Why use wide voltage pulse modulator circuit for LED
When LED is used for lighting, there is a strict working current limit. If the limit is exceeded, the LED device will be burned due to overcurrent, and the light output will be greatly reduced due to undercurrent, reducing efficiency. Therefore, the LED needs to be powered by a constant current circuit. The requirement for the constant current circuit is that the input voltage can be changed in a wide range, while the output current is constant. There are many technologies that can achieve this requirement, but there are not many that can be achieved economically and efficiently. Pulse pulse width modulation technology is one of the best, so LED lighting circuits mostly use wide voltage pulse modulation circuits.
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