Samsung Electronics Co., Ltd.

Jong-myung Heo

Sung-kyu Choi

The present general inventive concept describes a switching mode power supply (SMPS) and a method of supplying power by using the same. An SMPS that may be used in an image forming apparatus can include a transformation unit to transform an alternating-current (AC) voltage input to the SMPS, into at least one direct-current (DC) voltage by using a transformer, a first output voltage output unit to output the transformed DC voltage as a first output voltage of the SMPS, a first switching unit to prevent output of the second output voltage, and a second switching unit to prevent output of the second output voltage.

Switching mode power supply of image forming apparatus and method of supplying power according to state of image forming apparatus by using the same

An LCD driving inverter to drive a plurality of lamps mounted in an LCD module, includes: a main substrate having an input part connected to an external power source, a conversion circuit converting a direct current provided from the input part into an alternating current, a first transformer connected to the conversion circuit to convert voltage from the conversion circuit and a first output part providing the voltage from the first transformer to at least one of a plurality of lamps; a subsidiary substrate including a second transformer connected to the conversion circuit to convert the voltage from the conversion circuit and a second output part providing the voltage from the second transformer to at least another one of the plurality of lamps; and at least one spacing member disposed between the main substrate and the subsidiary substrate so that the subsidiary substrate is mounted to be spaced from a surface of the main substrate. Thus, the LCD driving inverter and a portable computer including the inverter having a plurality of output parts is minimized in the width dimension.

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Yongin-si, South Korea

Jong-myung Heo