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US 9,398,662 B2Granted
LED control system
AssigneeLucis Technologies Holdings Limited
InventorShan Guan
Life of this patent
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Abstract
A LED control circuit is disclose which comprises a silicon-controlled rectifier (SCR) configured to control a first current supplied to a LED light bulb, and a dynamic current maintenance module serially coupled to the SCR and configured to draw a second current from the SCR, the second current being inversely proportional to the first current.
Claims6
A circuit comprising,
- a silicon-controlled rectifier (SCR) configured to control a first current supplied to a light-emitting diode (LED) light bulb;
- a current measurement module configured to generate a direct current (DC) indicating voltage proportional to the amplitude of the first current;
- a controlled current load serially coupled to an anode or a cathode of the SCR and configured to draw a second current from the SCR, an amplitude of the second current being inversely proportional to an amplitude of the first current, the controlled current load including:
- a rectifier configured to convert the second current to a DC current, the DC current controllably flowing through a first transistor having a control terminal controlled by the DC indicating voltage, wherein the high the DC indicating voltage is, the lower the DC current becomes;
- a second transistor configured to controllably turn off the first transistor;
- and
- an optocoupler configured to controllably turn off the second transistor.
4 more elements
Dependencies are inferred from the claim text.