| 摘要 |
PURPOSE:To shorten the release time of a moving core at the shut-off time of the external voltage by connecting a transistor in series with an electromagnetic coil on the d.c. side, connecting a Zener diode and a capacitor in parallel between the base and the collector of the transistor, and causing the capacitor to be charged with the inductance energy of the electromagnetic coil. CONSTITUTION:A coil 2 is disposed at the positive electrode on the d.c. output side, and an NPN transistor 10 is connected in series with this coil 2. One end of a resistor 8 is connected to the positive electrode side of the coil 2, one end of a Zener diode 11 provided in parallel with a capacitor 9 is connected to the negative electrode side of the coil 2, and the other end of the resistor 8 is connected to the base of the NPN transistor 10. With this, when the external switch is turned off, the release time of the moving core is shrotened by causing the capacitor 9 to be charged with the inductance energy of the electro- magnetic coil 2 thereby to turn off the transistor 10. |
