Development of the Intelligent Charger with Embedded Battery Diagnosis Function Using Online Impedance Spectroscopy

온라인 임피던스 분광법을 이용한 배터리 진단기능을 갖춘 지능형 충전기의 개발

In this research, a novel battery charge system with embedded diagnosis function is proposed by using online impedance spectroscopy. The impedance spectroscopy technique is employed to investigate the impedance variation of the battery thereby estimating the state of health of the battery. A small voltage perturbation is applied to the battery by the voltage controller of the bidirectional converter with no additional hardware and the impedance of the battery is then calculated by the digital lock-in amplifier embedded in the DSP of the charger. The design procedure of the proposed charger is detailed and the feasibility of the system is verified by the experiments.