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Electrically interconnected suspension (EIS) has recently emerged for vehicle vibration control. It utilises direct current (DC) motors and electrical networks (EN) to achieve the interconnection of multiple independent suspensions. This innovative EIS system can decouple heave and roll motions, enabling independent vibration control with corresponding EN resistance adjustments. The continuity and accuracy of the resistance adjustments directly influence the vibration control performance of EIS. In this paper, a novel closed-loop current control unit (CCU) is introduced and designed specifically for the EIS system to adjust the EN resistance continuously and accurately, corresponding to the damping variation method in the previous EIS system, thereby achieving high-performance semi-active vibration control. The CCU employs a pair of high-frequency Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs …