| 摘要 |
PURPOSE:To stabilize the current of the magnet coil irrespective of the fluctuation of the voltage of a driving power source by turning a transistor ON and OFF by a pulse having a duty inversely proportional to the change in the voltage of the driving power source. CONSTITUTION:Supply of current to the magnet coil 1 is placed under ON-OFF control by driving transistors 2 and 3. A comparator performs control in such a manner that the duty of the pulse turning the driving transistor 3 ON and OFF falls when the voltage VD of the driving power source rises, while, on the contrary, the duty of the pulse turning the driving transistor 3 ON and OFF rises when the voltage VD of the driving power source falls. |
