Patent ID: 7928603

Claim:
A power supply system, having a plurality of rechargeable electric storage units, comprising: a power line formed to allow transfer of electric power between a load device and said power supply system; a plurality of voltage converting units provided between each of said plurality of electric storage units and said power line, each performing a voltage converting operation between the corresponding said electric storage unit and said power line, each of said plurality of voltage converting units executing said voltage converting operation in accordance with a control system including a history element outputting a control value determined dependent on a previous value of said control value; an operation mode selecting unit selecting, in response to a power request from said load device, an operation mode in which the voltage converting operation of at least one voltage converting unit included in said plurality of voltage converting units is suspended; and a voltage converting operation control unit controlling execution and suspension of the voltage converting operation of each of said plurality of voltage converting units based on a status value of corresponding one of said electric storage units, when said operation mode is selected; wherein said voltage converting operation control unit sets, when said voltage converting operation is to be resumed at the suspended voltage converting unit, a prescribed initial value determined independent from said control value stored in corresponding said history element before resumption, to corresponding said history element.