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Power supply device and power supplying method for power supply devicePower supply device and power supplying method for power supply device description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070210750, Power supply device and power supplying method for power supply device. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001]This application claims the benefit of Korean Application No. 2006-21727, filed Mar. 8, 2006 in the Korean Intellectual Property Office, and Korean Application No. 2006-63352, filed on Jul. 6, 2006, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein by reference. BACKGROUND OF THE INVENTION [0002]1. Field of the Invention [0003]Aspects of the present invention relate to a power supply device, and more particularly, to a power supply device for supplying power to an electronic device, and a power supplying method for the power supply device. [0004]2. Description of the Related Art [0005]In general, a portable electronic device obtains its operating power from an adapter connected to an external power source, from a built-in battery, or from an external power supply device (such as an external battery). [0006]A conventional external power supply device operates in either a charging mode or a discharging mode for bidirectional control. Specifically, the conventional external power supply device operates in the charging mode to charge an internal battery of the power supply when connected to an adapter. The conventional external power supply operates in the discharge mode to apply power from the charged internal battery to a portable electronic device when the conventional external power supply device is connected to the portable electronic device and is not connected to an adapter [0007]In such a conventional external power supply device, power for the charging or discharging mode is supplied through one terminal. A toggle switch is provided, and the charging or discharging mode is selected according to the setting of the toggle switch. In this case, however, it is inconvenient for a user, as the user has to switch the toggle switch every time to change the charging/discharging mode; moreover, there may arise a problem that an incorrect switch setting will cause the internal battery to be discharged even though the adapter is connected to an external power source. [0008]As described above, since the conventional external power supply device can operate only in either the charging mode or the discharging mode, power cannot be applied to the portable electronic device while the power supply charges the built-in battery. For this reason, it is impossible to connect a plurality of external power supply devices to the portable electronic device, as any external power supply device in the series that was charging would not supply power to the next power supply device in the series or to the portable electronic device. SUMMARY OF THE INVENTION [0009]An aspect of the present invention provides a power supply device, which is capable of applying power through an adapter to a portable electronic device or to a similarly configured power supply device, while charging an internal battery with the adapter power, and a power supplying method for the power supply device. [0010]Another aspect of the present invention provides a power supply device, which can be universally used for common portable electronic devices, and a power supplying method for the power supply device. [0011]Additional aspects and/or advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention. [0012]An aspect of the present invention includes a power supply device comprising a battery; a charging part to charge the battery; a power input part receiving adapter power from an adapter connected thereto; a power output part to output one of: the adapter power and the battery power of the battery; and a controller to control the adapter power to apply power to the charging part and the power output part when the adapter is connected to the power input part, and to control the battery to apply power to the power output part when the adapter is not connected to the power input part. [0013]According an aspect of the present invention, the power output part comprises a power output terminal having the same configuration as an the adapter connecting terminal of the adapter that connects to the power input part; and the power input part comprises a power input terminal the same configuration as an electronic device connecting terminal of an electronic device that receives either the adapter power or the power output through the power output part. [0014]According an aspect of the present invention, the controller comprises a first switching part to control the adapter power to be applied to the charging part and the power output part, and a second switching part to control the battery power to be applied to the power output part. [0015]According an aspect of the present invention, the first switching part comprises a first transistor interposed between the power input part and the power output part and turned on to apply the input power to the charging part and the power output part, and a first diode connected in parallel to the first transistor and having an anode connected to one end of the first transistor and a cathode connected to the other end of the first transistor; the second switching part comprises a second transistor interposed between the battery and the power output part and turned on to apply the battery power to the power output part, and a second diode connected in parallel to the second transistor and having an anode connected to one end of the second transistor and a cathode connected to the other end of the second transistor. [0016]According to an aspect of the present invention, when the adapter power is supplied through the power input part, the first switching part is switched on and the second switching part is switched off, so as to apply the adapter power to the charging part and to the power output part; and when the adapter power is not supplied through the power input part, the first switching part is switched off and the second switching part is switched on, so as to apply the battery power to the power output part. [0017]According to an aspect of the present invention, the controller further comprises a microcontroller that compares the voltage difference between the adapter power and the battery power with a predetermined reference value, and turns on one of the first transistor and the second transistor according to a result of the comparison. [0018]According to another aspect of the present invention, the controller further comprises a microcontroller that controls the first switching part to be switched on and the second switching part to be switched off, so as to apply the adapter power to the charging part and the power output part when the adapter power is supplied through the power input part; and controls the first switching part to be switched off and the second switching part to be switched on, so as to apply the battery power to the power output part when the adapter power is not supplied through the power input part. [0019]According to an aspect of the present invention, the power supply device further comprises a voltage regulator to regulate one of the adapter power and the battery power, which is output through the power output part, so as to have a predetermined output voltage level. [0020]According to an aspect of the present invention, the voltage regulator further comprises a buck/boost circuit placed ahead of the power output part to regulate one of the adapter power and the battery power applied to the power output part, so as to have the predetermined output voltage level, and to output the regulated power to the power output part. [0021]Another aspect of the present invention provides a power supplying method for a power supply device having a battery and a charging part charging the battery, the power supplying method comprising connecting the input of the power supply device to an external power source, either an adapter or a similarly configured power supply device; determining whether the input power is supplied to the power supply device; outputting the input power to an external electronic device or similarly configured power supply device, when the input power is supplied to the power supply device; and outputting the battery power of the battery to the external electronic device or to a similarly configured power supply device, when the input power is not supplied to the power supply device. Continue reading about Power supply device and power supplying method for power supply device... 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