Abstract: A power converting device includes a filter filtering an AC input voltage to generate a filtered voltage, a power factor corrector boosting the filtered voltage to generate a boosted voltage, and a step-down converter reducing the boosted voltage to generate a DC output voltage. The power factor corrector includes a capacitor, an inductor, two diodes and two switches. The inductor has a first terminal coupled to the filter, and a second terminal. The diodes are coupled in series across the capacitor. A common node between the diodes is coupled to the second terminal of the inductor. The switches are coupled in series across the capacitor. A voltage across one of the switches serves as the boosted voltage.

Abstract: An armrest mounting structure which includes a keyboard having a front side and a plurality of bottom retaining holes spaced along the front side, and an armrest having a back side abutted against the front side of the keyboard and a plurality of coupling devices disposed at the back side and respectively fastened to the retaining holes of the keyboard, wherein each of the coupling devices comprises two vertical slots disposed on the back side of the armrest, a downward springy wall portion formed in the back side of the armrest and defined between the two vertical slots, a substantially L-shaped extension arm portion having a fixed end extending from the downward springy wall portion and a free end, and an upright plug rod portion raised from free end of the L-shaped extension arm portion and fitted into one of the retaining holes of the keyboard.

Abstract: A keyboard for a computer includes a rubber pad having conductive rubber cones and a recessed portion, a key unit having keys respectively disposed above the rubber cones, an upper silver grating and a bottom silver grating and retained between a frame and the rubber pad and having projecting strips with respective electric contacts projecting into the recessed portion and in contact with a circuit board mounted within the recessed portion.