Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1990-03-09
1992-11-24
Stephan, Steven L.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
361 18, 361 89, H02H 304, H02H 320
Patent
active
051668548
ABSTRACT:
A power supply abnormality detection system of the present invention includes a low-frequency power amplifier circuit equipped with a built-in overvoltage protection circuit for detecting a voltage exceeding, for example, a reference power supply voltage. In accordance with the presence or absence of an overvoltage detected by the overvoltage protection circuit, a detection signal emerges from a detection output terminal provided outside the low-frequency power amplifier circuit. In accordance with that emerging detection signal, a counting circuit counts an overvoltage detection amount as pulses and, when the number of pulses exceeds a predetermined reference number, a power supply line relay section is operated so as to interrupt the supply of that overvoltage and an abnormality alarm device informs the generation of the overvoltage to an outside.
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Haszko D. R.
Kabushiki Kaisha Toshiba
Stephan Steven L.
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