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US 5,206,801 AGranted
AC/DC converter fault detector
OwnerJohn R. Flick, Cecil W. Simsinventors
Life of this patent
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Abstract
A system is disclosed including an AC sensor for providing an AC sensor signal based upon AC on AC lines, a DC sensor for providing a DC sensor signal based upon DC, and a fault detector for providing a fault indicating signal based upon a difference between the AC sensor signal and the DC sensor signal.
Claims18
A system for detecting faults comprising:
- AC lines for carrying AC;
- converting means for converting said AC into DC, said converting means having input means connected to said AC lines for receiving said AC and having an output DC lines for carrying said DC;
- first means coupled to said AC lines for providing a first voltage dependent upon said AC;
- second means coupled to said output DC lines of said converting means for providing a second voltage dependent upon said DC;
- and
- comparing means for comparing said first and second voltages, for providing a non-fault signal when said first and second voltages are substantially equal, and for providing a fault signal when said first and second voltages are not substantially equal.
3 more elements
A system for detecting faults represented by a difference between a first DC voltage representing an AC signal and as second DC voltage representing a DC signal, said system comprising:
- AC lines for carrying said AC signal;
- DC lines for carrying said DC signal;
- first means coupled to said AC lines for providing said first DC voltage based upon said AC signal;
- second sensing means coupled to said DC lines for providing said second DC voltage based upon said DC signal;
- and
- fault detecting means coupled to said first sensing means and to said second sensing means for providing a fault signal when said first and second DC voltages are not substantially equal and for providing a non-fault signal when said first and second DC voltages are substantially equal.
3 more elements
A system for converting AC into DC and for detecting faults comprising:
- converter means having an input for receiving AC and an output for supplying DC, said converter means for converting said AC into said DC;
- first sensing means coupled to said input of said converting means for providing an AC sensor signal based upon said AC, said AC sensor signal having positive and negative values;
- first difference means coupled to said first sensing means for providing a first difference signal based upon a difference between said positive and negative values of said AC sensor signal;
- second sensing means coupled to said output of said converting means for providing a DC sensor signal based upon said DC, said DC sensor signal having positive and negative values;
- second difference means coupled to said second sensing means for providing a second difference signal based upon a difference between said positive and negative values of said DC sensor signal;
- and
- third difference means coupled to said first and second difference means for providing a fault indicating signal based upon a difference between said first and second difference signals.
4 more elements
Dependencies are inferred from the claim text.