In the past incandescent and energy-saving lamps market, LEDs have become a mainstream lamp type with limited specifications, and it is difficult for LEDs to continue to comply. LEDs have the flexibility of application and will bring more power specifications in future designs.
1 Introduction to distributed constant current drive principle
The principle of distributed constant current is to establish independent constant current sources at each parallel branch point to manage, maintain and control the stability of branches and branches, branches and overall lines. The distributed constant current circuit can be regarded as a complete line structure in use, and the practical application is distributed in each node of the line, which is a circuit structure that can be controlled by constant current and can communicate with each other.
At present, LED products claim a large gap with the actual service life. The stability of the drive line will directly affect the overall stability of the product.
The reason why the distributed constant current technology has high reliability is that the AC power supply section continues to use the conventional switching power supply, and the constant voltage power supply mode is adopted. The accumulation of switching power supply technology will create quality conditions for LED power supply design. Under the same power supply specification, it is no longer necessary to develop a new power supply model, the power can be backward compatible, greatly reducing power supply specifications and improving power supply uniformity.
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