Enlarged circuit that draws of difference mode signal

The utility model provides the utility model discloses a carry out measuring enlarged circuit that draws of difference mode signal to the electrical power generating system electric quantity. Under the measurement condition that meets high common mode small -signal, for satisfying the requirement of high accuracy current measurement, through locate to implement the differential mode weight that the enlarged mode of near -end increases the signal to double -terminal signal at the sampling point, acquire high common mode small -signal, reach the requirement of precision measurement, the auxiliary electrical power source that this design comprises the stabilivolt, OP07 operational amplifier, divider resistance, the input feedback resistance constitute, the stabilivolt realizes as auxiliary electrical power source that the near -end enlargies, can the very wide sample voltage of adaptation, it puts the temperature and floats with to lack of proper care influence and the consumption brought little to adopt the ope