Discussion on the problems and defects of silicon controlled dimming

Review: so far, many large chip companies have launched a special compatible with the existing SCR dimming compatible chips and solutions, but these solutions will still have some shortcomings. At the same time, compatible SCR dimming LED is still restricted in the market, the market acceptance is not so high, the reasons are as follows:

(1) the development of SCR technology has been an old technology with more than half a century. It has many disadvantages, such as the former, is a kind of technology that should be eliminated. Social development requires a more advanced and intelligent product to replace it.

(2) currently compatible with silicon controlled light LED driver IC, a lot of claiming to have PFC, can achieve high power factor, it actually improves the power factor of the load, the whole circuit looks closer to the pure resistance, power factor and it is not improved, including silicon controlled the whole system.

(3) as mentioned above, in order to keep the thyristor holding current shortage, many compatible with the LED SCR dimming system needs additional discharge resistance, thereby increasing the loss making LED the efficiency of the whole optical system is very low, this is completely damaged LED high efficiency purpose.

(4) the current market of silicon controlled dimming LED systems is uneven, and the true match of the LED drivers that are compatible with all SCR dimming is virtually absent, which virtually increases the number of development tasks. In addition, the true matching of all SCR dimmer LED driver has yet to be a long time reliability verification.

(5) incandescent lamp and halogen lamp installation SCR dimming the proportion of less than 1/10000, and the installation of thyristor switch in the wall lamp in the proportion of SCR dimmer in even less than 1/10000, because the vast majority of the installation SCR dimming is lamp, bedside lamp, lamp. What's more, there are dozens of different specifications of the SCR and transistor dimming switch, in fact, the development of the IC can not be compatible with all SCR switches, but only a small part of which can be compatible.

(6) LED is a completely new technology, which has incomparable superiority. In the face of the increasingly mature market demand for dimmable LED lighting products, silicon controlled dimming LED driver development needs to be sustained.

Silicon controlled rectifier is widely used in the traditional lighting market such as incandescent lamp, which is easy to be used by consumers. Therefore, the promotion of LED SCR has a good market prospect. However, in applications where the vast majority of LED dimming, SCR dimming circuit in the power factor, adjustable light flashing light adjusting performance and cost aspects still need further efforts to expand the SCR dimmer in the range of application of LED lighting dimming.