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In a highly competitive society, how to deal with the contradiction between environmental protection and cost reduction has become very important. In the process of industrial and civil lighting equipment, the voltage fluctuations, power failure, surge, and sloshing of the power grid may cause damage to the lamps, waste of energy, and light pollution. These have caused the loss of human and material resources in vain, so it is necessary to develop a lighting controller, and a smart lighting controller (SLC) came into being.
Introduction to the principle of 1SLC In the actual work, we often encounter this situation. When the grid voltage is used during the daytime, the voltage drops, and at night, the voltage gradually increases with the decrease of the power consumption. Lighting fixtures are often not equipped with corresponding voltage control equipment, which causes the lamps to work in the same state regardless of the voltage level, and the brightness is difficult to meet the requirements. Especially in places where indoor lighting is required, the brightness during the day is not enough, and the brightness at night is excessive. This situation not only causes light pollution, but also accelerates the aging of lamps and wastes energy. The SLC developed for this situation has solved this contradiction better. Its core device is a single-chip microcomputer, the peripheral circuit adopts digital device, the power output component selects high-power solid soft start nighttime daily voltage 'transfiable fi full pressure start 1 touch sweet voltage f midnight after midnight: dawn lighting illumination voltage and time relationship diagram Turn off the light state relay (SSR). Real-time monitoring of light intensity, time and voltage changes, using waveform modulation technology to achieve timed on and off lights, light control, manual switch lights, soft start, soft stop, voltage regulation, step-down operation and other functions. For the phenomenon of sloshing, surge, etc. in the power grid, it can also control the voltage change in time by calling the corresponding program, which can well match the metal halide lamp, fluorescent lamp and incandescent lamp used daily.
The solid line in the middle is the working curve of the SLC in normal operation, and the curve can be adjusted arbitrarily. Energy savings are achieved by reducing the rms power of the luminaire while maintaining the peak voltage. During the period from the turn-on to the turn-off, the product of the area between the dotted line and the solid line and the operating current is the power saving of the SLC (the dotted line is the daily operating voltage without the controller, and the solid line is the voltage output by the SLC).
2 hardware and software design 2.1 hardware selection controller's main control chip selects ATMC company's ATC89C52 single-chip microcomputer, contains 8KFLASH memory can modify the program at any time according to the work needs, to meet user requirements.
The light intensity sensor is a photoresistor, and after being transformed, the sample is kept and sent to the A/D processing to be a signal recognizable by the single chip microcomputer. The voltage sampling is similar to this, that is, the voltage is isolated and low-pass filtered and sent to the A/D converter.
The A/D converter chip uses TI's TLC2543 and contains 14 channels. Count 11 external analog inputs, 3 internal self-test voltages. An on-chip integrated sample-and-hold circuit can be easily connected to the microcontroller.
16165, which integrates LCD controller, dot matrix driver and character memory, can display 16 ASC codes and corresponding graphic symbols at the same time.
The connection mode with the microcomputer is RS232 interface, and the interface chip is MAX 232 of MAXIM. It converts the output signal of the single chip into standard signal and drives the RS232 interface.
2.2 Software design software design adopts modular structure, mixes assembly language and C language programming, and writes main control program module, key control program module and display program module. It has good portability, and it is convenient for users to adjust to the application scheme of the midnight light and the night light with bypass. This not only ensures the illumination, but also adjusts the output voltage reasonably, which not only prolongs the life of the lamp, but also saves power consumption.
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