As a more environmentally intelligent lighting method, LED lighting plays an important role in the "smart home". Not only that, but in the field of commercial lighting, the popularity of LED lighting is also accelerating. Mr. Lance Zheng, Director of Technology Marketing at Marvell GreenTechnologyProduct, shared his views on the trends and innovations of the LED lighting market in the coming years.
Lance put forward three predictions on the development trend of LED indoor lighting market: First, thanks to the continuous decline in the price of LED lamps, LED lighting will enter an explosive growth stage in 2014-2015. Second, the entire market will shift from non-dimming to dimming. Finally, a wireless dimmable LED light appears.
Lance pointed out that the difference between the cost of non-dimming bulbs and dimming bulbs is getting smaller and smaller, the main cost difference is driven. As for the development trend of LED commercial lighting market, Lance pointed out: First, industrial popularization is accelerating; Second, digital dimming based on DALI (Digital Addressable Dimming Interface) standard has also begun to popularize in commercial lighting.
Innovation 1: Digital-to-analog hybrid architecture makes it easy to achieve the best dimming in the industry
Digital-analog hybrid architecture is one of Marvell's important innovations in LED driver technology. The so-called hybrid architecture has a DSP core inside each chip and can run algorithms. In addition to the DSP core, there is an OTP inside the chip, and the memory is programmable. The program does not require the user to write it himself, but instead has a development tool in which all algorithms are solidified. With this OTP, the dimming curve of the driver chip can be adjusted. Another key point is that unlike the algorithm used to run the microcontroller, this does not require development software.
Take Marvell's single-stage LED driver IC88EM8183, which was introduced last year. It uses Marvell's unique mixed-signal architecture and advanced dimming control technology. It has dozens of patented algorithms and architectures. 88EM8183 can be programmed by OTP and changed. The peripheral resistor is adjusted for the dimming curve. Deep dimming down to 1% LED current can be achieved smoothly, compared to similar LED driver solutions that typically only achieve 10% to 20% dimming. With this amplitude dimming, the human eye does not feel a great change in light intensity, so the 88EM8183 significantly improves performance. It is the industry's best dimming and cost-effective solution with up to 90% dimming efficiency, high power factor (up to 0.99) and low total harmonic distortion (less than 15%).
The 88EM8183 is also compatible with most (TRIAC) wall dimmers, whether it is a front-cut, a rear-cut dimmer, or a digital dimmer. Its dimmer compatibility can reach 90%, while competitors do well near 70% to 80%, generally below 60%.
In particular, the 88EM8183 is also capable of providing a wide range of output power platforms and providing a unified platform for customer dimming and non-dimming, high voltage and low voltage. Commercial downlights based on 88EM8183 have also been introduced to the market.
The figure below shows another example of a Marvell digital-analog hybrid architecture application. This is a dual-string smart LED driver solution based on the Marvell88EM8801. With this solution, color temperature adjustment, high color rendering index, and high energy efficiency can be achieved, which can provide optimal illumination quality close to incandescent lamps.
Innovation 2: Buck-boost non-isolation solution with smaller size, lower BOM cost and higher efficiency
As mentioned earlier, in order to help OEMs and ODMs adapt to LEDs of various sizes, such as A19, PAR, BR, E17, GU10 and Candle, without compromising dimming performance, LED driver board area is required to be as small as possible. . By using Marvell's new mixed-signal architecture and signal processing technology, and integrating as many analog components as possible into the LED driver chip, the 88EM8183 can reduce the number of components required for LED driver power by more than half, greatly reducing the number of components. The required power supply volume.
In particular, in addition to the Fly-back topology, the 88EM8183 can also support the Buck-boost topology, a non-isolated drive solution that can drive drive sizes smaller than the Fly-back topology and cost more BOM. It's much lower, and the drive efficiency is much higher.
"We recommend customers to use non-isolated solutions for high voltage, low current LED loads so that drive efficiency is maximized." Lance emphasizes that "88EM8183 non-isolated solutions can be used directly in very small standard bulbs such as GU10, Candle and EE17. Supporting these small-sized bulbs is an extended application that is superior to other solutions on the market. "As we all know, GU10 and Candle are the most mainstream LED bulbs currently shipping, and the major OEMs and ODMs are still unable to find them. The toughest product of the right solution.
Marvell currently offers a complete board reference design for the 88EM8183 non-isolated drive solution that supports a wide range of output range applications and is easy to import into production, helping customers achieve very low PPM (as shown in Figure 3 below).
