Analysis and implementation of a boost DC–DC converter with high voltage gain and continuous input current

Abstract

In this study, a new high-voltage gain DC-DC converter based on the coupled inductor and voltage lift circuit technique is proposed. In the suggested converter, a high-voltage conversion ratio is achieved using a low turn's ratio of the coupled inductor which decreases the volume of core. Also, by selecting the low number of turn's ratio of coupled inductors, the peak voltage through the semiconductors is decreased subsequently. Moreover, the voltage lift circuit is utilised for further increasing the voltage gain and clamping the voltage spike through the main power switch. Zero current switching condition of diodes is another merit of the proposed DC-DC converter, which leads to decrease in the reverse recovery losses generated by diodes. Therefore, the overall efficiency can be enhanced. Technical analysis and comparison surveys with similar topologies are provided to demonstrate the effectiveness of the suggested DC-DC converter. Finally, to validate the performance of the proposed structure, a laboratory prototype with a 200 W power level and 25 kHz operating frequency is implemented.

Non‐isolated DC–DC converter with a high‐voltage conversion ratio

“…Therefore, the control of these converters is complex compared to the proposed topology. The introduced converters in [3, 7] have low‐voltage gain and high‐voltage stress across the switch compared to the recommended structure. Moreover, there is no soft‐switching condition in [3, 23].…”

“…Moreover, there is no soft‐switching condition in [3, 23]. Besides, the number of components in the converter [3, 7] is high with low efficiency in comparison to the suggested converter. According to Table 2, the peak voltage through the diode and active switch in [18] is very high and the voltage conversion ratio is low compared to the proposed converter.…”

“…These converters are complex and use a large number of components [6]. There are some isolated converters based on the high‐frequency transformer and coupled inductor which can provide low‐ and high‐voltage conversion ratio [7]. The main drawback of these converters is the complexity and high cost.…”

A high efficiency soft‐switched DC–DC converter with high voltage conversion ratio

“…4 Generally, DC-DC structures should be applied in renewable power resources by regarding some parameters like voltage gain, efficiency, converter volume, and size and input current ripple. [5][6][7] The conventional boost converter can't use in the high voltage gain because of high losses by its filter capacitors, inductor, diode, and switches. [8][9][10] On the other hand, the extreme rise of the duty cycle leads to appearance losses such as diode revere recovery loss.…”

A topology of coupled inductor DC–DC converter with large conversion ratio and reduced voltage stress on semiconductors

“…By applying the coupled inductor (CL) in DC–DC converters and adjusting turn ratio, the conversion ratio can be increased significantly [9–12]. However, in the coupled inductor‐based converters, the remained energy in the leakage inductance of the coupled inductor should be recovered otherwise, this causes severe voltage spikes.…”