| 摘要 |
PURPOSE:To make ON-time of current frequency constant, regulate the length of OFF-time, and attain an efficient lighting. CONSTITUTION:The ON-time of current frequency is set by an ON-time standard circuit 1, and the OFF-time is set by an OFF-time standard circuit 2 to regulate the brightness of a neon tube 5. When a power source is inputted, the current of the frequency of the set ON/OFF-time is formed in a switching transistor circuit 3 to light the neon tube 5. The information from a waveform detecting amplifying circuit 31 and a distortion detecting circuit 32 is transmitted to an ON-time control circuit 6, the current is displayed by a current display circuit 33 from the waveform by the circuit 31, and the overcurrent information of the circuit 3 is detected by an overcurrent detecting circuit 34, and transmitted to the circuit 6. Further, the ON-time is regulated by the circuit 6 so that distortion and overcurrent are extinguished while the ON-time of the frequency of the current of the circuit 3 is comparatively detected by a comparing circuit 7, and the ON-time is set by the circuit 1. The OFF-time is regulated in this state by the OFF-time standard circtut 2, whereby the brightness of the tube 5 can be regulated. Thus, efficient lighting can be performed. |
