Due to the rapid development of LED industry, it has gradually shifted from government lighting to civil lighting. Thanks to a series of policies issued by China recently to encourage the development of LED industry, many problems have been brought about, and the problem of LED driving power has been exposed. Distributed constant current technology also has a feature that AC power supply 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 the power life is a way, and the traditional switching power supply long-term practical technology accumulation or some gaps!

The main features of distributed LED drive power are as follows:
(1) distributed LED drive power is a combination of constant voltage source and constant current source. According to the order of "constant voltage first, constant current later", one or several AC/DC constant voltage sources supply power to many independent DC/ DC constant current sources, and then each constant current source supplies power to one LED.
(2) power control, power management, power monitoring and communication functions can be realized through microcontroller (MCU). Power management refers to the efficient distribution of power to different components of the system to minimize power loss.
(3) high intelligence, hardware and software combination. Automatic sorting and tracking of LED drive power can be realized by software, that is, switching on or off the power according to the undetermined order in advance, and making each power supply can track each other during power or power failure to ensure the orderly work of each power supply.
(4) flexible use, standardized and modular design can be realized, and the system can be extended according to the number of loads. When a certain I)ED fails, it will not affect the normal work of other leds.
(5) easy for system dimming or regional dimming, and temperature compensation for LED, not only can obtain the best lighting effect, but also greatly improve the safety and reliability of the system.
(6) easy to achieve power factor correction (PFC), power factor can reach 0.99, power efficiency can exceed 90%.
(7) it has perfect under-voltage protection, over-voltage protection, over-current protection, short-circuit protection, over-power protection and over-heat protection functions.
(8) multiple DC/DC constant current sources are distributed to facilitate heat dissipation.
Constant current source placement point is flexible, in all parallel branches, will not affect the work of other branches due to branch current changes. All hope to select LED to get load impedance match, distributed constant current can be designed to become more perfect, the requirements are not very high can also be exempted from selection. The stability of lamps and lanterns can only be improved by keeping the current of each branch and the whole circuit stable.
The constant current source is placed in each parallel branch node, or in the overall constant current point design. The constant current source can play a good role in a certain position in the serial branch.
Generally, the number of constant current driving channels is difficult to match with the design, and distributed constant current will have a high degree of design flexibility.