Common problems and analysis of LED lighting
According to feedback from relevant units, LED lighting systems often encounter some problems, which affect the normal use of the system. The common problems are listed as follows:
1. Multiple LED power supplies are started at the same time, causing the micro-circuit breaker of the lighting circuit to trip, which affects the normal use of lighting
This problem has been introduced in the past. The main reason is that the instantaneous start of the LED lamp has a large inrush current, and the multiplier of the inrush current is as high as tens of times, or even hundreds of times.
2. Interference with other lighting equipment and communication equipment
In a real case, the LED desk lamp on the writing desk of a hotel is plugged into the socket, and the following strange phenomenon occurs no matter whether the lamp is turned on or not:
The two wall lamps that illuminate the decorative paintings flicker periodically, and there is no switch to turn off the two lamps, which affects people's normal sleep;
The set-top box of the TV cannot be loaded, started, and cannot be used normally.
The two electricians in the hotel failed to solve this problem after a long inspection, and the problem was not small. The author accidentally found that the table lamp and the wall lamp change periodically and synchronously, unplug the table lamp socket, the problem is completely solved, the wall lamp and the set-top box return to normal, and the wall lamp can be turned off with a switch. After analysis, the desk lamp interferes with the surrounding equipment and affects the normal use of other equipment.
3. Three-phase current power supply, the neutral line temperature is too high
When the LED lamp is powered by three-phase current, the temperature of the neutral wire is too high. There may be two situations for this problem:
The harmonics are too large, especially the 3rd, 9th, and 15th harmonics are too large. Since the 3rd, 9th, and 15th harmonic currents on the three-phase are in the same direction, the current on the neutral line is three times the harmonic current. much larger than the phase line current;
The phases share the neutral line, and the neutral line is smaller than the cross section of the phase line, and the lamp is a single-phase power supply, and the single-phase unbalance during operation causes the neutral line to be overloaded and the temperature is too high.
4. The light goes out when the voltage is low
This problem is determined by the LED driver, some products have a wide input voltage range, and some are narrower.
In a word, LED is the necessity of lighting, and the problems encountered are problems in progress. It is necessary for the industry to strengthen cooperation and research, solve these problems in time, and let LED lighting develop healthily!
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