Vehicle lamp and step-down driving circuit for vehicle lamp

Abstract

The invention provides a vehicle lamp and a voltage reduction driving circuit for the vehicle lamp, the circuit comprises a voltage reduction module, a driving module and a control module, the voltage reduction module is respectively connected with the driving module and the control module, the voltage reduction module is connected with a power supply, and the voltage reduction module is used for carrying out voltage reduction processing on the power supply so as to output a constant voltage; the driving module is used for outputting constant current; and the control module is used for controlling the driving module to drive the OLED light source to work according to the control signal. According to the driving circuit disclosed by the invention, the driving module can be always kept in a constant current output state with high current precision, low power consumption and high efficiency under different input direct current voltages even in a maximum constant output current state, and the requirements of a vehicle electronic application environment are met.

Description

technical field [0001] The invention relates to the technical field of vehicle lamps, in particular to a step-down driving circuit for vehicle lamps and a vehicle lamp. Background technique [0002] With the popularization of automotive OLED (Organic Electroluminesence Display, organic light-emitting semiconductor) lighting applications, it will become the fourth-generation light source after incandescent lamps, fluorescent lamps, and LEDs. There will be more OLED applications in lamps and higher performance requirements. OLED is a For a plane light source, the inside of the screen can be divided into several light-emitting areas, and each light-emitting area is driven by a high-side drive. When the number of light-emitting surfaces in the OLED screen increases, the current increases, and the dynamic effect becomes complicated, in the process of rising wide voltage input range, most of the voltage drop in the circuit will be concentrated on the OLED driver chip, and the powe...

AI Technical Summary

Problems solved by technology

When the number of light-emitting surfaces in the OLED screen increases, the current increases, and the dynamic effect is complicated, in the process of increasing the wide voltage input range, most of the voltage drop in the circuit will be concentrated on the OLED driver chip, and the power will increase with time. As it increases, the heat dissipation management and power consumption of the driver chip itself will be more severe, which cannot meet the requirements of low power consumption, high efficiency and stable output.

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