INVERTER CIRCUIT FOR HOT-CATHODE FLUORESCENT LAMP LIGHTING DEVICE, AND HOT-CATHODE FLUORESCENT LAMP LIGHTING DEVICE USING THIS INVERTER CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a hot-cathode fluorescent lamp lighting device, which can maintain the same power consumption with the conventional case and which can improve the luminance of a fluorescent lamp without generating luminance grade in the fluorescent lamp and which can reduce the noise from wiring of the fluorescent lamp in the case of connecting two fluorescent lamps in series to each other, and its inverter circuit. SOLUTION: In an inverter circuit 2' for converting the direct current power source voltage of a hot-cathode fluorescent lamp lighting device to the alternating current voltage at a predetermined frequency and for applying the alternating current voltage to a fluorescent lamp 1, high-voltage transformers T1, T2 for discharge of lamp are connected in series to each other, and voltage output of one of the two high-voltage transformers T1, T2 is taken out as an opposite phase to the voltage output of the other transformer, and applied to the fluorescent lamp 1. Furthermore, capacitors Cb1, Cb2 having the nearly same capacity are interposed between an output side of each transformer of the inverter circuit 2' and electrodes of the hot-cathode fluorescent lamp 1 so as to discharge the hot-cathode fluorescent lamp 1.