AC voltage protection circuit
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United States of America Patent
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-
Nov 9, 2004
Grant Date -
N/A
app pub date -
May 15, 2001
filing date -
May 15, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An over-voltage protection circuit for protecting against excessive voltages on the power line, neutral line and ground line. A voltage detection circuit is coupled and monitors the interterminal voltages between the power, neutral and ground lines. A switch circuit, coupled between the power line and load, provides an electrical current path between the power line and load when the voltage detection circuit detects that all of the interterminal voltages are less than a predetermined maximum voltage and the interterminal voltage between the power and neutral line terminals is greater than a predetermined minimum voltage. The switch circuit interrupts this electrical current path when the voltage detection circuit detects that any of the to interterminal voltages is greater than the predetermined maximum voltage. The switch circuit also interrupts this electrical current path when the voltage detection circuit further detects that the interterminal voltage between the power and neutral line terminals is less than the predetermined minimum voltage.
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