Abstract
A modified step-down converter is presented herein, which is mainly based on one coupled inductor and several energy-transferring capacitors to improve the voltage conversion ratio as well as to reduce the switch voltage stress. In addition, the portion of the leakage inductance energy can be recycled to the input via the active clamp circuit during the turn-off period and the switches have zero-voltage switching (ZVS) during the turn-on transient. In this paper, the basic operating principles of the proposed converter are firstly described and analyzed, and its effectiveness is finally demonstrated by experiment based on a prototype with input voltage of 60 V, output voltage of 3.3 V and rated output power of 33 W.
Highlights
With the fast development of the servo power and the cloud, the converter with a high step-down voltage conversion ratio is indispensable
In the literatures [17,18,19], via changing the turns ratios of coupling inductors, the voltage stresses on switches can be reduced and relatively high step-down voltage conversion ratios can be achieved
As soon order to verify that the voltage conversion ratio of the proposed circuit is wider than that of the circuit as the system get started, the counting value of one counter will be increased from zero to 999, and shown in [24], the former has an input voltage of 60 V and an output voltage of 3.3 V, whereas the be initialized such that the cycle is to be repeated
Summary
With the fast development of the servo power and the cloud, the converter with a high step-down voltage conversion ratio is indispensable. In the literatures [17,18,19], via changing the turns ratios of coupling inductors, the voltage stresses on switches can be reduced and relatively high step-down voltage conversion ratios can be achieved. The literatures [21,22,23,24] apply coupling inductors and energy-transferring capacitors to SR buck converters to improve the step-down voltage conversion ratio, and besides, the last employs an active clamp circuit to reduce the switch voltage stress. Energies 2019, 12, 3896; doi:10.3390/en12203896 www.mdpi.com/journal/energies advantages, such as improvement of core size utilization, reduction of output current ripple, etc Both have the same voltage conversion ratio. The literature [26] utilizes multiple voltage-bucking modules and energy-transferring capacitors to improve the step-down voltage conversion ratio as well as to reduce the voltage stresses on switches
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