Electricity: electrical systems and devices – Safety and protection of systems and devices – Compressor protective circuits
Patent
1991-12-06
1994-02-08
DeBoer, Todd
Electricity: electrical systems and devices
Safety and protection of systems and devices
Compressor protective circuits
361 18, H02H 709
Patent
active
052853446
ABSTRACT:
An overvoltage protection device for protecting the electrical system of a vehicle against overvoltages, the vehicle having an on-board wiring network connected to an electrical generator and having electrical devices connected thereto, includes a controllable switch for effectively short-circuiting the generator in case of an overvoltage condition. The switch includes a switching transistor connected in parallel to the generator. Evaluation circuitry connected to receive the generator voltage is provided for issuing a first evaluation signal when a predetermined overvoltage threshold is exceeded and for issuing a second evaluation signal when the generator voltage subsequently falls below a predetermined low voltage threshold. A memory is provided for receiving the evaluation signals and for controlling the switching transistor. The memory stores one of the received evaluation signals until receipt of the other evaluation signal. Furthermore, during storage of the first evaluation signal, the memory controls the switching transistor to effectively short-circuit the generator and during storage of the second evaluation signal, controls the switching transistor to assume a switching condition not effectively short-circuiting the generator.
REFERENCES:
patent: 3488560 (1970-01-01), Konopa
patent: 4262243 (1981-04-01), Mori et al.
patent: 4268787 (1981-05-01), Sloan
patent: 4315204 (1982-02-01), Sievers et al.
patent: 5089766 (1992-02-01), Iwatani
"Uberspannungsschutz," pp. 22-25, No date.
"Technische Unterrichtung," Bosch, four pages, No date.
"Impressum," Drehstromgenerator, pp. 436 and 437, 1984.
DeBoer Todd
SGS-Thomson Microelectronics GmbH
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