| 摘要 |
PROBLEM TO BE SOLVED: To provide a lamp system with a ballast which supplies a stable standard voltage without being affected by the temperature or the dispersion at a resistor manufacturing process, preventing a sharp alteration of the standard voltage when controlling the light, and enabled to perform the light control and on/off control by one terminal. SOLUTION: A ballast comprises a power source part supplying a lamp driving power, a half-bridge converter inputting the lamp driving power to lamp side, a lamp part emitting light by using a resonance circuit when the lamp driving power is inputted, and the ballast controlling a lamp driving current flowing through the lamp part. A standard voltage generating part of the ballast stably outputs the standard voltage regardless of the temperature or the dispersion at the resistor manufacturing process, moreover, reduces the impact added to the total lamp system, caused by an illuminance alteration of the lamp, generated by the time delay control of the driving current, flowing through the lamp in order to control the lamp illuminance. |
