To Alvis Tang(Writer), please read the following comment from me.
1. The PWM controller have softstart function.
2. The inrush current should not enough to kill the rectifier.
3. Simple question, when AC is ZERO, relay OFF, AC is ON, what function will be first on ? Relay should not be that function.
The SMPS have 2 parts. Main and Standby PWM controller.
To enter a Green mode, say 0.1W - 1W standby power, most engineer will found a method to fully switch off the main PWM controller include the PFC controller to archieve the lower standby power.
But actually, the PFC + PWM + Standby controller should exceed 1W in standby power at total value.
How will they do? Simple adding a MOSFET or Relay to swich off the PFC, PWM parts.
Then they will pass the Green mode test....
PS: The PWM controller is ST UC3842, it should not a green mode PWM controller....