Analysis of energy-saving technologies and applications of intelligent lighting control devices

introduction

Article 2, paragraph 3, of the Ministry of Construction and the National Development and Reform Commission [2004] No. 204 “Opinions on Strengthening Urban Lighting Management and Promoting Energy Conservation Work” proposes that “new lighting projects must be constructed and promoted. Efficient lighting electrical products and energy-saving control technology." According to this spirit, many types of lighting energy-saving devices have appeared in the domestic market. Among them, the most widely used is the intelligent lighting control system with compensation transformer type AC voltage regulator as the core. Its main principle is based on the fact that the gas discharge lamp is not significantly reduced in the range of allowing the pressure reduction, and the lamp is moderately used for the purpose of energy saving. The author will briefly analyze the principle of this kind of lighting control device and its application examples in street lamp design.

1. Compensation principle of transformer type AC voltage regulator

Figure 1 Compensation type non-contact lighting control schematic

Figure 2 equivalent circuit of the compensation power supply

Fig. 1 is a schematic diagram of a compensation transformer type AC voltage regulation energy-saving device, and Fig. 2 is an equivalent circuit diagram thereof. Its main principle is to connect a set of transformer coils in the main loop, and use the potential generated by it to superimpose with the main power source to change the output voltage value. The primary winding of the compensation transformer is connected by the electronic power components and the taps of the multi-tap transformer. The electronic power components are responsible for two tasks: 1. The connection of the microcomputer is commanded to be connected to the head. 2. Subdivide the voltage according to the instructions of the microcomputer—that is, adjust the conduction level and change the amplitude of the superimposed voltage to increase the voltage level and the accuracy of each level. If the tap of each stage is 5V, in the range of 5V, we can divide it into 1V/5. Since the adjustment voltage is realized by changing the conduction degree of the electronic component, the parameters such as the phase of the voltage are not changed, so the waveform of the output voltage is not changed after the adjustment.

In recent years, in large-scale shopping malls or activities, we always see the figure of "LED fan". Its appearance is similar to the fan, but it can display various patterns when rotating, and some can display dynamic 3D patterns, which is very cool. Every time we see it, we can always make people stop and watch it, which plays a very good role in publicity and promotion. So how do LED fans display patterns?

Strictly speaking, this so-called "fan" is just a vivid way to call it. In fact, it is a kind of "rotating LED light bar", and its professional name is holographic 3D smart glare screen. After power on, the "fan blade" starts to rotate, which can present a 3D image at the same time, cool and lifelike. At the same time, according to the size and color of the pattern, the LED fan can well hide its leaves, because there is no frame and no fixed screen, so the dynamic picture is like floating in the air, very realistic.

The 3D smart screen not only uses the hardware of rotating LED, but also uses the visual persistence of human eyes. For the hardware equipment of rotating LED, simply speaking, it is to calculate the change frequency of LED light according to the rotation speed of "fan blade". When different LED lights are lit at different times, different patterns will appear. The so-called visual persistence refers to that when the human eye is observing the scene, the light signal is transmitted to the brain nerve, which takes a short period of time. After the end of the role of light, the visual image does not disappear immediately, and the human eye can still maintain its image for about 0.1-0.4 seconds. This kind of residual vision is called "afterimage". The visual phenomenon is called "visual persistence", and the single product can be unique. Vertical display effect can also display the overall effect in combination.

3D holographic fan screen application: shopping malls, brand stores, stores, airports, etc. A good choice to reflect brand effect and brand grade

Principle of 3D holographic screen: Generally speaking, one or more strings of LED lights are arranged on the fan blades. Here, it is assumed that there are 20 LED lights, which are numbered 1-20 at a time from the axis to the edge of the fan blades. In order to explain the principle briefly, we assume that when the fan speed is 60 laps per minute (in reality, the speed is much higher), the human eye will have visual persistence. Let's assume that the LED light is 0 degrees above the fan in 0 seconds. If you want to display the effect of 6:00 on the fan, the minute hand needs to point to the top and the hour hand needs to point to the bottom. It is necessary to turn on the number 1-20 to display minute hand in 0 second, turn on the number 1-10 to display hour hand in 0.5 second, turn on the number 1-20 to display minute hand in 1 second, turn on the number 1-10 to display hour hand in 1.5 second, and so on, so that the human eye will receive a complete picture of the clock at 6:00. For complex patterns, LED fans will have more complex structure and programming equipment. Through the combination of LED light bar rotation and visual persistence, people will see a dynamic 3D picture of the rotating LED fan.

3D holographic fan screen structure: the screen body mainly has light bars and, according to different ones, some have two. Add rotary motor, built-in 3D holographic system and information receiving system.

At present, the main application of 3D smart screen is advertising. Because of its editability and realistic display effect, it is believed that in the near future, it will be applied in more fields.

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