| 摘要 |
PURPOSE:To make it possible to shorten start up time by forming a power supply generating circuit with a power circuit for drive circuit and that for voltage control circuit that produces D.C. power output between a second diode and a second capacitor. CONSTITUTION:A power supply circuit 18 for drive circuit consists of a diode D2 and a capacitor C2. A power circuit 19 for voltage control circuit consists of a second diode D4 and a second capacitor C5 with the capacitor C2 connected in parallel between the negative poles of the rectifying circuit 11 of a terminal section T1. The terminal section T2 between the diode D4 and the capacitor C5 is connected with the terminal Vcc of a voltage control circuit 13. When a power supply switch 2 is turned on, current 1 is fed through a resistor P1 connected with the positive pole of a rectifying circuit 11, and the capacitor C2 and the second capacitor C5 are simultaneously and gradually charged. When D.C. supply voltage Vcc2 for the voltage control circuit 13 exceeds the lower limit of operation voltage, ON-OFF control signal CNT output is produced. This makes it possible to significantly shorten start up time. |
