Over-voltage prevention device and current rectifying circuit
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United States of America Patent
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Jan 17, 2017
Grant Date -
Jul 30, 2015
app pub date -
Jan 26, 2015
filing date -
Jan 27, 2014
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Abstract
According to one embodiment, an over-voltage prevention device includes a first short-circuit device provided between a secondary side of a wound-rotor induction machine and a frequency converter configured to excite the secondary side by a three-phase AC current and having a function of short-circuiting between phases of the three-phase AC current, resistors each connected between the first short-circuit device and the frequency converter for each phase, and second short-circuit devices connected respectively to the resistors in parallel and having a function of short-circuiting between the frequency converter and the secondary side of the wound-rotor induction machine.
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