A fully digital led lighting source drive control system and technical solution

Abstract

The invention provides an all-digital LED lighting source drive control system and technical proposal, and relates to the technical field of LED lighting source drive control technology, in particular to a large-area LED lighting source drive control technology. The programmed serial digital signal is output by the single-chip circuit to control an unlimited number of driving circuits, and the driving circuits can drive multiple LED lighting modules. It overcomes the disadvantages that the constant voltage source driver cannot achieve constant current, and the constant current source driver cannot achieve current equalization, and effectively improves the service life of the LED light source. At the same time, because the present invention adopts full digital control of a single-chip microcomputer, the drive circuit can drive multiple LED light-emitting modules connected in series to realize point-to-string control, and can also drive multiple LED light-emitting modules connected in a common anode mode. group to achieve point-to-point control. Therefore, not only can high-stability large-area lighting be easily realized, but also various forms of light changes can be realized through digital programming. If driving colored LED lamp beads, infinite changes in color can also be realized, and the application prospect is very broad.

Description

technical field [0001] The invention relates to the technical field of driving control of LED lighting sources, in particular to a driving control technology of large-area LED lighting sources. Background technique [0002] 1. The existing LED lighting source drive circuits have deficiencies. As a new generation of solid-state light source, LED is characterized by the fact that it must work under DC and low voltage conditions. The stability and consistency of the current during operation directly determines the service life of the LED. At the same time, LED is a point light source with a small lighting area. To achieve large-area lighting, it is necessary to combine many LEDs together, and the DC safety voltage should generally be below 36V. In this case, the combination of LEDs can only be used. The combination of series and parallel, according to the law of loop current in the circuit, the current flowing through each device in the series circuit is equal, and the current...

AI Technical Summary

Problems solved by technology

In the original utility model patent, a DC / DC conversion module on the control board of the single-chip microcomputer is used to generate a low voltage of 5V, which is transmitted from one level to the next through a dedicated transmission line, which brings about a problem. When the transmission distance is long (For large-area lighting sources), it will appear that the multiple independent constant current drivers mentioned later cannot work normally due to insufficient operating voltage due to road end loss.

Secondly, as mentioned above, the serial digital signals required by the multi-channel independent constant current drivers in each stage will also be attenuated due to the long transmission distance. The streaming drive just doesn't work

Images