Electricity: electrical systems and devices – Safety and protection of systems and devices – Reverse phase responsive
Reexamination Certificate
2005-12-09
2008-08-19
Sherry, Michael J (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Reverse phase responsive
Reexamination Certificate
active
07414820
ABSTRACT:
A protective apparatus for protecting electric device connected to an AC circuit from being damaged at a time of misconnection between a live line and a neutral line thereof. The protective apparatus includes a detector, a controller, and an alarm. The detector is connected between the neutral line and the earth line. The controller is connected between the live line and the neutral line and includes a DPDT switch. Two blades of the switch switchably connected to the electric device and the alarm. The detector includes a voltage grading circuit, a rectifier-filter, a detect circuit, and an isolating circuit. Once misconnection between the live line and the neutral line occurs, an abnormal voltage is transformed by the detector to a stable DC power output, which drives the controller to disconnect the device from the live line and the neutral line and activate the alarm.
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Hoang Ann T
Hon Hai Precision Industry Co. Ltd.
Morris Manning & Martin LLP
Sherry Michael J
Tingkang Xia, Esq. Tim
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