ANTIPHASE CONTROLLER, AND ANTIPHASE ILLUMINATION CONTROL SYSTEM USING THE SAME

摘要

PPROBLEM TO BE SOLVED: To reduce the number of part items, to compactify a size and to reduce a cost, in an antiphase controller for illumination-controlling an illumination load, by antiphase-controlling an input voltage from an alternating current source. PSOLUTION: This antiphase controller 1 is provided with a rectifier 11 for full-wave rectifying the alternating current voltage V1; an n-type FET 12 interposed between the rectifier 11 and the illumination load 2, and for controlling the continuity of a current flowing in the illumination load 2; a zero-cross detecting part 13 for detecting zero crossing of the full-wave rectified voltage; a dimming control level setting part 14 for setting a dimmming control level of the illumination load 2; and a control part 15 for turning on and off the FET, at the timing of the zero cross, and for turning on and off the FET 12 at a fixed fringe angle, in response to the illumination control level. The illumination load 2 is thereby continuity-controlled in the antiphase control for the alternating current voltage V1 by the one switching element, and consequently, the number of part items is reduced to make the size small and to reduce the cost. PCOPYRIGHT: (C)2010,JPO&INPIT