| 摘要 |
<p>An efficient method and circuitry for transferring various levels of power across a high voltage isolation barrier. In one embodiment of the invention, a data access arrangement (DAA) is provided with system side circuitry that provides power to line side circuitry via the high voltage isolation barrier. In one embodiment of the invention, a regulator is provided in series between an isolation transformer and the line side circuitry for purposes of regulating the supply voltage provided to the line side circuitry. Further, the amount of power transferred across the isolation transformer may be varied in accordance with the invention by varying the frequency and/or duty cycle of differential transformer driver signals. In an alternate embodiment of the invention, a single-ended pulse is applied to the primary side of the transformer to effectuate power transfer.</p> |
