Test apparatus for detecting reverse insertion of a capacitor on

Details Test apparatus for detecting reverse insertion of a capacitor on Test apparatus for detecting reverse insertion of a capacitor on

1993-11-26

1995-09-12

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324678, 209574, G01R 2726

Patent

active

054500141

ABSTRACT:
An in-circuit test apparatus includes a constant voltage source that supplies constant voltages and a current amplification circuit that outputs a constant current based on the constant voltages. A switch transfers the constant current from the current amplification circuit to an inversion amplifier that inversion-amplifies the constant current transferred by the switch. Additionally, a relay circuit transfers the inversion-amplified signal to a test board having a capacitor inserted into the test board. The capacitor charges with the constant current transferred by the relay circuit for a predetermined time period. A voltage follower amplifies the charging voltages on the capacitor to prevent the charging voltage from being discharged due to an internal resistance of the capacitor. Further, a comparison circuit compares the charging voltage on the capacitor with a reference voltage to sense the capacitance of the capacitor and to sense reverse insertion of the capacitor. A buffer buffers an output signal from the comparison circuit and a microprocessor senses the capacitance and reverse insertion of the capacitor in response to an output signal from the buffer.

REFERENCES:
patent: 4728931 (1988-03-01), Linder et al.
patent: 4748401 (1988-05-01), Aldinger
patent: 4779040 (1988-10-01), Aldinger
patent: 5343157 (1994-08-01), Deschamps

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