US2015180354A1PendingUtilityA1

Low Current Thyristor-Based Dimming

47
Individually held — no corporate assignee on recordPriority: Apr 11, 2009Filed: Mar 9, 2015Published: Jun 25, 2015
Est. expiryApr 11, 2029(~2.7 yrs left)· nominal 20-yr term from priority
Inventors:Laurence P. SadwickWilliam B. Sackett
H02M 3/33515H05B 45/3725H05B 45/382H03K 17/72Y02B20/30
47
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Claims

Abstract

An apparatus for low current thyristor-based dimming includes a thyristor, a secondary load switchably connected to an output of the thyristor, and a sensor connected to the secondary load. The sensor is adapted to connect the secondary load to the thyristor when the output of the thyristor falls below a predetermined level.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A method of controlling power to a load, the method comprising:
 monitoring an output of a thyristor-based dimmer;   determining whether the output meets a predetermined condition; and   connecting a secondary load to the output while the output meets the predetermined condition.   
     
     
         2 . The method of  claim 1 , wherein the determining comprises identifying when a current level through the output falls below a predetermined level. 
     
     
         3 . The method of  claim 1 , further comprising isolating a primary load output from the dimmer output through a transformer, wherein the determining comprises identifying when a current level through the primary load output falls below a predetermined level, the method further comprising level shifting a low current indication signal. 
     
     
         4 . The method of  claim 3 , wherein the determining further comprises identifying when a current level through the dimmer output falls below a predetermined level. 
     
     
         5 . The method of  claim 1 , wherein the determining comprises identifying when a current level through the output and a voltage level at the output both fall below a predetermined level. 
     
     
         6 . The method of  claim 1 , wherein the determining comprises identifying when a current level through the output falls within a predetermined range. 
     
     
         7 . The method of  claim 1 , further comprising disconnecting the secondary load from the output while the output does not meet the predetermined condition.

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