Although the luminous efficiency of LED street lamps is higher than that of gas discharge lamps, the only way to save energy is to use LED dimming technology. Especially in urban road lighting projects, as there are few cars and people on the road in the middle of the night, if the high illuminance of road lighting is still maintained, not only there is no actual lighting value, but also electric energy is wasted. If the brightness of the LED street light is appropriately reduced in the middle of the night, thereby reducing the power and saving electric energy, it will not only meet the travel needs of people but also save energy. CHZ lighting is a professional LED street lamp manufacturer. LED street lamp dimming is mainly realized by dimmable LED driving power. At present, the LED street lights produced by CHZ mainly use the following dimmable LED drive power supplies: The first type: timing dimming. Save energy by setting the time for the controller to turn on and off in advance. The second type: 0-10VDC signal control dimming. That is, two signal control lines are drawn from the LED driving power supply. When a 0-10V voltage signal is input on the signal control line, the LED driving power supply changes the output voltage or current according to the signal voltage, thereby adjusting the brightness of the LED street light. The third type: DALI control dimming. DALI is currently the most advanced lighting control system in the world. It can control each lamp individually, realize linear control of brightness, color temperature, color, etc., control lamps in groups, set different scenarios, scheduled tasks, and energy consumption monitoring. , Monitoring the health status of lamps, etc. The lamps and lanterns compatible in the DALI system can be controlled by a computer or other mobile terminals. Today, when the energy crisis situation is increasingly severe and the environmental quality is not optimistic, it is the responsibility of every lighting project builder to vigorously advocate energy-saving and intelligent urban road lighting projects. CHZ is creative lighting, healthy life, in-depth explanation of the long-term concept of CHZ lighting, it is based on leading technology and leading quality, and based on people's health and social ecology, responsibility and long-term development goals.
Recently, the lighting renovation project of the Haiyan County Gymnasium in Jiaxing City, Zhejiang Province passed the acceptance inspection and was officially put into use, which was highly recognized and affirmed by customers. CHZ Lighting provides a complete intelligent lighting solution for the Haiyan County Gymnasium. All lighting indicators meet the acceptance standards, achieving healthy, comfortable and smart lighting effects. Project OverviewHaiyan County Gymnasium is located in Haiyan County, Jiaxing City, Zhejiang Province. It is a landmark architectural landscape of Haiyan County. It covers an area of 19,607 square meters, with a building area of 12,320 square meters. The inner field is 48 meters long and 32 meters wide. It has a total of 2021 auditoriums. The project site can be used for basketball, volleyball, badminton and other sports competitions and training. It is the multi-functional gymnasium with the largest specifications and the most complete equipment in Haiyan County. It provides the best sports venue for the county to organize and host various events and activities.In order to improve the lighting system of the gymnasium, meet the growing demand for competitive performances and fitness services, and give full play to its role as an important county-level sports platform, the Haiyan County Gymnasium has vigorously launched a lighting upgrade project. With years of professional accumulation and technological precipitation, CHZ Lighting successfully won the bid and successfully completed the lighting upgrade and transformation of the Haiyan County Gymnasium, providing it with professional and intelligent lighting system solutions.CHZ lighting professional lighting solutionsBefore the renovation, the Haiyan County Gymnasium used traditional metal halide lamps with gypsophila. The lamps had low luminous efficiency, insufficient illumination, dark and uneven lighting in the venue, serious glare and stroboscopic light, which easily harmed human eye health. At the same time, the control method is single and consumes a lot of energy, which does not meet the national requirements for energy conservation, environmental protection, and emission reduction. The client requested to improve the lighting quality of the stadium, while taking into account the goals of saving energy and operating costs, and to achieve intelligent lighting according to the needs of the stadium.In this renovation, the customer chose the FL21 stadium light series of CHZ Lighting, which includes 48 sets of 300W and 20 sets of 150W. They are arranged on both sides of the stadium and equipped with intelligent dimming system and control panel. It can switch lighting modes such as emergency, entertainment, amateur competition, professional competition, etc. with one key to meet the application needs of different scenarios, easily realize intelligent management and control, and endow the venues with smart, energy-saving, ecological and environmentally friendly green building attributes. This series of stadium lights are made of high-quality aviation aluminum die-casting, with solid structure and good heat dissipation performance; the angle of the bracket can be rotated from 0 to 180°; at the same time, the two modules can also be rotated independently to achieve a wider range of illuminance , Compared with other lamps, the illuminance will appear more uniform. In addition, LUMILEDS3030 high-efficiency lamp beads and PHILIPS