| 摘要 |
PURPOSE:To improve the energy supply rate and to reduce a ripple by charging an auxiliary capacitor by the secondary side voltage of a power transformer, and outputting it through a voltage shifting circuit. CONSTITUTION:A power source smoothing circuit is composed of a power transformer 101 which inputs the AC voltage of a commercial frequency to the primary side winding, a full-wave rectifier 102, a smoothing condenser 103 connected in parallel with a load, a voltage shifting circuit 104 for shifting the rectified output voltage, an auxiliary condenser 105 charged by the rectified voltages VB, BD through a breaking diode 106, a voltage monitor 107, and a switching circuit 108. Thus, the instantaneous values of the rectified voltages VB, VD are monitored by the monitor 107, and when it becomes the prescribed level or lower, the circuit 108 is closed to discharge the energy stored in the capacitor 105 through the circuit 104 to the load. Thus, the energy discharged from the condenser 103 can be reduced to decrease the variation in the output level. |
