Patent ID: 8120204

Claim:
A load sharing device for load balancing among a plurality of power supply modules connected in parallel to a single load, said device comprising: a common voltage control signal output unit for generating a common voltage control signal from output voltages of the plurality of power supply modules and outputting the common voltage control signal to the plurality of power supply modules; and output voltage control units corresponding to the plurality of power supply modules, respectively, to detect output currents of the plurality of power supply modules and to control the output voltages of the plurality of power supply modules to be in a predetermined voltage range according to the common voltage control signal and the detected output currents, wherein the common voltage control signal output unit includes: a plurality of voltage controllers corresponding to the plurality of power supply modules, respectively, each of the voltage controllers comprising an adder for adding a reference voltage to the output voltage of the respective power supply module, and an amplifier for amplifying a signal outputted from the adder; a plurality of bus voltage signal output devices for amplifying outputs of the voltage controllers to generate and output bus voltage signals; a common voltage control signal generator for combining the bus voltage signals to generate the common voltage control signal; and a common bus that is mutually connectable to the plurality of power supply modules to output the common voltage control signal to the plurality of power supply modules.