上海科技大学知识管理系统

本发明公开了一种磁通门电流传感器采样电阻纹波电流补偿方法，其特征在于，包括以下步骤：在当前采集周期，采集磁通门电流传感器电路中由自激振荡产生方波模块给出的激励信号引入的纹波噪声信号；利用模拟放大电路对纹波噪声信号进行放大处理；得到若干采集周期的放大后的纹波噪声信号，对采集到的若干采集周期的放大纹波噪声信号进行数字处理，转换为噪声抵消信号；将噪声抵消信号通过数模转换模块输入到磁通门电流传感器电路中，利用噪声抵消信号对磁通门电流传感器电路的纹波噪声进行抵消。根据对已有的样机进行测试得到的结果，本发明的纹波噪声抵消功能可以显著减小电流传感器中的纹波噪声，并表现出很好的稳定性。

The current sensor sampling resistor ripple current compensation method is characterized by comprising the following steps : in a current acquisition period, collecting ripple noise signals introduced by excitation signals generated by a square wave module in a magnetic flux gate current sensor circuit. The ripple noise signal is amplified by an analog amplification circuit. The amplified ripple noise signals of a plurality of acquisition periods are obtained, digital processing is carried out on the amplified ripple noise signals of a plurality of acquisition periods, and the noise cancellation signals are converted into noise cancellation signals. The noise cancellation signal is input into the magnetic flux gate current sensor circuit through a digital-to-analog conversion module, and ripple noise of the magnetic flux gate current sensor circuit is counteracted by the noise cancellation signal. The ripple noise cancellation function of the present invention can significantly reduce ripple noise in the current sensor and exhibit good stability according to the result obtained by testing the existing prototype.