Constant current pulse-width modulation lighting system and associated methods
First Claim
Patent Images
1. A lighting circuit comprising:
- a constant current power source;
a first set of light-emitting elements electrically coupled with the constant current power source;
a first drive circuit electrically coupled to the first set of light-emitting elements in parallel;
a second set of light-emitting elements serially electrically coupled to each of the first set of light-emitting elements and the first drive circuit; and
a second drive circuit serially electrically coupled to each of the first set of light-emitting elements and the first drive circuit and electrically coupled to the second set of light-emitting elements in parallel;
wherein the first drive circuit is configured to receive a first control input;
wherein the first drive circuit is configured to operate the first set of light-emitting elements responsive to the first control input;
wherein the second drive circuit is configured to receive a second control input;
wherein the second drive circuit is configured to operate the second set of light-emitting elements responsive to the second control input;
wherein the first drive circuit is configured such that electricity will flow to each of the second set of light-emitting elements and the second drive circuit through the first drive circuit when the first control input is in a first state, and through the first set of light-emitting elements when the control input is in a second state.
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Abstract
A lighting system comprising a constant current power source one or more sets of light emitting elements, and associated circuitry. The light emitting elements may be light emitting diodes (LEDs) that have been selected to emit light having specific wavelengths corresponding to specific colors. The lighting system may selectively control the intensity of each set of LED by utilizing pulse-width modulation. The sets of LEDs may be serially connected and selectively operated independently of each other set of LEDs.
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Citations
20 Claims
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1. A lighting circuit comprising:
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a constant current power source; a first set of light-emitting elements electrically coupled with the constant current power source; a first drive circuit electrically coupled to the first set of light-emitting elements in parallel; a second set of light-emitting elements serially electrically coupled to each of the first set of light-emitting elements and the first drive circuit; and a second drive circuit serially electrically coupled to each of the first set of light-emitting elements and the first drive circuit and electrically coupled to the second set of light-emitting elements in parallel; wherein the first drive circuit is configured to receive a first control input; wherein the first drive circuit is configured to operate the first set of light-emitting elements responsive to the first control input; wherein the second drive circuit is configured to receive a second control input; wherein the second drive circuit is configured to operate the second set of light-emitting elements responsive to the second control input; wherein the first drive circuit is configured such that electricity will flow to each of the second set of light-emitting elements and the second drive circuit through the first drive circuit when the first control input is in a first state, and through the first set of light-emitting elements when the control input is in a second state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of operating a lighting circuit comprising a constant current power source, a first drive circuit, a first set of light-emitting elements, a second drive circuit, and a second set of light-emitting elements, the method comprising the steps of:
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operating the power source to provide current to each of the first drive circuit and the first set of light-emitting elements; transmitting a first control input to the first drive circuit; operating the first set of light-emitting elements responsive to the first control input; transmitting current to each of the second drive circuit and the second set of light-emitting elements through only one of the first drive circuit and the first set of light-emitting elements; transmitting a second control input to the second drive circuit; and operating the second set of light-emitting elements responsive to the second control input. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification