Power factor corrected UPS with improved connection of battery to neutral

  • US 6,069,412 A
  • Filed: 03/29/1993
  • Issued: 05/30/2000
  • Est. Priority Date: 03/29/1993
  • Status: Expired due to Term
First Claim
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1. An uninterrupted power supply (UPS), having first and second input terminals for connection to a power line source, one of said terminals being connected to power line neutral, first and second output terminals, one of said output terminals being connected to said neutral through an uninterrupted conductor, and a battery, comprisinga power factor correction (PFC) circuit having an AC to DC converter circuit, an input connected across said input terminals, and having a positive output terminal providing a positive DC high voltage with respect to said neutral and a negative output terminal providing a negative high DC voltage with respect to neutral,a high positive voltage rail connected to said positive output terminal and a negative high voltage rail connected to said negative output terminal,an output circuit having an input connected across said positive and negative rails, and providing an output to said output terminals, andbattery connection circuit means for connecting said battery to said PFC converter circuit so that when the power line voltage fails and said UPS is in battery mode operation, battery voltage is converted through said PFC converter circuit to supply said positive and negative high voltage rails.

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