电动自行车，欠压保护程序源代码。当电池电压低于欠压保护VALUE时，减小输出，如果减小输出到一定程度时，还是低于欠压，关闭输出，并考虑电池的特性，作滞回。-Electric bicycles, under-voltage protection of source code. When the battery voltage drops below the undervoltage protection VALUE, the reduced output, if the reduced output to a certain degree, or less than the under-voltage, turn off the output, taking into account the characteristics of the battery for hysteresis.