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Power factor corrected UPS with improved connection of battery to neutral

  • US 6,944,035 B2
  • Filed: 03/03/2003
  • Issued: 09/13/2005
  • Est. Priority Date: 03/29/1993
  • Status: Expired due to Fees
First Claim
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1. An uninterrupted power supply (UPS), comprising:

  • first and second input terminals configured for connection to a power line source, the first input terminal configured for connection to a power line neutral;

    first and second output terminals, the first output terminal being configured for connection to the first input terminal through an uninterrupted conductor;

    a power factor correction (PFC) converter circuit configured to operate in an AC-powered mode as an AC to DC converter circuit, the PFC converter circuit having an input configured for connection to the first and second input terminals, a positive output terminal that produces a positive DC voltage, and a negative output terminal that produces a negative DC voltage;

    a positive voltage rail connected to the positive output terminal;

    a negative voltage rail connected to the negative output terminal;

    a DC to AC converter circuit that has an input connected across the positive and negative voltage rails and that provides an AC output at the first and second output terminals; and

    a connection circuit that connects a DC power source to the PFC converter circuit such that when the power line source fails and the UPS is in a DC-powered mode, voltage produced by the DC power source is converted through the PFC converter circuit to supply the positive and negative voltage rails.

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