Ground-fault resistance measurement circuit and ground-fault detection circuit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 14, 2009
Grant Date -
Aug 2, 2007
app pub date -
Jan 30, 2007
filing date -
Jan 30, 2006
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
There is a ground-fault resistance measurement circuit which measures a ground-fault resistance between a conductive frame body of electrical equipment and a charge section insulated from the frame body. This ground-fault resistance measurement circuit includes: a capacitor which is connected between the charge section and the frame body; a switch which opens and closes a connection path between the charge section and the capacitor; a charging unit which charges the capacitor to a predetermined voltage; a voltage measurement section which measures a charging voltage of the capacitor; a discharge control section which connects the capacitor and the charge section after the capacitor is charged, and discharges the capacitor; and a calculation section which calculates a resistance between the charge section and the frame body, based on a change in the charging voltage of the capacitor.
First Claim
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