Would like to ask the switch power supply in the end is what role?
Open on the electricity, turn off no electricity, and then fine that is open after the internal power supply channel can work.
Switching power supply is used to control the switch through the circuit for high-speed pass and cut off. The conversion of direct current into high-frequency alternating current is provided to the transformer for transformer, resulting in the required group or groups of voltages! The reason for the high frequency AC is that the high frequency AC is much more efficient than the 50HZ in the transformer transformer circuit. So the switch transformer can be done very small, and the work is not very hot! The The cost is very low. If not 50Hz into high frequency switching power supply does not make sense! The Switching transformers are not mysterious. Is an ordinary transformer! This is the switching power supply. Switching power supply can be divided into two kinds of isolation and non-isolation, isolation must have a switching transformer, rather than isolation may not necessarily have.
Switching power supply is the principle of alternating current frequency into DC, and then convert DC into high frequency AC, through the switching transformer, feedback regulator and other processes into the voltage you need, through rectification, filtering, and then converted into DC The process, and MOSFET throughout the process through its continuous opening and closing, so that high-voltage DC into high-frequency AC process.
