Cathode ray tube protection system

摘要

A cathode ray tube protection system for protecting a cathode ray tube from maintenance of high voltage residual occurring when power is turned on or off or due to abnormal operation in a projection-type television is provided. The cathode ray tube protection system includes: a high voltage output unit for providing a high voltage used for driving a cathode ray tube; a high voltage variation detector for detecting a varied high voltage of the high voltage output unit; a cathode ray tube driver for providing a predetermined voltage for driving the cathode ray tube; a medium voltage power supply fuse short-circuit detector for detecting a short-circuit state of a medium voltage fuse based on an operation state of the cathode ray tube driver; and a pulse width modulation processor for generating a pulse width modulation signal for limiting output of the high voltage output unit depending on outputs of the high voltage variation detector and the medium voltage power supply fuse short-circuit detector when the medium voltage fuse short-circuits, regardless of the varied high voltage.