数字化直流电流互感器二次激励电源研究

Research of digital direct current transducer’s secondary incentive power

为了提高直流电流互感器的测量精度,研究出一种能根据采样电流大小调整激励电源输出电压的交流稳压电源系统。该系统以TMS320LF2407型DSP为核心,采用DSP技术和步进电机控制技术实现高精度直流电流互感器二次激励电源设计,采用小信号直流电流传感器及A/D转换电路解决二次激励电源的非线性补偿问题。实验结果表明:该系统输出交流电压幅度稳定度可达0.5%,完全满足直流电流互感器实际使用要求。

In order to improve measuring accuracy of the direct current transformer,we studied a type of AC voltage-stabilized power supply system that adjusts the output voltage of the incentive power according to the size of the sampling electric current.This system took the TMS320LF240 DSP as the core,completed the high accuracy direct current transformer seeondary incentive power supply＇s design using the DSP technology and stepper motor control technology, simultaneously realized non-linear compensation of the second excitation power using the small signal direct current sensor and AfD switching circuit.The experimental results show that the system stability of the output AC voltage amplitude up to 0.5%, which fully meets the actual use requirements of DC transducer.