Abstract
DC-DC boost converters are necessary to extract power from solar panels. The output voltage from these panels is far lower than the utility voltage levels. One of the main functions of the boost converter is to provide a considerable step-up gain to interface the panel to the utility lines. There are several techniques used to boost the low panel voltage. Some of the issues faced by these topologies are a high duty ratio operation, complex design with multiple active switches and discontinuous input current that affects the power drawn from the panel. This paper presents a boost converter topology that combines the advantages of an interleaved structure, a voltage lift capacitor and a passive voltage multiplier network. A mathematical analysis of the proposed converter during its various modes of operation is presented. A 100 W prototype of the proposed converter is designed and tested. The prototype is controlled by a PIC16F18455 microcontroller. The converter is capable of achieving a gain of 10 without operating at extremely high duty ratios. The voltage stress of the switch is far lower than the maximum output voltage.
Highlights
There is a shift in energy consumption and generation trends globally
Of the various types of renewable energy sources available, solar energy is the solution of choice for the electrification of rural areas or remote areas with little access to grid power
The interleaved input stage consists of the active elements that are controlled to vary the output voltage and the passive voltage multiplier cell that adds to the gain of the interleaved stage
Summary
There is a shift in energy consumption and generation trends globally. Many countries are moving away from fossil-fuel-based energy sources to renewable energy sources [1,2]. The most basic converter topology, the classic boost converter, provides an output voltage greater than its input voltage as a function of its duty cycle [8,9,10]. Interleaved hybrid converters use an interleaved input structure in addition to another gain stage This stage is usually a coupled inductor/switched capacitor network. [36] presents an interleaved hybrid boost converter with an asymmetric structure This topology ensures reduced input current and output voltage ripples while providing. The output is filtered through an output diode and capacitor before being fed to the load This converter offers a high gain at relatively low duty cycles, continuous input current and low peak overshoot. The details of the converter topology, its various modes of operation, an analysis of the proposed converter and the results of testing the prototype are discussed
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