Current Sharing Method Based on Optimal Phase Shift Control for Interleaved Three-Phase Half Bridge LLC Converter with Floating Y-Connection

Lin Shi; Bangyin Liu; Shanxu Duan

Current Sharing Method Based on Optimal Phase Shift Control for Interleaved Three-Phase Half Bridge LLC Converter with Floating Y-Connection

Lin Shi

Bangyin Liu

Shanxu Duan

Vol. 19, No. 4, pp. 934-943, Jul. 2019

10.6113/JPE.2019.19.4.934

Current sharing

Interleaved LLC converter

Phase shift control

Three-phase LLC converter

Y-connection

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Abstract

A current balance problem exists in multi-phase LLC converters due to the resonant parameter tolerance. This paper presents a current balancing method for interleaved three-phase half bridge LLC converters. This method regulates the phase shift angle of the driving signals between the three phases based on a converter with a floating Y-connection. The floating midpoint voltage has different influences on each phase current and makes the three-phase current balance performance better than midpoint non-floating systems. Phase shift control between modules can further regulate the midpoint voltage. Then three phase current sharing is realized without adding extra components. The current distributions in a midpoint non-floating system and a midpoint floating system are compared. Then the principle and implementation of the proposed control strategy are analyzed in detail. A 3kW prototype is built to verify the validity and feasibility of the proposed method.

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Cite this article

[IEEE Style]

L. Shi, B. Liu, S. Duan, "Current Sharing Method Based on Optimal Phase Shift Control for Interleaved Three-Phase Half Bridge LLC Converter with Floating Y-Connection," Journal of Power Electronics, vol. 19, no. 4, pp. 934-943, 2019. DOI: 10.6113/JPE.2019.19.4.934.

[ACM Style]

Lin Shi, Bangyin Liu, and Shanxu Duan. 2019. Current Sharing Method Based on Optimal Phase Shift Control for Interleaved Three-Phase Half Bridge LLC Converter with Floating Y-Connection. Journal of Power Electronics, 19, 4, (2019), 934-943. DOI: 10.6113/JPE.2019.19.4.934.