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Lighting circuit

A technology for lighting circuits and lamps, applied in electrical components, instruments, static indicators, etc., can solve problems such as cost increase

Inactive Publication Date: 2004-05-19
KOITO MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when these various light sources are driven by a switching regulator, it is necessary to provide a separate switching regulator for each light source, and there is a problem of cost increase.

Method used

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Embodiment Construction

[0018] Hereinafter, the present invention will be described through the embodiments of the present invention, but the following embodiments do not limit the invention according to the claims, and the solutions of the present invention do not require combinations of all the features described in the embodiments.

[0019] figure 1 An example of the structure of a vehicle lamp 10 according to an embodiment of the present invention is shown. In the vehicular lamp 10 of this example, by selecting the number of light-emitting diodes connected in series in the vehicular lamp 10 , the light-emitting diodes are selectively turned on. The vehicle lamp 10 includes two light source blocks 58 a, b and a lighting circuit 102 . The vehicular lamp 10 may also include more light source blocks 58 . The light source block 58a and the light source block 58b are connected in series, each having one or more light emitting diodes connected in series. Also, in this example, the light source block ...

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Abstract

A lighting circuit for lighting a vehicular lamp including a plurality of light-emitting diodes, includes: a selection unit for selecting the number of light-emitting diodes to be connected in series in the vehicular lamp based on an instruction from the outside; a switching regulator for applying an output voltage based on a power-supply voltage output by an external DC power supply to the selected number of light-emitting diodes to be connected in series, so as to supply a supply current to the selected number of light-emitting diodes; and an output controlling unit for controlling the output voltage of the switching regulator based on the supply current.

Description

technical field [0001] The present invention relates to lighting circuits. In particular, the present invention relates to a lighting circuit for lighting a vehicle lamp. Background technique [0002] Conventionally, a switching regulator for supplying electric power to a vehicle lamp is known (for example, refer to Patent Document 1). The output voltage of the switching regulator is controlled, for example, as a function of the current flowing through the light source. [0003] 【Patent Document 1】 [0004] (Japan) JP-A-2001-215913 (page 3, Figure 7) [0005] Vehicles are equipped with various light sources such as high-beam light sources and low-beam light sources for headlights. Therefore, when these various light sources are driven by a switching regulator, it is necessary to provide a separate switching regulator for each light source, and there is a problem of increased cost. Contents of the invention [0006] Therefore, an object of the present invention is to p...

Claims

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Application Information

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IPC IPC(8): G09G3/14
CPCH05B45/385
Inventor 伊藤昌康石桥广生村上健太郎武田仁志
Owner KOITO MFG CO LTD