VOLTAGE EQUALIZATION CIRCUIT

摘要

A voltage equalization circuit includes: a voltage detection unit (19) which detects a voltage at both ends of an accumulator (13); an average voltage detection unit (21) which detects an average voltage of the accumulator (13); a reference voltage decision unit (23) which decides a reference voltage so as to follow the average voltage when the average voltage increases and gradually reduce the average voltage when the average voltage decreases; comparison units (35) which compare the voltages at the both ends of the accumulator (13) to the reference voltage; and an accumulator voltage adjustment circuit (37) which changes the current flowing in the accumulator (13) in accordance with outputs of the comparison units (35). This increases the service life of the accumulation device without causing an excess voltage.