Electricity: electrical systems and devices – Safety and protection of systems and devices – Transient responsive
Patent
1989-12-29
1992-06-02
DeBoer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Transient responsive
361388, 361399, H05K 720
Patent
active
051192667
ABSTRACT:
A protection circuit for use with an electromagnetic interference filter used in conjunction with a three phase power circuit operating at a particular line frequency includes three capacitors which are coupled to the output terminals of the electromagnetic interference filter. The electromagnetic interference filter and the power circuit have a resonant frequency which is substantially equal to the line frequency. The capacitors of the protection circuit have values which are selected to change the resonant frequency of the electromagnetic interference filter and power circuit such that the resonant frequency is not substantially equal to the line frequency. A protection circuit assembly for use with an electromagnetic interference filter includes a base plate, three ceramic capacitors, three heat conducting substrates, and a protective cover which is mounted on the base plate. The capacitors are mounted on the heat conducting substrates, and the substrates are mounted on the base plate.
REFERENCES:
patent: 3614539 (1971-10-01), Hallenbeck
patent: 3880493 (1975-04-01), Lockhart, Jr.
patent: 3881137 (1975-04-01), Thanawala
patent: 4209754 (1980-06-01), Shiki et al.
patent: 4668873 (1987-05-01), Ohba et al.
patent: 4808843 (1989-02-01), Hedin
patent: 4843513 (1989-06-01), Edris
patent: 4949220 (1990-08-01), Tashiro
Ail Systems, Inc. (subsidiary of Eaton Corp.)
Deboer Todd E.
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