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Uninterruptible power supplies

  • US 4,400,624 A
  • Filed: 04/29/1982
  • Issued: 08/23/1983
  • Est. Priority Date: 04/29/1982
  • Status: Expired due to Term
First Claim
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1. An uninterruptible power supply having first and second input means adapted to receive a primary and reserve energy source respectively, and output means for accepting a load to be energized,control means for determining acceptability of the primary energy source and operative for effecting a transfer of the load from the primary energy voltage source to the reserve energy source if the primary energy source is determined to be unacceptable, comprising;

  • central data processing means, memory means and interface means coupling the data processing means to connecting switches and signal sensors of the power supply,the memory means including a first instruction routine interacting with a first counter preset with a number for count down to establish a timed interval larger than a desirable half period of a primary AC voltage signal of the primary energy source, determining a remainder count value existing in the counter at the end of an actual half period of the primary AC voltage signal, and utilizing the remainder count value to compute pulse position of a comb pulse waveform generated so that individual pulse positions occur at preselected phase angles of the primary AC voltage signal;

    a second instruction routine responsive to individual pulses of the comb pulse waveform and operative for taking amplitude samples of the primary AC voltage signal and comparing it to amplitude values stored in memory to determine acceptability of a signal amplitude of the primary AC voltage signal and means for disconnecting the primary energy source in response to the second instruction routine.

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