Abstract: A technology of an electronic label showing information of products displayed in a store is disclosed. A system for searching for information of an electronic label according to an exemplary embodiment may include: a server; a repeater; and an electronic label that includes a communicator, storage, a display, and a controller. The server may receive a product search request message and transmit a product search result corresponding to the product search request message. The communicator may perform communications with the repeater. The controller may include an information searcher and an information display. The information searcher may generate a product search request message from information on a search request that a user has input and transmits the product search request message to the repeater. The information display may control the product search result to be displayed on the display.

Abstract: The present invention provides a power supply for a server including: a PFC (Power Factor Correction) unit for meeting harmonic regulation by being connected to an input power source; a DC/DC unit including a switching stage provided with at least one switching device to switch a voltage of a link capacitor as an output voltage of the PFC unit to a predetermined operation frequency and a DC/DC stage driven by the switching stage; a DC/DC control unit for controlling the DC/DC unit by being connected to the switching device; and a frequency varying circuit unit for supplying the DC/DC control unit with a frequency control signal to adjust the operation frequency of the switching device according to load after detecting an output current of the link capacitor and acquiring load information.