Design of Parallel-Operated SEPIC Converters Using Coupled Inductor for Load-Sharing

Venkatanarayanan Subramanian; Saravanan Manimaran

Design of Parallel-Operated SEPIC Converters Using Coupled Inductor for Load-Sharing

Venkatanarayanan Subramanian

Saravanan Manimaran

Vol. 15, No. 2, pp. 327-337, Mar. 2015

10.6113/JPE.2015.15.2.327

Converter

Coupled

Parallel

Pulse width modulation

Ripple

Single-ended Primary-inductor Converter

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Abstract

This study discusses the design of a parallel-operated DC-DC single-ended primary-inductor converter (SEPIC) for low-voltageapplication and current sharing with a constant output voltage. A coupled inductor is used for parallel-connected SEPIC topology. Generally, two separate inductors require different ripple currents, but a coupled inductor has the advantage of using the same ripplecurrent. Furthermore, tightly coupled inductors require only half of the ripple current that separate inductors use. In this proposedwork, tightly coupled inductors are used. These produce an output that is more efficient than that from separate inductors. TwoSEPICs are also connected in parallel using the coupled inductors with a single common controller. An analog control circuit isdesigned to generate pulse width modulation (PWM) signals and to fulfill the closed-loop control function. A stable outputcurrent-sharing strategy is proposed in this system. An experimental setup is developed for a 18.5 V, 60 W parallel SEPIC (PSEPIC)converter, and the results are verified. Results indicate that the PSEPIC provides good response for the variation of input voltage andsudden change in load.

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Cite this article

[IEEE Style]

V. Subramanian and S. Manimaran, "Design of Parallel-Operated SEPIC Converters Using Coupled Inductor for Load-Sharing," Journal of Power Electronics, vol. 15, no. 2, pp. 327-337, 2015. DOI: 10.6113/JPE.2015.15.2.327.

[ACM Style]

Venkatanarayanan Subramanian and Saravanan Manimaran. 2015. Design of Parallel-Operated SEPIC Converters Using Coupled Inductor for Load-Sharing. Journal of Power Electronics, 15, 2, (2015), 327-337. DOI: 10.6113/JPE.2015.15.2.327.