A. LED lighting line analysis
Lighting design, LED-based light-emitting part of the drive control section and the optical cooling structure design tripartite game.
A light-emitting part: LED light-emitting chip optical efficiency of continuous improvement, LED energy saving controversy fade away. In the next few years, there will be further improved, laid a solid foundation for accelerated LED application lighting design will become simplistic trend. Package based lighting applications, a long time in accordance with the led 1w heat dissipation in the development of package design, with the understanding of heat for the LED package, the more suitable special lighting package will continue the birth. LED epitaxial upstream investment to increase competition, downstream applications is not up yet, will inevitably lead to a substantial decline in the price of LED chips. Compared to the package cost to reduce the speed is much faster, some LED costs have been lower than the package cost, so the most important part of the package of technological innovation is the development of LED.
(2) The drive control: drive the conversion efficiency is one of the most effective solution. To improve power conversion efficiency, can reduce the power of the whole lamp, in the upgrading of the entire lighting efficiency, saving the cost of thermal design. Switching power supply before the demand for power factor regulatory requirements, but the LED lamps countries have rigid targets. Reliability, increase in life is an important part. There are aspects of color temperature, brightness, intelligence is the future demand at a later time.
Optical design and the heat sink: the optical design of human nature, light design recently developed rapidly, or along the alternative routes. The more appropriate LED to develop LED lighting products, thermal structure become more reasonable, more standardized module light source to reveal the advantage. New materials, cooling technology is launched, the cost will be further reduced.
We need to give the company a position, a competitive basis points. A better understanding of power-driven design, where to find a breakthrough point, the focus of analysis to formulate future development. We want to develop some new drivers to completely cancel the electronic transformer, inductors and electrolytic capacitors, in order to truly improve lamp life. Special built-in power lamps, the internal device of up to hundreds of degrees Celsius, including electrolytic capacitors, magnetic materials and enameled by the short-lived threat.
Analysis, only to cancel the short-lived device led 10w indicator to improve the abolition of the inductor, electronic transformer, electrolytic capacitors and a thorough solution to the life and volume. Enhance the power drive efficiency, reduce the heat source to extend the lamp life. Aware that the only innovative technology to make itself leapfrog development, intercepted on the road of LED technology evolution. Innovation, more intellectual property rights, and to pave the way for the development of follow-up LED.
Cancel the power supply can not understand and do not need to drive more than not "power". But to cancel the power in the hinder part of the life of the device, a new LED driver, named "de-power technology.
Two. High voltage nominal value of LED design
Development of the "de-power design must be to develop high-voltage LEDs for the LED connected in series can be called a high-voltage LEDs for, concatenation There lithography, flip-substrate connections, COB gold wire connection, PCB and single-particle welding. L Express selected lithography, we are professional IC design company, well aware of the maturity and efficiency of lithography. We very much appreciate the flip technology, to allow the market to accept the price, you need the test of time. COB gold wire connection, the volume of quality is difficult to ensure that the gold line absorption Blu-ray efficiency will reduce the price of gold firm, COB gold wire connection only as a market segment applications, the scale of the popularity of limited.
The Changyun Photoelectric that design lamps use of the single-particle low-voltage LED, which is the main reason for the design of lighting power conversion. To get the best drive efficiency, the best way is to allow the LED voltage is closer to the drive voltage value. So as not to need the power conversion circuit structure is simplified by the constant current source driven tasks can be completed.
The Changyun photovoltaic research, the LED and incandescent same characteristics of a. Incandescent lamps with tungsten light, 1.5-380V voltage can be done to adapt to the length of the tungsten thickness for different impedance, to adapt to different voltage drive requirements. The LED can also be more than the number of cascading different high voltage values, showing that the nominal value of voltage is the development of high-voltage led power 10w oriented standard. Foreign exchange LEDs and high-voltage LED is achieved by lithography, the official actually deviate from the nominal value-oriented standard, has failed to find the right market positioning.
Need to develop several of the nominal value of voltage? The Changyun photoelectric studies suggest that the countries in the mains voltage is 110V and 220V, the same power string and you can get to the same power source. To this end, the mains focus on the development of a 110V-LEDs can meet the lighting needs. In the low voltage power supply section, switching power supply long-term formation of 12V, 24V, 36V, 48V nominal threshold voltage, the car is 12V or 24V voltage, wind and solar require lead-acid battery energy storage, need to be 12V and 24V. This should focus on considering 12V-LED design, 24V, 36V, 48V are 12V multiples of LEDs connected in series, under normal circumstances, can be a flexible design products.
High-voltage LEDs can make our design no longer requires a power supply voltage converter, or follow the traditional mature switching power supply, do not need to develop new power system. Also welcomed the new power design to support the led power 50w , but need to be able to power on the basis of verified to ensure that our design lamp life, improve the reliability of LED products.
Three. To the power supply design
Figure 1 shows several main design approach, the AC-LED because of the rectifier bridge section also uses the LED assembly design, part of the rectifier bridge is also a light-emitting part. The advantage is that the volume can be designed to a minimum. The drawback is that in a small volume of concentrated heat, while insulation treatment, the highest design cost. Again because of the LED itself reverse voltage is low, only about 10V, so that to obtain a few hundred volts reverse rectifier pressure, 30% LED particles to waste. Therefore, the AC High Power LED 50W development the past few years have been unable to allow customers to accept the price. But analysts believe there will still be 5% of market opportunities, because the AC LED smallest market segment for high volume requirements.