一种基于数字积分方法的板卡电流在线监测系统

Online Current Monitoring System Based on Digital Integration Method for Board Card

板卡运行电流的监测对评估板卡的运行状态有重要意义。文中提出了一种板卡电流在线监测方法,设计了一种可以方便开合的开合式线圈作为电流传感器,包含两个线圈。两个线圈骨架的结构和尺寸相同,但匝数不一样,匝数少的用于实现较大电流的测量;匝数多的用于实现微弱电流的测量。通过两个线圈的配合,实现较大动态范围内电流的准确测量。线圈输出需要积分,为了提高精度,文中提出了一种改进的数字积分算法,有效提高了积分精度。结果表明,该系统在0～1 A范围内误差最大不超过0.21%。

An on-line monitoring method of board card current is presented,and a conveniently retractable coil which comprises two coils is designed as the current sensor. The two coils have the same frame structure and size,but have different number of turns. The coil with less turns is used to measure large current,and the coil with more turns is used to measure weak current. By cooperation of the two coils,accurate measurement of the current can be achieved in large dynamic range. In order to improve the measurement accuracy,an improved digital integration algorithm is proposed. The results show that the error of this system is not more than 0.7% in the current range from 0 A to 1 A,and not more than 0.21% in the current range from 1 A to 100 A.