Dimmable LED constant current source driver with wide voltage range

Abstract

The invention discloses a dimmable LED constant current source driver with wide voltage range, belonging to an LED light source driver in the illuminating field. The driver comprises a voltage identification circuit, a light compensation circuit, an MCU control circuit, a temperature compensation circuit and a dimmable constant current source circuit, wherein the output ends of the voltage identification circuit, the light compensation circuit and the temperature compensation circuit are all connected with the input end of the MCU control circuit, the PWM output end of the MCU control circuit is connected with the input end of the dimmable constant current source circuit, the voltage identification circuit and the dimmable constant current source circuit are both connected into direct-current or alternating-current input voltage, the light compensation circuit is connected with a photosensitive device, the temperature compensation circuit is connected with a thermistor, and the output end of the dimmable constant current source circuit is connected with an LED light source. The invention has low cost, small volume, stable and reliable working of a system and prolongs the service life of an LED.

Description

technical field [0001] The invention relates to an LED light source driver in the lighting field, in particular to a wide voltage range dimmable LED constant current source driver. Background technique [0002] At present, under the background of global energy shortage and the country's vigorous advocacy of energy saving and consumption reduction, with the development of science and technology, the application of LED lighting products is attracting the attention of the world in the field of lighting. Small size, high luminous efficiency and other characteristics, can be widely used in household lighting, road lighting, urban night scenes and other lighting occasions. [0003] The LED light source is driven by a constant current source. At present, there are still defects in the driver technology on the market. The performance is that the input voltage range is narrow, the versatility is poor, and the use of a transformer results in a large and bulky size. Some are constant v...

AI Technical Summary

Problems solved by technology

[0003] The LED light source is driven by a constant current source. At present, there are still defects in the driver technology on the market. The performance is that the input voltage range is narrow, the versatility is poor, and the use of a transformer results in a large and bulky size. Some are constant voltage drivers, resulting in a single LED. Short circuit damages a string of LED lamp beads, high engineering maintenance costs, heavy maintenance workload, and does not have the function of adjusting the brightness of LEDs according to the ambient light, resulting in a great waste of energy

These are not only not conducive to the popularization and application of LED light sources, but also fail to tap the greatest potential of energy saving and consumption reduction

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