Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1989-04-28
1990-11-06
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324434, 324117H, G01R 3102
Patent
active
049689436
ABSTRACT:
The non-intrusive open battery bank detector circuit senses an alternating current component of the DC trickle charge carried by one of a pair of cables connected between the battery charger and the bank of batteries. The detector circuit includes a sensor that is disposed adjacent, but not physically around or electrically connected to, one of the cables. The sensor detects magnetic fields established around the cable. The output of the sensor is connected to a low-pass filter which passes signals consisting primarily of 60 and 120 hertz components. A pre-amplifier amplifies the passed signals. A ripple filter smoothes the pre-amplified signals and a comparator determines whether the smoothed signal is greater than a reference signal thereby signifying the presence of a DC trickle charge on the cable next to the sensor. A transistor switch has its control input connected to the output of the comparator and is triggered on when the output of the comparator is high. The output of the transistor switch is connected to a control coil of a relay switch such that when the transistor is turned on, current passes through the relay coil and closes a normally open contact in the relay. When that relay contact opens, i.e., when the transistor goes off, an alarm circuit is activated.
REFERENCES:
patent: 3890370 (1971-06-01), Fleischer
patent: 4198597 (1980-04-01), Sawyer
patent: 4296410 (1981-10-01), Higgs et al.
patent: 4401942 (1983-08-01), Renz
patent: 4419621 (1983-12-01), Becker et al.
patent: 4517511 (1985-05-01), Suto
patent: 4540935 (1985-09-01), Burkum et al.
Eisenzopf Reinhard J.
Mueller Robert W.
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