Electric lamp and discharge devices: systems – Plural load device systems – Plural discharge device loads
Patent
1993-03-01
1994-11-01
Look, Edward K.
Electric lamp and discharge devices: systems
Plural load device systems
Plural discharge device loads
315313, 315362, H05B 4138
Patent
active
053610199
ABSTRACT:
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.
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Angott Paul G.
Xydis Thomas G.
Dimango Products Corporation
Larson James A.
Look Edward K.
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