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专利名称：Apparatus for detecting arcing and
overcurrents in dc electrical systems subjectto cyclic disturbances
发明人：Joseph C. Zuercher,Steven Christopher
Schmalz
申请号：US09939220申请日：20010824
公开号：US200300380A1公开日：20030227
专利附图：
摘要：Arcing in dc electrical systems subject to cyclic disturbances is detected by a
current sensor, and a bandpass filter sensitive to arcing noise, which filters the sensorcurrent. The absolute value of the bandpass filtered signal is integrated over repetitiveintervals in a resettable analog integrator. A low cost microprocessor samples and resetsthe analog integrator at a frequency below the pass band and generates a timeattenuated accumulation of the samples that produces an arcing signal if it reaches apredetermined limit. To improve nuisance immunity, the sensed dc current is compared ina high speed comparator to the average sensed dc current, and only samples taken bythe microprocessor during a predetermined time period after the sensed dc currentexceeds the average sensed dc current in a predetermined manner are accumulated. Theaverage sensed dc current is also used by the microprocessor to provide overloadprotection.
申请人：ZUERCHER JOSEPH C.,SCHMALZ STEVEN CHRISTOPHER
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