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A concern with the isolation transformer in a dual active bridge (DAB) DC-DC converter is the DC bias in magnetization. This paper proposes a fluxgate-based current sensor to measure the DC component mixed with a large, high-frequency AC current. Compared with a commercial Hall effect current sensor, the proposed sensor significantly reduces measurement error. This paper presents the working principle and design considerations. A prototype is demonstrated for DC bias elimination control in a DAB converter. 1