Abstract: Disclosed herein is a data communication method and apparatus for transmitting and receiving data in the form of a square-wave signal having a specific amplitude using an AC power line between a transmitter and a receiver connected in a closed circuit by cutting an AC voltage waveform and loading the data on the AC voltage waveform.

Abstract: The present invention relates to a fluorescent lamp including: a body (110) having fixtures (120 and 120a) mounted at both end portions thereof so as to detachably mount a fluorescent light bulb (105) thereon; and a connecting means (130) mounted at both end portions of the body (110) so as to continuously interconnect a plurality of bodies to one another, thereby electrically connecting the bodies (110) to one another, wherein the connecting means (130) having a sliding terminal part (131) slidably coupled to the fixture (120) mounted at one side of the body (110) in such a manner as to be selectively protruded by a given length outwardly from the fixture (120) at the end portion thereof during forward and backward movements thereof, and a fixed terminal part (135) formed at the fixture (120a) mounted at the other side of the body (110) in such a manner as to be connected to the sliding terminal part (131) by inserting the sliding terminal part (131) thereto.

Abstract: Disclosed is a power supply apparatus using a half-bridge type driving circuit, which is intended for the purpose of the compensation of a power factor, the achievement of a low crest factor and the maintenance of a constant output.