| 摘要 |
<p>PROBLEM TO BE SOLVED: To ensure lighting during lighting failure of a fluorescent lamp, by providing control in which after power supply is started by opening a door of a refrigerator, lighting condition of the fluorescent lamp is detected by a lighting detecting part, and when no-lighting is judged, the lighting action is repeated. SOLUTION: A mirocomputer 20 detects opening of a door of a refrigerator to generate an output signal, a switch of a relay 24 is turned on through a driver IC22, voltage is impressed from an alternating current supply 1 through a stabilizer 3 to filaments 7, 8 of a fluorescent lamp 10 to be preheated. After preheating, a starter 5 is cut off, and counter electromotive force with high voltage through the stabilizer 3 turns the lamp on. In the fluorescent lamp lighting detecting device, voltage of the stabilizer 3 is detected by a transformer coil 21 after a lighting operation, is rectified by a diode 23, and is input to a photo-coupler 27. An optical transistor 26 detects luminescence of LED25 and then detects voltage of the stabilizer 3, and when it is judged not to be lightened, control of the microcomputer 20 repeats the above lighting action.</p> |
