Constant-current LED drive control circuit suitable for outdoor instrument

A technology of LED driving and control circuits, applied in the direction of electrical components, etc., can solve the problems of complex PCB lines, many discrete devices, and many interfaces, and achieve the effect of simplifying PCB design difficulty, reducing development difficulty, and simplifying control interface

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A technology of LED driving and control circuits, applied in the direction of electrical components, etc., can solve the problems of complex PCB lines, many discrete devices, and many interfaces, and achieve the effect of simplifying PCB design difficulty, reducing development difficulty, and simplifying control interface

CN112235908AInactive Publication Date: 2021-01-15WUXI I CORE ELECTRONICS

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[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0034] The present invention provides a constant-current LED drive control circuit suitable for outdoor instruments, which integrates all components into a single-chip IC, which has low cost, simplifies the difficulty of PCB design, simplifies the control interface after monolithic integration, saves IO resources of the main control device, and reduces It is difficult to develop the program of the whole machine, the constant current output of the ...

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Abstract

The invention discloses a constant-current LED drive control circuit suitable for an outdoor instrument in the technical field of integrated circuits. The constant-current LED drive control circuit comprises a power-on reset module; a control module connected to the power-on reset module; a constant current control module connected to the control module; a cathode driving module connected to the constant current control module and the control module; and an anode driving module connected to the control module. All components are integrated into a single-chip IC, the cost is low, the PCB designdifficulty is simplified, a control interface is simplified after single-chip integration, the IO resources of main control equipment are saved, the program development difficulty of the whole machine is reduced, the constant-current output of an SEG port is achieved, the LED brightness is not affected by external conditions, a high-quality display effect is achieved, a shadow elimination modulecapable of being automatically closed is designed at a COM port, and the power consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a constant current LED drive control circuit suitable for outdoor instruments. Background technique [0002] LED is a common light-emitting device, which is widely used in lighting, indicator lights, displays and so on. Generally, LED display devices used indoors use logic circuits such as 74HC138, 74HC164, and 74HC273 as controls, and conventional small-drive buffer chips such as 74HC245 are used in the drive stage. However, when using LEDs in outdoor instrumentation equipment, due to factors such as high light intensity in the outdoor environment, it is necessary to use a large current drive to make the LEDs in a high-brightness state to ensure a clear display effect. The chip cannot meet the drive current requirement. [0003] The existing device uses discrete devices to form the control logic, uses small driving devices such as 74HC138 to control the power trans...

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Application Information

Patent Timeline

15 Jan 2021

Publication

CN112235908A

IPC: H05B45/345; H05B47/165

CPC: H05B45/345; H05B47/165

Inventors: 徐晟阳; 任罗伟