| 摘要 |
<p>A circuit for increasing the flow of telephone line current in telephone systems which utilize reverse battery supervision and the grounding of the telephone line at the subscriber station for supervisory or control purposes. Power booster networks connected in series with respective sides of a telephone line each include a semiconductor switch for controlling the flow of current toward the subscriber station and a semiconductor switch for controlling the flow of current away from the subscriber station. A DC auxiliary source is connected in series with one switch in each power booster network. The conduction of the different switches is controlled in accordance with the voltages present in the telephone system to direct telephone line current flow through that one of the DC auxiliary sources which is in power aiding relationship to said current flow despite changes in the direction of current flow in one or both sides of the telephone line.</p> |
