What role does the light controller and driver play in the LED street light component?
At present, the pulse drive chip is powered by a high frequency pulse generator output interface to the LED lamp. Because the pulse signal frequency is very high, so the human eye can not feel the LED strobe, so this method meets the visual needs, and on the one hand, effectively save the power output. Also, the frequency of this type of chip can generally be controlled by an external interface. However, the current frequency of this type of chip is generally in the range of 100KHz~500KHz. So the current drive capability is only suitable for low power applications. However, I believe that in the near future will be elevated to high-power LED driver occasions.
Constant current drive chip solves the problem of uncontrollable current before constant voltage drive. At present, the constant current chip can achieve constant current accuracy of about 1%, and has a simple peripheral control interface, which can flexibly set the required output current, so it is very popular. But these chips are much more expensive than constant chips, and peripheral circuits are complex. At the same time, because of the constant output current, the whole chip will discharge faster when the battery is used as power supply.
At present, light emitting diode driver chip can be divided into constant voltage drive chip, constant current drive chip and pulse driver chip. Among them, constant voltage drive chip is generally our most common DC/DC boost chips. The advantage of this scheme is that chips are cheap and do not have complex peripheral circuits. But only constant voltage drive LED will drive the output current of the circuit is uncontrollable. LED brightness consistency cannot be guaranteed.
