Why do led flood lights flicker

Why do led flood lights flicker? Led lamp strobe is generally too large power supply ripple, so that the LED light flashes, this flashing human eye can not see, you need to use the phone to take pictures can clearly see the flashing. LED light power PF value is low, no There will be stroboscopic (except for RC power supply). However, the power supply with low PF value is very polluting to the power grid. 

LED power supplies larger than 10W generally have requirements for PF. Due to cost reasons, most of the high PF power supplies will now have The strobe.PF value is: power factor, the power factor PF value of the incandescent lamp is 1, and the PF value of the switching power supply without PF correction is generally about 0.6. The power PF value of the PF correction circuit is 0.9 or more. The higher the PF value, The higher the utilization rate of the power grid, the more energy-efficient! The PF value refers to the utilization rate of the power grid (active power), which has nothing to do with the efficiency of the switching power supply!

There are four possibilities for causing the LED light source flicker:

1. LED lamp bead does not match LED driver power supply. Normal single foot 1W lamp bead withstand current: 280-300mA, voltage: 3.0-3.4V. If the lamp bead chip is not full power, it will cause the light source to strobe. When the current is too high, the lamp bead can’t be withstand and it will be turned on and off. In serious cases, the gold wire or copper wire built in the lamp bead will be blown, resulting in the lamp bead not shining.

2. It may be that the drive power supply is broken. Just replace it with another good drive power supply and it will not flash.

If the drive has over-temperature protection function, and the thermal performance of the material of the luminaire can not meet the requirements, the drive over-temperature protection will start to work. For example, the 20W floodlight housing is used to assemble 30W lamps, and the heat dissipation work. This will be the case if it is not done well.

3. If the outdoor led flood light also has a strobe light, the light is in the water. The consequence is that it will not light up when it flashes. The lamp bead and the drive are broken. If the drive is waterproof, if it is good, it will just break the lamp bead and replace the light source.

LED, the abbreviation of English light emitting diode, also known as LED.

Its basic structure is an electroluminescent semiconductor material, a solid-state semiconductor device that directly converts electricity into light.

It is placed on a leaded shelf and then sealed with epoxy resin to protect the inner core wire. Therefore, the LED has good seismic performance.

4. The heart of the LED is a semiconductor wafer. One end of the wafer is attached to a bracket, one end is a negative pole, and the other end is connected to the positive pole of the power source, so that the entire wafer is encapsulated by epoxy resin.

Causes of stroboscopic light: The strobe of the light source is essentially that the light emitted by the light source exhibits a certain frequency and periodic change with time, and changes with time between different brightness and color. If the driver of the luminaire does not have suitable electronic circuits, such as ballasts, drives or power supplies, the source will strobe, the greater the fluctuation of the output luminous flux, the more severe the strobe.

The technical mechanism of generating stroboscopic has both the factors of power supply, the performance factors of electric light source technology and the unreasonable factors of lighting design. For many lighting fixtures, the operating current of the light source must fluctuate with fluctuations in the input voltage, directly causing stroboscopic fluctuations in the light output.

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