AN ADAPTIVE BATTERY CHARGING CIRCUIT

摘要

An adaptive battery charging circuit includes a power supply circuit (20), a control circuit (30) and a pulse charging circuit (40). The control circuit (30) comprises a single-chip microcomputer (IC5). The pulse charging circuit (40) includes multiple parallel charging branches. Each of the charging branches is controlled by one of individual pins of the single-chip microcomputer (IC5). The single-chip microcomputer (IC5) acquires a charging voltage signal and a charging current signal of each charging branch in real time from the pulse charging circuit (40) and a current sample circuit (60) and judges the type of a battery in each charging branch by comparing the charging voltage signal and the charging current signal with the predetermined reference data. The single-chip microcomputer (IC5) also computes the time-dependent change amount of the charging voltage signal and the charging current signal of each charging branch and the difference between the voltage during positive pulse and the voltage during zero pulse in order to judge a charging state of the battery in each charging branch and thereby corrects the charging curve of the battery and determine the charging stage. The single-chip microcomputer (IC5) also acquires the maximum charging voltage, voltage positive slope, voltage zero increment, voltage negative increment and battery capacity increment of the battery in each charging branch so as to judge a degree of full charging of the battery and determine whether or not to terminate charging.