Although led lighting is optimistic, the industry is also investing a lot of efforts in the field of LED chips , but in terms of circuit design, it is still an important role in driving LED light sources, even if the chip and package are done well, the circuit design is not good. In vain, in summary, the circuit design of LED lighting is still not a few basic points of volume and cost, but PFC is also one of the important reference indicators.
Observing from the overall LED lighting system, the LED chip and packaging field account for a relatively high proportion of the overall cost. However, although the circuit design is not high, it is a relationship between energy saving and carbon saving. How can it be reduced in power consumption? Power consumption has become a problem that system operators must consider. On the other hand, LED lighting also faces many design requirements such as cost, service life and volume. In the case of facing many requirements at the same time, system operators also pass on pressure to semiconductors. The industry also has the semiconductor industry to face some challenges in the provision of solutions.
There are also slight differences in the application of different circuit design concepts.
The application fields of LED lighting can be roughly divided into indoor, outdoor and automotive lighting. Although these three types of fields can still be subdivided into quite a few categories, in general, there is not much difference in circuit design. The differences are mostly in terms of operating temperature, system volume, reliability and cost. For example, indoor lighting applications, such as home or commercial, will pay more attention to cost and system volume. If it is outdoor lighting, it may not need to consider the cost, but in terms of operating temperature and reliability, it will be relatively It is important to come. As for the lighting of the car, although the help of the AC-DC component is not required, it is highly correlated with personal safety, and it is also particularly demanding in terms of reliability and life.
Different indoor and outdoor requirements
Compared with indoors, outdoor lighting has a harsh operating environment, and the level of supply is quite large. However, there is no clear standard for outdoor lighting at this stage. It is expected that the outdoor lighting market will continue to grow in the future. time. However, apart from the external environment, in fact, the power demand of outdoor lighting is higher. The main reason is that there are more LED lights. After the series connection, the power will also increase. If it is carried out in parallel, it will also face The problem of turn-on voltage, so if you want to develop outdoor lighting, the solution must be relatively complete to meet the design requirements.
Both indoor and outdoor lighting require AC-DC components for AC/DC conversion, but DC-DC assistance is still required to illuminate the LED source. Although both types of components are important, the former must carry a high voltage of 110V or 220V. It is not easy to enter the threshold, the latter enters the threshold low, and the competition is more intense.
In larger LED lighting fixtures, such as street lighting, which typically exceed 50W, the associated isolated design will most likely employ a secondary power architecture that includes front-end and back-end stages. The front-end stage will provide power factor correction, while the back-end stage will provide isolation and regulation of current to drive the LED load.
In terms of circuit design, there is not much difference between outdoor and indoor lighting. The main difference is that the operating temperature is about 85 to 105 degrees Celsius, but in Japan, it may be as high as 125 degrees, visible light. The threshold is quite high in terms of outdoor operating temperature requirements. In addition to special operating temperature requirements, outdoor lighting can be compared with industrial grades in terms of safety, whether it is reliability, product life or lightning protection. These are also areas for outdoor lighting.
Car lighting requirements are still a top priority
As for the lighting of the car, there will be temperature requirements. Chen Guangji, senior market engineer of the National Semiconductor (NS) Asia Pacific region, said that the car lighting does not need to use AC (alternating current), it is directly using 12V DC (direct current), the circuit The design is relatively easy, but the general vehicle lighting temperature requirement is about 105 degrees Celsius, plus the temperature change will affect the stability of the power supply. Furthermore, the application environment belongs to the automotive field, and safety is also considered. Reliability, life and stability, etc., so the circuit design is no less difficult than other applications.
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