High-frequency signal injection based high voltage interlock
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United States of America Patent
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Oct 6, 2015
Grant Date -
Oct 17, 2013
app pub date -
Apr 16, 2012
filing date -
Apr 16, 2012
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Abstract
Systems, methods and apparatus are presented to determine high voltage cable connectivity between an inverter module and a remote electric machine. A high frequency (HF) interlock module can be configured to inject a high frequency excitation signal that can be superimposed on inverter drive signals. High frequency current components can be determined and used to determine connectivity status. The sum and difference of positive and negative sequence component values can be compared to predetermined limitations to detect one or more open phases. An example method can include enabling a HF detection strategy under predetermined conditions. In response to an open phase detection a fault flag can be set.
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