Abstract
This paper presents comparison between phase-shift full-bridge converters with noncoupled and coupled current-doubler rectifier. In high current capability and high step-down voltage conversion, a phase-shift full-bridge converter with a conventional current-doubler rectifier has the common limitations of extremely low duty ratio and high component stresses. To overcome these limitations, a phase-shift full-bridge converter with a noncoupled current-doubler rectifier (NCDR) or a coupled current-doubler rectifier (CCDR) is, respectively, proposed and implemented. In this study, performance analysis and efficiency obtained from a 500 W phase-shift full-bridge converter with two improved current-doubler rectifiers are presented and compared. From their prototypes, experimental results have verified that the phase-shift full-bridge converter with NCDR has optimal duty ratio, lower component stresses, and output current ripple. In component count and efficiency comparison, CCDR has fewer components and higher efficiency at full load condition. For small size and high efficiency requirements, CCDR is relatively suitable for high step-down voltage and high efficiency applications.
Highlights
To achieve low output voltage, high output current, and high efficiency, a phase-shift full-bridge converter with conventional current-doubler rectifier is widely used in mediumhigh power condition, as shown in Figure 2 [3]
To objectively judge the merits and demerits of noncoupled current-doubler rectifier (NCDR) and coupled current-doubler rectifier (CCDR), their performances are compared as summarized in Table 1 and Figure 12, assuming that the two improved current-doubler rectifiers can be operated with identical frequency, the same input and output voltages, and load currents
The reason behind is that NCDR is used with four inductors resulting in low conversion efficiency
Summary
To achieve low output voltage, high output current, and high efficiency, a phase-shift full-bridge converter with conventional current-doubler rectifier is widely used in mediumhigh power condition, as shown in Figure 2 [3] To release the above-mentioned limitations of the conventional full-bridge converter with current-doubler, many approaches have been conducted [3,4,5,6,7] Their high step-down voltage ratio still result in extremely low duty ratio, which will induce high peak current through the secondary winding of the isolation transformer and output filter inductors, increasing copper loss and component stresses [8,9,10,11,12]. To solve the above-mentioned problem, the phase-shift full-bridge converter with NCDR or CCDR is proposed, The Scientific World Journal
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