Cost control of LED power supply is expected to decrease in 2015

Driven by policies and the long-life effect of LED lamps, LED lighting entered an outbreak year in 2013, and what will come after the outbreak is bound to be a gradual decline in the market, according to the lighting market share report of HISResearch, a market research organization, the sales volume of lamp sources has declined year by year since 2015. According to a report released by IMSReserch on April 2012, the price of LED lights will often go down by US $30 in 2009 and will exceed the US $5 mark around 2017. The popularization process of LED lamps depends on the decline rate of their prices, and the 40 cost of LED lamps is spent on driving control circuits, so the cost reduction of control circuits including LED driving IC is crucial. With this relative should be of IS drive control circuit cost will be in 2013 to 2015 between is expected to reduce 36. Although the LED driving power supply has made some breakthroughs in technology, the cost has been maintained at about 200 yuan. If the sales price is less than 400 yuan, it is basically in a loss State, however, foreign manufacturers such as Philips can achieve about 180 yuan at low sales prices. With the increase of labor cost, rent, marketing and office cost, it is quite difficult to reduce the price of LED drive power supply, and many enterprises have to fill the cost pressure from technology and design. To simplify the topology and reduce the price, we must optimize the structural design while continuously upgrading the technology and greatly reduce the number of IC components. In the 9th LED general lighting drive technology seminar held in November 25, guo Chunming from PI pointed out that to reduce the cost of LED bulbs, it is necessary to change the LED driver technology. In the report, Guo Chunming pointed out that with the progress of LED drive technology, the conversion from two-pole driver to single-stage driver technology can reduce the cost demand of drivers, however, in the selection of available topologies for currently available LED drivers, non-isolated drivers are more likely to be used. He also mentioned that the buck converter used in the topology is small in size and uses low drain- The source voltage stress and the number of filter elements used are small, so it has the advantages of high efficiency and good EMI performance, compared with the topology of flyback and unipolar PFC combined with constant current flyback, its cost is low. Guo Chunming also listed the relevant requirements for low-cost bulb drivers, such as the use of possibly small heat sinks to achieve high efficiency, input high voltage and low voltage, it is necessary to meet the consumer lighting requirements of the European Commission's environmental protection setting directive and energy star, and to use step-down and step-down methods- The boost topology and EMI filter circuit are as simple as possible to achieve a small number of components, use a small number of LEDs to meet the low brightness standard and reduce the temperature stress of the heat sink to ensure in the production process. output constant current. Reducing the cost of LED drivers through topology is only an optimization in design for enterprises. Strict control of specifications and parameters is the key factor to ensure product quality. High-efficiency drivers can be realized through simple setting, and the set specifications need to be accurately grasped. Excessive specification design will lead to an increase in product cost; In terms of saving assembly costs, functions can be integrated as much as possible to reduce circuit board space; The use of good design can meet the needs of consumers with a small safety margin. High voltage linear constant current technology, high voltage linear constant current power supply has no magnetic devices such as transformer and electrolytic capacitor, which can save 1/3 of the cost of general switching constant current power supply. Due to the simple structure of the system, only a few peripheral components are needed, which is suitable for systems with volume and cost requirements. With the emergence of HVLED lamp bead technology, non-isolated high voltage linear constant current LED driving 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 showed the integrated photoelectric engine driven by HVLEDs high voltage linear constant current at the LED general lighting drive technology seminar: the driving power chip and LEDs lamp beads are placed on the same side of the copper-aluminum substrate, which facilitates the automatic production of SMT. The power supply has no transformer and electrolytic capacitor, and the production cost is low. In the high-voltage linear constant current scheme displayed on site, there are no magnetic components, no EMI filtering and built-in high-voltage power tubes, which can be used to design and produce integrated photoelectric engines. However, this technology also has its limitations, and has not yet been able to solve the problems of stroboscopic, PF, voltage regulation rate and so on, which need to be improved and solved.