Driving system of automobile lamp and driving method thereof

Abstract

The invention discloses a driving system of an automobile lamp and a driving method thereof. The driving system comprises an automobile lamp lens, a prism, an LED array module group, a PD photoelectric detector and an APC driving module. The prism is arranged between the automobile lamp lens and the LED array module group. The PD photoelectric detector is arranged at one side of the prism. The light emitted by the LED array module group is split into two parts through the prism: one part of light is emergent through the automobile lamp lens, and the other part emits to the PD photoelectric detector. The PD photoelectric detector acquires the intensity of light emitted by the LED array module group in real time so as to generate a voltage signal to be fed back to the APC driving module. The APC driving module generates corresponding driving current according to the voltage signal to adjust the luminescent brightness of the LED array module group so that the luminous efficiency of the LED array module group is enabled to be constant without attenuation of the luminous efficiency caused by long-time working of the LED array module group.

Description

technical field [0001] The invention relates to the technical field of car lamp control, in particular to a driving system and a driving method for a car lamp. Background technique [0002] At present, the driving methods of LED lighting lamps can adopt three schemes: resistor current limiting, linear voltage regulator and switching converter. The three driving methods have their own advantages and disadvantages. For example, the resistance current limiting scheme is suitable for low-efficiency applications, but it requires extremely high efficiency, and this method is not used in automotive lighting systems with a wide input voltage range; linear regulators only It is suitable for low current or LED forward voltage drop slightly lower than the power supply voltage, but it also has the problems of efficiency and small input voltage range; switching converter has the characteristics of flexible circuit topology, high efficiency and wide input voltage. Therefore, considering ...

AI Technical Summary

Problems solved by technology

The three driving methods have their own advantages and disadvantages. For example, the resistance current limiting scheme is suitable for low-efficiency applications, but it requires extremely high efficiency, and this method is not used in automotive lighting systems with a wide input voltage range; linear regulators only Suitable for low current or LED forward voltage drop slightly lower than the power supply voltage, but there are also problems with efficiency and small input voltage range; switching converters have the characteristics of flexible circuit topology, high efficiency and wide input voltage

[0003] Although the current mainstream automotive LED headlight drive circuits use switching converters, none of them can solve the problem of LED light efficiency attenuation due to long-term work of LED modules.

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