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Phase synchronization and control circuit

  • US 4,516,035 A
  • Filed: 08/22/1983
  • Issued: 05/07/1985
  • Est. Priority Date: 08/22/1983
  • Status: Expired due to Fees
First Claim
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1. In an uninterruptible power supply which includes a main source of A. C. signals and an inverter for supplying A. C. signals to a load upon failure of the main source, a circuit for generating control signals used in switching the main source and the inverter to supply A. C. signals to the load including:

  • means for sensing the voltage level of the A. C. signals of the main source;

    first means for comparing the voltage level of the A. C. signals to a zero voltage level for outputting a first control signal when a coincidence occurs;

    means connected to said comparing means for generating a plurality of clock signals in response to the outputting of said first control signal;

    counting means coupled to said signal generating means to output a count in response to receiving each of said clock signals;

    storage means coupled to said counting means for outputting data signals in response to receiving each of said counts;

    and means coupled to said storage means for converting said data to a referenced A. C. signal for use in detecting the failure of the main source to supply A. C. signals to the load.

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