Patent ID: 7855472
Filing Date: 2010-12-21
Classification: H02J

Abstract:
1. An uninterruptible power supply for providing power to a load, the uninterruptible power supply comprising: an input to receive input power; an output to provide output power; a plurality of battery modules that provide backup power; a power circuit coupled to the input, coupled to the plurality of battery modules and coupled to the output to provide power derived from at least one of the input power and the backup power to the output; a controller; a return line coupled to the controller and coupled to each of the plurality of battery modules; and a first sense line coupled to the controller and coupled to each of the plurality of battery modules; wherein each respective battery module of the plurality of battery modules includes a voltage divider having an output to provide a variable output voltage that varies with a temperature of the respective battery module, the output of each respective battery module being coupled to the first sense line by a respective switch; and wherein the controller is configured to determine a highest temperature present in the plurality of battery modules based upon a value of the variable output voltage that is provided to the controller by the respective switch.