| 摘要 |
PURPOSE:To manage a demagnetizing switch with a small current capacity, by connecting a diode in parallel with a thyristor of a switching element with a control terminal and flowing an attenuating oscillation current to a demagnetization coil. CONSTITUTION:A gate signal is applied to a gate of the thyristor 9 by turning on the demagnetizing switch 10a of a gate circuit 10, and the thyristor 9 is turned on. Charges in a capacitor 4 are discharged in the closed circuit of capacitors 4 thyristor 9 resistor 6 demagnetizing coil 6. The coil 5 is charged with this discharge current. When the discharge of the capacitor 4 is finished, the energy charged in the coil 5 with the discharge current of the capacitor 4 is discharged in the loop of demagnetizing coil 5 resistor 6 diode 8 capacitor 4. The capacitor 4 is charged with this discharge current. Through the repetition, an attenuating oscillation current flows to the coil 5. Thus, the switch 10a is managed with the small current capacity. |
