Abstract
Many of the High Gain Step-Up DC/DC converters proposed in the literature do not share common ground and have a pulsating or discontinuous input current, making the converter unsuitable for solar photovoltaic applications. In this article, a non-pulsating input current (NPIC) with a high-gain DC/DC step-up converter is proposed and analyzed in detail. The converter shares a common ground structure and a voltage conversion ratio more than twice that of the Traditional quadratic boost converter (TQBC). The converter has two switches that operate in phase, which makes it easy to control. Also, the voltage stress across all semiconductor devices is lower than the output voltage, which enhances the efficiency of the converter. The loss analysis is carried out with the PLECS software, integrating the real models of switches and diodes from the technical datasheet. To confirm and validate the functionality of the proposed converter, a 200 W hardware prototype is being developed in the laboratory. It was observed that the maximum efficiency was 94.5% with an input voltage of 16V. The converter achieves high gain at low duty cycles and has been shown to perform well in open loop conditions.
Highlights
The voltage produced at the output of many distributed generation (DG) sources such as solar photovoltaic (PV) systems, batteries, and fuel cells is low and needs to be increased to higher levels for practical applications
High-gain converters are advantageous over traditional boost converters (TBC) and their variants [1] because they are operated at much lower duty ratios to achieve the same voltage gain
HARDWARE RESULTS OF THE non-pulsating input current (NPIC) CONVERTER To validate the performance of the NPIC converter, a 200W hardware model is built with the specifications defined in electromagnetic interference (EMI)
Summary
The voltage produced at the output of many distributed generation (DG) sources such as solar photovoltaic (PV) systems, batteries, and fuel cells is low and needs to be increased to higher levels for practical applications. The proposed converter has a common connection between the input source and the output loads. A clamped structure is proposed in [24] which is used with an interleaved converter to enhance the voltage conversion ratio but the common connection between output and input is lost. The proposed converter is advantageous over these converters with low voltage stress on the output power diode. Knowledge of the need for a higher voltage gain, a low voltage stress on semiconductor components, a nonpulsating nature of the input current, and a common ground structure. The inductor L1 is always attached to the input source Vin, which contributes to the NPIC nature of the proposed converter This is useful in reducing the current stress on the input dc source. Expressed using equation (7) where d is the duty cycle
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