Abstract
The decrease in iron loss in a DC-DC converter is one of the most important issues for energy apparatuses. To reduce the iron loss under the magnetic hysteresis B-H curve caused by the current ripples in the reactor core built in the DC-DC converter, where B and H are the magnetic flux density and magnetic field intensity, respectively, we apply a numerical calculation method based on a suitable magnetic hysteresis model using the play model. When the operating current (corresponding to the magnetic field), on the reactor core is constant, there are two points of magnetic flux density in the B-H curve because of the nonlinear magnetic characteristics, the higher magnetic flux density and lower magnetic flux density. At the higher B and lower B operating points, minor loops appear in the B-H curve when the operating current on the reactor core is varied and has ripples. The calculation results for all three cases show that the performance of the higher B operating point is significantly better than that of the lower B operating point. In particular, a higher B operating point has lower iron loss, smaller magnetic flux density ripples, and larger energy density of the magnetic field caused by the smaller minor loop.
