Pre-charge lighting control circuit
A system and method for operating one or more light emitting devices is disclosed. In one example, an analog circuit outputs a voltage pulse to drive a voltage regulator in a way that may provide more consistent light intensity from the one or more light emitting devices over a range of requested lighting intensity levels.
1. A system for operating one or more light emitting devices, comprising:
an array of solid state lighting devices;
a voltage regulator including a voltage regulator input, the voltage regulator electrically coupled to the array of solid state lighting devices; and
an analog pre-charge circuit having a pre-charge circuit output, the pre-charge circuit output electrically coupled to the voltage regulator input, the analog pre-charge circuit including an pre-charge circuit input, the pre-charge circuit input electrically coupled to the array of solid state lighting devices, the analog pre-charge circuit including a timing circuit, the analog pre-charge circuit including a first capacitor and a first resistor electrically coupled to the timing circuit.
2. The system of claim 1 , further comprising a second resistor, a third resistor, and a second capacitor electrically coupled to the timing circuit.
3. The system of claim 1 , further comprising a transistor electrically coupled to the second capacitor and the third resistor.
4. The system of claim 1 , where the timing circuit including a TRIG bar input, a RESET bar input, a CONT bar input, a THRES input, a DISCH output, and an OUT output.
5. The system of claim 4 , where first resistor and first capacitor are electrically coupled to the DISCH output, and where the DISCH output is electrically coupled to the THRES input.
6. The system of claim 4 , where the second resistor and the second capacitor are electrically coupled to the TRIG bar input.
7. The system of claim 4 , further comprising a third capacitor, where the third capacitor is electrically coupled to the CONT bar input.
8. The system of claim 4 , where the OUT output is electrically coupled to an input of the voltage regulator.
9. A system for operating one or more light emitting devices, comprising:
an array of solid state lighting devices;
a voltage regulator including a voltage regulator input, the voltage regulator electrically coupled to the array of solid state lighting devices; and
an analog pre-charge circuit having a pre-charge circuit output, the pre-charge circuit output electrically coupled to the voltage regulator input, the analog pre-charge circuit including a first pre-charge circuit input, the first pre-charge circuit input electrically coupled to the array of solid state lighting devices, the analog pre-charge circuit including a timing circuit, and the analog pre-charge circuit including a voltage comparator, the voltage comparator electrically coupled to the timing circuit and the first pre-charge circuit input.
10. The system of claim 9 , further comprising a second pre-charge circuit input, the second pre-charge circuit input electrically coupled to a transistor.
11. The system of claim 10 , where the transistor is electrically coupled to a third resistor and a second capacitor, and where the second capacitor is electrically coupled to a second resistor and a TRIG bar input of the timing circuit.
12. The system of claim 9 , where the timing circuit including a TRIG bar input, a RESET bar input, a CONT bar input, a THRES input, a DISCH output, and an OUT output.
13. The system of claim 9 , where the analog pre-charge circuit includes a first capacitor and a first resistor electrically coupled to the timing circuit.
14. The system of claim 9 , further comprising a voltage divider electrically coupled to the voltage comparator.
15. A method for operating one or more light emitting devices, comprising:
supplying a voltage pulse to a voltage regulator input, a duration of the voltage pulse adjusted in response to a resistor and capacitor network and a voltage at one or more light emitting devices; and
supplying electrical power to one or more light emitting devices via the voltage regulator.
16. The method of claim 15 , where the resistor and capacitor are electrically coupled to an analog timing circuit.
17. The method of claim 15 , where the voltage pulse is provided via an analog pre-charge circuit, and further comprising:
supplying a voltage to the analog pre-charge circuit via a voltage divider, the voltage divider electrically coupled to the one or more light emitting devices.
18. The method of claim 15 , where the voltage pulse is output in only in response to a request to increase light intensity output of the one or more light emitting devices from zero to a threshold value.
19. The method of claim 15 , where the voltage of at the one or more light emitting devices is input to a comparator circuit.
20. The method of claim 19 , where the voltage pulse is provided via a pre-charge circuit, and where the pre-charge circuit includes a timer configured in a mono-stable mode.