| 摘要 |
PURPOSE:To almost eliminate the variation in the peak value of a regenerative current even if the voltage of a polyphase AC power source varies by comparing the voltage of the AC power source with the charged voltage of a capacitor as a DC power source. CONSTITUTION:The AC side of a bridged shaper 14 which has a plurality of diodes D7-D12 is connected through an insulating transformer 15 with a polyphase AC power source 3, and a smoothing condenser 16 is connected with the DC side. The output voltage of a voltage driving resistor 17 connected in parallel with the condenser 16 and the output voltage of a voltage dividing resistor 5 are added by an adder 6. When the differential voltage when the output voltage of the resistor 5 increases larger than the output voltage of the resistor 17 exceeds the Schmitt level of a hysteresis circuit 8, a recovery operation occurs, and when decreases lower than the Schmitt level, the recovery ends. |
