1. Distributed constant current technology
The distributed constant current is: an independent constant current source is established at each parallel branch point, thereby managing, maintaining, controlling the branch and the overall line stability. It can be regarded as a complete line structure in use, and the practical application is constant current control distributed in each node of the line and can communicate with each other. Distributed constant current design LED products have very high product stability. At present, LED products claim a large gap with the actual service life. In the case of limited accumulation of drive line design technology, the life of the product is estimated to be far from the actual use. Drive line stability directly affects the overall stability of the product, and distributed constant current has a unique advantage.
Keeping the branch and the overall current stable, it is also convenient to control the management branch and the overall line work, which is the scope of distributed constant current technology. Driving the LED requires a constant current, but the magnitude of the current depends on the application environment. The intelligent development of LED lighting is the key, and the distributed constant current technology fully reserves the intelligent interface.
In the distributed LED driver design, the drive back search, color temperature adjustment, and gray scale control are all convenient. This is the necessity of the development of distributed constant current technology. The driving voltage should be properly adjusted according to the temperature change. The customer design varies the number of LEDs depending on the product. The branch constant current balance needs to be completed by the feedback line. LED is rapidly replacing CCFL as a new generation of backlights, but we found that color rendering is not good for CCFL, and color temperature can not be adjusted. It is not that we do not need LED color temperature to be adjusted. The key is that the design line does not support color temperature adjustment.
In LED applications, grayscale also needs to behave very well. Grayscale control is always confused with brightness. In fact, there is an essential difference. Grayscale control represents the level of intelligence, and brightness is only set in the product. Once, intelligence must not be able to withstand grayscale reproduction.
Another feature of distributed constant current technology is that the AC power supply section continues to use the traditional switching power supply, constant voltage power supply mode. The accumulation of switching power supply technology will create quality conditions for LED power supply design. Although accelerating aging to estimate power supply life is a method, there is still a gap between the long-term practical technology accumulation of traditional switching power supplies!
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