一个相当基础的电路(留作练习，不过并不难)处理控制电压并输出与电压成比例的恒流。
A fairly basic circuit (left as an exercise, but it's not difficult) can take the control voltage and output a constant current which is proportional to the voltage.
具有电压调节范围宽，电路简单，输出稳定，可靠性强，人机交互接口优良，应用范围广泛等特点。
And it has the features of wide range regulation of voltage, simple circuit, output stability, reliability, excellent interactive interface, being widely used and so on.
通过简单分析该主电路的结构形式和工作原理，证明它是一种对电网污染少、整流输出电压特性好的焊接电源主电路形式。
By analyzing its structure and working principle, it proves that the new circuit has little pollution to the network and has well characteristic of the output voltage.
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