Lighting control for vehicle lighting device
AssigneeKoito Manufacturing Co., Ltd.
InventorsTakayoshi Kitagawa, Toru Nakayama, Yasushi Noyori
Life of this patent
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Abstract
A lighting control device for a vehicle lighting device is arranged so that loads applied to switching regulators are about equal when driving multiple semiconductor light sources (e.g., LEDs) as multifunctional lamps through the switching regulators. The LEDs are divided into two groups. The LEDs belonging to the first group are driven to be turned ON through a first switching regulator and the LEDs belonging to the second group are driven to be turned ON through a second switching regulator. Maximum values of power to be supplied to the LEDs are set to be about equal to each other, and loads to be applied to the switching regulators are about equal to each other.
Claims12
A lighting control device of a vehicle lighting device, the lighting control device comprising:
- a plurality of switching regulators for supplying power to semiconductor light sources;
- a switching regulator control portion for controlling output voltages of the switching regulators;
- and
- an ON/OFF control portion connected to the semiconductor light sources and arranged to control ON/OFF operations of the semiconductor light sources based on communicating information transmitted from an external source,
- wherein at least two maximum values of power of the switching regulators supplied to the semiconductor light sources are about equal to each other.
Dependencies are inferred from the claim text.