| 摘要 |
PROBLEM TO BE SOLVED: To prevent the breakage of a load element by an abrupt voltage rise or an abrupt current increase, by providing a circuit in which a switch, resistor, and the load element are connected in series with a DC power source and a capacitor is connected in parallel with the load element. SOLUTION: A power unit 1 is provided with a circuit in which a switch 12, a resistor 13, and a load element 14 are connected in series with a DC power source 11, and a capacitor 15 is connected in parallel with the load element 14. Therefore, when the switch 12 is closed, a transient current (charging current to the capacitor 15) flows and the voltage at both terminals of the capacitor 15 becomes 0 V. As the capacitor 15 is charged thereafter, the transient current gradually decreases. At the same time, the voltage at both terminals of the capacitor 15 gradually rises. Thus, an abrupt voltage rise is suppressed. Since the abrupt voltage rise is suppressed, an abrupt current increase is also suppressed. |
