Digital tube display LED shadowless lamp circuit with double dimming function

Abstract

The invention relates to a digital tube display LED shadowless lamp circuit with a double dimming function. The digital tube display LED shadowless lamp comprises a power source input device and a power source processing device used for processing the power source input device which is connected with an LED driving device, a relay driving device and a micro processing chip, and the relay driving device is connected with the micro processing chip. The digital tube display LED shadowless lamp circuit has the advantages that the circuit is high in stability, free of stroboflash, harmless for eyes and long in service life and has the double dimming function, and starting current impact strength of LED lamp beads is reduced.

Description

technical field [0001] The invention relates to a shadowless lamp circuit, in particular to a nixie tube display LED shadowless lamp circuit with dual dimming functions. Background technique [0002] At present, the brightness control of LED shadowless lamps generally adopts a single digital PWM pulse dimming control, which has shortcomings. For example: a. There are gear adjustments, and each gear corresponds to a fixed brightness. The selectivity is poor, and it is not as uniform as stepless dimming control; b. This control method has a certain frequency, although the human eye cannot perceive it, but For the eyes, strobe is unavoidable. General shadowless lamps use LED lamp posts, or LCD display working status or gear position. Disadvantages: The LED lamp post type display gear is not intuitive, while the LCD screen type has disadvantages such as complex control circuit, poor high and low temperature resistance, high cost, and high power consumption; the common connectio...

AI Technical Summary

Problems solved by technology

[0002] At present, the brightness control of LED shadowless lamps generally adopts a single digital PWM pulse dimming control, which has shortcomings

For example: a. There is gear adjustment, each gear corresponds to a fixed brightness, poor selectivity, not as uniform as stepless dimming control; b. This control method has a certain frequency, although the human eye cannot detect it, but For the eyes, strobe is unavoidable. General shadowless lamps use LED lamp posts, or LCD display working status or gear position

Disadvantages: The LED lamp post type display gear is not intuitive, while the LCD screen type has disadvantages such as complex control circuit, poor high and low temperature resistance, high cost, and high power consumption; the common connection circuit form of the digital tube light-emitting circuit is to use several resistors , to achieve separate current limiting for each segment of digital tubes, the disadvantage is that more resistors are used; the brightness of LED shadowless lamp beads is started as a non-transitional start, and the current transiently changes from 0 to the maximum, which will have a certain impact on its life

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