Patent ID: 7847432
Filing Date: 2010-12-07
Classification: B60L,H02J,H02M,Y02T

Abstract:
1. A power supply system having a plurality of power storage units each configured to be chargeable/dischargeable, comprising: a power line configured to allow supply/reception of electric power between a load device and said power supply system; a plurality of voltage conversion units provided between said plurality of power storage units and said power line, respectively, and each performing voltage conversion operation between corresponding said power storage unit and said power line; and a battery current value detection unit detecting a battery current value of each of said plurality of power storage units, at least one of said plurality of voltage conversion units having voltage conversion capability different from that of other of said plurality of voltage conversion units, each of said plurality of voltage conversion units being controlled by a control system including a first feedback unit performing said voltage conversion operation such that the battery current value of corresponding said power storage unit matches a reference current value, the control system includes a voltage feedforward unit causing a value based on a battery voltage value, taken between corresponding said power storage unit and said voltage conversion unit, and a reference voltage value to be reflected in an output of said first feedback unit, a control gain in said first feedback unit being determined such that time taken from when a standard reference value is applied to said first feedback unit to when a current value generated by said voltage conversion operation in corresponding said voltage conversion unit reaches a standard output value substantially matches time taken from when the standard reference value is applied to another said first feedback unit to when a current value generated by said voltage conversion operation in corresponding another said voltage conversion unit reaches the standard output value.