Precharging apparatus and power converter
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United States of America Patent
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Oct 10, 2017
Grant Date -
Jul 14, 2016
app pub date -
Jan 14, 2015
filing date -
Jan 14, 2015
priority date (Note) -
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Abstract
Precharging systems and methods are presented for precharging a DC bus circuit in a power conversion system, in which precharging current is connected through a precharging resistance coupled between only a single AC input line and the DC bus circuit when the DC bus voltage is less than a non-zero threshold, and a controller individually activates controllable rectifier switching devices when the DC bus voltages greater than or equal to the threshold using DC gating or pulse width modulation to selectively provide a bypass path around the precharging resistance for normal load currents in the power conversion system.
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