Abstract: A back cover for mobile terminals which protects the rear surface of a mobile terminal having a battery in the rear surface. The back cover includes: a cover body mounted to the rear surface of the mobile terminal; hooks formed on the edge of the cover body and locked to the rear surface of the mobile terminal; a terminal unit provided on a first surface of the cover body at a location corresponding to terminals of the mobile terminal; a pattern electrode unit provided on a second surface of the cover body and electrically connected to the terminal unit, the pattern electrode unit having an electrode that electrically connects the terminals of the mobile terminal to an outside charger; and a magnet placed in the cover body and magnetically connected to the outside charger.

Abstract: A switching mode power supply (SNIPS) includes a rectifying unit transforming AC power input from outside to DC power, a main transformer transforming and outputting the rectified DC power, a pulse width modulation control unit controlling output voltage by applying a pulse signal to a primary winding of the main transformer, and a feedback control unit controlling an output signal of the pulse width modulation control unit by detecting output voltage of the main transformer, including: a first state transform unit, including: a second photo diode; and a second photo transistor included between an AC power input unit and the pulse width modulation control unit to form a photo coupler with the second photo diode, and a second state transform unit, including: a comparator connected to a secondary winding of the main transformer to apply the output voltage and reference voltage to an inverting terminal and a noninverting terminal, and compare the output voltage with the reference voltage and output the voltage t

Abstract: The present invention relates to a portable apparatus combining a battery charger with an emergency power supply, including: a hand-held body; an AC input section, a battery section; a DC output section; an LED display section; and a control circuit section. Accordingly, the inventive portable apparatus combining a battery charger with an emergency power supply functions as an adapter for supplying electric power to an electronic device and a charger for charging a battery contained therein when being applied with an external power supply, and functions as an emergency power supply for supplying proper electric power to the electric device using a built-in charged battery when being not applied with the external electric power supply.

Abstract: There is provided a power supply for AC/DC and DC/DC conversion which receives the DC power supplied from airplanes, vehicles and vessels as well as normal AC power, and converts the power to DC power and supplies it to portable electronic products. The power supply for AC/DC and DC/DC conversion includes an AC input 10, a DC input 20, a switch 30 for selecting AC input power or DC input power, a DC output 40, and a circuit used for AC/DC and DC/DC conversion 100 which converts the power input from the AC input or the DC input to DC power having predetermined values of current and voltage, and a secondary side of a transformer (TL) for AC/DC conversion inside the circuit for conversion serves as an inductor for performing DC/DC conversion.

Abstract: The present invention relates to an universal power supply apparatus wherein the power suitable for various kinds of portable electronic devices having different shapes and voltages of power input terminals is selectively supplied, and a power supply apparatus wherein a supplied voltage can be changed with only selection of a tip suitable for a portable electronic device. The power supply apparatus of the present invention includes a main unit having an electronic circuit for converting a received voltage, a cable, and a tip having a select pin. According to the present invention, as a desired power supply voltage is automatically adjusted by selecting a proper tip according to a subject electronic device, a manufacture cost is reduced. Further, as the power supply apparatus of the present invention can be used for various kinds of portable electronic devices by exchanging a tip, its operation is very easy.

Abstract: An upgradable SMART (Self-Monitoring Analysis and Reporting Technology) battery pack capable of upgrading a SMART function thereof is provided, including a battery array, a host interface for supplying power to a host and performing a SMART communication therewith, a protection circuit for protecting battery cells in the battery array from overcurrent or overvoltage, a microprocessor for monitoring a current state of the battery array, calculating a battery capacity thereof and controlling the SMART communication with the host via the host interface, a nonvolatile memory for storing an operational program of the microprocessor and battery information, a signal processor for converting a level of a signal to be sent to the host via the host interface into a predetermined level that is desired by the host and processing the level-converted signal, and an input/output port for performing an interfacing operation between the host and the microprocessor to download a control program and data from the host.

Abstract: An external battery pack apparatus is provided for supplying to a power-supply voltage to a portable appliance, including an adapter having a power-supply terminal and output voltage setting terminals for programming an output voltage; a cable connected to the adapter; and a main body including a battery, a charging controller for charging the battery, and an output controller for performing a DC-to-DC conversion on a voltage charged in the battery, outputting the DC-to-DC converted voltage to the adapter via the cable, detecting a programming status of the adapter, and changing an output voltage in response to the detected programming status.

Abstract: A power supply for both alternating current (AC) and direct current (DC) which has an AC/DC converter and DC/DC converter detachably coupled with each other. The AC/DC converter is adapted to convert an AC input voltage into a DC signal, and the DC/DC converter is adapted to convert a DC input voltage into a DC signal. An output voltage selector is provided to obtain a DC output voltage appropriate to an associated device. The present power supply can be conveniently carried, supply power to an associated device regardless of AC and DC input voltages and select a level of an output DC voltage. Therefore, the present power supply can be used universally irrespective of the types of associated devices and manufacturers.