Three‐level boost converter with zero voltage transition

Soft‐switching non‐isolated high step‐up three‐level boost converter using single magnetic element

“…From the component count point of view, the proposed converter needs relatively fewer elements, however, converters [14,15,18] utilize a large number of components and have a complex structure. Also, converters [6,10,20] are made up of fewer elements, but their voltage gain is low, and [6] suffers from a very high switch voltage stress and reverse recovery losses. Looking at the switch voltage stress, it can be seen that the proposed converter endures the lowest voltage stress across its switches, while, converters [6,8,9,13,16] face a considerably high switch voltage stress.…”

“…Looking at the switch voltage stress, it can be seen that the proposed converter endures the lowest voltage stress across its switches, while, converters [6,8,9,13,16] face a considerably high switch voltage stress. With a closer look at [10], though it has a fewer number of elements and a switch voltage stress equal to the proposed converter, it requires two magnetic cores, has a very low voltage gain, and suffers from reverse recovery losses. In terms of the converter cost, it can be observed that the proposed converter is cheaper than its counterparts.…”

“…The schematic of the conventional three-level boost converter is presented in Figure 2. The voltage stress is halved over each switch, enabling the usage of MOSFETs with lower drain-to-source on-resistance (R ds(on) ) and lower [10] conduction loss of the converter. Another two-switch structure based on a boost converter is interleaved boost using two switches and two extra input inductors.…”

“…To improve the efficiency of DC-DC converters and reduce switching losses, different soft-switching methods are introduced including lossless snubbers [17][18][19], active clamp circuits [20][21][22][23], zero voltage/zero current transition (ZVT/ZCT) methods [10,[13][14][15] and resonant converters [24,25]. Among these methods, ZVT converters benefit from load-independent soft-switching condition.…”

“…By using ZVT cells, load‐independent soft‐switching condition is achieved in [10] for the conventional three‐level boost converter (Figure 2) and its conventional interleaved counterpart in [6], which both have a voltage gain equal to the conventional boost converter. In the ZVT interleaved converter in [14], the voltage gain is improved by employing coupled inductors.…”