【应用】单芯片四路运放SGM8044助力新故障指示器电场信号采集
新一代配电线路故障指示器要求依托高性能小电流自取电技术,高精度电子式电路互感器技术及低功耗的微功率无线通讯技术,通过对线路电流的高精度测量及高速录波,结合大数据的融合分析,从而准确判断线路短路及各种类型接地故障,快速定位故障区段,提高供电可靠性。
本方案针对上面的需求设计的故障指示器的原理框图如下 :
其中对于电场信号的采集,由于信号微弱需要增加运放保证采集的结果,超级电容和电池电压的采集也需要经过运放后再采集,圣邦微的SGM8044YTQ16G/TR单芯片四路运放可以很好的解决此问题。
SGM8044四运算放大器系列集四运放于一体,静态功耗(Iq)低至670nA,整体功耗低于2.5uA,增益带宽积(GBP)可至15KHz,SGM8044可支持单电源供电,供电电压最低仅1.4V,其高性能,低功耗的特点非常适用电池供电的产品要求,因此广泛适用于采用电池供电的低电压系统。SGM8044系列提供三种封装分别是SOIC-14,TSSOP-14和TQFN-3×3-16L可根据实际需求选择,在此应用中我们 选用了TQFN-3×3-16L这种封装,是3mm*3mm的小封装。节省了PCB板的面积 。
下面是SGM8044典型应用电路:
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