A Fluxgate-Based Current Sensor for DC Bias Elimination in a Dual Active Bridge Converter
Guanqun Qiu, Li Ran, Hao Feng, Huaping Jiang, Teng Long, Andrew J. Forsyth, Weihua Shao, Xu Hou
Abstract
A concern with the isolation transformer in a dual active bridge (DAB) dc–dc converter is the dc bias in magnetization. This article 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 article presents the working principle and design considerations. A prototype is demonstrated for dc bias elimination control in a DAB converter.
Topics & Concepts
DC biasCurrent sensorGalvanic isolationForward converterElectrical engineeringFlyback converterDC motorWheatstone bridgeElectronic engineeringTransformerEngineeringDirect currentCurrent (fluid)Fluxgate compassComputer sciencePhysicsBoost converterVoltageMagnetic fieldMagnetometerResistorQuantum mechanicsAdvanced DC-DC ConvertersMagnetic Field Sensors TechniquesPlasma Diagnostics and Applications