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CIRCUIT FOR KEEPING THE FREQUENCY OF AN INVERTER SYNCHRONIZED WITH THE FREQUENCY OF ANOTHER SOURCE

  • US 3,614,461 A
  • Filed: 02/02/1970
  • Issued: 10/19/1971
  • Est. Priority Date: 08/11/1969
  • Status: Expired due to Term
First Claim
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1. In combination:

  • a. a set of electric power feeder lines adapted to be connected to a predetermined source of alternating voltage;

    b. a set of electric power load lines;

    c. an inverter having a DC input side and an AC output side, said output side being normally connected to said load lines to supply the same with alternating voltage;

    d. means for interconnecting said feeder lines and the input side of said inverter;

    e. means associated with said inverter for controlling the frequency of the alternating voltage Which is thereby supplied to said load lines;

    f. a synchronizing circuit coupled to both of said sets of lines for producing an error signal whose magnitude and polarity depend on the deviation in phase of the voltage supplied by said inverter from the voltage supplied by said predetermined source; and

    g. means for applying said error signal to said control means which consequently corrects the inverter frequency so as to minimize any phase deviation between said voltages.

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