| 摘要 |
<P>PROBLEM TO BE SOLVED: To detect a power supply unit that initially has power failure occurrence and becomes a current value that lies outside the reference voltage, at operation of a power supply system. <P>SOLUTION: When a power supply unit 1-1 has power failure occurrence during operation, an output current report signal becomes a reference voltage or smaller and a power failure signal becomes active ("1"). A voltage comparison circuit 3-1-1, in a power control section 30, compares the output current report signal with the reference voltage and detects a reference voltage that is lower and outputs "1". The output of an AND circuit 3-2-1 becomes "1", and the internal value of an RS flip-flop 3-3-1 is set to "1". An encoder 32 encodes the output of the RS flip-flop 3-3-1 to an RS flip-flop 3-3-N, to output an abnormal unit displaying signal for indicating which among the power units 1-1 is abnormal, to the power units 1-N. A display section 40 offers a display, based on the abnormal unit displaying signal. <P>COPYRIGHT: (C)2008,JPO&INPIT |
