screw in led bulbs and led tree

As people work, study, leisure and entertainment environment, continuous improvement and beautification of the city, lighting engineering are constantly changed. Electronic fireworks trees as landscaping, lighting project is an important landscape, has been the focus. However, the existing electronic fireworks tree is a low-voltage small light bulb as a light source, and highlights the large power consumption, short life, easily damaged, and the lack of color, serious shortcomings in actual use.

LED is an excellent display, long life, energy-saving, high brightness, a variety of luminous colors, fast response and low driving voltage. Low-voltage small light bulbs replaced with LED lights source device simulation fireworks tree, not only can overcome its shortcomings, but also has power-saving, long working life, high brightness, multi-light-emitting color, fast response, etc., and save a lot of energy also can make the work of electronic fireworks more colorful and fascinating.

screw in led bulbs and led tree

Embedded microprocessor with LED display electronic fireworks tree controller is at the core, supported by appropriate drive circuit composed of. The controller can be under the control of the dedicated control software, the corresponding work.

 

A hardware circuit design

In order to ensure a good system to maintain performance and meet the system expansion requirements, LED flood lights electronic fireworks tree controller hardware circuit design, the modular design of the insert plate. The main control circuit board and the drive circuit board is divided into two flapper, each completed independent of the different functions of the two flapper in accordance with the geometric dimensions is equivalent to the size of the PCB design. An LED electronic fireworks tree controller requires only a main control circuit board and a number of pieces of the drive circuit board (depending on the size of the LED electronic fireworks tree). The main control circuit board to control the various driver circuit board through a custom bus. In practical work, the main control circuit board and the drive circuit board inserted in the “cage” rail between each flapper 26-pin flat cable to bus interconnect, and thus can be easily system expansion and system maintenance becomes simple and fast.

1.1 the main control circuit board design

LED electronic fireworks tree is embedded microprocessor 89C52 (IC5) core data bus only export the data of the data bus and address bus in the drive through the 74HC244 bus driver (IC1, IC2) should be into the interconnection bus in order to increase the anti-jamming capability of the system. Programmable gate array chip GAL16V8 (IC3) as the output of high-end chip address decoder can simplify the decoding circuit but also to ensure the uniqueness of each output chip address decoder. Hardware “watchdog” timer circuit using RC oscillator fluctuations in counter, the CMOS chip CD4060 (IC4) mainly consisting of C1, R1 and VD2 composed of a power-on reset circuit. Change the value of R2 or C3 can fine-tune the working hours of the “watchdog” timer, change the VD3 positive pin to the CD4060 output pin connection location can be multiplied to change the working hours of the “watchdog” timer. Jumper switch K1 is mainly used to simulate the display shells to launch the process of rate setting, the jumper switch K2 is given for the analog display shells at high altitude explosion speed. Bus interconnection can be achieved through a dedicated interface (Z1). LED electronic fireworks tree of the main control circuit board circuit diagram shown in Figure 1.

 

1.2 drive control circuit board design

The circuit of the drive circuit board circuit schematic shown in Figure 2. In order to facilitate system expansion, the drive circuit using slot structure design, each output flapper selection the four TPIC6B273 data latches, power driver and output. TPIC6B273 as the combination of 74LS273 and MC1413 (MC1413 only 7 channels output driver TPIC6B273 for 8-channel output driver), which is produced by the U.S. TI Company set eight data latches, power driver for one of the 8-channel D-type trigger device power output device has eight data latches, the composite data-driven output control. Therefore, the application circuit design of the device is very simple.

Figure 2, by comparison decoding chip 74HC688 (IC2) and a 2-4 decoder chip 74HC393 (IC6) and jumper switch K1 matched to complete the decoding of the variable address, and can select the output driver chip (IC1 IC3, IC4 and IC5), strobe, data latches. As a result of the six variable address decoder, LED electronic fireworks tree controller can be expanded to drive 26 = 64 driver board.

LED working status of the electronic fireworks tree is short-term dynamic work status, and selection of ultra-high brightness LED tubes as a light-emitting element, set its short-term transient operating current of 45mA (3 ~ 4 times the rated static operating current), mixed the average tube with colored LED voltage drop of 2.5 volts, the chip each output (load basis TPIC6B273, performance, and current limit) to drive three parallel (3 × 45 = 135mA <150mA), and (according to TPIC6B273 load voltage limit) 20 series LED (2.5 × 20 = 50V). Thus, every one of TPIC6B273 drive output can theoretically drive the LED is:  2.5 × 20  × 3 = 150. In fact, in order to work reliable derating choose to drive half the number of LED (80). Fireworks tree of each electronic driver board has four driver chips, each chip eight, each electronic fireworks tree driver board to drive the LED is: 80 × 8 × 4 = 2560. Can be the basis for the design of electronic fireworks the size of the tree (using the number of LED’s) to select a different number of drive circuit board.

2 control software design

LED electronic fireworks tree by the trunk (for analog display shells fired off process) and branches (for simulation display shells at high altitude explosion landscape) and two display parts. Electronic fireworks tree work at night, as the branches of the support body, the trunk has been extremely vague on the branches and trunks of different LED display light of the source of the controlled work will simulate the entire work process display shells from launch to explosion .

The main task of the electronic fireworks tree software design is the process of the work of the analog display shells (fired – explosion), especially in high-altitude explosion landscape. The design  first high-altitude landscape named (such as the dream world, earth red, sky full of stars, etc.)  drawing and designing their specific work processes and phenomena according to their landscape, and so to prepare the appropriate display software modules. An electronic fireworks tree 10 to 16 display modules can be designed to increase the display pattern. Enable the viewer to work long hours in order to protect the electronic fireworks tree boring, each work cycle randomly generate a display module order coexist in a linear table, the control procedures in order to check the data in the linear worksheet Decide which one module. Vary due to display the working status of the working module, Figure 3 gives only the main workflow of the electronic fireworks tree.

3 Conclusion

The LED electronic fireworks tree and its controller after prolonged use in the winter, summer and harsh environmental conditions proved that the system is reliable, prominent, obvious advantages.