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access icon free Comprehensive sharing control strategy for input-series output-parallel connected modular DC–DC converters

© The Institution of Engineering and Technology
Received 11/01/2019, Accepted 28/06/2019, Revised 17/05/2019, Published 02/07/2019

The systems consisting of multiple DC–DC converters with input-series output-parallel (ISOP) connection are widely used in high-power applications. In the ISOP connection, the total input voltage and output current should be divided equally between the converters. However, in order to achieve this purpose, a proper control scheme should be used. This study proposes two control schemes: (i) output current feedback (OCF) and (ii) input voltage feedback (IVF). Based on the power balance, in the IVF scheme, the total output current, and in the OCF scheme, the total input voltage are divided automatically between the converters, and there is no need to use an extra control loop. The IVF and the OCF control schemes consist of two control loops: a common output voltage regulator (OVR) loop and individual input voltage sharing loops in the IVF scheme or individual output current sharing loops in the OCF scheme. The proposed control scheme can effectively improve the stability and dynamic characteristics of system. Finally, both the results of the simulation and laboratory prototype of an ISOP system consisting two forward converters have verified the performance of the IVF and OCF control schemes.

Inspec keywords: voltage control; DC-DC power convertors; electric current control; voltage regulators; feedback

Other keywords: common output voltage regulator loop; OCF scheme; proper control scheme; extra control loop; ISOP connection; multiple DC–DC converters; total output current; ISOP system; input-series output-parallel connection; individual output; high-power applications; OCF control schemes; comprehensive sharing control strategy; current sharing loops; forward converters; input-series output-parallel connected modular DC–DC converters; individual input voltage; total input voltage; control loops; IVF scheme

Subjects: Power electronics, supply and supervisory circuits; DC-DC power convertors; Voltage control; Power convertors and power supplies to apparatus; Control of electric power systems; Current control

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