Street lamp energy-saving control system Street lamp energy-saving control system is a power saver specially designed for street lamp system. The energy-saving control system of street lamps is mainly composed of intelligent stepping power regulator and programmable energy-saving control system, aiming at the characteristics of inert gas lamps such as high-pressure sodium lamps. Advanced microcomputer technology is used to optimize the power supply of lamps, so that lamps can execute reasonable lighting procedures and dynamically manage the electric energy and illumination of street lamps, which greatly prolongs the life of lamps and reduces the waste of electric energy. Digital computer intelligent control programmable power-saving parameters, power adjustment, uninterrupted bypass conversion, compact structure, small volume, no mechanical adjustment structure, stable and reliable maintenance-free long-term stable work. Using power electronics technology, the power frequency autotransformer has high frequency, high efficiency and small size to achieve super power. Contactless voltage regulation is realized by power electronic devices. Using 10 digital potentiometer, the step value of voltage and voltage adjustment is 0.25 volts. Electromagnetic compatibility, pure sine wave output, smooth continuous voltage regulation. In the process of voltage regulation, energy flows in four quadrants, so it adapts to all loads such as resistance, capacitance and inductance. Using ARM 7TDMI 32-bit industrial embedded control, it is easy to transplant other chips.

Urban road lighting accounts for a large proportion of the total lighting electricity consumption. The street lighting technology in the past has many shortcomings. Because there are few pedestrians in the second half of the night, the illumination of street lamps should be reduced to avoid light pollution and affect residents' rest at night. However, the traditional street lighting in the second half of the night leads to the increase of grid voltage, and the illumination of lamps is brighter than that in the first half of the night. This not only causes the waste of electric energy, but also greatly reduces the service life of lamps due to the increase of voltage. Therefore, considering this situation, this paper designs a multi-tap voltage adjustable street lamp energy-saving device based on autotransformer. By comparing the advantages and disadvantages of various tap changers, the solid-state relay is finally adopted as the tap changer.

When the voltage crosses zero, adjust the voltage to make the voltage waveform of the street lamp continuous and smooth. The controller has the characteristics of voltage regulation and stabilization,

It has the advantages of contactless and multistage voltage regulation, and the voltage regulation range can reach more than 18%.