| 摘要 |
PURPOSE: To operate a drive circuit normally by limiting the upper limit of a charging current by connecting a current limiter resistor in series to a diode and a drive power supply relevant to a charging circuit of a capacitor. CONSTITUTION: When a switching transistor Q2 is turned on, the potential of a capacitor C1 at the side connected to the base of said transistor is lowered to the earth potential GND, and the potential at the side connected to a diode D1 is raised by a DC power supply E, so that the capacitor C1 is charged through the charging circuit, DC power supply E → current limiter resistor R → diode D1 → capacitor C1. The current limiter resistor R is connected in series to a diode D1. Because of this, at the time of charging the capacitor C1, a current flows instantaneously through the charging circuit, the drive power supply E → current limiter resistor R → diode D1 → capacitor C1 but its peak is limited by the current limiter resistor R, so that a large instantaneous current will not flow as before through this circuit. |
