输出电流不受供电电压波动的影响，实现了电路的恒流功能。
The output current is never influenced by power supply, realizing the invariableness of load current.
供电电路中电压尽可能避免大幅度波动等。
Besides, the voltage in the main supply can not have great fluctuation.
供电电路中电压尽可能避免大幅度波动等。
Besides, the voltage in the main supply can not have great fluctuation.
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