| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To secure sufficient compensation time even for wide temperature change of a capacitor, and to extend the service life of the capacitor. <P>SOLUTION: A momentary-voltage-drop compensation device uses an electric double-layer capacitor 5, which is kept in a charged state by a step-up/step-down chopper 6, as a back-up power supply, and supplies electric power from an inverter 4 to a load 2 by short-time rating, if a momentary voltage drop occurs to a power source 1. In this device, a temperature detector 9 detects the present temperature of the capacitor, a temperature-voltage converter 10 converts the temperature into a voltage signal corresponding to the temperature detection value, and a function generator 11 obtains a voltage set value that satisfies the compensation time of short-time rating specification according to the temperature detection value of the capacitor. A charging control device 8 controls the charging voltage of the capacitor according to the voltage set value. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
