Abstract

AbstractThe conventional forward‐type multiple‐output dc‐dc converter has a deficiency in that when the output load current drops below a certain value, and the reactor current becomes discontinuous, or when the load changes dynamically, the cross‐regulation function is lost.The authors previously proposed a means to improve the steady‐state characteristics via a forward‐type multiple output converter in which magnetic couplings of windings in the transformer and reactor are utilized.In this paper, the improved forward‐type multiple‐output converter was studied including analysis of its dynamic characteristics. First, the steady‐state characteristic was analyzed. Second, the dynamic characteristic was disclosed in which it was shown that, due to the magnetic coupling between reactor windings and P‐D feedback control, a dynamic cross‐regulation function was obtained and even when the smoothing capacitors are relatively small, the variations of output voltages on load change are well suppressed. Further, comparisons were made with the conventional forward‐type multiple‐output converter and the superiority of the improved circuit was clearly shown.

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