Power supply system and method for automotive LED lighting systems
An automotive lighting assembly receiving light from a power source and for producing light. The automotive lighting assembly includes a first lighting circuit which is operatively connected to the power source for emitting light as a function of electric current. A second lighting circuit is operatively connected to the power source independently from the first lighting circuit. The second lighting circuit emits light as a function of the electric current. The automotive lighting assembly also includes a controller which is electrically connected between the power source and the first and second lighting circuits for independently operating the first and second lighting sources to emit a chosen amount of light in a chosen direction.
1. An automotive lighting assembly receiving light from a power source and for producing light, said automotive lighting assembly comprising:
a first lighting circuit operatively connected to the power source for emitting light as a function of electric current;
a second lighting circuit operatively connected to the power source independently from said first lighting circuit, said second lighting circuit emitting light as a function of the electric current; and
a controller electrically connected between the power source and said first and second lighting circuits for independently operating said first and second lighting sources to emit a chosen amount of light in a chosen direction;
wherein each of said first and second lighting circuits includes a lighting element electrically connected to a drain of a transistor, and each of said first and second lighting circuits includes a resistor electrically connected to a source of said transistor and ground, said first and second lighting circuits further including a capacitor operatively connected between ground, said controller and a gate of said transistor to regulate voltage levels at said gate based on charged stored by said capacitors.
2. An automotive lighting assembly as set forth in claim 1 including a reference voltage circuit for comparing voltage from said controller against a predetermined threshold.
3. An automotive lighting assembly as set forth in claim 2 wherein each of said lighting elements includes a light emitting diode.
4. An automotive lighting assembly as set forth in claim 2 wherein one of said first and second lighting circuits emits a high beam.
5. An automotive lighting assembly as set forth in claim 4 wherein the other of said first and second lighting circuits emits a low beam.
6. An automotive lighting assembly as set forth in claim 5 including a feedback loop for sensing the voltage across each of said resistors.
7. An automotive lighting assembly as set forth in claim 6 wherein said feedback loop is electrically connected to said controller.
8. An automotive lighting assembly as set forth in claim 7 wherein said feedback loop includes a first and second feedback circuits electrically connected to said first and second lighting circuits, respectively.
9. An automotive lighting assembly as set forth in claim 8 wherein each of said first and second lighting circuits includes a plurality of lighting elements.