| 摘要 |
PURPOSE:To make a discharge lamp possible to start up more speedier and steadier, by connecting in parallel with a starting circuit a pulse voltage control circuit consisting of a resistance and a switching element operated with such voltage as lower than starting voltage of the discharge lamp on the one hand and as higher than secondary no-load voltage of a ballast on the other hand. CONSTITUTION:A pulse voltage control circuit 19 consisting of a resistance 18 and a switching element 17 operated with such voltage as lower than discharge lamp's starting voltage on the one hand and as higher than ballast's secondary no-load voltage on the other hand, besides carrying immediate movability to a high frequency, is connected in parallel with a luminous tube 13. A wave of pulse voltage produced by connecting the resistance 18 via the switching element 17 in parallel with a starting circuit 16 like this is low in its maximum value Vp put a saw tooth pulse pat (a) is very little and yet a fundamental wave part (b) comes to be like a damped oscillating waveform whereby the pulse width becomes expanded so that pulse energy results in making a much contribution to the start-up of a discharge lamp effectively. |
