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Battery leakage current elimination in UPS units

  • US 9,166,423 B2
  • Filed: 08/17/2012
  • Issued: 10/20/2015
  • Est. Priority Date: 01/24/2012
  • Status: Active Grant
First Claim
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1. An uninterruptible power supply unit comprising:

  • a battery;

    a first MOSFET switch and a second MOSFET switch connected in series to the battery, and when the second MOSFET is in a fully on condition of a switching mode, the uninterruptible power supply unit is configured to provide power to a load;

    a controller for controlling charging of the batteries through the first MOSFET switch when the first MOSFET switch is in a linear operation mode and the uninterruptible power supply is connected to a power supply; and

    a first transistor arranged between the controller and the first MOSFET switch such that when the uninterruptible power supply unit is not connected to the external power supply, the first transistor reduces current leakage at the controller.

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