Fault protection system for a respiratory conduit heater element
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United States of America Patent
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N/A
Issued Date -
N/A
app pub date -
Nov 30, 2001
filing date -
Dec 23, 1998
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A fault protection circuit for a respiratory conduit heater element in a respirator humidification system is disclosed. The circuit includes a spark detector as well as overcurrent detector. Several variations are included for the spark detector including a two winding transformer, a centre tapped two winding transformer), and a high pass filtered inductor. A semiconductor switching configuration is also disclosed. Once the protection circuit detects a change in current over a certain level, or the average level raises above a threshold, then the current in the heater element is interrupted for a preset period.
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Family
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Cited Art Landscape
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