Power supply system with variable supply voltage

#This application claims the priority benefit of Taiwan application serial no. 100118706, filed on May 27, 2011. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

#1. Field of the Disclosure

#The disclosure relates to a power supply technique. Particularly, the disclosure relates to a power supply system with a variable supply voltage.

#The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the disclosure and, together with the description, serve to explain the principles of the disclosure.

#FIG. 1 is a circuit block diagram of an existing power supply system.

#FIG. 2 is a circuit block diagram of a power supply system according to an embodiment of the disclosure.

#Reference will now be made in detail to the present preferred embodiments of the disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.

#In the following embodiments, when “A” device is referred to be “connected” or “coupled” to “B” device, the “A” device can be directly connected or coupled to the “B” device, or other devices probably exist there between. Comparatively, when the “A” device is referred to be “directly connected” or “directly coupled” to the “B” device, none other device exits there between.

#FIG. 2 is a circuit block diagram of a power supply system according to an embodiment of the disclosure. Referring to FIG. 2, the power supply system 200 includes a power adaptor 210, a battery unit CHBAT, a switching circuit 220, and a main equipment 250. The battery unit CHBAT can be coupled to the power adaptor 210, the switching circuit 220 and the main equipment 250. The switching circuit 220 can be coupled to the power converter 210 and the main equipment 250.