high-performance dimming driver are used to facilitate smart dimming. Finally, there are a variety of lens angles to choose from, such as 50°/ 60°/ 90°/ TYPE II_S/ TYPE III_M / TYPE IV_S/ TYPE V. For this project, in accordance with the characteristics and requirements of the venue, our designers used 4 angles to achieve the best lighting effect. CHZ smart lighting control panelAfter the renovation is completed, the third-party agency commissioned by the owner shows that the average illuminance of the venue reaches 1006Lx, and the uniformity of illuminance reaches U1=0.6, U2=0.78. The lighting design of the entire venue meets the industry standard professional competition (Ⅲ) level requirements. CHZ Lighting's high-quality lighting fixtures and precise lighting design make the stadium lighting brighter and more comfortable, effectively solving the problems of stroboscopic, glare and uneven illumination, creating a better lighting environment, and bringing users the ultimate healthy vision enjoy.CHZ Lighting has always been adhering to the promise of high-quality innovation, deepening in the field of sports lighting, and providing precise lighting solutions for many stadiums, demonstrating the strong technical strength of CHZ Lighting. In the future, CHZ Lighting will uphold its original aspiration, continue to temper, continue to participate in the construction of more stadium lighting, use high-quality lights to lighten the passion of sports events, and make more contributions to the development of China's sports industry.Lighting effect after renovation:
As a key component of LED street lamps, the quality of LED drivers directly affects the reliability and stability of the overall lamps. If the LED street lamp driver is damaged, it will lead to low efficiency of the lamp and even unstable operation. So what can cause damage to the LED street lamp driver? We roughly have the following analysis:1. Aging of electronic componentsIncluding resistors, capacitors, diodes, transistors, LEDs, connectors, ICs and other devices such as open circuit, short circuit, burnout, leakage, functional failure, unqualified electrical parameters, unstable failure and other failure problems.2. PCB quality issuesIncluding PCB, PCBA, poor wetting, cracking, delamination, CAF, open circuit, short circuit and other failure problems.3. Poor heat dissipation of the LED power supplyThe driving circuit is composed of electronic components, and a few components are very sensitive to temperature. Such as electrolytic capacitors, the prevailing formula for estimating the life of electrolytic capacitors is "every 10 degrees lower in temperature, the life will double". Poor heat dissipation may greatly shorten its life and premature failure, leading to LED voltage failure and lamp failure. Especially for the built-in power supply (the power supply placed in the whole lamp), a power supply with a large amount of heat will increase the heat conduction and heat dissipation pressure of the whole lamp, the temperature of the LED will increase, and its light efficiency and lifespan will be greatly reduced. Therefore, when designing the LED power supply, it should pay attention to its own heat dissipation problem. Therefore, the above problems can be solved by carrying out the evaluation at the beginning of the design of the lamp and the design of the power supply simultaneously. In the design, it is necessary to comprehensively consider the heat dissipation of the LED and the power supply, and control the heating of the lamp as a whole, so that a better lamp can be designed.4. Problems in power supply design(1) Power design. Although the LED has high luminous efficiency, there is still 80%-85% heat loss, resulting in a temperature rise of 20-30K inside the lamp. If the room temperature is 25℃, the inside of the lamp will be 45-55℃. The power supply is in a high temperature environment for a long time. In order to ensure the service life, the power margin must be increased. Generally, a margin of 1.5 to 2 times is retained.(2) Component selection. When the internal temperature of the lamp is 45～55℃, the internal temperature rise of the power supply is about 20℃, and the temperature of the component accessories should reach 65～75℃. Some components will drift at high temperatures and even shorten their lifespan. Therefore, the components should be selected for long-term use at higher temperatures, and special attention should be paid to electrolytic capacitors and wires.(3) Electrical performance design. The switching power supply is designed for LED parameters, mainly constant current parameters. The size of the current determines the brightness of the LED. If the batch current error is large, the brightness of the entire batch of lights will be uneven. Moreover, temperature changes can also cause the power supply output current to shift. Generally, the batch error is controlled within ±5% to ensure that the brightness of the lamp is consistent, and the forward voltage drop of the LED is biased. The constant current voltage range of the power supply design should include the voltage range of the LED. When multiple LEDs are used in series, the minimum voltage drop multiplied by the number of series connection is the lower limit voltage, and the maximum voltage drop multiplied by the number of series connection is the upper limit voltage. The constant current voltage range of the power supply is slightly wider than this range. Generally, the upper and lower limits are set to 1~ 2V headroom.(4) PCB layout design. The size of the LED lamps reserved for the power supply is small (unless the power supply is external), so the PCB design requirements are higher, and there are more factors to be considered. The safety distance must be sufficient, and the power supply that requires input and output isolation, the primary circuit and the secondary circuit require a withstand voltage of 1500 ~ 2500 VAC, and a distance of at least 3 mm must be left on the PCB. If it is a lamp with a metal shell, the layout of the entire power supply should also consider the safe distance between the high-voltage part and the shell. If there is no space to ensure a safe distance, other measures must be used to ensure insulation, such as punching holes in the PCB, adding insulating paper, and potting insulating glue. In addition, the layout of the board should also consider the heat balance, and the heating elements should be evenly distributed and cannot be placed in a concentrated manner to avoid local temperature rise. Keep the electrolytic capacitor away from the heat source to slow down the aging and prolong the service life.5. Lightning damageLightning strikes are a common natural phenomenon, especially in the rainy season. The damage and loss it brings is calculated in hundreds of billions of dollars every year worldwide. Lightning strikes are divided into direct lightning strikes and indirect lightning strikes. Indirect lightning mainly includes conductive lightning and induced lightning. Since the energy impact brought by direct lightning is very large and its destructive power is extremely strong, the general power supply cannot withstand it, so the main discussion here is the indirect lightning type.The surge impact formed by lightning strikes is a kind of transient wave, which belongs to transient interference, which can be a surge voltage or a surge current. Along power lines or other paths (conducted lightning) or through electromagnetic fields (inductive lightning) and transmitted to the power line. Its waveform is characterized by a rapid rise first and then a slow fall. This phenomenon will have a fatal impact on the power supply. The instant surge impact it produces far exceeds the electrical stress of ordinary electronic devices, and the direct result is the damage of the electronic components.6. The grid voltage exceeds the power loadWhen the grid branch wiring of the same transformer is too long and there are large-scale power equipment in the branch, when the large-scale equipment starts and stops, the grid voltage will fluctuate sharply, and even cause the grid to be unstable. When the instantaneous voltage of the grid exceeds 310 VAC, the drive may be damaged (even if there is a lightning protection device, it is invalid, because the lightning protection device is to deal with pulse spikes of tens of microseconds, and the grid fluctuation may reach tens of milliseconds, or even hundreds of milliseconds) . Therefore, special attention should be paid when there are large electrical machinery on the street lighting branch power grid. It is best to monitor the fluctuation range of the power grid or use a separate grid transformer to supply power.7. Solder joint failurePower packaging mainly involves the connection process between the PCB board and the components, in which solder joints play an important role. The main function of solder joints is to realize the mechanical and electrical connection between electronic components and the substrate (PCB board in the LED power supply). The quality of solder joints seriously affects the reliability of the device. On the one hand, solder joint failure comes from soldering faults in production and assembly, such as solder bridging, virtual soldering, voids, and Manhattan phenomenon. On the other hand, during the service process, when the ambient temperature changes, due to the difference in thermal expansion coefficient between the components and the PCB board, thermal stress is generated in the solder joints. Periodic changes in the stress will cause fatigue damage to the solder joints and ultimately lead to fatigue. Invalidate.Since the driving power supply has such a great impact on LED street lights, how to solve the problem of easy damage of the LED driving power supply?In order to solve the problems of high failure rate and difficult maintenance of LED driving power supply, through the analysis of LED lighting principle and power demand, combined with the current actual application situation, we try to adopt low-voltage DC power supply mode in LED road lighting. DC power supply not only reduces the failure rate of LED drive power, but also reduces the safety risks of road lighting, and provides convenience for future electric vehicle charging.With the continuous development of light-emitting diode (LED) technology, LED lighting has gradually expanded from indoor to outdoor. The reason for the slow promotion of LED in the field of road lighting is the high power of road lighting and the harsh operating environment. After a period of tracking and testing of high-power LED street lamps, some LED lamps have failed one after another. Through the analysis of the failure, we found that the LED drive power supply damage accounted for as high as 90%. Although the theoretical service life of LED street lamps is as long as 50,000 hours (13.7 years), the service life of its driving circuit is relatively short, about 12,000 hours (3 years). Drive power has become a shortcoming restricting the service life of LED street lights. At the same time, due to the lack of uniform standards for LED drive power supplies that match the LED particles, the drive power output interfaces produced by various suppliers are not uniform, and the quality is uneven, which brings inconvenience to the maintenance of LED street lights, and the cost of replacing the drive power supply is high.The power supply problem has become an important factor affecting the promotion and application of LED lamps. Only by solving the problem of