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SHORT PROTECTION DEVICE FOR ALTERNATOR

  • US 20090168275A1
  • Filed: 06/12/2008
  • Published: 07/02/2009
  • Est. Priority Date: 12/28/2007
  • Status: Active Grant
First Claim
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1. A short circuit protection device installed in an alternator to control the field current produced by a field coil of said alternator, the short circuit protection device comprising:

  • a trigger switch electrically connected to said field coil and operated in such a manner that turning on/off said trigger switch corresponds to pass/cut-off said field current;

    a sensor having a current input node and a current output node respectively and electrically connected to said trigger switch and grounding potential, said sensor passing said field current when said trigger switch is turned on;

    a boost circuit comprising an input end and an output end, said input end being electrically connected to the current input node of said sensor;

    when the potential at said input end rises, the potential at said output end rises;

    when the potential at said input end drops, the potential at said output end remains unchanged; and

    a shutoff device comprising an upper conduction end, a lower conduction end, and a control end, which are respectively and electrically connected to said trigger switch, grounding potential, and the output end of said boost circuit, when the potential at said control end reaches a predetermined critical potential, said upper conduction end is conducted with said lower conduction end so as to turn off said trigger switch.

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