Lance put forward three predictions on the development trend of LED indoor lighting market: First, thanks to the continuous decline in the price of LED lamps, LED lighting will enter an explosive growth stage in 2014-2015. Second, the entire market will shift from non-dimming to dimming. Finally, a wireless dimmable LED light appears.
Lance pointed out that the difference between the cost of non-dimming bulbs and dimming bulbs is getting smaller and smaller, the main cost difference is driven. As for the development trend of LED commercial lighting market, Lance pointed out: First, industrial popularization is accelerating; Second, digital dimming based on DALI (Digital Addressable Dimming Interface) standard has also begun to popularize in commercial lighting.
Innovation 1: Digital-to-analog hybrid architecture makes it easy to achieve the best dimming in the industry
Digital-analog hybrid architecture is one of Marvell's important innovations in LED driver technology. The so-called hybrid architecture has a DSP core inside each chip and can run algorithms. In addition to the DSP core, there is an OTP inside the chip, and the memory is programmable. The program does not require the user to write it himself, but instead has a development tool in which all algorithms are solidified. With this OTP, the dimming curve of the driver chip can be adjusted. Another key point is that unlike the algorithm used to run the microcontroller, this does not require development software.
Take Marvell's single-stage LED driver IC88EM8183, which was introduced last year. It uses Marvell's unique mixed-signal architecture and advanced dimming control technology. It has dozens of patented algorithms and architectures. 88EM8183 can be programmed by OTP and changed. The peripheral resistor is adjusted for the dimming curve. Deep dimming down to 1% LED current can be achieved smoothly, compared to similar LED driver solutions that typically only achieve 10% to 20% dimming. With this amplitude dimming, the human eye does not feel a great change in light intensity, so the 88EM8183 significantly improves performance. It is the industry's best dimming and cost-effective solution with up to 90% dimming efficiency, high power factor (up to 0.99) and low total harmonic distortion (less than 15%).
The 88EM8183 is also compatible with most (TRIAC) wall dimmers, whether it is a front-cut, a rear-cut dimmer, or a digital dimmer. Its dimmer compatibility can reach 90%, while competitors do well near 70% to 80%, generally below 60%.
In particular, the 88EM8183 is also capable of providing a wide range of output power platforms and providing a unified platform for customer dimming and non-dimming, high voltage and low voltage. Commercial downlights based on 88EM8183 have also been introduced to the market.
The figure below shows another example of a Marvell digital-analog hybrid architecture application. This is a dual-string smart LED driver solution based on the Marvell88EM8801. With this solution, color temperature adjustment, high color rendering index, and high energy efficiency can be achieved, which can provide optimal illumination quality close to incandescent lamps.
Figure. Block diagram of a dual-string smart LED solution based on Marvell digital-analog hybrid architecture dual-channel LED driver
Innovation 2: Buck-boost non-isolation solution with smaller size, lower BOM cost and higher efficiency
As mentioned earlier, in order to help OEMs and ODMs adapt to LEDs of various sizes, such as A19, PAR, BR, E17, GU10 and Candle, without compromising dimming performance, LED driver board area is required to be as small as possible. . By using Marvell's new mixed-signal architecture and signal processing technology, and integrating as many analog components as possible into the LED driver chip, the 88EM8183 can reduce the number of components required for LED driver power by more than half, greatly reducing the number of components. The required power supply volume.
In particular, in addition to the Fly-back topology, the 88EM8183 can also support the Buck-boost topology, a non-isolated drive solution that can drive drive sizes smaller than the Fly-back topology and cost more BOM. It's much lower, and the drive efficiency is much higher.
"We recommend customers to use non-isolated solutions for high voltage, low current LED loads so that drive efficiency is maximized." Lance emphasizes that "88EM8183 non-isolated solutions can be used directly in very small standard bulbs such as GU10, Candle and EE17. Supporting these small-sized bulbs is an extended application that is superior to other solutions on the market. "As we all know, GU10 and Candle are the most mainstream LED bulbs currently shipping, and the major OEMs and ODMs are still unable to find them. The toughest product of the right solution.
Marvell currently offers a complete board reference design for the 88EM8183 non-isolated drive solution that supports a wide range of output range applications and is easy to import into production, helping customers achieve very low PPM (as shown in Figure 3 below).
Fig. Marvell offers a complete board reference design based on the 88EM8183 non-isolated drive solution
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