| 摘要 |
PURPOSE:To secure good startup of a load current by installing a transformer with the primary coil connected to first switching means, second switching means for turning on/off the primary coil of the transformer and third switching means for turning on/off an inductive load connected to a secondary coil of the transformer. CONSTITUTION:One end of a primary coil of a transformer T1 is connected to the collector of a transistor TR2 of first switching means, and other end of this primary coil of the transformer T1 is connected to the collector of a transistor TR3 of second switching means. Moreover, one end of a secondary coil of the transformer T1 is connected to an inductive load L through a transistor TR4 and a diode D2 of third switching means, and the other end is grounded. When the inductive load L is not driven, the TR3 is turned on and the TR4 is turned off. When the inductive load L is driven, the TR3 is turned off, the TR4 is turned on and the load current flowing through the inductive load L is quickly increased. |
