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Three-phase detection module

  • US 8,724,275 B2
  • Filed: 01/30/2012
  • Issued: 05/13/2014
  • Est. Priority Date: 11/13/2007
  • Status: Active Grant
First Claim
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1. A method comprising:

  • receiving N power signals, each having a different one of N phases, over N power supply lines that supply power to a motor, wherein N is an integer greater than two;

    using a first isolator, selectively activating a first switch to allow a first current to flow from a first one of the N power supply lines to a second one of the N power supply lines;

    using a second isolator, generating a signal based on the first current; and

    selectively generating a phase failure signal when the signal is less than a predetermined threshold,wherein the first isolator includes a first optocoupler,wherein activating the first switch using the first isolator includes supplying current to a light emitter of the first optocoupler,wherein the second isolator includes a second optocoupler, andwherein generating the signal includes supplying a total current including the first current to a light emitter of the second optocoupler.

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