Since the emergence of the term high-voltage LED , there is no doubt that it is a brand new LED variety, and has many advantages. Some people even think that it will make today's "low-voltage LED" will fade out of the future LED general lighting market and "high-voltage LED" will dominate the future of LED general lighting, is this really true? Let's take a look at what the so-called "high voltage LED" is all about.
1. What is a high voltage LED?
For high-voltage LEDs, I think everyone is no longer strange, so how do you understand high-voltage LEDs? In fact, it has already quietly penetrated into everyone's lamps. The light source with a VF value of 3.2V has been successfully applied to countless lamps. In fact, the practice of using multiple LEDs in series is the first one. The application of high-voltage LEDs; and the second, that is, LED upstream chip manufacturers through a special process to connect multiple LED chips with a VF value of about 3.2V in series on a substrate, leading to "+" and "-" Two PADs, also called high-voltage LED chips, are used by the packaging manufacturers to make high-voltage LED light sources. As shown in Figure 1 and Figure 2 below.
Second, the advantages and disadvantages of high voltage LED analysis
1. Let's first take a look at the advantages of this high-voltage LED.
(1) High luminous efficiency. It is made up of multi-core small chips connected in series, and the actual test light effect is 5-10% higher than the ordinary same wattage light source.
(2) Low power requirements. The high price and failure rate of power supply is the primary problem that has hindered the development of the industry in recent years. High-voltage LEDs have inherent advantages. It can achieve high efficiency and safety of LEDs with a small number of light sources and linear constant current drivers. Stable job.
(3) Linear power supply combines cost savings. Speaking of this, some people may say that the linear constant current power supply is inefficient. In fact, it depends on how you use it. In the past two years, there have been many linear constant current drive ICs on the market. The performance is not bad. I have tested it. A linear constant current IC called RY8201 has an efficiency of more than 0.9. Due to the small size of the linear constant current IC and the absolute advantage of the peripheral components, the power drive part can be directly fabricated on the PCB, thereby eliminating the space for installing the power supply box and installing the power supply (and also for the power supply). The link, which makes the cost control, warehousing, capacity, delivery and other costs superior.
(4) The superiority of the light source part. Since the traditional low VF light source is used after N series and then used, the welding labor cost is high, and the products with poor welding are endless, which affects the production capacity and brings a lot of secondary costs.
(5) Light decay. Since the conventional light source is made by N-string N, it is known that the VF inconsistent light sources are combined together, which causes the power source loaded on each light source to be different, thereby causing some of the light sources to age prematurely or die, thereby causing The light decay of the whole lamp is accelerated. The high-pressure lamp bead is a multi-string way to easily solve these problems.
2. We are looking at the shortcomings of this high-voltage LED.
(1) High cost. Due to the maturity of the technology of the upstream chip manufacturers and the large-scale mass production of the chips, the chip is still high, and the production equipment of the original packaging company cannot directly separate the high-voltage light source, which is also caused by This is a high factor, but through the maturity of technology, mass production and equipment improvements will soon break this pattern.
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