Abstract
Here, a soft switched three-level boost converter with high voltage gain is proposed which is suitable for high step-up applications with wide output power range. In this converter, a ZVT auxiliary circuit is used which provides soft switching in a wide range of output power independent of load variation. Utilizing coupled-inductors with one magnetic core removes extra auxiliary core in the soft switching circuit and provides high voltage gain in conjunction with size reduction. Also, the secondary and tertiary leakage inductances of the coupled-inductors minimize the reverse recovery problem of the output diodes. Due to its three-level structure, it has very low voltage stress over semiconductor elements in comparison to the existing interleaved structures, resulting in using MOSFETs with low on-resistance and thus lower conduction losses and cost. Operating modes as well as analytical analysis of the proposed converter are discussed. Finally, in order to validate the proposed converter performance, experimental results from a 200-W laboratory prototype are presented.
Highlights
Nowadays, global warming and its impact on environment are turned into a major concern for human beings
Other applications of high stepup DC–DC converters are fuel cells, batteries, ultra-capacitors used in motor drives, uninterruptible power supplies (UPS), and electric vehicles (EV) [3,4,5]
The voltage gain provided by Equation (29) is sufficiently high that the proposed converter can be used in high step-up applications even without high turns-ratio of the coupled inductors
Summary
Global warming and its impact on environment are turned into a major concern for human beings. The only three-level boost converter which is proposed based on ZVT soft-switching structure is the converter in [10] and as mentioned earlier it has voltage gain equal to the conventional boost converter and cannot be used for high step-up applications. A new soft-switching three-level boost converter for high voltage gain applications is proposed, which can provide soft-switching conditions in a wide range of output power, independent of load variations for all semiconductor elements. ∙ Very low voltage stress across semiconductor elements ∙ ZVS soft switching condition for the main and auxiliary switch ∙ Using coupled inductor and switched capacitor to increase the voltage conversion ratio ∙ Recycling the leakage inductance energy to the output ∙ Using only a single magnetic core and reduced size and volume ∙ Alleviating the reverse recovery losses of the output diodes and efficiency improvement. Experimental results of the implemented laboratory prototype and conclusion are provided in Sections 4 and 5, respectively
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