Patent ID: 7443053

Claim:
A control system of electric output mode for use on a stacked electronic power supply system, said stacked electronic power supply system having a circuit board to integrate a plurality of electronic power supply devices to output electricity, the circuit board comprising: a control circuit having a parallel power supply mode in which all of said electronic power supply devices are operational and a backup power supply mode in which at least one of said electronic power supply devices is not operational and the remaining electronic power supply devices are operational, and is connected to a user operated switch device external to the stacked power supply system which provides a first signal source and a second signal source corresponding respectively to the parallel power supply mode and the backup power supply mode to allow users to select an actuation signal output from the control circuit to determine whether the control circuit operates in the parallel power supply mode or the backup power supply mode, wherein the first signal source is a high potential signal, and the second signal source is a low potential signal; said control circuit being connected to an external electricity source initially without providing power to said electronic power supply devices, for selectively providing external electricity to said power supply devices only after a mode of the control circuit is selected by a user and if the parallel power supply is selected, confirming whether all power supply devices are connected; said control circuit being connected to an alarm device to display physical damage conditions of the power supply devices; said circuit board integrating an electrical output from said plurality of electronic power supply devices to output electricity.