| 摘要 |
PROBLEM TO BE SOLVED: To control a charging voltage of a capacitor constant at all times. SOLUTION: A power unit is configured such that: a plurality of circuits composed of variable resistors 4 and capacitors 5 are connected in parallel; each capacitor charges the corresponding resistor by using a commercial power supply voltage; and a discharging current is made to flow to a load from each capacitor successively. The power unit comprises: an impedance control means 7-11 that controls the impedance of the variable resistor having a prescribed target value that allows an input current to flow to an arbitrary one of the capacitors; and an amplitude control means 7-12 that controls the amplitude of the input voltage of the target value to be made larger when the capacitor voltage drops below the target value of the charging voltage, and controls the amplitude of the input voltage of the target value to be made smaller when the capacitor voltage rises exceeding the target value of the charging voltage. COPYRIGHT: (C)2003,JPO
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