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充电机一般都是把市电经变压、整流后对蓄电池进行充电。其基本电路如图1所示。由于用电情况不同,市电电压变化很大,在电压低的情况下充电电流很小,使蓄电池充电不足。在电压高的情况下充电电流很大,容易损坏蓄电池,影响其使用寿命。为克服市电变化的影响,防止电流过大的危害,一般在充电回路内串一定的电阻,其理由是:蓄电池在充电时其内阻很大。我们对6伏特M14、M12安时的蓄电池内阻进行过测量,其充电内阻在0.3～0.8欧姆之间。这样小的内阻在外电压升高的情况下其充电电流剧增。以升高一伏特为例,根据欧姆定律,电
Charging machine is generally the electricity by the transformer, the rectifier after charging the battery. The basic circuit shown in Figure 1. Due to different power conditions, mains voltage change is very large, in the case of low voltage charging current is small, so that battery charging is insufficient. In the case of high voltage charging current is large, easy to damage the battery, affecting its service life. To overcome the impact of changes in electricity to prevent the current over-large-scale damage, generally in the charging circuit string a certain resistance, the reason is: the battery when charging its resistance is large. We measured the battery internal resistance of 6 volt M14 and M12 amperes, and the charging resistance is between 0.3 and 0.8 ohm. Such a small internal resistance in the case of an increase in external voltage its charge current surge. To raise one volt, for example, according to Ohm’s law, electricity