LED drive design differences in different market needs

LED lighting, although 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. Lin Zhiyan, technical marketing manager of ON Semiconductor's computing and consumer products group, pointed out that as far as he observes, lighting companies are quite strange to circuit design. This kind of problem is usually left to the semiconductor industry to find a way to solve the problem. The industry can spend more effort on the organization, optics, heat dissipation and exterior design to achieve twice the result with half the effort.

Lin Zhiyan further pointed out that because the lighting industry is quite strange to the circuit design, in order to meet the requirements of appearance or design, the semiconductor industry must assist the customer to solve all the problems as far as possible, plus the need for rapid mass production. In the design of the development of the circuit board, as far as possible, the goal of "sending immediately" is to be able to enter the shipment process in the shortest possible time.

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.

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