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Constant current driving circuit, LED light source and locomotive light

A constant current drive and circuit technology, applied in the field of lighting, can solve the problems of narrow input voltage range of motorcycle lights, short light source life, and large changes in power supply voltage.

Active Publication Date: 2010-05-19
OCEANS KING LIGHTING SCI&TECH CO LTD
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Problems solved by technology

[0003] The purpose of the embodiment of the present invention is to provide a constant current drive circuit, aiming to solve the problem that the power supply system of the locomotive lamp used in coal mines has a large change in the power supply voltage due to various reasons, and the input voltage range of the locomotive lamp is too narrow, which leads to the life of the light source. Short, low light efficiency and other issues

Method used

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  • Constant current driving circuit, LED light source and locomotive light
  • Constant current driving circuit, LED light source and locomotive light
  • Constant current driving circuit, LED light source and locomotive light

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Embodiment Construction

[0019] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0020] The embodiment of the present invention provides a constant current LED drive circuit with a wide range of low DC voltage input, including a BOOST circuit, an isolated DC / DC constant current drive circuit, a control power supply circuit, an undervoltage control circuit, and a low voltage switching control circuit. In the interval of the input voltage, switch and control the BOOST circuit and the isolated DC / DC constant current drive circuit to realize functions such as input undervoltage protection, constant current output and output overvoltage protection.

[0021] figure 1 The structural ...

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Abstract

The invention is applicable to the field of illumination and provides a constant current driving circuit, an LED light source and a locomotive light. The circuit comprises a BOOST circuit, an isolating DC / DC constant current driving circuit, an under-voltage control circuit, a low-voltage switching control circuit and a control power supply circuit, can support direct current input with low voltage and wide range, can effectively solve the defects of narrow input voltage range, short service life of the light source, low light efficiency, poor vibration resistance, short maintenance cycle, insufficient protection functions and the like of a locomotive light used in a coal mine, and improves safety of mine operation.

Description

technical field [0001] The invention belongs to the lighting field, and in particular relates to a constant current drive circuit, an LED light source and a locomotive light. Background technique [0002] At present, the power supply system of locomotive lights used in coal mines supplies power to multiple loads at the same time. When the locomotive is running, the contact effect of the power grid is poor, resulting in large voltage changes. Due to the narrow adjustable range of the input voltage of the existing motorcycle lights, the motorcycle lights are often extinguished due to abnormal line faults during use, and the life of the light source is short, the light efficiency is low, the vibration resistance is poor, the maintenance cycle is short, and the protection Insufficient functions, not suitable for long-term use underground, may cause safety accidents in severe cases. Contents of the invention [0003] The purpose of the embodiments of the present invention is t...

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Application Information

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IPC IPC(8): H05B37/02H05B37/00
CPCY02B20/42Y02B20/40
Inventor 周明杰陈永伦
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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