A modulated interface for a low-cost current sensor in comparison with its simulated model

Simulation tools like Matlab/SIMULINK, PSpice, Multisim. etc, don´t simulate the practical behavior of measurement devices and only deal with ideal characteristics. The problem of ideal current sensor is the accuracy of the calculated value. The simulated value has a high accuracy, which depends on of the processor. For example, a 32bit processor achieves an accuracy of 1/32bit =2,328.10-10. This will not be realizable in metrology, which will produce a mismatch between simulation results and experimental results. Therefore, a more realistic simulation model of a current sensor is required to express the significant meaning of the simulation results. Different disturbances such as, the offset (depends on temperature), the non linearity and the noise influence on the accuracy of a practical current sensor. The implemented simulation model includes these typical influences that gives the simulated value a more realistic view and provides more accurate information about the simulation results. The novel modulation method and therefore the current sensor, results for current control units a high performance. An AD-Converter is not more necessary for signal conversion. The measurement current is directly coded in a “digital current value”, which can be decoded and used for the control unit.