In recent years, LED as a new energy-saving light source has won high investment enthusiasm and great attention in the world and China, and penetrated from the outdoor to the indoor lighting application market. China has also emerged tens of thousands of LED lighting companies. The main reason for letting LED lighting shine is its energy-saving, environmentally friendly, long-life, easy-to-control, maintenance-free features.
However, it is ironic that we often hear that the LED lighting power supply itself directly drags down the LED lighting fixtures to become "longevity", which greatly increases the maintenance/use cost; or the efficiency of the driving power supply is not high, leading to LED lighting fixtures. The energy efficiency conversion ratio is not as high as imagined, or because the output current ripple is not well controlled, which affects the illumination quality, which makes the green energy-saving advantages of LED illumination greatly reduced, and even affects the market.
Therefore, the improvement and maturity of the LED industry chain, driving power is also an important part of it. However, the current situation is that LED driver power supply design and quality limitations have increasingly become the "back legs" of the LED industry development, so power module manufacturers, lighting manufacturers are increasingly paying attention to the use of advanced test and measurement technology and solutions. In response to this situation, Tektronix is ​​unique, deep into the customer, in-depth understanding of the actual needs of the site, and developed a variety of solutions for LED vertical applications, designed to help more Chinese LED lighting manufacturers, drive power suppliers and Relevant quality inspection/certification institutions obtain more accurate test results and ensure the quality of LED drive power, thus promoting the healthy and prosperous development of China's LED lighting industry.
Figure 1: Tektronix offers a variety of test solution combinations for LED lighting applications.
The reliability and energy efficiency of LED driver power is the key to testing
So, what characteristics should the true high-quality LED driver power supply have or should it meet? Tektronix summarizes the following main aspects:
1. High reliability and longevity: The life of the driving power supply should be compatible with the life of the LED, especially for the driving power source like LED street light. Because it is installed at high altitude, the maintenance is inconvenient and the maintenance cost is also large;
2. High efficiency: This is especially important for structures where the power supply is installed in an LED luminaire. Since the luminous efficiency of the LED decreases as the temperature of the LED increases, the heat dissipation of the LED is very important. The power source has high efficiency, its power consumption is small, and the heat generated in the lamp is small, which reduces the temperature rise of the lamp, and is beneficial to delaying the light decay of the LED.
3. High power factor: With the continuous improvement of the society's requirements for power quality, people are paying more and more attention to the power quality and harmonics caused by electrical equipment. If the European Union has issued standards, power supply devices with a power greater than 25W must have a power factor correction circuit. In many other countries, for 30~40W LED drive power, it is said that there will be certain indicators for power factor in the near future.
4. Constant current drive: There are two types of current traffic: one is a constant voltage source for multiple constant current sources, and each constant current source supplies power to each LED separately. This combination of flexible, one-way LED failure, does not affect the work of other LEDs, but the cost will be slightly higher. The other is direct constant current supply, with LEDs running in series or in parallel. Its advantage is that the cost is lower, but the flexibility is poor, and it is also necessary to solve the problem that one LED failure does not affect the operation of other LEDs.
5. Appropriate output ripple: Output ripple affects the LED's light output. But reducing ripple requires the use of higher quality and capacity capacitors. In order to improve the overall life of the power supply, designers tend to adopt a capacitorless solution. The engineer must determine the compromise on the output ripple indicator.
6. Surge protection: The ability of LED to resist surge is relatively poor, especially the ability to resist reverse voltage. Some LED lights are installed outdoors. Due to the start of the grid load and the detection of lightning strikes, various surges will be invaded from the grid system, and some surges will cause LED damage. Therefore, the LED driver power supply must have the ability to suppress the intrusion of surges and protect the LEDs from damage.
7. Protection function: In addition to the conventional protection function, it is better to increase the LED temperature negative feedback in the constant current output to prevent the LED temperature from being too high.
8. Protection: For the external installation structure of the lamp, the power supply structure should be waterproof and moisture-proof, and the outer casing should be light-resistant.
9. To comply with safety and electromagnetic compatibility requirements.
To achieve high-quality drive power design standards, a comprehensive test and measurement analysis is required. As shown in Figure 1, the LED lighting test consists of five parts: power quality, harmonics, power switching device measurement, modulation analysis, and drive output. Parametric test.
Figure 2: Key test items for LED lighting drive power.
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