Apparatus to control multiple parallel batteries to share load current

摘要

Circuit apparatus for controlling a plurality of parallel connected batteries to equally share a common load is shown that includes an n parallel batteries connected to a common load element through a load current monitor that monitors the current through the load element, a battery current monitor for each battery, and a plurality of DC/DC converter circuits having outputs connected in series with each battery respectively. The load current output signal of the load current monitor is scaled down by 1/n, where n is the number of batteries, by a scale down amplifier circuit and distributed as a reference voltage to summing circuits where the scaled down load current is compared to the output of the battery current monitors. The outputs of the summing circuits are respectively connected as control signals to each of the DC/DC converters that are connected to each battery. Each DC/DC converter circuit adjusts it's output voltage to regulate the battery currents to I1 . . . In of each of the n batteries to be equal to the reference voltage from the load current monitor.