| 摘要 |
<p>A dimmer control device (100) is disclosed which determines when to switch a voltage level supplied to a light fixture (160) comprised of a plurality of light bulbs (162) by monitoring the phase relation between an input voltage (190) and input current (180). When the phase relation is within acceptable tolerance limits, external control inputs to lower, ..., dim, or raise the illumination level are accepted and processed. The dimmer control device(100) further compensates for warmup and startup transitions by directing input voltage (190) through relays (290) that provide full voltage until desired voltage/current phase relation is established within acceptable tolerance levels. And further provides for a full voltage output when a failure or abnormal conditions are determined.</p> |
