| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a drive circuit for an electromagnetic operation mechanism that protects a switch element for drive control from a voltage generated by an induced electromotive force. <P>SOLUTION: A drive circuit for an electromagnetic operation mechanism has: a closing circuit in which a closing drive coil 2 is connected to a closing capacitor 6 via a closing switch element 5, and closing overvoltage suppression means in which a resistor 9 and a switch element 10 are connected in series is connected in parallel to the closing drive coil 2, and a protection switch 7 is provided between the closing drive coil 2 and the closing switch element 5; and an opening circuit in which an opening drive coil 3 is connected to an opening capacitor 13 via an opening switch element 12, and opening overvoltage suppression means in which a resistor 15 and a switch element 16 are connected in series is connected in parallel to the opening drive coil 3. When the opening drive coil 3 is excited to generate an induced electromotive force at the closing drive coil 2 side, the protection switch 7 is open-circuited. <P>COPYRIGHT: (C)2013,JPO&INPIT |
