How to make the switching power supply does not delay power
Use a relay to control the output of the switching power supply.
The relay directly to the circuit off, the big capacitor may be continued to flow about
If you want to add their own words at the same time chanting
Do not need to isolate the direct use of the input to control a switch when the input voltage is not the time to turn on the switch tube power output pull
If you need isolation with optocoupler to control the switch tube
