求翻译：恒流阶段采用电流PI反馈控制，通过改变占空比，从而控制开关管的通断，控制输出电流恒定在一定值，电流值可根据需要和电池特性选择，控制框图如图b是什么意思？

The constant current phase of the current pi feedback control, by changing the duty cycle to control the switch off, control the output current constant at a certain value, the current value according to the needs and characteristics of the battery, the control block diagram shown in Figure b

constant-current phase PI feedback control, change, and thus of empty than the control switch OFF, control output constant current to a certain value, current value can be based on needs and choose the features and the Box figure such as the B

The constant flow stage uses the electric current PI reaction control, through change dutyfactor, thus controls the switching valve the make-and-break, the control output current in certain value, the magnitude of current may according to need constantly with the battery characteristic choice, contr

Constant phase current PI feedback control by changing the duty to control switch-break, control of the output current constant at a certain value, current value can be selected according to needs and battery characteristics, control diagrams such as Figure b

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