一种充电设备，电性连接一车用发电机与一电瓶，充电设备包括一电力控制模块及一运算控制模块。运算控制模块包括一处理单元、一驱动单元及一相位侦测单元。相位侦测单元用以侦测车用发电机的相位信号。处理单元将相位信号分割规格化，以取得一规格化相位信号，以及处理单元计算出一默认电压与输出电压的一电压差值，处理单元根据规格化相位信号、电压差值及一前周期触发相位以进行运算，以取得一触发相位，且驱动单元根据触发信号以控制电力控制模块，以使电力控制模块转换车用发电机的交流电为一充电电流，并输出充电电流以对电瓶充电。

A charging device is electrically connected to a vehicle generator and a battery. The charging device comprises a power control module and a computer control module. The computer control module comprises a processing unit, a drive unit and a phase detection unit. The phase detection unit is for detecting a phase signal of the vehicle generator. The processing unit normalizes the phase signal to obtain a normalized phase signal. The processing unit calculates a voltage difference between a predetermined voltage and the output voltage. The processing unit calculates and obtains a trigger phase based on the normalized phase signal, the voltage difference and the trigger phase of last period. The drive unit according to a trigger signal drives the power control module that converts an AC of the vehicle generator to a charging current with charging the battery.