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Lighting circuit and vehicle lamp

A lighting circuit and circuit technology, applied in vehicle components, electric light sources, headlights, etc., can solve problems such as difficult electromagnetic noise countermeasures, and achieve the effect of suppressing frequency fluctuations

Active Publication Date: 2018-03-09
KOITO MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the output voltage V OUT changes, the switching transistor M 1 The switching period T ON +T OFF , In other words the switching frequency f SW Fluctuation, measures against electromagnetic noise become difficult

Method used

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  • Lighting circuit and vehicle lamp
  • Lighting circuit and vehicle lamp
  • Lighting circuit and vehicle lamp

Examples

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Embodiment Construction

[0060] Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. The same or equivalent structural elements, members, and processes shown in the drawings are assigned the same reference numerals, and redundant descriptions are appropriately omitted. In addition, the embodiment does not limit the invention but is an example, and all the features and combinations described in the embodiment are not necessarily the essence of the invention.

[0061] In this specification, the so-called "the state in which part A is connected to part B" includes not only the case where part A and part B are physically connected directly, but also includes the case where part A and part B are connected via a channel that does not substantially affect their electrical connection state. Indirect connection to other parts that affect other parts, or other parts that do not impair the functions and effects achieved by their combination.

[0062...

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Abstract

The present invention provides a vehicle lamp capable of suppressing frequency fluctuation of a switching converter. A boost converter (410) having an ADJ terminal boosts a power supply voltage to generate a direct current voltage (VDC) stabilized at a variable target voltage corresponding to voltage of the ADJ terminal (VADJ), a buck converter (430) receives the direct current voltage (VDC) to supply a driving current (ILAMP) to the light source (310). A hysteresis controller having a hysteresis control mode is configured to stabilize the driving current (ILAMP) between a peak value and a bottom value around the target current and to change a difference between the peak value and the bottom value such a switching frequency of the buck converter (430) approaches a constant value, and a voltage adjusting circuit (460) is configured to dynamically change the voltage of the ADJ terminal (VADJ) of the boost converter (410) according to an output voltage (VOUT) of the buck converter (430).

Description

technical field [0001] The present invention relates to lamps used in automobiles and the like. Background technique [0002] Lamps for vehicles are usually capable of switching between low beam and high beam. The low beam is the light that illuminates the nearby area with a specified illuminance. It is stipulated in the light distribution regulations that it will not cause glare to the reverse vehicle and the front vehicle, and it is mainly used when driving in urban areas. On the other hand, the high beam is light that illuminates a wide area ahead and a distant place with a relatively high illuminance, and is mainly used when driving at high speed on a road with oncoming traffic and few traffic ahead. Therefore, the high beam is superior to the low beam in terms of driver's visibility, but there is a problem of causing glare to the driver of the vehicle and pedestrians existing in front of the vehicle. [0003] In recent years, an ADB (Adaptive Driving Beam) technology ...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/60H05B45/00B60Q1/1423B60Q2300/42B60Q2300/45H05B45/38H05B45/375H05B45/48B60Q1/1415
Inventor 村松隆雄菊池贤
Owner KOITO MFG CO LTD
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