Abstract
In this paper, a new type of interleaved high step-up converter including a coupled inductor is proposed. The proposed converter has an interleaved configuration on the input side to reduce the ripple of the input current and increase the power level. Moreover, a stacked structure on the output side provides a high input/output (I/O) voltage gain. In addition, the proposed converter can avoid an extreme duty cycle, causing larger conduction losses, by combining a coupled inductor and a lossless clamp circuit with an interleaved method. These increase the efficiency by making the semiconductor device a low voltage stress and allowing the use of components with low voltage ratings. Also, the energy stored in the leakage inductor in the coupled inductor can be recycled to the output side, the MOSFETs can be partially ZCS turned ON, and the diode reverse recovery problem can be alleviated. Finally, a laboratory prototype circuit with an input voltage of 24V, an output voltage of 400V and an output of 500W was implemented to demonstrate the performance of the proposed converter.
Highlights
High step-up converters are required in many industries based on renewable energy [1]–[3]
1) The power level and input current ripple are respectively increased and reduced by interleaved operation on the input side, and high voltage gain is obtained by the series stack method on the output side.‘
2) The conduction loss and efficiency are improved by using lower voltage rated MOSFETs and diodes
Summary
High step-up converters are required in many industries based on renewable energy [1]–[3]. The proposed converter can increase the voltage gain by using the stack type method and the turns ratio of the coupled inductor on the output side. A. ANALYSIS OF OPERATION AT 0 < iLkx A total of six main operation analyzes were performed based on the section in which leakage inductor currents are greater than 0 (zero) by D of the proposed converter. The energy stored in Lm2 of L2 charges Ca through Da and C4 through Dd. The energy stored in Lm2 of L2 charges Ca through Da and C4 through Dd In this mode, D2 is ZCS turned ON through a linear increase of iLk1, and the main current of this mode is expressed as iLk1(t) = iLm1(t) + NiD2(t). It is possible to increase the voltage gain by using N
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