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No-break AC power supply

  • US 4,010,381 A
  • Filed: 04/24/1975
  • Issued: 03/01/1977
  • Est. Priority Date: 04/24/1975
  • Status: Expired due to Term
First Claim
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1. An uninterruptible power supply comprising a power transformer including a first primary winding, a second primary winding, and a secondary winding,signal sensing means coupled to said first primary winding and responsive to detect a signal amplitude below a desired normal amplitude threshold,generating means to generate a periodic power signal and being coupled to said second primary winding,power flow control means to selectively control power transfer from said first and second primary windings to said secondary winding includingfirst phase detection means to monitor a signal phase of said secondary winding,phase control means coupled to said first phase detection means and to said generating means and normally operative to align the phase of said periodic signal with said signal phase of said secondary winding,second phase detection means to monitor a signal phase of said first primary winding,said phase control means coupled to said second phase detection means and to said signal sensing means and operative in response to a signal amplitude below a desired normal amplitude detected by said signal sensing means to align the phase of said periodic signal with a signal of said first primary winding.

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