LED street light drive power supply price dropped by 30%

According to media reports, Shenzhen LED industry achieved an annual output value of 24.5 billion yuan in 2009, and the annual average growth rate of over 30%, the market prospects are bright. However, in the recent media, there has been a realistic comment that "the industry is hot and the market is cold and trembling." The reason is that price is the culprit. Below we will analyze the possibility of falling prices from the current LED street light products on the market.

LED street light is mainly composed of three parts, one is LED light-emitting components, the other is driving power supply, and the third is structural parts such as lamp holders. Structural parts such as lamp holders are currently highly competitive in the market, and the price is already very low. The high-quality luminescent components are basically imported from the United States, Japan, Germany, South Korea and other countries, and the price has also been reduced to a certain extent. For example, when the 350 mA white LED was just launched, the purchase price was 6-10 US dollars. At present, the imported 350mA white LED can be purchased at a purchase price of less than $2.50. However, such components do not have pricing power and bargaining power in China, and the price reduction can only be determined by foreign OEMs. Therefore, at present, it is necessary to reduce the cost of LED street lamps, and driving power is the only way. Below we will understand the composition of the LED street light drive power.

The white LED must be driven with a constant current source so that the white spot does not change (ie the brightness must be the same). In addition, since the white LED is a diode, its internal forward voltage drop (Vf) must be overcome. Vf varies with the white LED current value and also with temperature. In general, the Vf of a 350mA white LED varies from 2.9V to 3.7V over the entire operating temperature range. Most applications use multiple white LEDs, and these LEDs can also be configured in parallel, series, or series-parallel hybrids. This means that a white LED driver IC must be able to supply enough current and voltage for multiple LEDs in a particular configuration, and the voltage conversion topology used in this IC must meet both the input voltage range and the output voltage and current requirements.

At present, a single LED circuit on the market generally has 10-20 LED lamps connected in series, and the entire street lamp needs a series circuit of 4-20 channels. In order to ensure that the brightness of the LEDs in each circuit is the same, it does not appear in the same street lamp, and the driving power supply must have a dedicated part to ensure constant current of each street lamp circuit. Therefore, the mainstream LED street lamp driving power supply on the market is composed of two parts. One part is a constant voltage source, which is used to rectify the mains and is converted into a stable DC. The part is a constant current source to ensure the brightness of each lamp is consistent.

In order to reduce the cost pressure of street lamp manufacturers. Recently, after a long period of technical research and testing, CLP Huaxing Technology R&D team officially launched a single-channel, multi-channel (up to 20 channels) output constant voltage and constant current integrated isolation waterproof LED street light power supply based on the two-stage drive solution. The module product, the volume remains unchanged, and mass production has been achieved.

The LED driver power supply encapsulates the isolation module, switching power supply and constant current module in a module. It adopts the unique patented technology of CLP Huaxing. The constant current output single channel can select 350mA, 700mA or other values. All products pass 8000KV surge voltage test. The new product introduces voltage and current feedback control, and the user can change the load LED array form and the number of LEDs as needed to obtain different output power. After actual testing, the power supply overcomes the color change of LED light caused by input voltage, ambient temperature and other factors, the power factor is above 0.95, the life can reach more than 50,000 hours, providing three-year warranty, with overvoltage and overcurrent protection. .

After costing, the cost of this series of products is reduced by 30% compared with the two-tier products.

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