Magnetic energy recovery switch having protective circuit
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United States of America Patent
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Oct 25, 2011
Grant Date -
Feb 10, 2011
app pub date -
Feb 20, 2008
filing date -
Feb 20, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In order to protect Magnetic Energy Recovery Switch (MERS) against an overvoltage and an overcurrent a voltage detection unit is provided for detecting the capacitor voltage of the MERS and control means is provided to control so as to turn ON the switch of the discharge circuit connected in parallel with the capacitor to make the capacitor discharge the electric charge thereof when the output of the voltage detection unit exceeds a predetermined value. Moreover, a current detection unit is interposed between the AC power supply and the load for detecting the current flowing to the load, and the current limiting is carried out by making the duty ratio of the ON/OFF of the pulse of the gate control signals of the MERS switches smaller than 0.5, when the output of the current detection unit exceeds a predetermined value.
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