| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable parallel and synchronous operation of multiple inverters without adding a special signal line for start-up or overloading at start-up. <P>SOLUTION: One inverter IV1 is started at a value lower than its rated voltage, for example, 100 V, which is a voltage threshold value used when many load devices detect power supply. After a certain time passes, its voltage output is interrupted. The timing edge of the voltage output interruption is grasped with voltage detectors respectively provided in all the inverters IV1 and IV2, and the phase basis of output voltage is reset to a predetermined value. After a certain time passes, all the inverters are started to their rated voltage of 440 V according to the phase basis of output voltage of each inverter. Thus, the inverters is parallel and synchronously operated without adding a special signal line for start-up or overloading at start-up. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
