Abstract: An electronic device is provided which includes a power input unit including a first power input unit and a second power input unit, a switching unit including a first switching circuit connected with the first power input unit and a second switching circuit connected with the second power input unit, and a controller configured to receive selection information for selecting a power source to supply power to a load unit included in the electronic device of a first power source and a second power source, wherein the first power source and the second power source are connected with the first power input unit and the second power input unit, respectively, and control the switching unit to connect the first power source to the load unit according to the selection information.

Abstract: An electronic device is provided, which includes a user interface unit configured to receive an input of a user command, a controller configured to perform an operation according to the input user command and to control the user interface to display a screen according to the result of the operation, and a power supply configured to provide a power to the user interface and the controller, wherein the power supply includes a plurality of converters configured to supply the power to respective loads of the electronic device, and the plurality of converters output voltage values that correspond to levels of the respective loads connected thereto.

Abstract: An electronic device is provided which includes a power input unit including a first power input unit and a second power input unit, a switching unit including a first switching circuit connected with the first power input unit and a second switching circuit connected with the second power input unit, and a controller configured to receive selection information for selecting a power source to supply power to a load unit included in the electronic device of a first power source and a second power source, wherein the first power source and the second power source are connected with the first power input unit and the second power input unit, respectively, and control the switching unit to connect the first power source to the load unit according to the selection information.

Abstract: A computer system is provided. The computer system includes a device which operates according to a clock frequency, a battery unit, which comprises a plurality of battery cells, for supplying power to the device, a temperature sensor provided at a location outside of the battery unit for detecting a temperature of the battery cells, a current sensor coupled to the battery unit for detecting a value of a current supplied from the battery unit to the device, and a controller, which is coupled to the temperature sensor and the current sensor, configured to control the clock frequency of the device according to the detected temperature and the detected current value, wherein the controller is configured to decrease the clock frequency if the detected temperature is greater than a first reference value or if the detected current value is greater than a second reference value.

Abstract: An electronic device is provided. The electronic device includes a switch configured to selectively connect power supplied from a power adaptor connected to the electronic device, a system load configured to be included in the electronic device and to receive power from the power adaptor or a battery connected to the electronic device according to on/off of the switch, and a controller configured to turn off the switch when entering an emergency power mode in a state where the power adaptor is connected to the electronic device.

Abstract: A charging method and apparatus, the apparatus including: an adaptor to receive power from a predetermined power source and output a first voltage; a narrow voltage direct current (NVDC) charging unit to convert the first voltage into a second voltage, and supply power to a battery and a system terminal of a mobile device; and a control unit to control the NVDC charging unit to adjust a charging current to be supplied to the battery based on a state of the system terminal, wherein the second voltage is lower than the first voltage.

Abstract: A power supply device includes a battery, a charging part charging the battery, a power input to receive adapter power from an adapter supplied with external power or power output from a similarly configured power supply device, a power output part to output the adapter power, the power output of a similarly configured power supply device, or the battery power of the battery, and a controller to control the input power to apply power to the charging part and the power output part when the input power is supplied to the power input part, and to control the battery to apply power to the power output part when the input power is not supplied to the power input part. Thus, the power supply device is capable of applying power from an adapter to a portable electronic device while charging an internal battery with the adapter power.

Abstract: An electronic device is provided, which includes a user interface unit configured to receive an input of a user command, a controller configured to perform an operation according to the input user command and to control the user interface to display a screen according to the result of the operation, and a power supply configured to provide a power to the user interface and the controller, wherein the power supply includes a plurality of converters configured to supply the power to respective loads of the electronic device, and the plurality of converters output voltage values that correspond to levels of the respective loads connected thereto.

Abstract: A battery managing method and apparatus, and an electronic device using the method and apparatus, to manage a power consumption amount of a battery in the electronic device such that a user may use the electronic device for a desired time period. The power consumption of the battery in the electronic device is measured and the user is notified that the battery is being overly used based on the desired time period of the user such that the user may manage the battery consumption of the electronic device.

Abstract: A computer system includes a device which operates depending on a clock frequency; a battery unit which comprises a plurality of battery cells and supplies power to the device; a temperature sensor which senses temperature of the battery cells; and a controller which decreases the clock frequency if the sensed temperature is beyond a first preset critical point.

