A study of hybrid Electromagnetic comparator

Traditional controllable saturation reactor (CSR) consists of single toroidal core, direct current (DC) controlled loop and AC (alternating current) excitation loop. A detection winding and secondary winding are added up to the CSR configuration and form a hybrid eletormagnetic comparator. The excitation current waveform is asymmetric when the CSR core is commonly stimulated both by AC and DC biasing sources, which just is the fundamental characteristic for the proposed comparator. Both theory analysis and experiment verify the feasibility of the differential RMS (root-mean-square) between positive and negative half waves of the terminal voltage from the detection winding fitting for the feedback variance to balance DC biasing magnetic potential and form a self-balancing comparator. Some details of the comparator including the control characteristics both of open-loop and close loop, the satiability judgment criterion, static error property and test scope are introduced.