| 摘要 |
PURPOSE:To suppress the ripple of the lamp current of a discharge lamp by the dispersion of the property of the switching element in the analog control circuit of a discharge lamp triggering circuit. CONSTITUTION:The switch control signal between a gate and a source is controlled by feeding the signal T2 between a drain and a source back to a PWM circuit 1, and counting data in the period of the signal T2, which becomes high during ON because of the variation of the characteristics of bipolar transistors, with slow clock, and also, counting data in the OFF period of the signal T2 with quick clock. |
