How to test the LED driver power supply
The quality of LED driving power supply directly affects the quality of LED lighting system, but in the LED lighting system is relatively easy to damage the driving power supply. In order to ensure the safety, efficiency and reliability of LED driving power supply, strict testing must be carried out in the development or production stage.
Compared with traditional energy-saving lamps, LED lamps have higher light efficiency and are more environmentally friendly. LED drive power supply is the AC power supply or other DC power supply into LED lamps available constant voltage or constant current specific power supply, LED drive power supply is one of the core components of LED lighting, its performance and reliability directly determines the use of LED lighting effect and life. So, what are the necessary tests for the LED drive power before it is put into use?
Introduction to LED Driver Power Test
LED drive power supply manufacturers in order to further improve the performance of the LED drive power supply, and ensure the excellent quality of products, product before delivery usually need to pass the strict test process, which includes the input, output, testing, protection testing, security testing, environmental testing and EMC testing, etc. A wide variety of test project.
1. energy efficiency
High efficiency LED is an energy saving product, and the efficiency of the driving power supply is high. Power efficiency is more important for lamps with internal power supply. Because the luminous efficiency of LED decreases with the increase of LED temperature, the heat dissipation of LED is very important. The efficiency of the driving power supply is high, its power loss is small, and the heat is small in the lamps and lanterns, which reduces the temperature rise of the lamps and lanterns.
2. power factor
Power factor is the load requirements of the grid. With the continuous improvement of the demand for power supply quality, the power quality and harmonics caused by electrical equipment are paid more and more attention. "LED module with AC electronic control device energy conservation certification technical specification" for the LED control device energy efficiency limit value has been stipulated, the line power factor is the lowest 0.7.
3. Output ripple
Ripple is the AC voltage applied to the DC output voltage and is also an important measurement parameter in LED power supply testing. The larger the ripple current is, the performance of LED will be affected, and even the service life of LED will be seriously reduced.
4. Input surge current
LED drive power supply should have the ability to suppress the inrush current to protect the LED from being damaged. The input surge current is generally at the cold start, when the AC voltage is at the peak (90° or 270°), the surge current maximum. Important components of LED power supply, such as input fuses, rectifiers, etc., are generally rated higher than the input surge current value.
5. Abnormal test of input power supply
The main purpose of the input power supply anomaly simulation of the LED driver is to assess whether the LED driver can meet the requirements of the voltage immunity test section of the EMC test, which can be referred to IEC 61000-4-11: Voltage Skips, Short Interruption and Voltage Variation immunity tests.