Interleaved Buck Converter with Coupled Inductors as Auxiliary Bias-Current Source for Controllable Magnetic Devices

Abstract:
This paper presents an Interleaved Buck Converter with Coupled Inductors as a DC-Bias Current Source for Controllable Magnetic Devices, the modular interleaved Buck system supplies a low-ripple current for the auxiliary DC-bias winding of a controllable inductor with different biasing winding disposition in relationship with the main operating flux of the inductor. A 4-phase interleaved Buck converter system was built and inductance measurements where made for different operating current values of the DC-bias and the main operating currents; the system is integrated by 2-phase modules of magnetically coupled interleaved Buck converters, showing the modularity and scalability of the proposed DC-bias source. Experimental results show that similar results are obtained with the proposed system in comparison with a DC voltage source in series with a large inductance; although at a lower volume and weight.