| 摘要 |
An active and passive synergic hybrid equalization circuit of a series storage battery pack. The active and passive synergic hybrid equalization circuit comprises an active equalization circuit, a passive equalization circuit and a control chip. When the battery pack is charged, the active equalization is firstly used to perform the first stage energy movement on a battery in a constant current charging stage; when the voltage of the battery is approximate to an overvoltage point, the charging current of the battery is decreased, the charging process is gradually switched into a constant voltage charging process, at this time, the active equalization is closed, the passive equalization is started, and the second stage energy movement is performed at the end of the charging process; on one hand, an influence of the active equalization on battery voltage sampling can be eliminated and interference generated by energy storage elements such as an inductor at a high-frequency switching signal can be eliminated; meanwhile, a charging overvoltage threshold can be controlled more precisely; and therefore, the capacities of the batteries can be kept consistent more precisely. The active and passive synergic hybrid equalization method and the equalization circuit make full use of the advantage of a single equalization mode, make up the deficiency of the single equalization mode, and achieve equalization efficiency optimization. |
