| 摘要 |
PURPOSE:To delay the rise of regulated voltage and to prevent the overshoot, by differentiating the regulated voltage when a power supply is turned on and applying this output of differentiation to the input terminal of a control circuit that controls the phase angle of a control rectifying element. CONSTITUTION:In addition to an integration circuit for closed circuit stabilizing consisting of a resistance R4 and capacitor C2, a differentiating circuit consisting of a capacitor C3 and a resistance R5 that differentiates regulated voltage is provided to a constant voltage circuit using a control rectifying element SCR. A diode D6 and a resistance R6 are connected between caspacitors C2 and C3 to apply the output of differentiation to an input terminal 5 of a control circuit 6. No voltage is produced at the capacitors C2 and C3 when a power supply is applied, and the both-end voltage of the R5 is supplied to the circuit 6 through the D6 to decrease the phase angle of the SCR. Thus output terminals 3 and 4 control the voltage of 3 and 4 with the time constant of a differentiating circuit to completely prevent the overshoot. |
