LED constant-current drive circuit employing boost constant-current drive unit and apparatus

Abstract

The invention relates to an LED constant-current drive circuit employing a boost constant-current drive unit and an LED apparatus containing the same. A direct-current power supply of the LED constant-current drive circuit provides a long-distance light end power supply and a short-distance light end power supply; a reversed polarity protection unit carries out reversed polarity protection on the LED constant-current drive circuit; a boost constant-current drive unit carries out boost constant-current processing on the long-distance light end power supply or the short-distance light end power supply that passes through the reversed polarity protection unit and provides the long-distance light end power supply or the short-distance light end power supply after the boost constant-current processing for an LED illumination unit, thereby driving the LED illumination unit; a long-distance short-distance light unit receives the long-distance light end power supply or the short-distance light end power supply that is provided by the direct-current power supply and controls the LED illumination unit to carry out switching between the long-distance light end and the short-distance light end. According to the LED constant-current drive circuit and the LED apparatus containing the same, long-distance and short-distance light adjustment of the LED illumination module can be realized. Characteristics of simple structure and stable performance are realized.

Description

technical field [0001] The invention relates to the field of LED automobile lighting, in particular to an LED constant current drive circuit using a boost constant current drive unit and an LED device including the circuit. The invention also includes an LED automobile lamp using the circuit. Background technique [0002] In lighting applications, LED is considered to be one of the most potential light sources at present because of its characteristics of high luminous efficiency, long life, high brightness, energy saving, environmental protection and durability. With the wide application of LEDs in car lights, in terms of signal lights such as brake lights, position lights, turn lights, high-mounted brake lights, daytime running lights, etc., it is usually necessary to connect multiple LEDs in series. There is this requirement in automotive regulations: one Or a few LED failures, if the rest of the lights have brightness, they should still meet the light distribution requir...

AI Technical Summary

Problems solved by technology

The far and near light switching circuit mostly uses two constant current drive circuits, and realizes the far and near light switching by controlling one of the control circuits, and a few use a single driving circuit to realize the far and near light switching, but there are many components and the circuit is complicated. Connected to the power supply, which makes it inconvenient to use, and the drive circuit is always in a charged working state, causing excessive power consumption

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