Current sharing in parallel connected boost converters

MR Geetha, RSM Malar, T Ahilan - The journal of engineering, 2016 - Wiley Online Library
The journal of engineering, 2016Wiley Online Library
Parallel connection of converter modules results in generation of higher output current.
Improper current sharing takes place if parameters of two converter modules are different.
This study proposes a new current‐sharing scheme for parallel connected boost converters.
This current‐sharing scheme control converter output by proper selection of transistor switch
current. In this case, converter duty ratio is not adjusted directly. The adjustment of converter
duty ratio depends on inductor current, capacitor voltage and power input voltage of …
Parallel connection of converter modules results in generation of higher output current. Improper current sharing takes place if parameters of two converter modules are different. This study proposes a new current‐sharing scheme for parallel connected boost converters. This current‐sharing scheme control converter output by proper selection of transistor switch current. In this case, converter duty ratio is not adjusted directly. The adjustment of converter duty ratio depends on inductor current, capacitor voltage and power input voltage of converter. Stability of the proposed current‐sharing scheme is increased by adding artificial ramp to transistor switch current. The effects of adding artificial ramp are analysed and discussed. The proposed current‐sharing scheme is compared with existing current‐sharing scheme whose converter output is regulated by direct choice of duty ratio. The proposed system is implemented in real time using PIC16F877A. Simulation and experimental results verify the effectiveness of the proposed current‐sharing scheme.
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