| 摘要 |
<p>An illumination level control device (10) is disclosed which sequentially reduces the illumination level of a multi-bulb lamp (12). The illumination level control device (10) incorporates two D flip-flops (38, 40) configured in a master-slave relationship wherein the two D flip-flops (38, 40) change their respective states when the clock (60) sends a positive-edge of the clock signal thereto. A portion (58) of the device (10) sets the two D flip-flops (38, 40) when the wall switch (22) is off for more than a predetermined time. In the case of a three bulb (14, 16, 18) lamp (12), a zero state preventor (56) prevents all of the bulbs (14, 16, 18) from being turned off when the wall switch (22) is in the ON position. The zero state preventor (56) effectively eliminates the state wherein the outputs of both of the two D flip-flops (38, 40) are low.</p> |
