| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrolytic capacitor degradation diagnosis system and an electrolytic capacitor degradation diagnosis method for externally diagnosing degradation in an electrolytic capacitor built in a controller, without having to remove it from a circuit, and to quickly, efficiently and automatically diagnose a plurality of the electrolytic capacitors to be diagnosed in the controller. SOLUTION: An estimate equation is previously obtained from a relative relation between a dielectric tangent tanδs in a stand-alone state and a dielectric tangent tanδsm, in a state where a plurality of the electrolytic capacitors 2s with different dielectric tangents are respectively mounted on component circuits 3, and stored. A dielectric tangent tanδm of the to-be-diagnosed capacitor 2 is measured, in a state where it is mounted on the component circuit 3. A dielectric tangent tanδof the to-be-diagnosed electrolytic capacitor 2 in the stand-alone state is estimated from the measurement value and information for identifying the component circuit 3. The degree of degradation is diagnosed by comparing a previously-stored degradation determination value. COPYRIGHT: (C)2008,JPO&INPIT
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