Low-power LED driver development tends to be non-isolated

From a global perspective, the popularity of LED lighting products has just begun. China's LED market has also become relatively stable after the first few years of stagnation and the reshuffle period in the past two years. Taiwan's LEDinside company expects that by 2015, China's LED lighting demand will reach 10 billion US dollars. In addition, both national policies and LED technology are promoting the popularity of LED lighting products. For example, since the first quarter of 2013, the EU has completely banned the sale of incandescent lamps; China has also banned the sale and import of 100W and 60W and above ordinary lighting incandescent lamps from October 1, 2012 and 2014 respectively. policy. Coupled with the report released by IMS Research in April 2012, the average selling price of global LED bulbs is expected to fall from $11 in 2013 to $7 in 2015.

Figure 1: The average selling price trend of LED bulbs.

40% of the cost of LED bulbs is the driver. To maintain a stable decline in the cost of LED bulbs, support for cost-effective drive products is required. Due to advances in technology and processes, drive costs are expected to decrease by 36% between 2013 and 2015. The small power supply industry generally defined boundary portion 18W, the power source is applied to substantially downlights, spotlights, spot lights and the like, and is mainly used in low-power supply and the lamp bulb. Due to the different installation methods of LED products, the lamp holders have different classifications, such as GU10, A19, PAR30, PAR38, etc. The bulbs mainly use GU10 and A19 lamp holders.

For the design of bulb power, cost, space and efficiency are the three most important factors to watch. Early LED bulb solutions typically used isolated single- or two-stage solutions, but in order to increase efficiency, reduce cost, increase output power, and meet limited space requirements, LED bulbs are now turning to design Non-isolated drive mode.

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