Patent ID: 7724552

Claim:
A power supply to be connected in parallel to one or more other power supplies so as to share with the other power supplies in supplying load current to a load, the power supply comprising: a current detection amplifier configured to detect the load current supplied by the power supply and output a signal indicating the load current supplied by the power supply; a differential amplifier having a first input terminal and a second input terminal, wherein the first input terminal is connected to a first input terminal of a respective differential amplifier of each of the other power supplies, the signal output by the current detection amplifier is input to the second input terminal of the differential amplifier, and the differential amplifier outputs a signal indicating a difference in level between a signal input to the first input terminal and the signal indicating the load current input to the second input terminal; a first non-directional impedance element connecting the second input terminal of the differential amplifier to ground; and a second non-directional impedance element connecting the first input terminal of the differential amplifier and the second input terminal of the differential amplifier.