Abstract: Various embodiments of the present disclosure relate to a non-volatile memory device including a sense amplifier and an operation method thereof. The non-volatile memory device may include: a memory cell array comprising a plurality of memory cells; and the sense amplifier configured to read data of the plurality of memory cells and output the read data. The sense amplifier may include: a first stage sense amplifier configured to sense a voltage difference between a reference voltage and a voltage of a bit line connected to at least one memory cell among the plurality of memory cells, and perform a primary amplification of the sensed voltage difference; and a second stage sense amplifier configured to perform a secondary amplification of a first result of the primary amplification and output a second result of the secondary amplification.

Abstract: A negative voltage switching device includes a first switching circuit configured to transmit a first negative voltage, a second switching circuit configured to transmit a second negative voltage, and a switching selection circuit configured to select one of the first switching circuit or the second switching circuit for transmitting one of the first negative voltage and the second negative voltage to an output terminal.

Abstract: Disclosed therein is a double water-tight structure protecting device for an electric charging part of an electric facility. The double water-tight structure protecting device includes: an insulator (300) attached on the outer peripheral surface of the electric charging part of the electric facility; a first tube-shaped protective cover (100) located at an upper portion of the insulator (300) in such a way as to surround an outer face of the insulator (300); a first waterproof member (110) interposed between the insulator (300) and the first protective cover (100); and a second waterproof member (120) interposed between the insulator (300) and the first protective cover (100) and located between a lower end portion of the first waterproof member (110) and a lower end portion of the first protective cover (100).

Abstract: Disclosed therein is a double water-tight structure protecting device for an electric charging part of an electric facility. The double water-tight structure protecting device includes: an insulator (300) attached on the outer peripheral surface of the electric charging part of the electric facility; a first tube-shaped protective cover (100) located at an upper portion of the insulator (300) in such a way as to surround an outer face of the insulator (300); a first waterproof member (110) interposed between the insulator (300) and the first protective cover (100); and a second waterproof member (120) interposed between the insulator (300) and the first protective cover (100) and located between a lower end portion of the first water-proof member (110) and a lower end portion of the first protective cover (100).