With the rapid development of the LED lighting industry, the LED power supply market has also expanded rapidly. On the one hand, traditional power supply manufacturers have launched LED power products, on the other hand, many entrepreneurial companies have also been established. According to experts, analyze the four major development trends of LED power supply in the future. 1. Non-isolated DC/DC technology develops rapidly In recent years, non-isolated DC/DC technology has developed rapidly. At present, a set of electronic equipment or electronic systems requires the power supply system to provide multiple voltage levels due to different loads. For example, a desktop PC requires four voltages of +12V, +5V, +3.3V, and -12V, and a standby voltage of +5V. The motherboard requires 2.5V, 1.8V, 1.5V, or even 1V. It is impossible to give such a large voltage output in a set of AC/DC, and most of the low-voltage supply current is large, so many non-isolated DC/DCs have been developed, which can basically be divided into two categories. One type contains a power switching element internally, called a DC/DC converter. The other type does not include a power switch and requires an external power MOSFET called a DC/DC controller. According to the circuit function, there are step-down STEP-DOWN, boost BOOST, BUCK-BOOST or SEPIC which can be lifted and lowered, and INVERTOR which converts positive pressure into negative pressure. Among them, the most varieties, the fastest growing is STEP-DOWN. According to the size of the output current, it is divided into single-phase, two-phase and multi-phase. The control method is mainly PWM, and a small part is PFM. In the non-isolated DC/DC conversion technology, TI's pre-detection gate drive technology uses digital technology to control synchronous BUCK. The DC/DC conversion efficiency of this technology can reach up to 97%, of which TPS40071 is its representative product. The BOOST boost mode also has a synchronous BOOST product that uses a MOSFET instead of a diode. In the low-voltage field, the efficiency is increased to a large extent, and efforts are being made to further eliminate the conduction and reverse recovery of the body diode of the MOSFET. Second, the switching power supply blows the digital horn At present, in the entire electronic analog circuit system, television, audio equipment, photo processing, communication, network, etc. are gradually digitized, and the last fortress without digitization is the power supply field. In recent years, the research momentum of digital power sources has not diminished, and the results have been increasing. The companies that have taken the lead in power digitalization are TI and Microchip. TI has both DSP advantages and UNITRODE, a professional manufacturer of PWM ICs. The company has used TMS320C28F10 to make 48V output high-power power modules for communication. The PFC and PWM parts are completely digitally controlled. Now, TI has developed a number of digital PWM control chips. Currently mainly UCD7000 series, UCD8000 series and UCD9000 series, they will become the pathfinder of the next generation digital power supply. They generally include both hardware and software programming. The hardware part includes the logic part of the PWM, the clock, the analog-to-digital conversion of the amplifier loop, the digital-to-analog conversion, and the digital processing, driving, detection and processing of synchronous rectification. At present, the competition in the power supply field is mainly the competition of performance price, so digital power has a long way to go, but the digital horn of the power supply field has already blown. Third, the primary PWM control IC is continuously optimized Active clamp technology has lasted for more than ten years. Since the release of VICOR's patented technology in 2002, new active clamp control ICs developed by various companies have sprung up, providing users with sufficient select. TI, which controls the early active clamp control technology, not only maintains the original UCC3580 series, but also newly developed the UCC2891-94 with superior performance. It uses current mode control, which combines high-side clamp and low-side clamp. Two control schemes give new control techniques. OnSemi first introduced the NCP1560 control chip with low voltage (100V) active clamp, and then introduced the control chip NCP1280 for high voltage applications. It not only solves the requirements of LCD TV plasma TV power supply, but now also refers to the next generation fanless PC. power supply. The US NS company's 5000 series specializes in an LM5025 active clamp control IC. The unseen Semtech company also gives an active clamp control chip. The model is SC4910, which shows that there is a huge market behind it. Business. Until recently, TI's active clamp control ICUCC2897 has made the active clamp PWM control perfect. Taiwanese Fairchild has given the cheapest active clamp control ICs, the SD7558 and SD7559. In the high-power field, the full-bridge phase-shifting ZVS soft-switching technology contributes to the efficiency of switching power supplies. From TI's UC3875 to UCC3895, and from Linear's LTC1922 to LTC3722, adaptive detection technology has been added to make the full-bridge phase shifting technology reach its peak. However, today, when synchronous rectification technology is widely used, it cannot achieve optimal ZVS synchronous rectification. Because the full-bridge phase-shifting circuit is essentially asymmetric, it cannot achieve full ZVS synchronous rectification. Since half of its turn-on and turn-off processes are hard-switched, the efficiency is inferior to the ZVS mode of the symmetrical circuit topology. Synchronous rectification. The latest scientific and technological achievements should be the PWM symmetric full bridge ZVS control IC-ISL6752 from INTERSIL. It can control the four MOS switches on the primary side to the ZVS working state, and can accurately give the driving signal for controlling the synchronous rectification of the secondary side to the ZVS working state. With 400W DC/DC made by this IC and advanced power MOSFET, the conversion efficiency can reach 95%.
Solar road light is a crystalline silicon solar battery power supply, valve control type sealed and maintenance-free battery, gel battery) to store electrical energy, super bright LED as light source, lamps and lanterns and controlled by the intelligent charging and discharging controller, is used to instead of the traditional public power lighting lamps.
Solar road light working principle
1. Using the microcomputer intellective controller to transfer the light energy to electrical energy.Easy to install since to wiring and trenching,energy conservation and environmental protection.
2. The microcomputer intellective controller is composed by advanced special-purpose integrated circuit,high conversion efficiency,prevent over-load and over-discharge,Output short circuit protection,extend work life,on the safe side,convenient usage.
3. High effective Non-maintaining accumulator cell,strong storage,durable usage.
4. Automatic track type time controller,Automatically adjust the working time along with different illumination time in various seasons.For extending the work time energy conservation intellective controller with automatic shut-off the light at Deep-night.
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