Improvement of the dynamic characteristics in multiple-output dc-dc converter by using the magnetic coupling of the energy-storage reactor

The dynamic cross regulation characteristics of the improved forward-type multiple-output converter is examined and compared with that of the conventional one. In the conventional forward-type multiple-output converter, the regulation performance of the cross regulated output voltages is deteriorated by the dynamic change of the load even when the proportional gain of the feedback controller is sufficiently large. On the other hand, in the improved converter, the dynamic cross regulation performance is ameliorated along with the increase in the proportional gain. Further, it can be improved more satisfactorily by using the appropriate P-D control. In this case, the magnetic coupling of the energy-storage reactor plays a key role in the dynamic cross regulation. That mechanism is clarified theoretically through the equivalent circuit models.