| 摘要 |
PURPOSE:To smoothen the rise of a rush current of the input terminal of a converter by applying a potential via a delay circuit and a time constant circuit to the non-inverting input terminal of a voltage/pulse converter. CONSTITUTION:An error amplifier 1 compares the voltage error signal of a converter with a reference voltage 3 and applies the output and a triangular wave in a converter into a voltage/pulse width converter 4, which in turns oututs a pulse responsive to the output voltage of the converter to a terminal 6. A time constant circuit made of a resistor 10 and a capacitor 11 is provided at the output side of a time delay circuit 7 connected to the auxiliary power source of the converter, and is connected to the non-inverting input terminal of the converter 4 through a diode 13. Accordingly, after the converter 4 is risen to the operating state, thereby gradually rising the potential of the non-inverting input of the converter 4 by the operation of the voltage of the delay circuit 7 and the time constant circuit, thereby reducing the rush current of the converter. |
