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FLUORESCENT LAMP LIFE DETERMINING DEVICE, FLUORESCENT LAMP LIFE DETERMINING METHOD AND INVERTER DEVICE FOR FLUORESCENT LAMP
FLUORESCENT LAMP LIFE DETERMINING DEVICE, FLUORESCENT LAMP LIFE DETERMINING METHOD AND INVERTER DEVICE FOR FLUORESCENT LAMP
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机译:荧光灯寿命测定装置,荧光灯寿命测定方法及逆变器装置
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摘要
PROBLEM TO BE SOLVED: To provide a fluorescent lamp life determining device, a fluorescent lamp life determining method and an inverter device for the fluorescent lamp, by which a last stage of the fluorescent lamp life can be accurately determined. ;SOLUTION: When a switch SW3 is turned on, a series circuit of a choke coil L3 and an secondary winding n3 of an inverter transformer T1 is short- circuited by a diode bridge DB1, and tube current in a fluorescent lamp FL1 gradually increases. If a filament of the fluorescent lamp is deteriorated, the tube current slowly and gradually increases. Therefore, a time required for the tube current to exceed a designated value from when short-circuited by the diode bridge DB1 is measured by a timer 1, and it is detected by a life determining part 28 that the time exceeds the designated time, in order to determine a last stage of its life.;COPYRIGHT: (C)1999,JPO
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