Abstract: This intelligent portable energy storage system interlinked with an uninterruptible power supply comprises: an uninterruptible power supply including a power input terminal to which power is input from an external power source and an output terminal with which a load device is coupled; a plurality of output ports for coupling the load device; a communication module for receiving external data; and an energy storage device including an analysis processor for learning and analyzing the external data received by the communication module and the power consumption patterns of a user, wherein, when a power supply cutoff time is detected through the learning and analysis by the analysis processor, the energy storage device is cut off from regular charging received from the uninterruptible power supply and supplies power to the load device.

Abstract: Provided is a portable energy storage system (P-ESS) including a wireless communication module for forming a local wireless network. The P-ESS provides wireless communication between terminals within the local wireless network formed by the wireless communication module. In doing so, the terminals within the local wireless network are allowed to communicate with each other in an area or situation where communication is disabled, so that users of the terminals can check each other's safety or location.

Abstract: Provided is an energy level conversion circuit for a portable energy storage apparatus, and includes a motherboard circuit to connect a plurality of sub-board circuits in series through female connectors, wherein the sub-board circuits receive input of direct current (DC) power, convert it to a preset energy level and output it, and the sub-board circuits connected or inserted into the motherboard circuit through the female connectors, and including a switching unit which is switched by a pair of switching pulses (P1, P2) applied from the motherboard circuit, so that when each switching transistor (Q1, Q2) is on/off, power transformed through a transformer is outputted through secondary side transformer tap connection terminals (T1, T2), wherein the sub-board circuits are connected in series through a female connector unit of the motherboard circuit, so that DC power whose energy level is converted as much as the number of the sub-board circuits is outputted through the motherboard circuit.