摘要 |
A power-factor correction arrangement incorporates an active inductance sour ce (15) and a passive capacitance source (16) switchably connected in parallel across a source of AC power. The active and passive sources are directly interconnected at their switched ends by a resistance (30), the value of whi ch is chosen so that, when the passive source is switched into circuit while th e active source is already connected to the AC source, the current through the passive source suffers virtually no surge. |