| 摘要 |
<p>Improvements to processes and devices for providing a load with an electric AC supply, without discontinuity of the AC signal. . The invention relates to the AC electric supply of a load without discontinuity from a main AC source (terminals 13,14) or an auxiliary emergencey source (terminals 15,16). When the main source is again connected to the terminals (13,14) after a failure, a reduction of the frequency of the oscillator (19) of the static DC-AC converter (19, 20,3) is caused (at 26), which frequency is compared (at 27) with that of the main source. On coincidence, the main source is connected through switches (28,24) to the primary of the transformer (1) and the static DC-AC converter is disabled (*t 23).</p> |
