LED drive power using electrolytic capacitors leads to shortened lamp life?

LED semiconductor lighting network energy has always been a global concern, and the global energy consumption of about 19 to 20% of the lighting energy consumption, if you can use LED light source, you can fully achieve the advantages of both power saving and long life. Therefore, the LED lighting market has mushroomed in recent years, and has rapidly replaced various traditional lighting sources in various applications such as home, industrial, commercial space lighting, street lamps, car lights, and plant factories, and has become the government of the world to promote energy conservation. The most important direction in the carbon reduction policy.

However, the use of electrolytic capacitors in LED driver power supplies has led to a problem of low lamp life. It is a topic of controversy and controversy. The LED driver power supply is generally divided into isolated and non-isolated. In the commercial application of assembled lamps, most customers choose to use isolated LED driver power for safety considerations, and the mass-produced LED driver power supply on the market also Almost all use electrolytic capacitors for design. Mingwei has always focused on the research and development and quality of switching power supply products. This time, we will further discuss the role of electrolytic capacitors in LED driver power supply and its life performance.

The role of electrolytic capacitors in LED drive power

Electrolytic capacitors in the application of isolated LED drive power, roughly distinguish between primary capacitance (Cp) and secondary capacitance (Cs), have energy storage and filtering. In addition to absorbing lightning energy and preventing flashing caused by power transients, Cp also has the effect of reducing EMI. Cs is mainly filtered on the output side, which can reduce the output low-frequency current ripple and improve the stroboscopic phenomenon. Currently, the low-power LED driver power supply commonly used in the market usually adopts a single-stage Flyback or PSR architecture without Cp in order to pass the regulatory requirements and low-cost requirements of harmonic current, and the circuit is omitted because the Cp is omitted on the circuit. The test needs to add additional countermeasure parts; and the output of high and low frequency ripple will not meet the requirements of low flicker (low frequency luminous flux change ratio below 8%).

LED lamp life factor

The key factors affecting the life of LED lamps are nothing more than the electrolytic capacitors used in the light source and the driving power source, both of which are directly related to temperature. The current commercial lamps indicate the life of the lamps, ranging from 15,000 hours to 50,000 hours. According to the LED manufacturer's data, the average life expectancy of high-power LEDs is estimated based on the test results of LM-80 or TM-21, which is about 5 Ten thousand hours, the picture shows Cree's LED life test and calculation example. The life of the LED driver depends on the grade and temperature of the electrolytic capacitor used in the design. It should not be lower than the life of the LED. It is a reasonable design choice.

Mingwei LED driver power supply life

The life verification of Mingwei LED driver power supply has always been based on the recommended test and calculation methods provided by internationally renowned electrolytic capacitor manufacturers. Taking the HLG-150H-24 model as an example, its design output capacitor is 10000 hours @105°C. The highest grade electrolytic capacitor, due to its efficiency of up to 93%, when tested at an ambient temperature of 60 ° C, the temperature rise of the electrolytic capacitor is low and will not exceed 80 ° C, after the actual measurement, the product life can be as high as 70,000 hours, if in the ring When used at a temperature of 50 ° C, the life expectancy will be doubled. Therefore, it is not a problem at all to design whether the LED driving power supply using electrolytic capacitors has an impact on the life of the luminaire. What is really important is that the luminaire needs to adopt high-efficiency circuit design and high design of parts in the purchase and matching of the power supply. The LED drive power of the quality electrolytic capacitor is the fundamental solution to push up the life of the lamp.