Electronic device and electronic device system

#This application claims the benefit of Korean Patent Application No. 2005-54519, filed Jun. 23, 2005, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.

#1. Field of the Invention

#Aspects of the invention relate to an electronic device and an electronic device system, and more particularly, to an electronic device and an electronic device system, which receives power from a first device and is capable of controlling the power of the first device and for itself.

#These and/or other aspects and advantages of the invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

#FIG. 1 is a control block diagram of an electronic device according to an embodiment of the invention;

#FIG. 2 is a circuit diagram of a power management unit of the electronic device of FIG. 1;

#Reference will now be made in detail to embodiments of the invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the invention by referring to the figures.

#As shown in FIG. 1, an electronic device 200 includes a power switching unit 250, a first power input unit 210, a second power input unit 220, a power converting unit 230 and a power management unit 240. The power switching unit 250 outputs a power switching signal PWR_LD according to a user's selection. In this regard, the power switching unit 250 can be achieved by a button or the like, which is provided in an external region of the electronic device 200 and to output the power switching signal PWR_LD according to the user's selection. Alternatively, the power switching unit 250 can be achieved by a remote control device including a remote controller and a wireless signal receiver 331 (FIG. 11) receiving a wireless signal from the remote controller and outputting the power switching signal PWR_LD corresponding to the wireless signal.

#The first power input unit 210 receives first power VDC from outside the electronic device 200. Further, the second power input unit 220 receives second power VSB from the outside of the electronic device 200. The first power VDC and the second power VSB are of direct current (DC) power and are different in a voltage level. For example, the first power VDC can be used as main power VDC to drive a plurality of electronic components 300 of the electronic device 200, and the second power VSB can be used as standby power VSB to drive a specific electronic component 300 of the electronic device 200, e.g., a microcomputer 330 (refer to FIG. 11), of which power is maintained even though the electronic device 200 is turned off. In the description herein, the first power VDC and the second power VSB are used as the main power VDC and the standby power VSB, respectively.