×

Processes and devices for providing a load with an electric AC supply without discontinuity of the AC signal

  • US 4,510,401 A
  • Filed: 03/28/1983
  • Issued: 04/09/1985
  • Est. Priority Date: 09/17/1981
  • Status: Expired due to Fees
First Claim
Patent Images

1. A process for, in an electric power supply device delivering AC energy to a load without interruption and capable of being supplied by a main source and an auxiliary emergency source, switching the supply of the load from the main source to the auxiliary source, without discontinuity or frequency jump in the AC energy delivered to the load, when a failure (break) appears in the main source and reciprocally from the auxiliary source to the main source when said failure disappears, characterized in that it comprises the succession of the following steps:

  • the appearance of a failure of the main source is detected,the load is disconnected from the main source, said load then being supplied by the auxiliary source in a way known per se,disappearance of the failure of the main source is detected,the frequency of the AC energy supplied by the auxiliary source is caused to drift,said frequency of the auxiliary source and the frequency of the main source are compared,the moment when these two frequencies come into coincidence is detected,and, at the moment of this coincidence, the load is again connected to the main source and the supply of electric energy to the load from the auxiliary source is stopped.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×