CIRCUITS FOR DRIVING LIGHT SOURCES
First Claim
1. A light source driving circuit for powering a first light source and a second light source by a DC (direct current) voltage, comprising:
- a first control circuitry coupled to said first light source and said second light source; and
a second control circuitry coupled to said first light source and said second light source,wherein if said DC voltage is within a first range, then said first control circuitry controls a first switch and said second control circuitry controls a second switch to turn on said first light source and to regulate a current flowing through said first light source, wherein said first switch and said second switch are coupled to said first light source,wherein if said DC voltage is within a second range, then said first control circuitry controls a third switch and said second control circuitry controls a fourth switch to turn on said first light source and said second light source and to regulate a current flowing through said first light source and said second light source, wherein said third switch and said fourth switch are coupled to said second light source.
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Accused Products
Abstract
A light source driving circuit for powering a first light source and a second light source by a DC voltage includes a first control circuitry and a second control circuitry. If the DC voltage is within a first range, then the first control circuitry controls a first switch and the second control circuitry controls a second switch to turn on the first light source and to regulate a current flowing through the first light source. If the DC voltage is within a second range, then the first control circuitry controls a third switch and the second control circuitry controls a fourth switch to turn on the first light source and the second light source and to regulate a current flowing through the first light source and the second light source.
13 Citations
9 Claims
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1. A light source driving circuit for powering a first light source and a second light source by a DC (direct current) voltage, comprising:
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a first control circuitry coupled to said first light source and said second light source; and a second control circuitry coupled to said first light source and said second light source, wherein if said DC voltage is within a first range, then said first control circuitry controls a first switch and said second control circuitry controls a second switch to turn on said first light source and to regulate a current flowing through said first light source, wherein said first switch and said second switch are coupled to said first light source, wherein if said DC voltage is within a second range, then said first control circuitry controls a third switch and said second control circuitry controls a fourth switch to turn on said first light source and said second light source and to regulate a current flowing through said first light source and said second light source, wherein said third switch and said fourth switch are coupled to said second light source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification