LED floodlights, also known as LED floodlights, spotlights, projection lamps, spotlights, etc., are mainly used for architectural decorative lighting, as well as commercial space lighting, decorative components are heavier, and their appearance is round. It is also square, because it has to consider the different reasons of heat dissipation and application environment, so other shape floodlights only have some differences in appearance, in fact, the principle is the same.
When you want to know how the LED floodlights are broken, you must first understand the most basic structure of the floodlights. Because of the different reasons for heat dissipation and application environment, other shape floodlights are just shapes. There are some differences, but the principles are the same. LED floodlights are mainly LED light sources (also known as LED lamp beads), LED power supplies (also known as LED drivers), housings, waterproof gaskets and waterproofing glue. LED light source, the driving quality is excellent, the waterproofing is good, the outer casing is thick enough to meet the heat dissipation of the light source and the power source, and the floodlight is basically not problematic. Then, if the LED floodlights are broken, there will be no bright spots, a flash, sometimes bright, and what should be done? I will tell you how to repair and replace it today.
The LED flood light is broken, mainly the light source and the drive. The most important source is the light source and the power supply are not good enough to cause problems. If you use the tool to check it, you know that the LED lamp is not lit. The reason is:
1. The power supply is broken, no power: the lamp is basically the power supply, and the power supply provides constant current to the light source. The working voltage, often a lot of floodlights are bad on the power supply. The power supply has problems in converting AC power into DC power, which may cause the LED flood light to not shine brightly. This kind of general can’t be repaired, only the power supply is changed. Another reason is that the power supply is good, and the performance is just The spotlight can be turned on for a while and then start to flash. This is mainly because the heat of the lamp beolating does not go out, causing it to flash all the time. The fundamental problem is that the casing does not disperse the lamp bead. First, check if the casing reaches 50g/w. Standard, additionally check whether the light source and the outer casing are well connected, and whether the thermal paste is evenly coated. If the power supply is broken, try another power supply and see if the light is still off. If it is not lit, then the problem is not necessarily at the power source. Another reason is that the temperature difference between winter and summer in some areas varies greatly, resulting in the power supply operating temperature being too high or too low to operate stably. Objectively speaking, this power supply is a non-conforming product. If the power supply is broken, then change a good point, a power supply can not be two or three years, the quality will not work.
2. The light source is broken, no light is on: the general spotlight is integrated with the lamp bead, see if there is a black spot in the middle lamp bead seal position, this black spot is two reasons Caused by the first long-term use, the temperature of the lamp is formed by the high temperature of the glue and the phosphor. Another reason is that the current of the power supply is too high, and the lamp itself is open or necrotic. In addition, there is no waterproofing of the floodlights. The water inside the lamp is flooded, causing the lamp beads to burn off, the chip life is not long, and the quality is not good. The poor heat dissipation of the floodlight source will also cause the light source to decay (in simple terms, it is not bright before) or it will burn out. If the outer casing is intact, it is still possible to replace the lamp bead, but you need to know the string of the power supply and match the source string.
3. Wire solder joints are weakly soldered, resulting in no power supply: the integrated lamp bead inside the floodlight is connected to two wires, whether the lamp beads have virtual soldering, false soldering, cold soldering, and whether the power input line is If there is a loose connection point, an open circuit, etc., check if the drive cable is broken. In short, the LED floodlights are not bright. The main reasons for flashing are voltage instability, lamp quality, and power quality. Since the LED floodlights are driven by constant current, the DC voltage after conversion is relatively low. Therefore, the problem of voltage instability can be neglected, and the reason why the LED floodlight does not shine brightly is in the quality of the lamp bead and the quality of the power supply.
In the end, LED floodlights are all high-power LED products. Good quality manufacturers will undergo strict aging test before leaving the factory to ensure that they are good products in the hands of consumers, electronic products. No manufacturer can guarantee 100% no problem, in case of problems, please contact the factory after sale, the warranty of the spotlight is at least 2 years, if you buy a cheap spotlight for half a year, 1 year out The problem, the manufacturers will basically ignore you, because the cheap spotlights use poor materials, cost compression, coupled with high after-sales costs, manufacturers will lose money, so no matter what electronic products, after-sales service is very Important, remember!
The floodlight is broken, can you repair it yourself?
LED floodlights can be repaired, but non-professionals can not repair, it is recommended to find a professional manufacturer of LED lights to help repair. Of course, the average company is not willing to repair, because repairing a light fixture is more trouble than producing a light fixture! It is recommended to buy lamps with a slightly better quality when buying lights, of course, good quality will be more expensive! A good luminaire manufacturer will have a warranty of 2-3 years.
LED floodlight dimming technology and future development
1. Main LED light dimming technology
The first method is through adjustment The driving current of the LED is used to achieve dimming of the LED lamp because the brightness of the LED chip and the LED driving current have a fixed ratio.
The second dimming is commonly referred to as analog dimming mode or linear dimming. The advantage of this dimming is that when the driving current is linearly increased or decreased, the LED chip will be relatively lowered, and the immunity of the control circuit is strong against the overshoot of the driving current. The disadvantage is that the change in drive current will have a certain effect on the color temperature of the LED chip.
The third mode of dimming is the pulsed light modulator (PWM) mode. This method is achieved by a certain control to make the driving current square, the variable pulse width, the duration of the change by the pulse width adjustment, and also the output power can be changed, thereby achieving the purpose of energy saving. Frequency control is generally 2From 00 Hz to 10 kHz, since the human eye is visually retained, it is not possible to feel the movement of light that flickers. The advantage of this method is that the advantage of moving light is that it can improve the heat dissipation of the LED. The disadvantage is that the overshoot of the drive current has a certain effect on the life of the LED chip.
The above three dimmer methods are classified according to the output control of the LED drive current. The control circuit can also be divided into analog control and PWM control, and the control circuit is usually completed by a microcontroller.
2. Dimming system and future development
The perfect intelligent control should have manual control, intelligent control, light control, time control and fault alarm function. When the sun goes down, the sky can be lighted automatically, and the illumination at 12 o’clock in the middle of the night can be automatically halved. After dawn, the light can be automatically extinguished; in special cases, people can control it manually; when the control fails, the control system can automatically Call the police.
The intelligent dimming system includes a server, the central controller, a single chip controller and a signal detection circuit.
Server: Host and computer software, mainly composed of monitoring and alarm functions. The connection of the website server to the streetlight management control center and the central controller can be achived by power line carrier, network or wireless.
Central controller: responsible for receiving signals from the server and sending them to the controller, control and signal detection, and sending the results to the decoding unit of the server.
Signal detection circuit detects ambient brightness, drives power supply voltage, and current. And the detected signal is sent to the unit controller or the central controller.
Unit controller: Each LED light is equipped with a unit controller. By receiving the command, the central controller controls the light or turns the LED on and off. At the same time, the LED is detected by the driving voltage and current signal. The central controller of the circuit. When there is an LED luminaire fault to the fault signal to the central controller.
At present in the field of road lighting, the application of LED is spreading rapidly, long life and reliability are still the first thing to consider, but as technology develops, life and reliability issues To be solved, to a certain extent, LED lighting applications will inevitably move toward the pace of intelligent dimming systems.
(provided by Shenyang Building Materials Network) <
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