Patent ID: 6977829

Claim:
A master-slave current distribution circuit for parallel power supplies, wherein said parallel power supplies comprise at least a first power supply and a second power supply, comprising: a voltage amplifier; a power converting unit having an input electrically connected to an output of said voltage amplifier, and having an output electrically connected to a load; a current detecting unit having an input electrically connected to said output of said power converting unit and said load; an equivalent diode having an input electrically connected to an output of said current detecting unit, and having an output electrically connected to said parallel power supplies; an adjustable amplifier having an inverting input electrically connected to said output of said current detecting unit and said input of said equivalent diode, and having a non-inverting input electrically connected to said output of said equivalent diode and said parallel connecting power supplies; an adding unit electrically connected to a non-inverting input of said voltage amplifier and an output of said adjustable amplifier; and an energy gap voltage modulating unit electrically connected between said output of said current detecting unit and said non-inverting input of said adjustable amplifier, wherein an energy gap voltage formed between said output of said current detecting unit and said non-inverting input of said adjustable amplifier is modulated by said energy gap voltage modulating unit so that an unstability formed from said first power supply and said second power supply under a light load is eliminated.