Abstract: A battery management system according to an exemplary embodiment of the present invention includes: a current measuring unit for sampling a charge current and a discharge current of a battery; a charge and discharge amount calculator for calculating a charge and discharge amount corresponding to a difference between the sampled charge current and the sampled discharge current; a polarization voltage calculator for calculating a polarization voltage corresponding to the charge and discharge amount and a temperature of the battery; and a pulse generator for applying a polarization voltage reset pulse for the battery to remove the polarization voltage.

Abstract: A grid-connected energy storage system capable of increasing the efficiency of a converter and a method of controlling the system are disclosed. In one aspect, the system includes a plurality of converters for converting power generated by each of the plurality of power generation modules into DC power at a voltage level, a plurality of series switches connected to the plurality of power generation modules, and a plurality of parallel switches configured to selectively connect each of the power generation modules to each and every other of the power generation modules. The system also includes a controller configured to control the switches in order to selectively connect each of the power generation modules to at least one selected converter.

Abstract: A battery management system according to an exemplary embodiment of the present invention includes: a current measuring unit for sampling a charge current and a discharge current of a battery; a charge and discharge amount calculator for calculating a charge and discharge amount corresponding to a difference between the sampled charge current and the sampled discharge current; a polarization voltage calculator for calculating a polarization voltage corresponding to the charge and discharge amount and a temperature of the battery; and a pulse generator for applying a polarization voltage reset pulse for the battery to remove the polarization voltage.

Abstract: A grid-connected energy storage system capable of increasing the efficiency of a converter and a method of controlling the system are disclosed. The grid-connected energy storage system can increase the efficiency of a converter by measuring generated power of a plurality of power generation modules and selectively operating the converter based on the measurements.

Abstract: A plasma display and a driving method thereof is provided. The plasma display includes a sustain electrode, a first switch coupling a first power source with a first voltage to the sustain electrode, a second switch coupling a second power source with a second voltage lower than the first voltage to the sustain electrode, an inductor, a power recovery capacitor, a third switch, and a fourth switch. The inductor is coupled to the sustain electrode. The power recovery capacitor is charged with a third voltage between the first and second voltages in a first subfield, and charged with a fourth voltage that is higher than the third voltage in a second subfield. The third and fourth switches couple the inductor to the power recovery capacitor, and are turned on in address periods of the first and second subfields to apply the third and fourth voltages, respectively, to the sustain electrode.