Analysis of the causes of frequent problems in LED lighting drive power supply and countermeasures

Let's talk about some ways to solve the problem of high LED lamp failure.

Outdoor lighting, representative lighting is LED street lighting , LED lighting problems focus on high power failure rate and light attenuation. Aside from the quality problems of electronic components selected by various manufacturers, the main cause of high failure rate of LED street lamps is that the water is short-circuited and burned, not being thundered. The failure rate in a typical power supply installation luminaire is much lower than the failure rate on the back of the installed luminaire. Do not think that the power supply IP65 can be used outdoors, and IP68 can't guarantee that it will not enter the water vapor. Most of the lamps and power supplies enter the water mainly because of the high humidity of the air, the change of the temperature difference causes the breathing to enter the water, and the use of low-quality waterproof materials, the use of waterproof for a short duration and other reasons.

We can try some solutions to this situation:

1. Try to use it - look at what brand of power is used by the peers, what is the installation method, and what is the fault.

2, try to change the power supply installation method, although the power supply installed in the lamp housing will make the shape of the lamp larger and ugly, compared to the consequences of high failure rate seems to be more reliable.

3, try to change the power installation process, many power supplies are fixed with screws at both ends, because the screw torque is too large, resulting in stress deformation of the power supply shell, resulting in reduced waterproof capacity. Try to install the casing or hoop to make the power supply casing unstressed; or add rubber gaskets around the mounting angle to try according to your own product features.

4. Try to change the installation position of the power supply. It seems that no manufacturer has proposed to separate the power supply from the luminaire. Install the power supply in the inspection port of the lamp post like a traditional luminaire. This is an effective way to reduce maintenance costs without the guarantee of power quality. This and centralized DC power supply should be much better implemented. Centralized DC power supply, N+1 power module backup, democratic diversion, lengthy processing, and centralized DC power supply technology are the ultimate solution to solve the high power failure rate of LED lamps.

Searched on the Internet for a while, I don't know why, there is no manufacturer to use LED lighting power supply and street lights to separate the information installed in the lamp pole inspection port. We can calculate it.

Wire resistance calculation formula: R=ρ.L/S The copper resistivity is 0.0175Ω.mm2/m, the height is 12 meters, the majority of the rod is 2.5mm2 copper wire, and the length is calculated by 13 meters, R=ρ. L/S=0.0175*13 / 2.5=0.091Ω, a brand LED street light power supply nominal: output voltage DC48V, power: 200W, output current: 4.17A, calculated according to the rated current of the power supply,

The pressure drop U = R * I = 0.091 * 4.17 = 0.379V. This is the voltage drop when the power supply is fully loaded. If it is used by experience, to ensure the power supply life, the most commonly used power supply is 70% of the rated power, then the voltage drop is only 0.265V. I don't think the voltage drop of 0.265V will reduce the brightness of the light source. a lot of. For now the switching power supply technology, the use of a high output voltage 0.3V, or in series-parallel LED lamp circuit be adjusted, using the input voltage is less than 0.3V is very easy. If you chase the end, the height of the pole changes, the wire is not the copper wire is the aluminum wire, the wire drop will change, then the LED lamp bead part can be made into a constant current wide-spoke voltage supply. As for why there is no manufacturer to install the power supply in the inspection port, I hope that everyone can give the correct answer, and Xiaosheng is too shallow.

I think there may be several reasons:

1. Single-pole multi-lamp route problem, but I have seen that the threading inside the lamp post is basically at least two wires (L+N) of a lamp cap, and there is no case of touching the middle section.

2, the transformation project, but high-pressure sodium lamp and metal halide, the compensation part of the electrical part, ballast, insurance is also mostly placed in the lamp pole inspection port.

3. The power supply and the luminaire are divided into two parts. I am worried that the user only purchases the luminaire from the LED luminaire manufacturer. The power supply is purchased separately. I personally think that this is not a bad thing. It provides power technical requirements and is purchased by the user. Although it will earn less, lower its business. Amount, but also a lot of savings in the cost of procurement and capital flow, and the lack of a product that is not produced by itself but will affect its own quality components, each has its own views.