Route analysis and high voltage design of LED lighting fixtures

The lighting fixture design is based on a three-way game of LED lighting, drive control and optical cooling structure design.

1. Luminous part: LED light-emitting chip continues to improve light efficiency, LED energy-saving controversy is slowly faded. In the next few years, there will be further improvement, and the accelerated application of LEDs will lay a solid foundation, and the lighting design will become simple. The packaging method will change according to the application of the luminaire. For a long time, according to the LED heat dissipation, the package design is developed. With the understanding of the heat dissipation of the LED package, the package form of the special luminaire is more suitable. The upstream investment of LED epitaxy has increased, competition has intensified, and downstream applications have not yet risen, which will inevitably lead to a significant drop in the price of LED chips. Compared to packaging costs, the speed is much faster, and some LEDs are already lower than the cost of packaging. Therefore, packaging technology innovation is also one of the most important parts of LED development.

2. Drive Control: Increased drive conversion efficiency is one of the most effective solutions. Increasing the power conversion efficiency can reduce the overall lamp power, which is to improve the overall lighting efficiency and save the heat dissipation design cost. There is no regulatory requirement for switching power supplies before power factor requirements, but LED lamps have a hard target. Reliability and longevity are also important parts of the current situation. There are also aspects of color temperature, brightness, and intelligence that are also in the future, at a later time.

3. Optical design and heat sink: The optical design is user-friendly, and the design of the lamp has recently developed rapidly, starting with an alternative route. In the future, LEDs should develop LED products that are more suitable for LEDs. The heat dissipation structure tends to be more rational, and more standardized module light sources show advantages. New material cooling technologies are being introduced, and the cost will be further reduced.

We want to give the company a positioning, a competitive base. We understand the power drive design, find breakthrough points here, and focus on the development of the future. We need to develop some new driving methods to completely eliminate electronic transformers, inductors and electrolytic capacitors in order to truly improve the life of the lamps. Specially built-in power supply luminaires, internal components up to hundreds of degrees Celsius, including electrolytic capacitors, magnetic materials and enameled wire are threatened by short life.

According to the analysis, only the LED lamp indicators of the short-lived devices can be comprehensively improved, and the inductors, electronic transformers and electrolytic capacitors can be eliminated, and the life and volume problems can be completely solved. Improve power drive efficiency and reduce heat source to extend lamp life. It is well known that only innovative technologies can make their own leap-forward development and intercept the LED technology evolution path. Only independent innovation, access to more intellectual property rights, paving the way for the subsequent development of LED.

Cancellation of the power supply is not understood as the need for a drive, and it is not required to be powered. Instead, some of the devices that hinder the life of the power supply are eliminated. A new LED driving method is called "De-Power Technology".

The development of "de-powered design" must develop high-voltage LEDs. Multiple LEDs can be called high-voltage LEDs. The serial connection methods include lithography, flip-chip connection, cob gold wire connection, and PCB single-particle soldering. Changyuntong chose lithography technology. We are a professional integrated circuit design company, knowing the maturity and production efficiency of lithography. We appreciate the flip-chip technology, and it takes time to get the price that can be accepted by the market. When COB gold wire is connected, it is difficult to guarantee the quantity of too much quality. The efficiency of absorption of blue light by gold wire will be reduced, and the price of gold will be firm. Therefore, COB gold wire connection can only be used as a market segment, and the popularity of scale is limited.

Changyuntong Optoelectronics Research believes that the current design of lamps uses a single-particle low-voltage LED, which is the main reason for the design of lamps requiring power conversion. The best way to get the best drive efficiency is to get the LED voltage closer to the drive voltage. In this way, the power conversion is not required, and the circuit structure of the constant current source is simplified to complete the driving task.

Changyun Optoelectronics found that LEDs have the same characteristics as incandescent lamps. The incandescent lamp adopts tungsten filament illumination, which can adapt to 1.5-380V voltage, and obtain different impedance through the thick and short tungsten filament to adapt to different voltage driving requirements. LEDs can also be connected in multiple numbers to obtain different high voltage values. The nominal voltage is visible as a guide for developing high voltage LEDs. In fact, foreign AC LEDs and high-voltage LEDs are also realized through lithography. Officially, due to deviation from the nominal value guide, they have not been able to find the correct market position.

Need to develop several nominal voltages? Changyuntong Optoelectronics Research believes that the mains voltage of each country is mainly 110V and 220V, and the same power source can be obtained under the same power. To this end, the city's centralized development of a 110V-LEDs can meet the lighting needs. In the low-voltage power supply part, the switching power supply forms a nominal voltage of 12V, 24V, 36V, 48V for a long time. The car is 12V or 24V. Both wind and solar energy require energy storage of lead-acid batteries. The need is 12V and 24V. 12V-LED design, because 24V, 36V, 48V are multiples of 12V, LEDs can be connected in series under normal conditions, all of which can be flexibly designed.

High-voltage LEDs can eliminate the need for power supply voltage conversion in our designs, or use traditionally proven switching power supplies without the need to develop new power systems. At the same time, we welcome new power supply design to support LED, but we need to ensure the life of our design lamps and improve the reliability of LED products based on the verified power supply.