Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1997-09-19
1999-11-30
Jackson, Stephen W
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 45, 361115, H02H 300
Patent
active
059953489
ABSTRACT:
An electronic device placed in series with the probe ground-to-chassis connection. The device comprises a current-detecting element such as a resistor or RC network and may employ frequency-discriminating circuitry to limit only ground current signals below a certain frequency. The detector element triggers either a current limiter or a latching switch to prevent currents exceeding about 20 .mu.A rms from flowing between the probe and the patient. This is achieved by limiting such currents dynamically or by latching the transducer-probe-ground/system-chassis connection in an "open" state. In normal operation, the limiting/latching function is inactive, i.e. it is transparent to the system and the device shunts noise signals to the system chassis to prevent image degradation. The resistance of the device in normal operation may be in the range of about 0.1 to 10 ohms for effective noise reduction (shielding) at operating frequencies at and above 100 kHz. Preferably, the insertion resistance is about 2 ohms or less. Upon detection of an overcurrent event, the hardware may additionally be configured to notify the imaging system of the potential hazard. The imaging system may, in turn, display a warning message on its screen, and/or it may lock out further use of the system. The system may also be configured to reset the transducer-probe-ground/system-chassis connection and the current detector via software control after the single-fault condition abates.
REFERENCES:
patent: 3590322 (1971-06-01), Carr
patent: 4535759 (1985-08-01), Polk et al.
patent: 4546401 (1985-10-01), Svedberg
patent: 4744369 (1988-05-01), Kroll
patent: 4811156 (1989-03-01), Kroll
Lidgey David L.
Marshall John D.
McCartan Dermot
Acuson Corporation
Jackson Stephen W
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