| 摘要 |
PROBLEM TO BE SOLVED: To reduce the magnetic force of a dynamo, lighten torque, and prevent troubles such as an electric shock and ignition caused by insulation failure by performing voltage step up necessary to light a fluorescent tube with a piezoelectric transformer. SOLUTION: In the lighting circuit of a fluorescent tube for bicycle illumination lighting with the output of a dynamo, A.C. output generated with a dynamo 11 is rectified with a rectifier circuit 12, converted to D.C voltage and output is adjusted with a DC/DC converter 13. A.C. voltage necessary for driving a piezoelectric transformer 15 is obtained with a frequency control circuit 14, and inputted to the piezoelectric transformer 15. Output voltage necessary for starting lighting and continuing lighting of a fluorescent tube 18 is obtained with the piezoelectric transformer 15. Preferably, impedance of the fluorescent tube 18 is detected, and the output of the frequency control circuit 14 is controlled. The consumption of electric power is reduced, and illuminate the same as that obtained running at high speed can be obtained even when running at low speed operation. |
