| 摘要 |
PROBLEM TO BE SOLVED: To keep the lighting of a lamp by controlling the lamp power while keeping the discharge of the lamp stable even when the voltage supplied from a battery to an automobile headlamp control circuit decreases extremely.SOLUTION: A discharge type lamp is driven stably against an input voltage fluctuation even during power source voltage fluctuation, by adding a circuit for detecting a power voltage fluctuation and a fluctuation of a direct current-rectangular wave conversion circuit and a circuit for feeding back these fluctuations to a power control circuit to a system including a power supply circuit, a power adjusting circuit, the direct current-rectangular wave conversion circuit, an igniter starting circuit, and a control circuit. |