Abstract: A charging method and apparatus, the apparatus including: an adaptor to receive power from a predetermined power source and output a first voltage; a narrow voltage direct current (NVDC) charging unit to convert the first voltage into a second voltage, and supply power to a battery and a system terminal of a mobile device; and a control unit to control the NVDC charging unit to adjust a charging current to be supplied to the battery based on a state of the system terminal, wherein the second voltage is lower than the first voltage.

Abstract: A wireless communication apparatus includes: a wireless communication unit which performs wireless communication; a converter which converts an input voltage into an output voltage in a switched-mode to supply the output voltage to the wireless communication unit; and a frequency adjusting unit which adjusts a frequency of a high frequency noise caused by a parasitic component of the converter, if the converter is switched, to prevent the frequency of the high frequency noise from interfering with a frequency of the wireless communication performed by the wireless communication unit.

Abstract: A power supply device includes a battery, a charging part charging the battery, a power input to receive adapter power from an adapter supplied with external power or power output from a similarly configured power supply device, a power output part to output the adapter power, the power output of a similarly configured power supply device, or the battery power of the battery, and a controller to control the input power to apply power to the charging part and the power output part when the input power is supplied to the power input part, and to control the battery to apply power to the power output part when the input power is not supplied to the power input part. Thus, the power supply device is capable of applying power from an adapter to a portable electronic device while charging an internal battery with the adapter power.

Abstract: A computer includes a system unit which has a plurality of electronic components, a battery unit which supplies auxiliary electric power to the system unit, an adapter which receives a first alternating current (AC) electric power and outputs a second AC electric power; a rectifying unit which rectifies the second AC electric power and supplies a direct current (DC) electric power having a level higher than a minimum electric power level required to operate the system unit and lower than a charging electric power level required to charge the battery unit, to the system unit, a battery charging unit which charges the battery unit, and an electric power amplifying unit which amplifies the DC electric power that branches off from a point of an electric power supplying path between the rectifying unit and the system unit, and supplies a charging electric power to the battery charging unit.

Abstract: A computer system including the same, and a DC/DC conversion method. The DC/DC converter includes: a filter part receiving an input voltage and outputting an output voltage converted in level from the input voltage; a plurality of switching parts switching so that the input voltage is selectively supplied to the filter part, wherein the switching parts are connected in parallel to the filter part at a phase voltage terminal; and a controller sequentially controlling switching of the plurality of switching parts so that the output voltage reaches a predetermined target value.

Abstract: A computer system includes a device which operates depending on a clock frequency; a battery unit which comprises a plurality of battery cells and supplies power to the device; a temperature sensor which senses temperature of the battery cells; and a controller which decreases the clock frequency if the sensed temperature is beyond a first preset critical point.

Abstract: A wireless communication apparatus includes: a wireless communication unit which performs wireless communication; a converter which converts an input voltage into an output voltage in a switched-mode to supply the output voltage to the wireless communication unit; and a frequency adjusting unit which adjusts a frequency of a high frequency noise caused by a parasitic component of the converter, if the converter is switched, to prevent the frequency of the high frequency noise from interfering with a frequency of the wireless communication performed by the wireless communication unit.

Abstract: An electronic device having a main body with a system load and capable of supplying power bi-directionally through a port, and an operation method thereof, the electronic device including: a power control apparatus to recognize a connection of an external power source for supplying power to the system load, and to control a startup of the external power source and a distribution of the power supplied from the external power source.

Abstract: A computer system, including a converter to convert a level of an input voltage into a charging voltage and to output the charging voltage to a battery unit; a converter driving unit to output a driving signal to the converter so that the charging voltage outputted from the converter is able to reach a predetermined target value; and a controller to control the converter driving unit to alternate the driving signal between supplying the charging voltage and suspension of the charging voltage.

Abstract: A synchronous buck DC/DC converter to perform an improved switching operation by adjusting a variable resistor is provided. The synchronous buck DC/DC converter includes a switching unit for switching two PWM signals inverted with a dead time and outputting the PWM signals, a smoothing circuit for outputting DC power using a waveform output from the switching unit as an input, a variable resistor connected to the switching unit and adjusting a switching time of the waveform output from the switching unit, and a variable resistor controller for sensing a current from an output terminal of the smoothing circuit and setting the resistance of the variable resistor to a resistance corresponding to the sensed current.