What is the working principle of LED switching power supply?
The principle of switching power supply is to make the power transistor work under two working conditions: on-off and on-off. In other words, it is realized by chopping the amplitude of the input DC voltage into a pulse voltage equal to the amplitude of the input voltage. 

 

The working principle of switching power supply makes the voltage-ampere product added to power transistor very small (low voltage and high current in on state, high voltage and low current in off state), that is, the loss on power transistor is very small.

 

Switching power supply has two working modes: forward conversion and boost conversion. The circuit difference is small, but the working process is very different. It is suitable for different occasions and different requirements.