Back to results
US 10,375,783 B2Granted
Lighting circuit and vehicular lamp
AssigneeKoito Manufacturing Co., Ltd.
InventorsKotaro Matsui, Yasushi Noyori, Shinji Ohta
Life of this patent
Estimating the term…
Abstract
Provided is a lighting circuit that drives a first light source and a second light source connected in series with each other. A bypass switch is provided in parallel with the second light source. A constant current circuit is connected in parallel with one of the first light source and the second light source. A drive circuit supplies a drive current to a serially-connected circuit of the first light source and the second light source.
Claims14
A lighting circuit comprising:
- a first light source;
- a second light source connected in series with the first light source to form a serially-connected circuit;
- a bypass switch provided in parallel with the second light source;
- a constant current circuit connected in parallel with only one of the first light source or the second light source at a time and configured to generate a constant current;
- and
- a drive circuit configured to supply a drive current to the serially-connected circuit including the first light source and the second light source,
- wherein the drive circuit is only directly connected to an input of the first light source of the serially-connected circuit including the first light source and the second light source.
4 more elements
Dependencies are inferred from the claim text.