Cold-cathode fluorescent lamp lighting device

DETAILED DESCRIPTION In view of the foregoing, an object of this invention is to provide a cold-cathode fluorescent lamp lighting device which is able to light a cold-cathode fluorescent lamp in a highly efficient manner.
The foregoing object and other objects of the invention have been achieved by the provision of a cold-cathode fluorescent lamp lighting device which comprises: a voltage converting means for converting a direct-current voltage into an alternating voltage; a voltage transforming means for boosting the alternating voltage into the stated high-tension alternating voltage; and a change-over means for adjusting the step-up transformation ratio of the voltage transforming means against the alternating voltage and for changing the alternating voltage into a first high-tension alternating voltage and a second high-tension alternating voltage of which the second high-tension voltage value is lower than that of the first high-tension alternating voltage.
The change-over means changes the alternating voltage to the first high-tension alternating voltage when initially lighting the cold-cathode fluorescent lamp, and changes the alternating voltage to the second high-tension alternating voltage to maintain the lighting of the cold-cathode fluorescent lamp thereafter.
The direct-current voltage is converted into the alternating voltage by the voltage converting means, and the step-up transformation ratio of the voltage transforming means against the alternating voltage is adjusted by the change-over means when the alternating voltage is boosted into the stated high-tension alternating voltage by the voltage transforming means, wherein the alternating voltage is boosted into the first high-tension alternating voltage when lighting of the cold-cathode fluorescent lamp is to be started, and the alternating voltage is boosted into the second high-tension alternating voltage maintain the lighting of said cold-cathode fluorescent lamp.
Therefore, it is possible with a simple circuit to obtain the first high-tension alternating voltage and the second high-tension alternating voltage of the voltage values which are respectively needed, as minimum requirements, at the appropriate time to either start lighting the lamp or maintain lighting of the cold-cathode fluorescent lamp