A novel hybrid DC comparator

A novel hybrid comparator centered on the configuration of a controllable saturation reactor (CSR) is described. The proposed comparator include four windings (i. e. detection winding, primary winding, secondary winding and excitation winding), a single toroidal core, AC voltage excitation source, detection processing unit, feedback loop and peripheral circuits. The terminal voltage from the detection winding is asymmetric waveform when the CSR is stimulated both by AC source and DC biasing magnetic potential. The differential RMS of half waves of the terminal voltage is adopted as feedback variance to balance DC biasing magnetic potential forming a self-balancing control model. The control principle and output characteristics of the novel comparator are analyzed. The simulation model of the comparator based on the SIMULINK environment of MATLAB software is presented. Experimental results can verify the truth of the proposed comparator model, which has such features as simple construction, single core, easy operation, high sensitivity and satisfactory output characteristic without false-balance points.