In addition to meeting the safety requirements, the LED drive Circuit should have two basic functions: first, keep the constant current characteristic as much as possible, especially when the power supply voltage changes by 15%, it should still be possible to keep the output current within 10%.
The main reasons are: 1. Avoid driving current exceeding * large rated value, affecting its reliability.
2. Obtain the expected brightness requirements and ensure the consistency of brightness and chromaticity of each LED.
Second, the drive circuit should keep its own power consumption low, so as to keep the system efficiency of LED at a high level.
The LED driving power supply converts the power supply into a specific voltage and current to drive the voltage converter for LED lighting. Generally, the input of the LED driving power supply includes high voltage power frequency AC (That is, mains)
, Low voltage DC, high voltage DC, low voltage high frequency AC (Such as the output of an electronic transformer)Wait.
However, the output of LED driving power supply is mostly a constant current source that can change the voltage with the change of LED forward voltage drop value.
The core components of LED power supply include switch controller, inductor, switch components (MOSfet)
, Feedback resistor, input filter, output filter, etc.
According to the requirements of different occasions, there are also input overvoltage protection circuit, input undervoltage protection circuit, LED open circuit protection, overcurrent protection and other circuits.
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