Analysis of the design concept of switching power supply for outdoor LED display

　　If the screen is small and the processor has enough I/O ports available, each I/O port can be connected to a strobe terminal. If the screen is large or the processor does not have many I/O ports, it can be strobed through decoding. For example, when 8 8×8 dot matrix LEDs form an 8×128 dot matrix LED screen, the direct strobe method requires 64 I/O ports, while the decoded strobe method only requires 6 I/O ports.

　　software design:

　　The characters displayed on the 8×8 dot matrix LED screen need to be converted into actual display data through the mode of taking. This process can be achieved through the Pcto LCD 2002 software, which is a LCD font generation software, and is also suitable for font generation for dot matrix LED large screens. Here, the specification of the generated English characters is selected as 8×8 dot matrix, and the mode of taking is set to cathode (lit bit is 1), column by column and forward (high bit first).

　　Hardware circuit:

　　In the LED display system, an 8×8 display screen is used, so 8 strobe I/O ports are used, and the strobe mode adopts independent strobe mode. The strobe signal is provided through the I/O port of the software Atmega16. Atmega16 does not need to add its drive circuit, and the software atmega16 has the ability to drive directly.

　　By studying the display system of the LED display, the focus is on understanding the display dynamics of the LED large screen. Two timers are used to control the brightness of the display and the dynamic shift speed of the displayed characters. The schematic diagram of the LED large screen display system is designed under DXP 2004. The displayed characters can be modeled by Pcto LCD 2002 software. When designing the system, according to the actual LED screen type and circuit connection settings, the appropriate cathode modeling method is selected. Using LED switching power supply, applicable laws, regulations and standard requirements, it lays the foundation for evaluating and reviewing the design safety of newly developed products and scientifically and effectively monitoring product quality; it has great guiding significance for actively responding to technical trade barriers and helping enterprises improve their quality management level, quality control capabilities and wall-breaking response capabilities.