As the world begins to phase out inefficient incandescent lamps, a large incandescent lamp replacement market will follow, especially in the European and American home markets, as many incandescent lamps are dimming with TRIAC dimmers. Although CFL energy-saving lamps are the first to eat this cake because of the low price difference with incandescent lamps, it is widely believed that LED bulbs with dimming capability are the ultimate replacement. Since many European and American households have TRIAC dimmers installed, LED bulbs must support TRIAC dimming in order to successfully replace existing incandescent lamps, which is one of the main reasons why LED lighting solutions that support TRIAC dimming have been very popular recently.
However, Guo Qingquan, director of O2Micro's FAE and director of product development, pointed out: "The three problems we should see are: First, the TRIAC dimmer has one of the biggest drawbacks, namely, high power consumption, especially at light loads. At about 10% efficiency, PWM dimming is much better, and about 80% efficiency when the brightness is reduced to 50%. Second, any LED lighting driver solution that supports TRIAC dimming can't be supported. All TRIAC dimmers on the market. Third, the largest LED lighting application market (ie the global office lighting market) currently uses fluorescent lamps, and there is no TRIAC dimmer in its infrastructure, and this market will lead the family LED lighting The market started."
In order to overcome the above three problems, O2Micro invented a unique three-segment LED bulb / tube dimming technology, using the analog dimming technology in the patent application, it does not require a TRIAC dimmer, just use the power supply on the wall The switch can realize three-stage dimming (100%, 50%, 20%) without RF remote control circuit, so not only the dimming cost can be made lower, but also the remote control can be removed.
This three-stage dimming technique is even more efficient than the PWM dimming method. Guo Qingquan said: "OZ8022A and OZ9992 support 100%, 60% and 20% three-stage simulation dimming function. In the case of 26V/300mA output LED string and 85-265VAC wide input voltage range, the three-stage efficiency is greater than 86% respectively. , 82% and 77%."
OZ8022A and OZ9992 are two LED controllers that have been successfully developed by O2Micro to support three-stage analog dimming. The OZ8022A is the latest generation of products in the SOT-23-6 package. The OZ9992 is the previous generation and is available in SOP-8 package. The OZ9995 controller also supports three-stage dimming, however, it uses PWM dimming technology.
Guo Qingquan said: "OZ8022A is an improved version of OZ9992. Its application implementation is much simpler than OZ9992, so the BOM cost is also lower. At present, Japanese appliance manufacturer Orion Motor has introduced three-stage dimming LED based on OZ9995 to the commercial market. The lamp, with a power range of 5W to 8W and a working life of up to 40,000 hours, will be used in Orion's next-generation 4W, 6W and 9W LED bulbs. There are also several Japanese appliance manufacturers evaluating OZ8022A and OZ9992.
Whether it is a home user or an office user, three-stage dimming LED bulbs or tubes can effectively help users save energy costs. However, in actual use, since the brightness of different output power LED bulbs or tubes is different at 60% and 20%, many users want to adjust the brightness ratio of the three-stage dimming, in order to satisfy all The different requirements of these customers, O2Micro has been developing the stepless dimming technology in the past few years, it also does not need to use TRIAC dimmer, just use the wall power switch to achieve any brightness adjustment.
Outdoor Front Service LED Display
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Guangzhou Chengwen Photoelectric Technology co.,ltd , https://www.cwledpanel.com