The last few years, a considerable number of studies have been made on a digital control. One reason is that this technique will lead to a nature energy management and system integration. At a first step, it may be helpful to begin with a study of the design criterion of the digital control. Although studies have been made on 1he digital unique characteristics, there is little agreement on the total design criterion. This paper presents a digital criterion for the forward type multiple-output dc-dc converter. In this case, the central problem of design criterion is the relationship between the digital control parameter and the number of bits of the calculation part of the digital control circuit.
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