Solar energy promotes the development of LED lighting

Solar energy promotes the development of LED lighting




LED in recent years has been a very wide range of applications, including the backlight, indoor and outdoor displays and lighting, etc., in the LED driver IC market, which involves the power product line with the semiconductor industry, the basic are being progressively introduced continuously from a low-power to a variety of high-power LED driver products.



People before the concept of the semiconductor green lighting stay in LED lighting, LED luminous efficiency enhancement as well as declining costs, LED lighting penetration has increased significantly. Now, the popularity of new energy sources solar cells, allows us to generate electricity using semiconductors, semiconductor and semiconductor LED light source control circuit consisting of a true green and intelligent lighting systems.



Energy-efficient LED, coupled with clean energy, solar energy is composed of the attractive prospects, but also makes the cost of the maturity of technology, a sharp decline, or even sold on the network mini-solar LED flashlight a few dozen yuan. In addition, a larger scope, we find that solar energy is becoming increasingly popular street.

A large part of the popularity of solar energy street lamp because simple installation can be inserted on the roadside, and rather than using alternating current needs of the street as shops cables, the construction of transformer room and so on. However, unlike other power supply of the LED (eg AC), solar-powered LED panels have special requirements, such as solar LED lights are used in battery output voltage instability, which need to address the issue of constant-current drive, a special solutions, including the Shanghai Long-mao Microelectronics Power Analog Microelectronics Corporation and completed SLM2842 module companies, National Semiconductor Corporation's off-line constant-current control driver and so on.



Weather determines the instability of solar-powered, so there is a program that is the exchange of electricity and solar hybrid power supply, but this is left to the designer's challenge is how to design a type of instability efficient automatic dimming of the LED streetlight solution? LED lights generally require more than 25W power, depending on the scope of required lighting and installation of fixed height, Arrow developed based on the AC mains input solution of choice for LED street lamps lighting the Cree-level XLampMC-ELED, NXP of the PFC controller and the Anti-shock controller, SSL1750, as well as TI's DC / DC constant current controller, TPS40211, perfect to solve this problem. Where, XLampXR-ELED is a lighting-class multi-chip module, the number of lumens per watt up to 107; NXP's SSL1750 is a suitable for driving 25W to 250W of LED lighting applications, switching power supply controller IC; SSL1750 integrated PFC controller and a flyback controller, making AC / DC conversion efficiency of more than 90%; TPS40211 is a wide input (4.5V to 52V), non-synchronous boost controllers.



Controller is mainly used to control the battery charger and battery power to the LED. LED constant current controller to ensure that work, will also monitor the status LED as well as control the length of working hours. Continuous overcast and rainy days, as well as the absence of sufficient battery power, the controller will issue a control signal to start the external electricity supply system to ensure the normal operation of LED. The controller is controlled via a MCU to achieve, MCU's main duties include the following: First, use of MPPT algorithm to optimize the efficiency of solar panels; two different states against the use of appropriate battery charging mode; 3 is to ensure that LED The constant current drive circuit output; Fourth, to determine day and night, and as a means of switching battery charge and discharge mode; the last is to provide monitoring and protection, temperature monitoring, status output and user control input detection. In a variety of MCU program, STMicroelectronics is based on the introduction of a complete solar LED street light STM32MCU program.



Currently, most solar power inverter solar panels can only come from one of the best position of the solar panels to optimize the overall efficiency. This optimization method has seriously hampered the efficiency of solar power generation systems. National Semiconductor SolarMagic technology will bring about innovation in solar photovoltaic system. SolarMagic is not a single IC, the shape of the module shape, size 10 × 12cm or so. The technology can be intelligent management of solar photovoltaic (PV) power panels can monitor and optimize each cell board capacity, so that they can be the best power point to run, and to improve the current flow in the battery plates. Through the use of SolarMagic technology, solar power generation system Ke Wanhui more than 50% loss due to transmission, or a shadow mask with the loss of generating capacity.



Prospects



Progress of the semiconductor industry, the mobile phone, PC and so became a common necessity. Although the current situation is sometimes the cost of new energy sources is not inferior to the use of traditional energy sources, such as the cost of electricity, compared with the existing solar / wind power generation cost to be several times higher. But no doubt, new energy has clearly risen to the height of the national strategy, the inevitable advances in technology will bring new energy into a mobile phone and PC similar to the same universal necessity.



All signs indicate that the new energy will be low-carbon economy based on a modern technological revolution. Can be predicted that 2010 will surely be a big fuss around the new energy a year, not just solar / wind power generation, new energy vehicles, new energy lighting, as well as the broader application of waiting to be excavated. The future of new energy industry value chain will focus on the collection of new energy and new energy utilization, more efficient collection and open up new applications of new energy sources for semiconductor manufacturers to develop new value to growth.

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