Acquired current signal were inverse feed backed with PWM, then, output of the chip SG3525 were controlled through PI regulator. As a result, the external characteristic was controlled.

采用脉宽调制型控制方法，对采集到的电流信号进行负反馈，通过PI调节控制脉宽调制专用芯片sg3525的输出，以达到控制焊机外特性的目的。

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To weld high -frequency feed -through by AuSn brazing process, which is used to insure high -frequency impedance of in - put signal and out - put signal ;

采用金锡焊工艺钎焊高频引线组件，确保了信号输入输出端的高频阻抗要求；

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