LEAKAGE CURRENT DETECTION AND PROTECTION CIRCUIT FOR A POWER PLUG
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United States of America Patent
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N/A
Issued Date -
Mar 13, 2008
app pub date -
Jun 5, 2007
filing date -
Sep 12, 2006
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A leakage current detection and protection circuit in a power plug includes an SCR (silicon-controller rectifier), diodes, capacitor, resistors, and a solenoid with a plunger. The control gate of the SCR is connected via a resistor to a metal sheath L of the cord. The solenoid SOL, the SCR and a diode are connected in series and connected across the hot and neutral lines of the power line (either line or load side), forming an SCR conducting path. When wire for the hot, neutral or ground lines in the cord is exposed due to damage or aging, the sheath around the wires becomes live, forming a conducting circuit from the sheath, resistors and diodes to the hot or neutral lines. The voltage on the resistor causes the SCR to conduct, which energizes the solenoid to open a switch between the line side and load sides of the plug.
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