Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1998-01-20
1999-08-10
Do, Diep N.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324519, G01R 3112, G01R 2726
Patent
active
059364092
ABSTRACT:
A capacitor quality discrimination scheme capable of permitting accurate and reliable determination of whether or not a capacitor under inspection is acceptable in quality. To this end, a method for discriminating the quality of a capacitor based on the charge characteristic upon application of a DC voltage thereto includes determining a standardized selection value charge characteristic of the dielectric polarization component of the capacitor, and then quadratically approximating one of (i) the ratio of the capacitor's actual measured current value m(t) and its calculated current value j(t) as obtainable from the standardized selection value charge characteristic, (ii) the difference between m(t) and j(t), (iii) the difference between logarithmic values of m(t) and j(t), and (iv) a ratio of respective logarithmic values of m(t) and j(t). If the secondary coefficient of quadratic curve approximation formula is positive in polarity then the capacitor determined to be a defective product; otherwise, the capacitor is determined to be good.
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patent: 5828222 (1998-10-01), Chen
Do Diep N.
Murata Manufacturing Co. Ltd.
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