Led drive circuit with a programmable input for led lighting
AssigneeSystem General Corp.
InventorsTa-Yung YANG, Chuh-Ching LI, Ming-Chieh LEE, Kuo-Hsien HUANG
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Abstract
A LED drive circuit according to the present invention comprises a controller and a programmable signal. The controller generates a switching signal coupled to switch a magnetic device for generating an output current to drive a plurality of LEDs. The programmable signal is coupled to regulate a current-control signal of the controller. The switching signal is modulated in response to the current-control signal for regulating the output current, and the level of the output current is correlated to the current-control signal.
Claims12
A LED drive circuit comprising:
- a controller generating a switching signal coupled to switch a magnetic device for generating an output current to drive a plurality of LEDs;
- and
- a programmable signal coupled to regulate a current-control signal of the controller;
- wherein the switching signal is modulated in response to the current-control signal for regulating the output current, and the level of the output current is correlated to the current-control signal.
The LED drive circuit as claimed in claim wherein the controller comprises a sample-and-hold circuit to sample a current feedback signal for generating the current-control signal;
- the current feedback signal is correlated to a switching current of the magnetic device;
- wherein the sample-and-hold circuit stops sampling the current feedback signal once an AC input of the LED drive circuit is lower than a low-voltage threshold.
A LED circuit comprising:
- a controller generating a switching signal coupled to switch a magnetic device for generating an output current to drive a plurality of LEDs;
- and
- a programmable signal coupled to control a reference signal of the controller;
- wherein the switching signal is modulated in response to the reference signal, and the level of the output current is correlated to the reference signal.
A LED driver comprising:
- a controller generating a switching signal coupled to switch a transformer for generating an output current connected to drive a plurality of LEDs;
- and
- a programmable signal coupled to modulate a current input signal;
- wherein the switching signal is controlled in response to the current input signal for regulating the output current.
Dependencies are inferred from the claim text.