LED power supply can the application of LED lamps in road lighting be opened.1. The requirements of LED particles for power supplyIn order to solve the problem of LED power supply, we need to understand the basic working principle of LED particles and their power supply requirements.The LED lamps currently used in road lighting have an overall light-emitting structure, including two parts: an LED light source and a power source. The LED light source is a combination of a certain number of high-power LED particles (first in series and then in parallel) into a whole light-emitting chip. A single LED is actually a diode. When a certain forward voltage is applied across the diode to excite the P-N junction to conduct current, the LED can emit light. The nominal voltage of a single LED is 3.4V±0.2V (the actual working voltage is about 2.8~3.8V). Working current is related to power and brightness, and LEDs of different powers have different currents. Generally speaking, the higher the power, the higher the current, the more light will be emitted. The high-power 1W LED particles used in road lighting have a nominal current of 350mA.Through the structural analysis of the actual LED lamps, we can clearly see that a certain number of LED particles are connected in series to obtain an LED string with a working voltage of 40.8V±2.4V, and then these LED strings are connected in parallel to obtain one LED lamps with a working current of 3.5A. Calculating the loss, the lamp’s power requirement is 48V/3.5A.2. LED drive powerThe existing street lamp power supply line is 220V alternating current, and three steps of voltage reduction, rectification, and current stabilization must be carried out to provide a stable low-voltage DC power supply for LED lamps. First, the 220V AC power is stepped down into 48V low-voltage AC power, and then the low-voltage AC power is converted into low-voltage DC power by bridge rectification, and then converted into a constant current source by a high-efficiency switching regulator to provide constant current for the LED particles. Current.In order to reduce the chip failure rate, most manufacturers choose the combination of fewer strings and more parallel. The voltage requirements of existing LED lamps are mostly 48V. Each LED lamp may have slightly different power supply voltage and current requirements. In actual applications, it should be based on the overall Choose a suitable driving power for the voltage and curren
Generally speaking, when solar street lights leave the factory, the working hours are set according to customer requirements, but some customers will still ask whether the lighting time can be adjusted after installing solar street lights for a period of time. Customers want to extend or shorten the lighting time of solar street lights due to seasonal changes, which is very reasonable and achievable.The start and close time of the solar street light is determined by the street light controller. How to adjust the lighting time of led solar street lights also depends on the type of controller used. There are 2 basic ways to control the time of the solar street light controller:1. PIR controlThis kind of controller does not need to adjust the time, it will automatically sense the intensity of the light to control the light on and off. After installation, there is no need to adjust the light on and off time according to the season. It will automatically turn off during the day and turn on at night. This kind of light control is now widely used in lithium-ion solar street lights, and the cost is also low compared to several other control methods.Some customers will ask if the street lights will turn on automatically if it is cloudy. This needs to look at the cloudy effect. Under the common cloudy effect, it will not light up. It will only light up under extreme conditions. Of course, this kind of cloudy situation also needs to light up, and solar street lights are stronger than commercial LED street lights. The advantage is that it can also be illuminated in extreme weather, because the voltage is 12v for safe use of electricity, and it is not afraid of leakage.2. Time controlTime control is also one of the commonly used time control methods for solar street lights. It is to set the time in advance to turn on or off at a certain time. It is a bit more troublesome than light control. It needs to adjust the on and off time according to the season to avoid street lights. The situation that turns on and off in time. Now the more advanced time control controller can modify the time remotely.The special controller adjustment of solar road light is divided into manual adjustment and remote control adjustment. The external adjustment buttons can be adjusted manually. At present, most of the adjustments on the market are remote control. If this type of controller wants to adjust the working time, it must be equipped with a remote control.Solar street lights are now divided into split solar street lights and solar integrated lights. The split solar street light controller is generally placed in the light pole. Open the light pole protection cover to see the controller. The adjustment operation can be done by pressing the setting switch. It is not difficult. If there is no manual, try not to adjust it, so as not to damage the controller and cause the street light to not light up. The solar integrated light controllers are all in the lamp holder. If you want to adjust, you need to climb the pole or turn the pole down, turn on the lamp holder to adjust, you need to use a special tool to turn on the lamp, so if there is no remote remote control for the solar integrated lamp It cannot be adjusted. If necessary, please be sure to purchase a solar street light remote control for adjustment.