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Uninterruptible power supply system

  • US 4,728,808 A
  • Filed: 03/10/1986
  • Issued: 03/01/1988
  • Est. Priority Date: 03/13/1985
  • Status: Expired due to Fees
First Claim
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1. An uninterruptible power supply system comprising input terminals connectable to an AC power source and leading to an AC to DC converter for producing a first DC voltage source, a second DC voltage source operationally connected to said first source, said system supplying at the output of said source a preset voltage normally primarily provided by said first DC source, a capacitive accumulator means connected in parallel with a voltage sensing and controlling circuit and the output of said two DC sources, said sensing and controlling circuit sensing the output of said first DC voltage source and controls the output of at least the second of said DC voltage sources, the arrangement being such that when the voltage of said first DC voltage source deviates from a predetermined value, the difference between said preset voltage of the system and the voltage supplied by said first DC voltage source is provided by said accumulator means until said second DC voltage source supplies said difference.

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