Currently, countries and regions around the world have begun to ban the use of incandescent lamps. Driven by the policy and the long-life effect of LED lights, LED lighting entered an outbreak year in 2013, and after the outbreak, the market will gradually decline, according to the market share report of the market research agency HIS. The sales volume of lamp sources has been declining year by year since 2015.
Driven by the policy and the long-life effect of LED lights, LED lighting entered the outbreak year in 2013, and after the outbreak, the market will gradually decline, according to the market research agency HISResearch's lighting market share report shows The sales volume of lamp sources has been declining year by year since 2015.
According to a report released by IMSReserch in April 2012, the price of LED lights tends to fall all the way down to US $ 30 in 2009, and will break through the US $ 5 mark around 2017. The popularization process of LED lamps depends on the speed of their price decline, and 40% of the cost of LED lamps is spent on driving control circuits, so the cost reduction of control circuits including LED driver ICs is crucial. Corresponding to this, the cost of drive control circuits will be expected to be reduced by 36% between 2013 and 2015.
Although the LED drive power has made a breakthrough in technology, the cost has been maintained at about 200 yuan. If the sales price is less than 400 yuan, it is basically a loss. However, the lowest sales price of foreign manufacturers such as Philips can achieve about 180 yuan. With the increase in labor costs, rent, marketing and office costs, it is very difficult to reduce the price of LED drive power, and many companies have to fill the cost pressure from technology and design.
Simplified topology
To reduce the price, we must optimize the structural design while continuing to upgrade the technology to minimize the number of IC components used. At the 9th LED General Lighting Driving Technology Seminar held on November 25, Guo Chunming from PI pointed out that the reduction The cost of LED bulbs requires a change in LED driver technology. In the report, Guo Chunming pointed out that with the advancement of LED driver technology, the conversion from two-pole driver to single-stage driver technology can reduce the cost requirements of the driver, and the choice of topology of the currently available LED drivers is even more Many places tend to use non-isolated drivers. He also mentioned that the use of a buck converter in the topology is small, uses low drain-source voltage stress, and uses the least number of filter components, so it has the advantages of high efficiency and optimal EMI performance. Compared with the topology of the combination of flyback and unipolar PFC and constant current flyback, its cost is the lowest.
Guo Chunming also listed the relevant requirements for the lowest cost light bulb driver. For example, when using the smallest possible heat sink to achieve high efficiency, high voltage and low voltage input, they must meet the European Commission ’s environmental protection setting directive and Energy Star ’s consumer lighting requirements , Use buck and buck-boost topologies and the simplest possible EMI filter circuit to achieve the minimum number of components, use the minimum number of LEDs to meet the minimum brightness standard and reduce the temperature stress of the heat sink to achieve in the production process Medium guarantees constant output current. Reducing the cost of the LED driver through the topology structure is only optimized for the design of the enterprise. Strictly grasping the specifications is the key factor to ensure the quality of the product.
High-efficiency drivers can be achieved through simple settings. The specifications set must be accurately grasped. Excessive specification design will lead to an increase in product cost; in terms of assembly cost savings, functions can be integrated to reduce circuit board space. To achieve; and use the best design can meet the needs of consumers with the smallest safety margin.
High voltage linear constant current technology
The high-voltage linear constant current power supply has no magnetic devices such as transformers and no electrolytic capacitors, which can save one-third of the cost of the general switching constant current power supply. Due to the simple structure of the system, only a few external components are required, which is suitable for the volume and cost requirements With the emergence of HVLED lamp bead technology, non-isolated high-voltage linear constant current LED drive power supply technology has become a new hot spot for LED light source driving. Professor Yan Chongguang of Shanghai Microelectronics Research Institute of Peking University also demonstrated the integrated photoelectric engine of HVLEDs + high-voltage linear constant current drive in the LED general lighting drive technology seminar: the driving power chip and LEDs lamp beads are placed on the copper-clad aluminum substrate On the same side, it facilitates the automated production of SMT.
The power supply has no transformer and no electrolytic capacitor, and the production cost is low. In the high-voltage linear constant current solution displayed on site, there are no magnetic components, no EMI filtering, and a built-in high-voltage power tube, which can be used to design and produce an integrated photoelectric engine. However, this technology also has its limitations, and it has not yet been able to solve the problems of strobe, PF, voltage regulation and other issues that need to be improved and resolved.
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