Abstract: An electronic part unit comprises an electronic part body which has a semiconductor chip and a plurality of external connection electrodes electrically connected to the semiconductor chip and in which the semiconductor chip is encapsulated such that the external connection electrodes remain exposed in a bottom surface of the electronic part body serving as a mounting surface opposed to the printed circuit board, and a cover member covering the electronic part body except for the mounting surface. The cover member has a shape defining a space which receives an adhesive around a side surface of the electronic part body to bond the electronic part body and the cover member to the printed circuit board.

Abstract: An electronic part unit comprises an electronic part body which has a semiconductor chip and a plurality of external connection electrodes electrically connected to the semiconductor chip and in which the semiconductor chip is encapsulated such that the external connection electrodes remain exposed in a bottom surface of the electronic part body serving as a mounting surface opposed to the printed circuit board, and a cover member covering the electronic part body except for the mounting surface. The cover member has a shape defining a space which receives an adhesive around a side surface of the electronic part body to bond the electronic part body and the cover member to the printed circuit board.

Abstract: A dv/dt protection circuit device for an AC-DC converter apparatus including control board switching arrangement having a current cut-off function which conducts an interrupts current from a power source to a load and refluxes the load current while the current is uninterrupted by a full-wave bridge rectifier circuit having a plurality of arms. Each arm of the bridge rectifier circuit connects a reactor for suppressing a rate of change of a power source line voltage of the bridge rectifier circuit at the switching time of the switching arrangement and a condenser is provided for absorbing an overvoltage generated at an inductance on the side of the power source, the condenser being connected on the side of the power source connected to the bridge rectifier circuit.

Abstract: In an elevator wherein an elevator cage is repeatedly run among a plurality of floors by controlling a cage driving motor in accordance with a velocity command; a floor arrival error involved when the elevator cage has arrived at the floor is detected, and the velocity command for the subsequent operation is corrected in accordance with the floor arrival error, thereby to enhance the floor arrival precision.