A switch power supply with standby function is disclosed. The power supply
can satisfy the need of the green environment protection. And a single
ended green switch power supply IC or thick film or modular circuit
design with standby function is disclosed, too. It comprises a standby
power supply, a main power supply, a PFC device, and a supplemental
circuit, wherein a remote control signal is transmitted to main control
circuit in response to a main error signal to control main power supply.
A method for preventing switch power current from overload and saturation
is disclosed too. Finally, the present invention also provides a green
power supply with standby function as well as its IC associated with
digital processing highly qualified PFC, and a PC standard (such as ATX,
ATX12, SSI) computer switch power supply.