| 摘要 |
PURPOSE:To provide the electric power unit which can obtain a desired accurate output by subjecting plural power sources to associative operation. CONSTITUTION:The output current of a high voltage power source is detected by a resistance R3 and compared by an error amplifier 13 with a reference voltage at a terminal P4 from an unillustrated sequence controller. When the output of the error amplifier 13 is plus, the output is supplied to a power amplifier 16 through an error amplifier 15 and a diode D3 and a primary driving circuit 11 operates to supply a plus voltage to a load 18. At this time, the output of an error amplifier 14 is minus, so the output is cut off by a diode D4 and a power amplifier 17 does not operate. When the output of the error amplifier 13 is minus, a primary driving circuit 12 operates to supply a minus voltage to the load 18. An output current is controlled under feedback control to a desired in spite of the polarity of the output voltage. |
