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Under the influence of the policy drive and the long-life effect of LED lights, LED lighting entered the year of explosion in 2013, and the ushered in after the outbreak is bound to be a gradual decline in the market. According to market research reports, the sales of light sources are from In 2015, it began to decline year by year.
According to a report released by IMSReserch in April 2012, the price of LED lights tends to be lower than $30 in 2009, and will break through the $5 mark around 2017. The popularity of LED lamps depends on the speed at which their prices fall, while the 40 cost of LED lamps is spent on driving control circuits, so the cost reduction of control circuits including LED driver ICs is critical. Correspondingly, the cost of the drive control circuit is expected to decrease between 2013 and 2015.
Although the LED driver power supply has made a breakthrough in technology, the cost has been maintained at around 200 yuan. If the sales price is less than 400 yuan, it is basically a loss state, while foreign manufacturers such as Philips have the lowest sales price of 180 yuan. With the increase in labor costs, rent, marketing and office costs, LED drive power supply price reduction is quite difficult, many companies have to fill the cost pressure from technology and design.
Simplify the topology and reduce the price. It is necessary to optimize the structural design while continuously upgrading the technology and minimize the number of IC components. In the 9th LED General Lighting Drive Technology Seminar held on November 25, Guo Chunming from PI Point out that reducing the cost of LED bulbs requires changing the LED driver technology. In the report, Guo Chunming pointed out that with the advancement of LED drive technology, the conversion from two-pole driver to single-stage driver technology can reduce the cost requirement of the driver, and the choice of the available topology of the currently available LED driver is even more There is a tendency to use non-isolated drives. He also mentioned that using a buck converter in a topology is small, uses low drain-source voltage stress, and uses the fewest number of filter components, so it has the advantage of high efficiency and optimal EMI performance. Compared with the topology of flyback and unipolar PFC combined with constant current flyback, the cost is the lowest.
Guo Chunming also listed the requirements for the lowest cost lamp driver, such as the use of the most likely small heat sink to achieve high efficiency, input high voltage and low voltage, all need to meet the European Commission's environmental protection directive and ENERGY STAR consumer lighting requirements Use buck and buck-boost topologies and the simplest possible EMI filter circuit to achieve the lowest component count, use the fewest number of LEDs to meet the minimum brightness standard and reduce the temperature stress of the heat sink to achieve the production process Guaranteed output constant current. Reducing the cost of LED drivers through topology is only optimized in terms of design, and strict control of specifications is a key factor in ensuring product quality.
High-efficiency drives can be realized with simple settings. The specifications 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 board space. Achieve; and use the best design to meet the needs of consumers with minimal safety margin.
High-voltage linear constant current technology High-voltage linear constant current power supply does not have magnetic devices such as transformers, and there is no electrolytic capacitor, which can save one-third of the cost of general switching constant current power supply. Because of the simple structure of the system, only a few peripheral components are needed, suitable for Volume and cost requirements of the system, and with the emergence of HVLED lamp bead technology, non-isolated high-voltage linear constant current LED drive power technology has become a new hot spot for LED light source drive. Professor Yan Chongguang from the Shanghai Institute of Microelectronics, Peking University also demonstrated the HVLEDs high-voltage linear constant-current driving integrated photoelectric engine in the LED general lighting driving technology seminar: placing the driving power chip and LEDs lamp beads 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 scheme demonstrated in the field, there is no magnetic component, no EMI filtering, and built-in high-voltage power tube, which can be used to design and produce integrated photoelectric engine. However, this technology also has its limitations, and it has not yet been able to solve the problems of stroboscopic, PF, voltage regulation and other issues to be improved and solved.