A demonstration of filter inductor design for boost converters, design of the coupled inductor for a two-output forward converter, and the design of flyback transformer in continuous conduction mode. The filter inductor in the converter circuit is operated in a small B-H loop region as compared to the wide region for the conventional transformer. The area of B-H loop is proportional to the total current ripple in the inductor. The core losses are negligible, according to the minor B-H loop area. On the other hand, copper loss depends on the DC current flowing through inductor. The same curve is also applicable in the case of coupled inductor. Design is majorly constrained by the copper loss and the saturation condition of the filter inductor. Figure 1. B-H Loop for Filter Inductor Figure 2. B-H loop for the Conventional Transformer Design of an Inductor for Boost Converter The circuit diagram of the boost converter with related waveform under CCM: Figure 3. Circuit of Boost Converter The basic constraints for the design of an inductor are (a) keep the flux density B below the flux density at the saturation B SAT (b) keep the temperature of the inductor within limit. We also want the inductor current ripples to be equal to the ∈ part of the inductor current.(Ripples in the Inductor
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