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Uninterruptible power supply with load regulation of standby voltage source

  • US 4,313,060 A
  • Filed: 02/15/1980
  • Issued: 01/26/1982
  • Est. Priority Date: 02/15/1980
  • Status: Expired due to Term
First Claim
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1. An uninterruptible power supply comprising;

  • input means (9) to accept an AC power source,a controlled ferroresonant regulator (10) coupled to the input means and energized by the AC power source, a rectifier (14) coupled to the ferroresonant regulator to derive a first rectified DC voltage therefrom, an inverter (20) energized by the first rectified DC voltage, output means to accept a load (28) energized by a second rectified DC voltage output of the inverter,characterized bya voltage sensor (27) coupled to sense a voltage of the load and to a ferro-control (25) to control the controlled ferroresonant regulator and regulate the second rectified DC voltage output of the inverter at a first magnitude level by controlling a DC voltage level of the first rectified DC voltage, a voltage regulation circuit (32) including second input means adapted to accept a reserve DC voltage source (16) and output means to couple it to the inverter, the voltage regulation circuit responding to the voltage sensor when the voltage level of the second rectified DC voltage output drops below the first magnitude level and operative to amplitude modulate and couple a voltage level supplied by the reserve DC voltage source to the inverter and control a DC voltage level of a voltage applied to the inverter level so that a third rectified DC voltage output of the inverter at the load is slightly lower in magnitude than the first magnitude level of the second rectified DC voltage output occurring at the load in response to the controlled ferroresonant regulator, whereby a failure in the primary power source enables the voltage regulator circuit to insure a continued DC voltage at the load.

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