Patent ID: 7598711
Filing Date: 2009-10-06
Classification: H02J

Abstract:
1. A battery-switching apparatus for switching between at least a first battery and a second battery, comprising: a first battery compartment operative to house a first battery and having a first positive terminal and a first negative terminal; a second battery compartment operative to house a second battery and having a second positive terminal and a second negative terminal; a single boost converter connected to each of the first and second battery compartments; wherein the boost converter is operative to draw power from one of the first and second battery compartments having the highest voltage; a first capacitor, wherein the first capacitor is enabled when a voltage of the first battery exceeds a voltage of the second battery; and a second capacitor, wherein the second capacitor is enabled when a voltage of the second battery exceeds a voltage of the first battery; the first positive terminal of the first battery compartment is connected directly to a first common node; the second positive terminal of the second battery compartment is connected directly to the first common node; the first negative terminal of the first battery compartment is connected to a first input of a comparator through a second common node; and the second negative terminal of the second battery compartment is connected to a second input of the comparator through a third common node.