Backup power control system

#This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No. 100140171 filed in Taiwan, R.O.C. on 2011/11/03, the entire contents of which are hereby incorporated by reference.

#1. Technical Field

#The present invention relates to a power control technology, and particularly to a backup power control system.

#The following accompanying drawings are a part of the specification of the present invention and show exemplary embodiments of the present invention. The principle of the present invention is described in combination with the accompanying drawings and specification.

#FIG. 1 is a schematic diagram of a backup power control system 100 according to an embodiment of the present invention;

#FIG. 2 is a circuit diagram of a control unit 150 according to an embodiment of the present invention;

#Reference may now be made to embodiments of the present invention in detail, and examples of the embodiments are described in the accompanying drawings. Additionally, wherever possible, in the drawings and detailed description an element/component with the same reference number represents the same or similar part.

#FIG. 1 is a schematic diagram of a backup power control system 100 according to an embodiment of the present invention. Please refer to FIG. 1, in which the backup power control system 100 includes a main power supply unit 110, a first negative feedback circuit unit 120, a standby power supply unit 130, a second negative feedback circuit unit 140, and a control unit 150. The main power supply unit 110 is suitable for outputting a main power PW, so as to supply power to a load Z1. The main power supply unit 110 may generate a stable main power PW by using an AC-to-DC supply unit. For example, the main power supply unit 110 may be an AC to 12 V supply unit, but the present invention is not limited thereto. The AC-to-DC supply unit is an electronic device well known by persons of ordinary skill in the art, and the details are not described here again.

#Output ends of the main power supply unit 110 have a positive end A1 and a negative end A2. When the main power PW is output, an output current flows from the positive end A1 to the load Z1, and then returns to the main power supply unit 110 through a current path flowing to the negative end A2, in which the current path flowing to the negative end A2 refers to a path via the first negative feedback circuit unit 120. The first negative feedback circuit unit 120 is coupled between the negative end A2 of the main power supply unit 110 and the load Z1. Moreover, the negative end A2 may be connected to a second grounding reference point GND2, and the load Z1 is coupled between the positive end A1 and a first grounding reference point GND1, in which the first grounding reference point GND1 is different from the second grounding reference point GND2.