to a three-phase AC/DC switched bridge converter (26) includes a transformer (67) for each phase, each having a secondary (68) between the AC main and the switched bridge, the primary of which (66) is driven by a bridge (63) switched at much higher frequency in response to a synthesized waveform which ideally will completely cancel the main power bridge switching current components. Reduction of the current carrying requirement of the active inductor is achieved by providing negative feedback of the fundamental power frequency from the primary of each transformer (current sensor 75); deviations in the synthesized waveform from the ideal waveform, due to delays and distortions in real circuits and/or processing, are reduced by providing negative feedback from the resultant current (current sensor 71) (the secondary of the active filter transformer).
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