Patent ID: 6262590
Filing Date: 2001-07-17
Classification: G01R

Abstract:
A supply voltage abnormal condition indicating device comprising:a multi-system power supply circuit including a plurality of power supplies each of which normally supplies an output voltage having a substantially constant nominal value;signal generating circuits which correspond to each of the power supplies of said power supply circuit, and generate output signals of repetitive frequencies corresponding to each of the power supplies of said power supply circuit;a detection indicating circuit to which said output signals of said signal generating circuits are selectively supplied; andcontrol circuits means connected between each of said power supplies of said power supply circuit and said detection indicating circuit, respectively, so that, when a certain power supply of said power supply circuit becomes abnormal in output voltage and the output voltage deviates from its nominal value, a signal of a repetitive frequency corresponding to an associated power supply is supplied to said detection indicating circuit from said signal generating circuit,wherein said detection indicating circuit is energized when any one of said output voltages deviates from its nominal value to indicate that an associated power supply is abnormal.