Abstract
This study proposes an input-voltage-sharing control scheme for use in input-series-output-series (ISOS) systems. An ISOS system consists of a set of closed-loop DC/DC converters. Each converter has a metal-oxide-semiconductor field-effect transistor (MOSFET) connected in parallel on the input side that is controlled by an input-voltage-sharing loop. The MOSFET works in the linear region to adjust the input power equilibrium. The proposed control scheme makes the closed-loop converters function as power devices that can be combined quickly and flexibly according to the specific voltage conversion requirements, which greatly shortens the time required to develop an ISOS system. The design principle of the input-voltage-sharing loop and the time and frequency domain simulation results are also provided in this study. A 600 W prototype composed of two DC/DC converters was built and employed to verify the steady state and dynamic characteristics of the proposed control scheme.
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