Abstract: An uninterruptible power supply is able to switch an operation mode between an on-line operation method and an off-line operation method for a wider range of commercial power supplies.

Abstract: An uninterruptible power supply is able to switch an operation mode between an on-line operation method and an off-line operation method for a wider range of commercial power supplies.

Abstract: A battery charger converter circuit is disclosed in which a half-bridge rectifier circuit formed from two diodes, a half-bridge circuit formed from two switching elements, and a series circuit formed from two capacitors are connected at either end, respectively, thereof in parallel to each other, a boosting reactor being provided at the AC side of the half-bridge rectifier circuit; a primary circuit of the converter, including a primary coil of a high-frequency transformer, connected between a common point of connection between the switching elements and a common point of connection between the two capacitors, and a control circuit for the two switching elements; and a secondary circuit of the converter, including the secondary coil of the high-frequency transformer, a full-bridge rectifier circuit connected in parallel to the secondary coil and a smoothing capacitor; a high-frequency power generated by the primary circuit of the converter being rectified by the secondary circuit and charged into cells.

Abstract: On recognizing first through P-th input patterns as first through P-th recognized patterns (P being greater than one) by using a plurality of reference patterns and a plurality of memorized indentifiers identifying the reference patterns, a processing circuit processes the first through the P-th input patterns into first through Q-th provisional patterns different from one another, where Q is not greater than the above-mentioned plurality. A calculating circuit calculates dissimilarity degrees had by the reference patterns relative to the first through the Q-th provisional patterns to select, with repetition allowed as selected patterns, the reference patterns which have the dissimilarity degrees less than a predetermined degree. The calculating circuit thereby selects R particular identifiers and S different identifiers from the memorized identifiers, where R plus S is not greater than P and is not less than the plurality.