Patent ID: 8723480

Claim:
An automatic charge equalization apparatus using a regulated voltage source, comprising: a battery module having a plurality of batteries connected in series; a battery string having M (natural number of M≧2) battery modules connected in series; a regulated voltage source which is provided for each battery module and outputs and maintains an average voltage of the battery string; a bidirectional switch block which is provided for each battery module between the battery module and the regulated voltage source to connect each battery to an output of the regulated voltage source by forming a parallel current moving path to each battery composing the battery module; and a microprocessor controlling the bidirectional switch block, wherein each battery composing the battery module shares the regulated voltage source by the bidirectional switch block and the microprocessor controls the bidirectional switch block to successively connect the batteries composing the battery module with the regulated voltage source, and wherein the bidirectional switch block comprises multiple bidirectional Metal Oxide Semiconductor Field Effect Transistor (MOSFET) switches, and Vgs applied upon turning on the MOSFETs composing the bidirectional MOSFET switch comes from two or more series-connected batteries which are one part of the battery string.