LED display screens and LED display lights are different from incandescent lamps. They have their application flexibility. There will be a variety of power supply specifications in the design. In order to avoid many obstacles caused by mass production in the future, Shenzhen LED display manufacturers believe that excessive power supply specifications should be prohibited. The distributed constant current architecture is based on the principle of not restricting design flexibility while also taking into account the design of as few power supplies as possible. Specs of ideas.
The principle of distributed constant current is that an independent constant current source is set up at each parallel branch point to manage, maintain, and control the stability of the branch and the branch, the branch and the overall line. The distributed constant current circuit can be regarded as a complete circuit structure in use, and the actual application is distributed at each node of the circuit, and it is a circuit structure that can be controlled by constant current and can communicate with each other. Distributed constant current design LED products have very high product stability and unique design advantages.
At present, there is a big gap between the claimed and actual service life of LED products. In the case of limited accumulation of drive circuit design technology, using the method of evaluating product life to measure the actual life is easy to cause errors. The stability of the drive circuit will directly affect the overall stability of the product. The reason for the high reliability of the distributed constant current technology is that the AC power supply part continues to use the traditional switching power supply and adopts a constant voltage power supply mode. The accumulation of switching power supply technology will create quality conditions for LED power supply design. Under the same power supply specifications, there is no need to develop new power supply models, and the power can be backward compatible, which greatly reduces the power supply specifications and improves the uniformity of the power supply.
When it comes to LED driving accuracy, constant current error is usually thought of. In fact, driving accuracy is not limited to current accuracy. LED is a typical current-driven device. The precise control of LED drive current can determine many parameters including light efficiency, power efficiency, heat dissipation, and product brightness. The main reason for driving an LED is to control its current. Whether it is to directly increase or decrease the drive current, or the duty cycle (PWM) to reduce the switching time ratio, both are control current methods, but they achieve different goals.
