The LED industry is so hot that the penetration rate has been higher, but the quality of
LED power supplies can be described as uneven. Even though engineers are in this industry, if you want to go to the market to buy one or a batch of LED lighting, you will not be able to do it. In the gorgeous appearance of the long LED lighting, you can’t see what is used. The plan, at the time of the manufacturer's advertising campaign, will be skeptical. . . . The relevant regulations for LED power supply are still not perfect. The solutions of the cottage are endless. Perhaps in the eyes of many people, the chip of the cottage is hateful. But to elaborate, from the LED lighting market, if there is no cottage chip, the popularity of LED is not It will be so fast, from the perspective of LED power technology, the solution of the cottage chip is enough to make the LED work stably. The LED needs only a constant current control, and there is no difficulty in the control technology itself. Of course, the solution of the cottage chip also impacts the entire LED industry. So, is the cottage chip the culprit that causes the LED industry to be so chaotic?
I have also purchased a batch of LED lamps, different brands and different manufacturers. I once thought that as long as it is a big-name LED lamp, the product with relatively high price should be good. Let me talk about a foreign brand that everyone is familiar with.
Philips <br> Engineers who believe in this post are familiar.
Everyone knows that LED energy saving, after a month of use, proves that the legend is true. . .
It was used for just one month at home and it was broken. . . . No power consumption, enough energy saving. . .
Let's take a look at the picture below to see what it is:
After I opened it, my friends and I were shocked. . . .
Resistor-capacitor step-down, from the circuit principle, the reliability of the resistor-capacitor step-down power supply is relatively high, because the components are generally not easily damaged, but why is this broken?
No hurry, let's take a look at the light board, using a VF=12V
SMD LED lamp bead.
Look at the lamp bead in the upper right corner. A macro look, this lamp is broken, causing the light to not light up. In this way, it is true that the life of this LED power supply is very long, and the nominal 1 million hours can not be overestimated, but can the LED withstand the 50HZ ripple of the mains?
Toshiba
However, the following luminaire design is enough for cattle, which shows that the current LED driver is getting more and more abnormal, it is out of date, or the technology is too developed.
Two days to see the LED drive section, on an aluminum plate and drive LED lamp. Say the driver, exchange a varistor with a rectifier bridge
Two ICs (IC does not know what to do) No resistance and no capacitance directly drive the LED lamp beads out 30W.
Show everyone an internal picture of the Toshiba 24W
LED downlight . This lamp is priced at more than 800.
Next, a big-name product, NVC, which is also very "fearful" in China, believes that the lighting industry is no stranger to it. Let’s take a look at their advertising:
It looks good. . . Directly removed. . . .
This. . . . . It is also the resistance of the !!!??? For this reason, I also called the original NVC, and found that the official free service call of NVC is empty. . . . Finally, I directly dialed the original Huizhou phone. After N transfers, I transferred to the NVC Chongqing original counterfeit office. After the phone and mail, the reply was “unsure.†Instead, I also dismantled several domestic names that I could not afford. Brand LED lamps, although most of them use domestic cottage chips, but there are also domestic well-known brands of chips and there are also foreign TI and PI brand chips. . . . As the saying goes, "A mouse is awkward and a pot of porridge is broken." In this way, this "mouse cockroach" is not a cottage enterprise that people imagine, and a big-name enterprise that people have always trusted. I don't know if engineers in the LED industry will feel the same. . . .
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